1<?xml version='1.0' encoding='UTF-8'?><?xml-stylesheet href="http://www.blogger.com/styles/atom.css" type="text/css"?><feed xmlns='http://www.w3.org/2005/Atom' xmlns:openSearch='http://a9.com/-/spec/opensearchrss/1.0/' xmlns:blogger='http://schemas.google.com/blogger/2008' xmlns:georss='http://www.georss.org/georss' xmlns:gd="http://schemas.google.com/g/2005" xmlns:thr='http://purl.org/syndication/thread/1.0'><id>tag:blogger.com,1999:blog-7750735187888945261</id><updated>2026-04-07T00:19:41.745+01:00</updated><category term="hamradio"/><category term="stm32"/><category term="sdr"/><category term="wspr"/><category term="Antenna"/><category term="arduino"/><category term="4m"/><category term="70Mhz"/><category term="PAC-12"/><category term="meteor"/><category term="qrss"/><category term="stm32f7"/><category term="transverter"/><category term="triggertrap"/><category term="wxsat"/><category term="FreeDV"/><category term="contest"/><category term="datv"/><category term="hackrf"/><category term="hackrf blue"/><category term="hackrfblue"/><category term="homebrew"/><category term="i2phd"/><category term="lf"/><category term="portable"/><category term="receiver"/><category term="vlf"/><title type='text'>Jottings on Amateur Radio</title><subtitle type='html'></subtitle><link rel='http://schemas.google.com/g/2005#feed' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/posts/default'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/'/><link rel='hub' href='http://pubsubhubbub.appspot.com/'/><link rel='next' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default?start-index=26&max-results=25'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><generator version='7.00' uri='http://www.blogger.com'>Blogger</generator><openSearch:totalResults>41</openSearch:totalResults><openSearch:startIndex>1</openSearch:startIndex><openSearch:itemsPerPage>25</openSearch:itemsPerPage><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-6691482662341469384</id><published>2018-05-18T10:19:00.000+01:00</published><updated>2018-07-31T19:44:28.347+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="homebrew"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - decision time</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The video below shows my Homebrew SDR rx working with the GUI on the STM32F746-Discovery board.</span><br /> 2<br /> 3<div class="separator" style="clear: both; text-align: center;"> 4<iframe allowfullscreen="" class="YOUTUBE-iframe-video" data-thumbnail-src="https://i.ytimg.com/vi/2tw62NZTXJI/0.jpg" frameborder="0" height="266" src="https://www.youtube.com/embed/2tw62NZTXJI?feature=player_embedded" width="320"></iframe></div> 5<br /> 6<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">However, what you might notice is the presence of image products in the waterfall. The processing of the signal suppresses all but the very strongest of these so they don't appear as audio but it is mighty confusing when they are on the waterfall but actually not there (if you see what I mean)!</span><br /> 7<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span><span style="font-family: arial, helvetica, sans-serif;">I am in the process of building a QSD or Tayloe Detector, which should provide better rejection of images. I have breadboarded one of these, it works but not very well. I think that this might be due to the length of leads I have on the breadboard so I am trying to use Eagle CAD to design a circuit board to overcome these problems.</span><br /> 8<br /> 9<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/6691482662341469384/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2018/05/homebrew-sdr-hf-transceiver-decision.html#comment-form' title='8 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/6691482662341469384'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/6691482662341469384'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2018/05/homebrew-sdr-hf-transceiver-decision.html' title='Homebrew SDR HF Transceiver - decision time'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
9<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://img.youtube.com/vi/2tw62NZTXJI/default.jpg" height="72" width="72"/><thr:total>8</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-7428954611947461864</id><published>2018-02-26T11:48:00.000+00:00</published><updated>2018-03-31T18:16:25.904+01:00</updated><title type='text'>Homebrew SDR HF Transceiver - DSP Concepts Audio Weaver</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">It's been a little while since my last post but I have been wrestling with software.</span><br /> 10<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 11<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">To summarise, my software stack is:</span><br /> 12<br /> 13<ul> 14<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">FreeRTOS - a real time operating system for microcontrollers that enables an easy way to prioritise tasks without having to resort to 'bare metal' handling of interrupts. FreeRTOS is free with no licence issues.</span></li> 15<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">uGFX - initially I was planning to use STemWin as a graphics manager but, although free to use it is closed source. As I couldn't get it to work with FreeRTOS I decided to use an open source graphics manager and found <a href="https://ugfx.io/">uGFX</a>. This decision has not been without its problems but after I found the bug in the uGFX code I was able to work around it.</span></li> 16<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">DSP Concepts <a href="https://dspconcepts.com/st">Audio Weaver</a>&nbsp;
16- this software is closed source but licenced by ST for use on their microcontrollers. However, as it is fantastic it is worthwhile persevering with. You do have to register to download it but no payment is required.</span></li> 17</ul> 18<div> 19<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">So, to cut a very long story short I now have FreeRTOS, uGFX and Audio Weaver running together. I have taken <a href="https://github.com/etherkit/Si5351Arduino">NT7S</a>'s Si5351 library code that <a href="https://github.com/g7uvw/mbed_si5351">G7UVW</a> had ported to the mbed platform and in turn I have ported it to C to work with the ST hardware abstraction layer.</span></div> 20<div> 21<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 22<div> 23<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I can now tune the Si5351 from the STM32F746-Discovery board using the touch screen while the DSP processing provided by the Audio Weaver library is also running. The one niggle that I have yet to resolve is that when I disconnect &amp; reconnect power from the microcontroller the audio processing doesn't work on reboot although the rest of the program (graphics etc.) does.</span></div> 24<div> 25<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 26<div> 27<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">For now though I'll focus on the design of the signal processing in Audio Weaver.</span></div> 28<div> 29<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 30<div> 31<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Audio Weaver Designer runs on Windows (I've tried it on Linux with Wine but with no success) and is used to design and build the audio processing by joining blocks together. Even better is that it is possible to deploy the process you have designed onto the microcontroller and run it while allowing you to change settings in Windows. This approach leads to a quick development time and tuning is easy. When the design is completed it is a simple operation to create the files required to incorporate them in the microcontroller code.</span></div> 32<div> 33<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 34<div> 35<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">There is an argument that this approach is the easy one but I liken it to the discussion around using an LM386 or NE602 when discrete components could be used. It's a tool and it works so I'll use it.</span></div> 36<div> 37<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 38<div> 39<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The image below shows Audio Weaver Designer:</span></div> 40<div class="separator" style="clear: both; text-align: center;"> 41<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWwmgZj0cuU14aCFo1lbTiY7dZ-Y7UNE5UXo2i3KEq-9eynPnRx-hfFmaiV53l_WWNN3uptjUgvy5aUjF89PWXOyWDrBIRkIj7jt2epeGdDasPwQduOfq11BK6h9wYi3x3rebCTKMdGiA/s1600/sdr1.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="709" data-original-width="1363" height="332" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWwmgZj0cuU14aCFo1lbTiY7dZ-Y7UNE5UXo2i3KEq-9eynPnRx-hfFmaiV53l_WWNN3uptjUgvy5aUjF89PWXOyWDrBIRkIj7jt2epeGdDasPwQduOfq11BK6h9wY
41i3x3rebCTKMdGiA/s640/sdr1.PNG" width="640" /></a></div> 42<div> 43<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 44<div> 45<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The available modules are selected from the folders on the left and dragged into the process and the connectors are then joined together and any parameters added/changed.</span></div> 46<div> 47<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 48<div> 49<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The images below shows annotations against each major functional block of my DSP processing:</span></div> 50<div class="separator" style="clear: both; text-align: center;"> 51<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmubfk4Kl_PLDCtLpHoOtY7tGODgoMcUnHOhqORo6zYV-1QH4vEg635cZnGAgQE-_6JFAT_xczKnU9W3K9Zx0GvIOxd3ZKv-F7oLRJQJp06ndkx1CnUcZCDe01lf_Mq-DYgmnxDHQbuDQ/s1600/layout1+%25281%2529.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="610" data-original-width="882" height="442" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjmubfk4Kl_PLDCtLpHoOtY7tGODgoMcUnHOhqORo6zYV-1QH4vEg635cZnGAgQE-_6JFAT_xczKnU9W3K9Zx0GvIOxd3ZKv-F7oLRJQJp06ndkx1CnUcZCDe01lf_Mq-DYgmnxDHQbuDQ/s640/layout1+%25281%2529.PNG" width="640" /></a></div> 52<br /> 53<div class="separator" style="clear: both; text-align: center;"> 54<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiARz7yH3NP38LpiPimCL2VPVPVDuTzvtxBKkOVCjRN4V8bO6tToDKE833RsLTXUsE3dNMnRPCxFhWEK_B42m4XrotkWOawXdrPYrL2MWt_LuIdoxMebWgT-7QTkpfAc9U9F6uSJkiymG0/s1600/layout2+%25281%2529.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="604" data-original-width="648" height="596" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiARz7yH3NP38LpiPimCL2VPVPVDuTzvtxBKkOVCjRN4V8bO6tToDKE833RsLTXUsE3dNMnRPCxFhWEK_B42m4XrotkWOawXdrPYrL2MWt_LuIdoxMebWgT-7QTkpfAc9U9F6uSJkiymG0/s640/layout2+%25281%2529.PNG" width="640" /></a></div> 55<div> 56<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 57<div> 58<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">This method of SSB demodulation is not the <a href="https://pdfs.semanticscholar.org/f1d3/03957040554142727908fd34188711442ccf.pdf">Weaver</a> (or third) method as I have read elsewhere but a bit of a hybrid. I will be trying other configuration to assess which is best for my application. A good description of the different methods of SSB demodulation is <a href="http://www.panoradio-sdr.de/ssb-demodulation/">here</a>.</span></div> 59<div> 60<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 61<div> 62<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">While testing this process through Audio Weaver Designer I am controlling the Si5351 tuning via an Arduino Uno using the sketch I put in a previous post. The Audio Weaver file in the pictures is available for download <a href="https://drive.google.com/file/d/1yXKeemhNQi-MFJR0QJhZFmq1t8N9Qy9u/view?usp=sharing">here</a> if you want to try it yourself.</span></div> 63<div> 64<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 65<div> 66<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">A video of reception using this process flow while it is running on the Windows machine connected to the microcontroller is below.</span><br /> 67<div class="separator" style="clear: both; text-align: center;"> 68<iframe allowfullscreen="" class="YOUTUBE-iframe-video" data-thumbnail-src="https://i.ytimg.com/vi/f-JGUd4fvls/0.jpg" frameborder="0" height="266" src="https://www.youtube.com/embed/f-JGUd4fvls?feature=player_embedded" width="320"></iframe></div> 69<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 70<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: Bringing it all together on the STM32F746-Discovery board.</span></div> 71<div> 72<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 73</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/7428954611947461864/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2018/02/homebrew-sdr-hf-transceiver-dsp.html#comment-form' title='4 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/7428954611947461864'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/7428954611947461864'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2018/02/homebrew-sdr-hf-transceiver-dsp.html' title='Homebrew SDR HF Transceiver - DSP Concepts Audio Weaver'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
73<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgWwmgZj0cuU14aCFo1lbTiY7dZ-Y7UNE5UXo2i3KEq-9eynPnRx-hfFmaiV53l_WWNN3uptjUgvy5aUjF89PWXOyWDrBIRkIj7jt2epeGdDasPwQduOfq11BK6h9wYi3x3rebCTKMdGiA/s72-c/sdr1.PNG" height="72" width="72"/><thr:total>4</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-891191099037583608</id><published>2017-12-28T17:14:00.001+00:00</published><updated>2018-02-26T11:49:25.002+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - Listening to the receiver in SDR#</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I recorded this <a href="https://youtu.be/ih5fmpvmNdo" target="_blank">video</a> of the I/Q outputs fed into my computer with the demodulation being performed by sdr# (now with audio)</span><br /> 74<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 75<br /> 76<div class="separator" style="clear: both; text-align: center;"> 77<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNQwxtoiiN7hwpGML7PkfwKLYx6W6Y8sDN-vRAd4gjW9NRT9f337jmX3r7-lAYOnHDxhuAEVVnPNcx3Aes5yE6Lnl8pq3L9_uYYfu8pRJq7dgrnK2qlULONW4ANzq838aNFc_20YiTNBs/s1600/Screenshot_2017-12-28_17-11-51.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="713" data-original-width="1600" height="284" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNQwxtoiiN7hwpGML7PkfwKLYx6W6Y8sDN-vRAd4gjW9NRT9f337jmX3r7-lAYOnHDxhuAEVVnPNcx3Aes5yE6Lnl8pq3L9_uYYfu8pRJq7dgrnK2qlULONW4ANzq838aNFc_20YiTNBs/s640/Screenshot_2017-12-28_17-11-51.png" width="640" /></a></div> 78<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 79<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The large central spike is, I think, bleed through from the local oscillator signal.</span><br /> 80<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 81<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">My next task is to measure the loss in the receiver and also look at whether there is a ground loop problem.</span><br /> 82<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 83<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: <a href="http://photohamrad.blogspot.co.uk/2018/02/homebrew-sdr-hf-transceiver-dsp.html">Introduction to the microcontroller processing.</a></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/891191099037583608/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-listening.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/891191099037583608'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/891191099037583608'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-listening.html' title='Homebrew SDR HF Transceiver - Listening to the receiver in SDR#'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
83<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgNQwxtoiiN7hwpGML7PkfwKLYx6W6Y8sDN-vRAd4gjW9NRT9f337jmX3r7-lAYOnHDxhuAEVVnPNcx3Aes5yE6Lnl8pq3L9_uYYfu8pRJq7dgrnK2qlULONW4ANzq838aNFc_20YiTNBs/s72-c/Screenshot_2017-12-28_17-11-51.png" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5202328204775949522</id><published>2017-12-28T16:22:00.001+00:00</published><updated>2018-06-24T20:57:50.716+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - Quadrature Divider</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">We are now at the point where we need to take the signal from the Si5351, divide it by 4 and produce two outputs, one of which is 90 degrees out of phase from the other.</span><br /> 84<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 85<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">A good tutorial on this process is&nbsp;<a href="http://www.electronics-tutorials.ws/counter/count_1.html" target="_blank">here</a>&nbsp;although we will divide by 4 rather than 2. The datasheet for the 74HC74 is <a href="https://assets.nexperia.com/documents/data-sheet/74HC_HCT74.pdf" target="_blank">here</a>. The 74AC74 and 74HC74 are more or less interchangeable, the difference being that one can handle higher frequencies than the other.</span><br /> 86<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 87<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">There are many circuits on the Internet for quadrature dividers but I used one that is used in the SoftRock Ensemble receiver, <a href="http://www.wb5rvz.com/sdr/ensemble/04_div.htm" target="_blank">here</a>. The only difference being that the outputs to QSD CLK0 &amp; CLK1 are not used, however, note that pin 9 does need to be connected to pin 2 (it took me a while to figure that was the reason I couldn't get it to work). Pin 14 is fed with 5V from the 7805 regulator and pin 3 is fed from CLK0 output on the Si5351. The outputs from pin 5 and 8 are individually fed to the LO ports on ADE-1 #1 and ADE-1 #2.</span><br /> 88<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 89<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Below is my version, it looks a bit messy but it works.</span><br /> 90<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 91<br /> 92<div class="separator" style="clear: both; text-align: center;"> 93<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2U38_Q9g8rAqnpHAqVlVVuN2SPegWv1y9_OzMuLXB2ajAQ6vfIHBxGZzOa9iwET3UnvS0agnwL24X58t-UgMbKbdMJ-I9j0R23qVb8k7Yc-HakR7r-WL1Pe0iW27Zs68-8SKBB8n3wkc/s1600/IMG_3595.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1069" data-original-width="1600" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2U38_Q9g8rAqnpHAqVlVVuN2SPegWv1y9_OzMuLXB2ajAQ6vfIHBxGZzOa9iwET3UnvS0agnwL24X58t-UgMbKbdMJ-I9j0R23qVb8k7Yc-HakR7r-WL1Pe0iW27Zs68-8SKBB8n3wkc/s640/IMG_3595.JPG" width="640" /></a></div> 94<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 95<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 96<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The screenshot from my oscilloscope shows the two out of phase outputs from the quadrature divider in yellow and blue. The purple line shows the that these two outputs have been divi
96ded by 4 and are at a frequency of 7.100 MHz.</span><br /> 97<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 98<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 99<br /> 100<div class="separator" style="clear: both; text-align: center;"> 101<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuObSzA_KOVBbY78AdvZtvpL3fRa4oSo9NCxgMwGfyNjMVI9YLXepgyqbBDJ3PTKkytoLbDJgAb1cdp04SFeEIHbuq2r0agrItTvqLBD5l-j6ofucDnu04kbfGSzmepBxcmxFCnu_sXnU/s1600/SDS00020.BMP" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhuObSzA_KOVBbY78AdvZtvpL3fRa4oSo9NCxgMwGfyNjMVI9YLXepgyqbBDJ3PTKkytoLbDJgAb1cdp04SFeEIHbuq2r0agrItTvqLBD5l-j6ofucDnu04kbfGSzmepBxcmxFCnu_sXnU/s640/SDS00020.BMP" width="640" /></a></div> 102<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 103<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 104<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">We are now ready to see what this thing can receive by taking the I &amp; Q outputs from the audio LPF's to a stereo jack plug (I to left channel, Q to right channel or vice versa plus ground) and plugging it into our computer to listen to the signals using SDR# but finally a picture of the completed RF splitter, mixer, AF low pass filter, regulator, quadrature divider board.</span><br /> 105<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 106<br /> 107<div class="separator" style="clear: both; text-align: center;"> 108<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgv4d8r4FNpK35s69HjEm2eHC5h4HSKc9MdAMcZwDfsvsR3ypvbC-lqbcoc432NkDg-Kl916k3wJVtvSk6zAu3w2R9OhyIdG_u4MpZiMFl05bpIT6-8Fj5d8vU7Ook28dz_JAyhMe_TeDM/s1600/IMG_3618.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1069" data-original-width="1600" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgv4d8r4FNpK35s69HjEm2eHC5h4HSKc9MdAMcZwDfsvsR3ypvbC-lqbcoc432NkDg-Kl916k3wJVtvSk6zAu3w2R9OhyIdG_u4MpZiMFl05bpIT6-8Fj5d8vU7Ook28dz_JAyhMe_TeDM/s640/IMG_3618.JPG" width="640" /></a></div> 109<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 110<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I was going to mount the Si5351 breakout board onto the two posts top right but I think the board uses imperial screw size holes as my M3 screws will not quite fit.</span><br /> 111<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 112<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: <a href="https://photohamrad.blogspot.co.uk/2017/12/homebrew-sdr-hf-transceiver-listening.html">Connecting to SDR#</a></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5202328204775949522/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-quadrature.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5202328204775949522'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5202328204775949522'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-quadrature.html' title='Homebrew SDR HF Transceiver - Quadrature Divider'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
112<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj2U38_Q9g8rAqnpHAqVlVVuN2SPegWv1y9_OzMuLXB2ajAQ6vfIHBxGZzOa9iwET3UnvS0agnwL24X58t-UgMbKbdMJ-I9j0R23qVb8k7Yc-HakR7r-WL1Pe0iW27Zs68-8SKBB8n3wkc/s72-c/IMG_3595.JPG" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5125755608166285267</id><published>2017-12-28T15:21:00.001+00:00</published><updated>2017-12-28T16:23:10.434+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - the Si5351</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The Si5351 is <i>"...an I2C configurable clock generator that is ideally suited for replacing 113crystals, crystal oscillators, VCXOs..." </i>That is to say that it can generate frequencies from 2.5 kHz up to 200 MHz. Adafruit Industries produce a <a href="https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout/overview" target="_blank">breakout board</a> with the Si5351 chip and other required components installed for under $8, this allows us to interface with a microcontroller, e.g. Arduino, and control the frequencies produced very easily. The breakout board allows us to generate three frequencies but for this project we will only be using one of the outputs. We will produce a frequency that is four times the LO frequency we require, when the signal goes through the quadrature divider (74AC74 flip-flop) it will be divided by four to produce the LO frequency.</span><br /> 114<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 115<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Adafruit Si5351 breakout board on the left, Arduino Uno on the right.</span><br /> 116<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 117<br /> 118<div class="separator" style="clear: both; text-align: center;"> 119<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYILxMHWivb8O01k5Gk6qDLvaJunrzeclzVS5h4Z_BecOIxx4cdGvSgmpui14i3LGNjOi0V68_UyVCsn82tUaAdDyIooeYg8eiqFoBuCxg-8tJ-3gnVt_Zig4VBJdJtZDd5ijM3oSKnQA/s1600/IMG_3597.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1069" data-original-width="1600" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYILxMHWivb8O01k5Gk6qDLvaJunrzeclzVS5h4Z_BecOIxx4cdGvSgmpui14i3LGNjOi0V68_UyVCsn82tUaAdDyIooeYg8eiqFoBuCxg-8tJ-3gnVt_Zig4VBJdJtZDd5ijM3oSKnQA/s640/IMG_3597.JPG" width="640" /></a></div> 120<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 121<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 122<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The connections are simple:&nbsp;+5V and GND from the 7805 regulator, pin A4 from the Arduino Uno connected to pin SDA on the breakout board and pin A5 connected to pin SCL.&nbsp;</span><br /> 123<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 124<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I have hacked the example program below, it sets the Si5351 to a default frequency of 28.4 MHz, i.e. 7.1 MHz after the divide by 4, and by using the serial monitor window in the Arduino IDE y
124ou can change frequency in 1 kHz steps up (1) or down (2), or 100 Hz steps up (+) or down (-). This frequency is output on CLK0 - the next step is to connect CLK0 to the 74AC74 flip flop.</span><br /> 125<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 126<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">You will need to install&nbsp;the Si5351 library by following the instructions <a href="https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout/wiring-and-test" target="_blank">here</a>.</span><br /> 127<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 128<br /> 129<blockquote class="tr_bq"> 130<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace; font-size: x-small;">/*<br />&nbsp;* si5351example.ino - Simple example of using Si5351Arduino library<br />&nbsp;*<br />&nbsp;* Copyright (C) 2015 Jason Milldrum &lt;[email protected]&gt;<br />&nbsp;*<br />&nbsp;* This program is free software: you can redistribute it and/or modify<br />&nbsp;* it under the terms of the GNU General Public License as published by<br />&nbsp;* the Free Software Foundation, either version 3 of the License, or<br />&nbsp;* (at your option) any later version.<br />&nbsp;*<br />&nbsp;* This program is distributed in the hope that it will be useful,<br />&nbsp;* but WITHOUT ANY WARRANTY; without even the implied warranty of<br />&nbsp;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.&nbsp; See the<br />&nbsp;* GNU General Public License for more details.<br />&nbsp;*<br />&nbsp;* You should have received a copy of the GNU General Public License<br />&nbsp;* along with this program.&nbsp; If not, see &lt;http://www.gnu.org/licenses/&gt;.<br />&nbsp;*/<br /><br />#include "si5351.h"<br />#include "Wire.h"<br />Si5351 si5351;<br />char incoming_char;<br />long serial_input_number, serial_input_number1;<br />void setup()<br />{<br />&nbsp; // Start serial and initialize the Si5351<br />&nbsp; Serial.begin(57600);<br />&nbsp; si5351.init(SI5351_CRYSTAL_LOAD_8PF, 0);<br />&nbsp; // Set CLK0 to output 7.1 MHz with a fixed PLL frequency<br />&nbsp; si5351.set_pll(SI5351_PLL_FIXED, SI5351_PLLA);<br />&nbsp; si5351.set_freq(2840000000ULL, SI5351_PLL_FIXED, SI5351_CLK0);<br />&nbsp; serial_input_number1 = 7100000;<br />}<br />void loop()<br />{<br />&nbsp;if(Serial.available()&gt;0){<br />&nbsp; &nbsp; incoming_char = Serial.read();<br />&nbsp; &nbsp; switch(incoming_char){<br />&nbsp; &nbsp; case '1': //up by 1kHz<br />&nbsp; &nbsp; &nbsp; serial_input_number1 = serial_input_number1 + 1000;<br />&nbsp; &nbsp; &nbsp; serial_input_number = serial_input_number1 * 4;<br />&nbsp; &nbsp; &nbsp; si5351.set_freq((serial_input_number) * 100ULL, SI5351_PLL_FIXED, SI5351_CLK0);<br />&nbsp; &nbsp; &nbsp; Serial.println(serial_input_number1);<br />&nbsp; &nbsp; &nbsp; break;<br />&nbsp; &nbsp; case '2': //down by 1kHz<br />&nbsp; &nbsp; &nbsp; serial_input_number1 = serial_input_number1 - 1000;<br />&nbsp; &nbsp; &nbsp; serial_input_number = serial_input_number1 * 4;<br />&nbsp; &nbsp; &nbsp; si5351.set_freq((serial_input_number) * 100ULL, SI5351_PLL_FIXED, SI5351_CLK0);<br />&nbsp; &nbsp; &nbsp; Serial.println(serial_input_number1);<br />&nbsp; &nbsp; &nbsp; break;<br />&nbsp; &nbsp; &nbsp;case '+': //up by 100Hz<br />&nbsp; &nbsp; &nbsp; serial_input_number1 = serial_input_number1 + 100;<br />&nbsp; &nbsp; &nbsp; serial_input_number = serial_input_number1 * 4;<br />&nbsp; &nbsp; &nbsp; si5351.set_freq((serial_input_number) * 100ULL, SI5351_PLL_FIXED, SI5351_CLK0);<br />&nbsp; &nbsp; &nbsp; Serial.println(serial_input_number1);<br />&nbsp; &nbsp; &nbsp; break;<br />&nbsp; &nbsp; &nbsp;case '-'
130: //down by 100Hz<br />&nbsp; &nbsp; &nbsp; serial_input_number1 = serial_input_number1 - 100;<br />&nbsp; &nbsp; &nbsp; serial_input_number = serial_input_number1 * 4;<br />&nbsp; &nbsp; &nbsp; si5351.set_freq((serial_input_number) * 100ULL, SI5351_PLL_FIXED, SI5351_CLK0);<br />&nbsp; &nbsp; &nbsp; Serial.println(serial_input_number1);<br />&nbsp; &nbsp; &nbsp; break;<br />&nbsp; &nbsp; }<br />&nbsp; &nbsp; Serial.flush();&nbsp; &nbsp; <br />&nbsp; }<br />}</span></blockquote> 131<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">A 7805 regulator circuit used to convert ~12V to 5V is <a href="http://www.instructables.com/id/5v-Regulator/" target="_blank">here</a>.</span><br /> 132<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 133<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">When you run the Arduino sketch you should be able to hear the output from the Si5351 on an HF receiver at 28.4 MHz</span><br /> 134<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 135<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: <a href="https://photohamrad.blogspot.co.uk/2017/12/homebrew-sdr-hf-transceiver-quadrature.html" target="_blank">Quadrature Divider</a></span><br /> 136<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 137</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5125755608166285267/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-si5351.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5125755608166285267'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5125755608166285267'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-si5351.html' title='Homebrew SDR HF Transceiver - the Si5351'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhYILxMHWivb8O01k5Gk6qDLvaJunrzeclzVS5h4Z_BecOIxx4cdGvSgmpui14i3LGNjOi0V68_UyVCsn82tUaAdDyIooeYg8eiqFoBuCxg-8tJ-3gnVt_Zig4VBJdJtZDd5ijM3oSKnQA/s72-c/IMG_3597.JPG" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-2901911502767071851</id><published>2017-12-27T20:31:00.000+00:00</published><updated>2018-06-20T14:12:29.455+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - Adding the ADE-1 Mixers</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The <a href="https://ww2.minicircuits.com/pdfs/ADE-1.pdf" target="_blank">ADE-1</a> is a passive device with an RF and LO input and an IF output. Two ADE-1's are used with the RF port on each being fed with output from port 1 and 2 of the RF splitter respectively (Note: I changed the design of the RF splitter from that which I first published, here is a link to the updated <a href="https://www.blogger.com/blogger.g?blogID=7750735187888945261#editor/target=post;postID=4289254762773531777;onPublishedMenu=allposts;onClosedMenu=allposts;postNum=1;src=postname" target="_blank">page</a>). The LO ports will be fed from one of the two outputs of the 74AC74 flip-flop respectively. The output of the IF ports goes to an audio frequency LPF (one LPF per port).</span><br /> 138<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 139<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The theory behind how the I &amp;
139 Q signals are produced are described in this excellent YouTube <a href="https://www.youtube.com/watch?v=JuuKF1RFvBM&amp;t=1279s" target="_blank">video</a> by Craig, devttyS0. In short the LO outputs are produced by dividing the signal from the Si5351 by 4, there are two outputs from the 74AC74 at the LO frequency and one is 90 degrees out of phase from the other. When each one of these is mixed with the RF in the ADE-1 we end up with two outputs at baseband audio frequency, I &amp; Q, one being 90 degrees out of phase from the other as shown below:</span><br /> 140<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 141<br /> 142<div class="separator" style="clear: both; text-align: center;"> 143<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip-qgHUviVpYz8rNkQaNa1djTgblnbh3eF8Ru10suuASiNI8tPiLBUYrCZm1cgDKWGseEo1VmV2BmY-MeaBK-0yEAdvOhaPG-yGj0rBESc7gSBt3tTbDOV740DAukUyi8U-IAhx6tswQ4/s1600/SDS00024.BMP" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip-qgHUviVpYz8rNkQaNa1djTgblnbh3eF8Ru10suuASiNI8tPiLBUYrCZm1cgDKWGseEo1VmV2BmY-MeaBK-0yEAdvOhaPG-yGj0rBESc7gSBt3tTbDOV740DAukUyi8U-IAhx6tswQ4/s640/SDS00024.BMP" width="640" /></a></div> 144<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 145<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The audio LPF that follows each RF output I copied from <a href="https://ea4nz.ure.es/sdr/sdr.html" target="_blank">EA4NZ</a></span><br /> 146<br /> 147<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 148<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYGcas0jjgNiw2cha2wE9l9VxCc_0v-gt2BQbdG6vh2zY15MVmB8EWgf6H1FR1VpKwSSfTPF5kG9xTnd6zNKhfHUetDersHlPpuw6KX57bXpZq7FOg2nI33iHb71Dt-n4b8hC3MqQXFYQ/s1600/audio-amp.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="357" data-original-width="357" height="320" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjYGcas0jjgNiw2cha2wE9l9VxCc_0v-gt2BQbdG6vh2zY15MVmB8EWgf6H1FR1VpKwSSfTPF5kG9xTnd6zNKhfHUetDersHlPpuw6KX57bXpZq7FOg2nI33iHb71Dt-n4b8hC3MqQXFYQ/s320/audio-amp.png" width="320" /></a></td></tr> 149<tr><td class="tr-caption" style="text-align: center;">Source: EA4NZ</td></tr> 150</tbody></table> 151<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Below you can see a picture of the RF splitter, ADE-1's and audio LPF's. The 7805 and assorted capacitors in the top right is the 5V supply for the 74AC74.</span><br /> 152<br /> 153<div class="separator" style="clear: both; text-align: center;"> 154<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSb91muCoiKr7b_kScBVV-LBEAdrDB4AQYsM-SVkPduahLotO8JmIEzvcJT4LF0ULqRM4ysH6RU87jjX-hDcyPj1wzfZCGp6nj5WvmUgboIN5-w-J7AjOGK_5ECRZhMa691P_2uiEDkS0/s1600/IMG_3602.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1600" data-original-width="1069" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhSb91muCoiKr7b_kScBVV-LBEAdrDB4AQYsM-SVkPduahLotO8JmIEzvcJT4LF0ULqRM4ysH6RU87jjX-hDcyPj1wzfZCGp6nj5WvmUgboIN5-w-J7AjOGK_5ECRZhMa691P_2uiEDkS0/s640/IMG_3602.JPG" width="425" /></a></div> 155<br /> 156<br /> 157<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I note from devttyS0's video that the FST3253 device removes the need for the two ADE-1's by implementing a Tayloe Detector - something to be tried.</span><br /> 158<br /> 159<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: <a href="https://photohamrad.blogspot.co.uk/2017/12/homebrew-hf-sdr-transceiver-si5351.html">The Si5351</a></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/2901911502767071851/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-adding-ade.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/2901911502767071851'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/2901911502767071851'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-adding-ade.html' title='Homebrew SDR HF Transceiver - Adding the ADE-1 Mixers'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
159<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEip-qgHUviVpYz8rNkQaNa1djTgblnbh3eF8Ru10suuASiNI8tPiLBUYrCZm1cgDKWGseEo1VmV2BmY-MeaBK-0yEAdvOhaPG-yGj0rBESc7gSBt3tTbDOV740DAukUyi8U-IAhx6tswQ4/s72-c/SDS00024.BMP" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-4289254762773531777</id><published>2017-12-15T22:06:00.002+00:00</published><updated>2017-12-28T15:47:42.738+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - RF Splitter</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The RF splitter is used to split the incoming RF into two equal parts. These individual signals are then used as input to the ADE-1 mixers that produce the I &amp; Q signals (90 degrees out of phase). Obviously you don't want to lose too much power in the splitter circuit and you want&nbsp;to ensure that the two output signals are of equal magnitude.</span><br /> 160<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Update: 27 Dec 2017. The splitter design I originally used did not produce zero phase difference. Hence I have updated this page with another design.</span><br /> 161<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 162<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I built this splitter based on a design from EMRFD (Experimental Methods in RF Design, Hayward, Campbell &amp; Larkin), specifically the one from the 18 MHz transceiver shown in Fig. 11.14.</span><br /> 163<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 164<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The schematic is below:</span><br /> 165<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 166<br /> 167<div class="separator" style="clear: both; text-align: center;"> 168<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVZBN7Bnj6kVc3R-iLmGpJ2VIeRiIn4Y1c9U8VAoFl3xPRTso0jBilC90VBuwCkT6drq-hU76OHAxuVBqo8yd_36swDyX6i7z6vwDpkjQRSUwSWNKva3y_3Vcxxxbsxry1ReFG7jgETGk/s1600/rf+splitter+schematic.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="304" data-original-width="731" height="266" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVZBN7Bnj6kVc3R-iLmGpJ2VIeRiIn4Y1c9U8VAoFl3xPRTso0jBilC90VBuwCkT6drq-hU76OHAxuVBqo8yd_36swDyX6i7z6vwDpkjQRSUwSWNKva3y_3Vcxxxbsxry1ReFG7jgETGk/s640/rf+splitter+schematic.png" width="640" /></a></div> 169<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 170<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 171<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I used an FT50-43 toroid with 6 bifilar turns.</span><br /> 172<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">My built version can be seen in the picture below.</span><br /> 173<br /> 174<div class="separator" style="clear: both; text-align: center;"> 175<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5BxT74g20FNUGEjyeLG0-yRDnxJyQ549Av_N1lUkA3CaYWfiTd0Bv1OO9tDIXRxzQ-Cz7o9P91p38_g3r8JtKHz-Zu4F7RAErzt7PvgKZWpS7V_jsGoZ7P6nDyQc-XRUyDIfQqe6-dzo/s1600/IMG_3601.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1069" data-original-width="1600" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg5BxT74g20FNUGEjyeLG0-yRDnxJyQ549Av_N1lUkA3CaYWfiTd0Bv1OO9tDIXRxzQ-Cz7o9P91p38_g3r8JtKHz-Zu4F7RAErzt7PvgKZWpS7V_jsGoZ7P6nDyQc-XRUyDIfQqe6-dzo/s640/IMG_3601.JPG" width="640" /></a></div> 176<div class="separator" style="clear: both; text-align: center;"> 177</div> 178<br /> 179<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The picture below shows the outputs from ports 1 and 2. They are equal in amplitude and in phase which is perfect.</span><br /> 180<br /> 181<div class="separator" style="clear: both; text-align: center;"> 182<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0a2n8CR1Gv1wG4OjjfAfhnF4PxhCbrayqZq7np5ynExT8O9UylHtH75iEfbzDYdQpoKIETtKf8ebvF2ZRubkQzVdn7K9Yya0FypTNFVcwHiy9l91hFYkAX2OXuJkBogooxygppJGvPoo/s1600/SDS00022.BMP" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj0a2n8CR1Gv1wG4OjjfAfhnF4PxhCbrayqZq7np5ynExT8O9UylHtH75iEfbzDYdQpoKIETtKf8ebvF2ZRubkQzVdn7K9Yya0FypTNFVcwHiy9l91hFYkAX2OXuJkBogooxygppJGvPoo/s640/SDS00022.BMP" width="640" /></a></div> 183<div class="separator" style="clear: both; text-align: center;"> 184</div> 185<div class="separator" style="clear: both; text-align: center;"> 186</div> 187<br /> 188<br /> 189<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: <a href="https://photohamrad.blogspot.co.uk/2017/12/homebrew-hf-sdr-transceiver-adding-ade.html">Adding the ADE-1 mixers</a></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/4289254762773531777/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-rf-splitter.html#comment-form' title='2 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/4289254762773531777'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/4289254762773531777'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-rf-splitter.html' title='Homebrew SDR HF Transceiver - RF Splitter'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
189<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjVZBN7Bnj6kVc3R-iLmGpJ2VIeRiIn4Y1c9U8VAoFl3xPRTso0jBilC90VBuwCkT6drq-hU76OHAxuVBqo8yd_36swDyX6i7z6vwDpkjQRSUwSWNKva3y_3Vcxxxbsxry1ReFG7jgETGk/s72-c/rf+splitter+schematic.png" height="72" width="72"/><thr:total>2</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-3981253489961538339</id><published>2017-12-13T19:57:00.000+00:00</published><updated>2017-12-28T15:43:06.070+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - Band pass filter</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The band pass filter (BPF) is used to filter out strong signals from outside of the frequency band of interest. I have built a 7MHz BPF so the receiver will initially&nbsp;be limited to the 40m band. However, to cover other bands a BPF will be required per band and switched in and out of circuit as the receiver is tuned to the different bands.</span><br /> 190<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 191<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I used a circuit that I found on <a href="http://vk4ffab.info/2016/05/29/40m-band-pass-filter/" target="_blank">VK4FFAB's</a> site, I initially built this as input to a NE602 mixer where the impedance needs to be 1500 ohms but for this project replaced the 270 &amp; 18 pF capacitors with 220 &amp; 56 pF ones to create 50 ohm output.</span><br /> 192<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 193<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The circuit schematic is below, the output is chopped off but is just to the right of the 18pF capacitor with the output of the 18pF capacitor carrying the signal to the next stage.</span><br /> 194<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 195<br /> 196<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 197<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhFehWv8G46Rd4iK-Btj3Eki_O3TnMCwsIWGPjZx349FFTbvqXeQ4IKJ_l8cLjNiJx4u6qPLtAgYnN3mtbR4W80CZbIzvdfRuWYOue6iGXJVYD9jwxUGtlZbuElOADMMh7yXPwIEd3PM0/s1600/BPF+circuit.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="168" data-original-width="340" height="316" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhFehWv8G46Rd4iK-Btj3Eki_O3TnMCwsIWGPjZx349FFTbvqXeQ4IKJ_l8cLjNiJx4u6qPLtAgYnN3mtbR4W80CZbIzvdfRuWYOue6iGXJVYD9jwxUGtlZbuElOADMMh7yXPwIEd3PM0/s640/BPF+circuit.png" width="640" /></a></td></tr> 198<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Credit: VK4FFAB</span></td></tr> 199</tbody></table> 200<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 201<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 202<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The <a href="http://www.tonnesoftware.com/elsie.html" target="_blank">Elsie</a> (filter design tool) plot for this is:</span><br /> 203<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 204<br /> 205<div class="separator" style="clear: both; text-align: center;"> 206<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGw27JWMX2TK18JhOzi4JcHZsx-E6kles_I1fYu5LBorlfgS97Xm80MHUf6Ay44SnuWdC_ZwyjXtsrHzmJ7yqsLe5TntUt
206VI9h85aXNUoJVu7fRJxYqExMhqa5ZnCX9KEAOG-IpcgNvTQ/s1600/Elsie+BPF+plot.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="762" data-original-width="1600" height="304" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhGw27JWMX2TK18JhOzi4JcHZsx-E6kles_I1fYu5LBorlfgS97Xm80MHUf6Ay44SnuWdC_ZwyjXtsrHzmJ7yqsLe5TntUtVI9h85aXNUoJVu7fRJxYqExMhqa5ZnCX9KEAOG-IpcgNvTQ/s640/Elsie+BPF+plot.png" width="640" /></a></div> 207<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 208<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">My built version looks like this:</span><br /> 209<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 210<br /> 211<div class="separator" style="clear: both; text-align: center;"> 212<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjyqAM2V2fNrfo8AUs25IUFhyJWPj7NLyWNvNFECm5crJ5yJCOxemxMgIKWgMBezesg7c0g7HkdYLFsguaHOUbH2zrmfnP97tFHE4zAiSjVAhWSFdHS-BbG3dmaGPBpaazepwrpdUd3Snk/s1600/IMG_3583.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1068" data-original-width="1600" height="426" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjyqAM2V2fNrfo8AUs25IUFhyJWPj7NLyWNvNFECm5crJ5yJCOxemxMgIKWgMBezesg7c0g7HkdYLFsguaHOUbH2zrmfnP97tFHE4zAiSjVAhWSFdHS-BbG3dmaGPBpaazepwrpdUd3Snk/s640/IMG_3583.JPG" width="640" /></a></div> 213<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 214<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Having built the circuit I connected my <a href="https://kb8ojh.net/projects/noisegen/" target="_blank">Wideband RF Noise Generator</a> to the input of the RF amp and the output of the RF amp to the input of the BPF. I then connected my oscilloscope to the output of the BPF and used the FFT function to plot the frequency that the filter passes through.&nbsp;</span><br /> 215<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 216<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The result is shown below. The yellow line is the signal from the wideband noise generator, the purple line shows the response of the filter centred nicely on 7.1 MHz.&nbsp;</span><br /> 217<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 218<br /> 219<div class="separator" style="clear: both; text-align: center;"> 220<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiyaV0jgBOSFYqgrbZar8i7jpfredZAj9XSNT8dxD8RWvOKCW2PdM7yt6PcNx_D_gzMmAAmAdJ_9w75s9sKFGcpMZMTyjpAw6SCMmd2EN5Fq_zlyWpi3H0cNkDWQHT-JlLSt2ZzmAondYg/s1600/7MHz-
220BPF.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiyaV0jgBOSFYqgrbZar8i7jpfredZAj9XSNT8dxD8RWvOKCW2PdM7yt6PcNx_D_gzMmAAmAdJ_9w75s9sKFGcpMZMTyjpAw6SCMmd2EN5Fq_zlyWpi3H0cNkDWQHT-JlLSt2ZzmAondYg/s640/7MHz-BPF.png" width="640" /></a></div> 221<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 222<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The variable capacitors in the circuit can be used to fine tune the centre of the filter. If you don't have an oscilloscope then a cheap'ish device like the <a href="https://www.ebay.co.uk/itm/YAEGE-FC-1-Frequency-Counter-50MHz-2-6GHz-10Hz-100MHz/262839601513?hash=item3d32760969:m:mq3-LIwltHQZTsh3qOu_D1w" target="_blank">Yaege FC-1</a>&nbsp;can also be used. I have one of these and it can be used to measure very low power. Using a short piece of coax connected to the BNC connector with two crocodile clips or similar connected to the centre and braid at the other end of the coax you can connect to the output of the BPF and ground. If you input a very low power at 7.1 MHz into the BPF you can then tune the capacitors in the BPF to give maximum power output meaning that the circuit should be tuned to pass most power at 7.1 MHz.</span><br /> 223<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 224<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">You can also use the FC-1 to check that the RF amp is amplifying an input signal.</span><br /> 225<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 226<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: <a href="https://photohamrad.blogspot.co.uk/2017/12/homebrew-hf-sdr-transceiver-rf-splitter.html">RF Splitter.</a></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/3981253489961538339/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-band-pass.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/3981253489961538339'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/3981253489961538339'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-band-pass.html' title='Homebrew SDR HF Transceiver - Band pass filter'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjhFehWv8G46Rd4iK-Btj3Eki_O3TnMCwsIWGPjZx349FFTbvqXeQ4IKJ_l8cLjNiJx4u6qPLtAgYnN3mtbR4W80CZbIzvdfRuWYOue6iGXJVYD9jwxUGtlZbuElOADMMh7yXPwIEd3PM0/s72-c/BPF+circuit.png" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5062935112867774441</id><published>2017-12-13T18:09:00.002+00:00</published><updated>2017-12-28T15:45:10.404+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><title type='text'>Homebrew SDR HF Transceiver - RF Amp</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The RF amplifier is the first component of the receive chain. It is used to amplify the incoming signals and this circuit provides about 7dB of gain, a little over multiplying the incoming signal by 5.</span><br /> 227<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 228<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The amplifier is called a Termination Insensitive Amplifier (TIA) and is taken directly from the 2009 <a href="https://www.google.co.uk/url?sa=t&amp;rct=j&amp;q=&amp;esrc=s&amp;source=web&amp;cd=1&amp;cad=rja&amp;uact=8&amp;ved=0ahUKEwiTluCHu4fYAhUnIMAKHf2NA6MQFggsMAA&amp;
228url=http%3A%2F%2Fw7zoi.net%2Fbidirectional_matched_amplifier.pdf&amp;usg=AOvVaw2A5UHjtr5p1z9mbTV-UM02" target="_blank">paper</a> describing TIA's by W7ZOI &amp; K3NHI. In the paper this amp is the one in Figure 6. The benefit of a TIA is that it is not affected by the termination impedance&nbsp;of the preceding or following stages so we have one less potential issue to think about. In the final transceiver I will build a bidirectional TIA but for now and to get things moving on the receive side I settled on this design. KK9JEF&nbsp;has a good <a href="https://kk9jef.wordpress.com/2017/08/13/video-introduction-to-termination-insensitive-amplifiers/" target="_blank">video</a>&nbsp;showing how TIA's work.</span><br /> 229<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 230<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Directly copied from W7ZOI &amp; K3NHI's paper the circuit is:</span><br /> 231<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 232<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsnLlsHxsWwqMnyxnpOky-8-hc8kc9wmPudITdXI57qUwlO4xecLnR3eq98dQxvJo65cWPjO-eiYsSXNn8dIMQvx0nN6e-dwCCSWLc37vKQONt5L0pDISstH2Pl6GQL6Y1449-h29VMGc/s1600/TIA.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="233" data-original-width="333" height="278" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsnLlsHxsWwqMnyxnpOky-8-hc8kc9wmPudITdXI57qUwlO4xecLnR3eq98dQxvJo65cWPjO-eiYsSXNn8dIMQvx0nN6e-dwCCSWLc37vKQONt5L0pDISstH2Pl6GQL6Y1449-h29VMGc/s400/TIA.png" width="400" /></a></td></tr> 233<tr><td class="tr-caption" style="text-align: center;">Credit: W7ZOI &amp; K3NHI</td></tr> 234</tbody></table> 235<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 236<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">In my version I used ceramic capacitors for the 0.1uF bypass capacitors rather than the electrolytics shown in the circuit. The 4.3K ohm resistor is not a standard value so I used a 1K ohm and a 3.3K in series (1K&nbsp;+ 3.3K = 4.3K)</span><br /> 237<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 238<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The input to the amp is the connector shown on the bottom left of the circuit and the output is the one on the right hand side. Below is a photograph of my build.</span><br /> 239<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 240<br /> 241<div class="separator" style="clear: both; text-align: center;"> 242</div> 243<br /> 244<div class="separator" style="clear: both; text-align: center;"> 245<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgU8OYGcrYZSZbA0MoFSZ8aJPyGSDRblWcgkUOsHPHOwTs-dnfkJs1Vazgf9KD5vcmUnSoUcr1bJWny4WSVFbITiOmFRW9XnweUf2_W1nlIuLbneQS9p965W0wgOYQUVnYQl9OGYWAwF7c/s1600/IMG_3579.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1068" data-original-width="1600" height="425" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgU8OYGcrYZSZbA0MoFSZ8aJPyGSDRblWcgkUOsHPHOwTs-dnfkJs1Vazgf9KD5vcmUnSoUcr1bJWny4WSVFbITiOmFRW9XnweUf2_W1nlIuLbneQS9p965W0wgOYQUVnYQl9OGYWAwF7c/s640/IMG_3579.JPG" width="640" /></a></div> 246<div class="separator" style="clear: both; text-align: center;"> 247<br /></div> 248<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">You can see that I have used an SMA connector on the output port. Since I took the picture&nbsp;I have also added an SMA on the input. I've decided that I like using these as it means I can disconnect and reconnect modules easily. I bought a bunch of sockets and crimp plugs (for use with RG174 coax) on ebay. However, there is no reason as far as I know why you shouldn't solder the coax centre and braid to the board directly as I have done many times before.</span><br /> 249<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 250<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">As an FYI here is a close up of the SMA connector on the board. I just scraped the copper away with a knife and checked with a multimeter that the copper the centre pin is soldered to was not connected to the rest of the board.</span><br /> 251<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 252<br /> 253<div class="separator" style="clear: both; text-align: center;"> 254<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9X-BP8qkR5GDorTNVEB83m0dmkapzhCh9T60pTR_FunAKgspuEJg6j6GOb_SvD-H5yIAfYOglPpW4xQ7SUML6SeXd64ok_8LaYLUqR-lCTEgiMKr7Ija4NP1VvkV7gZcdN54BOkusB1w/s1600/IMG_3578.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1068" data-original-width="1600" height="425" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi9X-BP8qkR5GDorTNVEB83m0dmkapzhCh9T60pTR_FunAKgspuEJg6j6GOb_SvD-H5yIAfYOglPpW4xQ7SUML6SeXd64ok_8LaYLUqR-lCTEgiMKr7Ija4NP1VvkV7gZcdN54BOkusB1w/s640/IMG_3578.JPG" width="640" /></a></div> 255<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 256<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Finally I connected a signal source to the input (AD9850 and Arduino, see <a href="http://www.ad7c.com/projects/ad9850-dds-vfo/" target="_blank">here</a>) and using my oscilloscope measured the gain at several different frequencies. Yellow line is the input and blue line is the amplified output. At 10 MHz the gain is about 8dB and you can see that at 14 MHz the gain has started to drop.</span><br /> 257<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 258<br /> 259<div class="separator" style="clear: both; text-align: center;"> 260</div> 261<br /> 262<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 263<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_raErr2jSheYdvhgM0FcUXs289Vxehmf5yEJYwu7zRgJeNiUjb7DV9
263N1dRnujgPJD99lrjDhk5EVAoiJqBHex0LbExkmzE9Q5DF2OI9jyK0gVkzymHYIgho0XaIrlblFwBix2sg4RHdU/s1600/3MHz-RF-amp-gain.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_raErr2jSheYdvhgM0FcUXs289Vxehmf5yEJYwu7zRgJeNiUjb7DV9N1dRnujgPJD99lrjDhk5EVAoiJqBHex0LbExkmzE9Q5DF2OI9jyK0gVkzymHYIgho0XaIrlblFwBix2sg4RHdU/s640/3MHz-RF-amp-gain.png" width="640" /></a></td></tr> 264<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">3 MHz</span></td></tr> 265</tbody></table> 266<div class="separator" style="clear: both; text-align: center;"> 267<br /></div> 268<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 269<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhR5cpuKoO4OUf_jWWBchXYDhUu4EYwctMPlmqjad9SG3_mlGLQLxVu1u_qZGiKiunTmvNF9dLmMxsPFjqrhjhpkGoW5KMlwXHlYUr0vyvwoc9izuZLsPr7eKQ17Pu6cvCRWHlaUnjdf68/s1600/7MHz-RF-amp-gain.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhR5cpuKoO4OUf_jWWBchXYDhUu4EYwctMPlmqjad9SG3_mlGLQLxVu1u_qZGiKiunTmvNF9dLmMxsPFjqrhjhpkGoW5KMlwXHlYUr0vyvwoc9izuZLsPr7eKQ17Pu6cvCRWHlaUnjdf68/s640/7MHz-RF-amp-gain.png" width="640" /></a></td></tr> 270<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">7 MHz</span></td></tr> 271</tbody></table> 272<div class="separator" style="clear: both; text-align: center;"> 273<br /></div> 274<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 275<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7t70n7Vd37FwfdOnacvWVjgroQTG3D0eZLdJlhdKytvG-ecxo-lWDYg4E8DSFmHOymkZDnO5N_VexQGEwvnfTE5lloyKf0ror4jGJp33oh4v64kHwZaM-1xovbDmkSi2mmTOwrQH15nk/s1600/10MHz-RF-amp-gain.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg7t70n7Vd37FwfdOnacvWVjgroQTG3D0eZLdJlhdKytvG-ecxo-lWDYg4E8DSFmHOymkZDnO5N_VexQGEwvnfTE5lloyKf0ror4jGJp33oh4v64kHwZaM-1xovbDmkSi2mmTOwrQH15nk/s640/10MHz-RF-amp-gain.png" width="640" /></a></td></tr> 276<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">10 MHz</span></td></tr> 277</tbody></table> 278<div class="separator" style="clear: both; text-align: center;"> 279<br /></div> 280<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 281<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNpchh7MmDTQPYmGA72PT_AQ1lVx0C-LjfptO1AcXAEGVBMvoEcFxBc3LLxxZf1gDXKXOGP-q-k9Cz88u4nDJcl2AhqZ4nbf7Jo23j9xyYFqQzghDVnMmeERSEHOcRZQvLY82iwHaLhkI/s1600/14MHz-RF-amp-gain.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="235" data-original-width="480" height="312" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNpchh7MmDTQPYmGA72PT_AQ1lVx0C-LjfptO1AcXAEGVBMvoEcFxBc3LLxxZf1gDXKXOGP-q-k9Cz88u4nDJcl2AhqZ4nbf7Jo23j9xyYFqQzghDVnMmeERSEHOcRZQvLY82iwHaLhkI/s640/14MHz-RF-amp-gain.png" width="640" /></a></td></tr> 282<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">14 MHz<br /><span style="font-size: small;"><br /></span></span><br /> 283<div style="text-align: left;"> 284<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><span style="font-size: small;">Next post: <a href="https://photohamrad.blogspot.co.uk/2017/12/homebrew-sdr-hf-transceiver-band-pass.html">Band pass filter</a>.</span></span></div> 285<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"> 286</span></td></tr> 287</tbody></table> 288</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5062935112867774441/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-rf-amp.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5062935112867774441'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5062935112867774441'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-hf-sdr-transceiver-rf-amp.html' title='Homebrew SDR HF Transceiver - RF Amp'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
288<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjsnLlsHxsWwqMnyxnpOky-8-hc8kc9wmPudITdXI57qUwlO4xecLnR3eq98dQxvJo65cWPjO-eiYsSXNn8dIMQvx0nN6e-dwCCSWLc37vKQONt5L0pDISstH2Pl6GQL6Y1449-h29VMGc/s72-c/TIA.png" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5723098650519077048</id><published>2017-12-13T13:03:00.000+00:00</published><updated>2017-12-14T12:55:58.408+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><category scheme="http://www.blogger.com/atom/ns#" term="sdr"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32f7"/><title type='text'>Homebrew SDR HF Transceiver - Introduction</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">In 2016 I spent some time working on a VLF/LF receiver by I2PHD that was fully software defined, see <a href="http://photohamrad.blogspot.co.uk/2017/01/vlflf-receiver-implemented-in.html" target="_blank">here</a>. The challenge of this approach is the speed of the ADC and subsequent processing that is required within a microcontroller. There just were not enough clock cycles to implement a waterfall display for example.</span><br /> 289<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 290<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Recently I have been looking at the YouTube channel of Charlie Morris, <a href="https://www.youtube.com/channel/UCSNPW3_gzuMJcX_ErBZTv2g/featured" target="_blank">ZL2CTM</a>, who has built a software defined radio (SDR) using a Teensy microcontroller. Charlie doesn't give a whole lot of details about how to build this radio but I decided I wanted to try it out. Edit: I have also been looking at&nbsp;</span><span style="background-color: white; text-align: justify;"><span style="font-family: Arial, Helvetica, sans-serif;"><a href="http://rheslip.blogspot.co.uk/2015/01/teensy-sdr-project-update.html">VE3MKC's</a><span style="font-size: 14px;"> </span>blog, I thought VE3MKC and ZL2CTM were the same person but it appears that they have been doing the same thing independently. My thanks to them both for the inspiration and for the information they have published.</span></span><br /> 291<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 292<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Given my experience with the VLF/LF receiver and the <a href="http://www.st.com/content/st_com/en.html" target="_blank">ST Microelectronics</a>&nbsp;boards I used as well as the fact that I have three of these boards here I decided to build my version ZL2CTM's HF SDR receiver and transmitter that will be standalone, i.e. it will not require a PC to operate.</span><br /> 293<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 294<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The block diagram below shows the main components of the transceiver although as most components are shared between transmitter and receiver I haven't bothered to put the transmit components in the diagram. When I come onto that area I will add them. I have included a description of the function of each block.</span><br /> 295<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 296<br /> 297<div class="separator" style="clear: both; text-align: center;"> 298<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ1OVmjr7SU_f4V3ZO-iRlwsLpqeniAujQrUA6DoMeClSlaLrpxamAYlsCiF_IFYYjoWuGpxPnHTvA2H1w5ZSseVNcHuE-It0V32_MBO9sLmIzZQ9xSY_EHPti8zYytt0HoLXPHvEqcwQ/s1600/Block+Diagram1.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="794" data-original-width="1058" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ1OVmjr7SU_f4V3ZO-iRlwsLpqeniAujQrUA6DoMeClSlaLrpxamAYlsCiF_IFYYjoWuGpxPnHTvA2H1w5ZSseVNcHuE-It0V32_MBO9sLmIzZQ9xSY_EHPti8zYytt0HoLXPHvEqcwQ/s640/Block+Diagram1.png" width="640" /></a></div> 299<div class="separator" style="clear: both; text-align: center;"> 300</div> 301<div class="separator" style="clear: both; text-align: center;"> 302</div> 303<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Originally I had not planned to blog about this build but a post on <a href="
303https://hackaday.com/2017/12/07/radio-amateuring-like-its-1975/" target="_blank">Hackaday</a>&nbsp;bought forth some comments on Twitter:</span><br /> 304<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 305<br /> 306<div class="separator" style="clear: both; text-align: center;"> 307<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhf2boyHe2D5Iq_hxRJ9aHpucDLmQnbGr4iVQYCB7xLOAk0gn3t3lmu_-A08j0WzRf1MS6Zb5Onwy4QrcKDHJi634EojbvmNtpmMhlgNq5mPfzmCQykihlrLbCu75RX6fAhJ7lbxvWBAPg/s1600/Screenshot_2017-12-11_14-59-20.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="580" data-original-width="598" height="310" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhf2boyHe2D5Iq_hxRJ9aHpucDLmQnbGr4iVQYCB7xLOAk0gn3t3lmu_-A08j0WzRf1MS6Zb5Onwy4QrcKDHJi634EojbvmNtpmMhlgNq5mPfzmCQykihlrLbCu75RX6fAhJ7lbxvWBAPg/s320/Screenshot_2017-12-11_14-59-20.png" width="320" /></a></div> 308<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 309<br /> 310<div class="separator" style="clear: both; text-align: center;"> 311</div> 312<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Consequently, I couldn't really not blog about this project.</span><br /> 313<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 314<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I could say that all the individual parts of this project are simple enough but I frequently&nbsp;come across projects or circuits that leave out descriptions of a 'simple' part of the circuit because the experienced builder just cannot believe that not everybody knows what they know. Consequently, I will try to explain each section as I go along or provide a link to a resource on the Internet that does a much better job of describing it than I ever could. All components except the ADE-1 are through hole components and I will build Manhattan style. The ADE-1 can (just) be mou
314nted in this way. After I complete this project I would like to try to build the same circuits using only SMD parts as a follow up.</span><br /> 315<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 316<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">My choice of the <a href="http://www.st.com/content/ccc/resource/technical/document/data_brief/b3/48/2b/e3/d2/12/45/c1/DM00179227.pdf/files/DM00179227.pdf/jcr:content/translations/en.DM00179227.pdf" target="_blank">STM32F746-Discovery</a> board is mainly because I have one here. It costs about $55 and, although there does seem to be a bit of a lead time in the UK at the moment (December 2017), it is still in production and is fantastic value for money. It contains an ARM Cortex-M7 microprocessor, ADC's (analogue-digital controller), DAC's (digital-analogue controller), ethernet, micro-SD card interface, audio line-in/out and a 4.3" colour LCD-TFT screen with capacitive touch input among other features. You'd be hard pressed to find a 4.3" capacitive touch LCD alone for the same price on e-bay.</span><br /> 317<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 318<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">If I hadn't found that ST have recently licenced <a href="https://dspconcepts.com/st" target="_blank">DSP Concepts Audio Weaver</a> software for use royalty-free on ST devices this project wouldn't be going ahead but the Audio Weaver software is fantastic. It will enable me to de
318sign the software audio processing parts of the solution on a PC (sadly it doesn't work on Linux, even under Wine) and tune these in real time while they are deployed to the STM32F746 device. When the tuning is completed the code can be deployed standalone to the microcontroller. In fact, at the moment I think that the hardest part of this whole project is going to be building the graphical user interface, for which I will use <a href="http://www.st.com/en/embedded-software/stemwin.html" target="_blank">STemWin</a>, another piece of software that ST licence for their customers to use royalty-free.</span><br /> 319<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 320<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">What will you need if you plan to join in with me in this project? I am going to make the assumption that you have built some electronic circuits or kits before, firstly I'll build the RF components that produce the I/Q outputs that will be fed into the STM32F746:</span><br /> 321<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 322<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Soldering iron and other tools you use to build circuits</span><br /> 323<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Several pieces of single sided copper clad board like <a href="https://www.ebay.co.uk/itm/Copper-Clad-Boards-Single-Sided-FR2-70mm-x-100mm-for-PCB-Artwork-UK-Stock/111834363819?ssPageName=STRK%3AMEBIDX%3AIT&amp;_trksid=p2057872.m2749.l2649" target="_blank">this</a></span><br /> 324<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><a href="http://qrpme.com/?p=product&amp;id=MES" target="_blank">MeSquares</a>&nbsp;to enable Manhatten style construction</span><br /> 325<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">RG174 or similar thin co-axial cable to link the RF stages</span><br /> 326<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><a href="https://www.silabs.com/documents/public/data-sheets/Si5351-B.pdf" target="_blank">Si5351</a> breakout board, available from <a href="https://learn.adafruit.com/adafruit-si5351-clock-generator-breakout/overview" target="_blank">Adafruit</a> and other resellers</span><br /> 327<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><a href="https://assets.nexperia.com/documents/data-sheet/74HC_HCT74.pdf" target="_blank">74HC74</a> D-type flip flop</span><br /> 328<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">2 x <a href="https://ww2.minicircuits.com/pdfs/ADE-1.pdf" target="_blank">ADE-1-24</a> frequency mixers or the non-SMD but more expensive equivalent (SBL-1)</span><br /> 329<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">A handful of&nbsp;<a href="https://www.sparkfun.com/datasheets/Components/2N3904.pdf" target="_blank">2N3904</a> transistors</span><br /> 330<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">There will also be some resistors, capacitors and ferrite cores required that I will detail as I go along.</span><br /> 331<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The STM32F746-Discovery board from your favourite electronics reseller, Farnell &amp; RS stock them in the UK amongst others or direct from </span><a href="http://www.st.com/en/evaluation-tools/32f746gdiscovery.html" style="font-family: Arial, Helvetica, sans-serif;" target="_blank">ST</a><br /> 332<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 333<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">
333If you already have an oscilloscope with FFT function then I suggest you build a wideband RF noise generator which will be useful to test the RF amp and bandpass filter. I built one like <a href="https://kb8ojh.net/projects/noisegen/" target="_blank">this</a>&nbsp;because it uses the ubiquitous 2N3904 transistors but many designs are available on the web.</span><br /> 334<br /> 335<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Finally, a warning. This will be a learn as you go along project and if you follow along you need to be prepared to trouble shoot and fault find. As it stands at the moment I believe that it will be possible to build a transceiver as described above. What I do know is that we will all learn something and prove that not all of us are "Radio Amateuring like it's 1975"!</span><br /> 336<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 337<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Next post: <a href="http://photohamrad.blogspot.co.uk/2017/12/homebrew-hf-sdr-transceiver-rf-amp.html">The RF amp.</a></span><br /> 338<br /> 339<br /></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5723098650519077048/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-introduction.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5723098650519077048'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5723098650519077048'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/12/homebrew-sdr-hf-transceiver-introduction.html' title='Homebrew SDR HF Transceiver - Introduction'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiZ1OVmjr7SU_f4V3ZO-iRlwsLpqeniAujQrUA6DoMeClSlaLrpxamAYlsCiF_IFYYjoWuGpxPnHTvA2H1w5ZSseVNcHuE-It0V32_MBO9sLmIzZQ9xSY_EHPti8zYytt0HoLXPHvEqcwQ/s72-c/Block+Diagram1.png" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5369223886439106081</id><published>2017-01-17T16:40:00.000+00:00</published><updated>2017-01-18T18:55:33.496+00:00</updated><title type='text'>VLF/LF Receiver implemented in microprocessor - Rotary encoder control and LCD (Part 4 of n)</title><content type='html'><br /> 340<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The rotary encoder control works by switching between screen buttons on each push of the encoder button. The button that is activated is highlighted in blue when active, non-buttons that have actions are highlighted in red. Turning the encoder clockwise or anti-clockwise will change the option and activate it immediately. When the station name is red you can tune manually (the station name will change to 'User' after the frequency has been changed).</span><br /> 341<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 342<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Having reviewed my code it is difficult to describe in detail exactly which changes need to be made to add rotary encoder control. However, as far as I am aware I have put a comment including the word 'rotary' in every place where I have added code for this reason.&nbsp;</span><br /> 343<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 344<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">If you want to backport the rotary encoder code to the STM32F4 board I suggest you search all the code for the word 'rotary' - </span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">grep -r rotary * </span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">- and take it from there.</span><br /> 345<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 346<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">
346There are three main additions of code to support the rotary encoder. There is a:</span><br /> 347<br /> 348<ul> 349<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">new routine in </span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">SDR_initPeriphs.c</span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"> called&nbsp;&nbsp;</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">initEncoder()</span></li> 350<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">new routine in&nbsp;</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">main.c </span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">called </span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">ManageEncoder()</span></li> 351<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">new routine in&nbsp;</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">stm32f7xx_hal_msp.c </span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">called</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">&nbsp;HAL_TIM_Encoder_MspInit()</span></li> 352<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">an additional section in the&nbsp;</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">HAL_GPIO_EXTI_Callback </span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">routine in </span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">stm32f7xx_it.c</span></li> 353<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Elsewhere various variables are defined in </span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">main.h </span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">and </span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">Globals.h</span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">.</span></li> 354</ul> 355<br /> 356<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 357<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Adding the external LCD involved a lot of digging around in low level LCD controller code. It must have affected my brain because now I cannot see what I changed to make it work. There's some pin definitions for the LCD in </span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">main.h</span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">, maybe that's all it needs but I am sure the STemWin GUI controller is defined somewhere. If you want to look into this area then the file&nbsp;</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">LCD_X_8080_8.h</span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">&nbsp;would be a good place to start.&nbsp;</span><br /> 358<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 359<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">A video of the rotary encoder/LCD combination will be posted here shortly.</span><br /> 360<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 361<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The code is available on github <a href="https://github.com/g0fcu/ARM-radio" target="_blank">link</a></span><br /> 362<blockquote class="tr_bq"> 363<br /> 364<br /> 365<blockquote class="tr_bq"> 366<br /></blockquote> 367</blockquote> 368</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5369223886439106081/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/01/vlflf-receiver-implemented-in_17.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5369223886439106081'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5369223886439106081'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/01/vlflf-receiver-implemented-in_17.html' title='VLF/LF Receiver implemented in microprocessor - Rotary encoder control and LCD (Part 4 of n)'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-6691693511187024330</id><published>
3682017-01-16T20:53:00.002+00:00</published><updated>2017-01-18T18:55:07.378+00:00</updated><title type='text'>VLF/LF Receiver implemented in microprocessor - Hardware Configuration (Part 3 of n)</title><content type='html'><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 369<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">This post assumes that the RF pre-amp and audio out circuits have been built as described by I2PHD in his original <a href="http://www.weaksignals.com/" target="_blank">paper</a> found under the ARM Radio section of his website.</span><br /> 370<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 371<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Microprocessor - STM32F746-Nucleo <a href="http://www.st.com/en/evaluation-tools/nucleo-f746zg.html" target="_blank">board</a>.</span><br /> 372<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD - ILI9341 driver, looks the same as this <a href="
372http://domoticx.com/arduino-shield-2-4-tft-lcd-touch/" target="_blank">one</a>&nbsp;</span><br /> 373<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Rotary encoder with integrated push switch</span><br /> 374<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 375<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">My code uses the following pin connections:</span><br /> 376<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 377<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>Component Pin &nbsp;STM32F746 Pin</b></span><br /> 378<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC0</span><br /> 379<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC1</span><br /> 380<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC2</span><br /> 381<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D3 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC3</span><br /> 382<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D4 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC4</span><br /> 383<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D5 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC5</span><br /> 384<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D6 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC6</span><br /> 385<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_D7 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PC7</span><br /> 386<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_RST &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;PE2</span><br /> 387<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_CS &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;PE3</span><br /> 388<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_RS &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;PE4</span><br /> 389<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_WR &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; PE5</span><br /> 390<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">LCD_RD &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;PE6</span><br /> 391<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 392<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Rotary encoder clockwise &nbsp; &nbsp; &nbsp; &nbsp; PB4</span><br /> 393<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Rotary encoder anti-clockwise &nbsp;PB5</span><br /> 394<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Rotary encoder centre &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;GND</span><br /> 395<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Rotary encoder push button &nbsp; &nbsp; PA0</span><br /> 396<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 397<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">RF In &nbsp; &nbsp; &nbsp; &nbsp; PA3</span><br /> 398<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Audio Out &nbsp;PA4</span><br /> 399<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 400<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">In the next post I will describe the code I have added to support the rotary encoder functionality as well as the changes to the screen layout.</span><br /> 401<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 402<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The cide is available on github <a href="https://github.com/g0fcu/ARM-radio" target="_blank">link</a></span><br /> 403<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/6691693511187024330/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/01/vlflf-receiver-implemented-in_48.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/6691693511187024330'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/6691693511187024330'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/01/vlflf-receiver-implemented-in_48.html' title='VLF/LF Receiver implemented in microprocessor - Hardware Configuration (Part 3 of n)'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-8772294179226784639</id><published>2017-01-15T17:55:00.000+00:00</published><updated>2017-01-18T18:54:38.698+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="i2phd"/><category scheme="http://www.blogger.com/atom/ns#" term="lf"/><category scheme="http://www.blogger.com/atom/ns#" term="receiver"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32"/><category scheme="http://www.blogger.com/atom/ns#" term="stm32f7"/><category scheme="http://www.blogger.com/atom/ns#" term="vlf"/><title type='text'>VLF/LF Receiver implemented in microprocessor - Introduction (Part 1 of n)</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 404<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhANmDpHC
4047ROU-sDl2MiJSDwBkicQt3L1T0MYeWMiaM-Qp3j5nqT-oTmv9FILdtGnqEyP5nBAiwhd9sSwrihLiz5N8Bmw1cM5XEQ3bbaIVpIarZgaNlS53NMyx3hF6_vt-loqRj79awS1k/s1600/IMG_20170115_173348.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="240" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhANmDpHC7ROU-sDl2MiJSDwBkicQt3L1T0MYeWMiaM-Qp3j5nqT-oTmv9FILdtGnqEyP5nBAiwhd9sSwrihLiz5N8Bmw1cM5XEQ3bbaIVpIarZgaNlS53NMyx3hF6_vt-loqRj79awS1k/s320/IMG_20170115_173348.jpg" width="320" /></a></div> 405<div dir="ltr"> 406<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 407<div dir="ltr"> 408<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 409<div dir="ltr"> 410<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Alberto, I2PHD, developed a VLF to MF <a href="http://www.weaksignals.com/" target="_blank">receiver</a> entirely in a microprocessor utilising the <a href="http://www.st.com/en/microcontrollers/stm32f4-series.html?querycriteria=productId=SS1577" target="_blank">STM32F4</a> Discovery board. I was intrigued by this so I purchased a <a href="http://www.st.com/content/st_com/en/products/microcontrollers/stm32-32-bit-arm-cortex-mcus/stm32f7-series.html?querycriteria=productId=SS1858" target="_blank">STM32F746</a> Discovery board. The F7 board uses the faster ARM Cortex M7 processor rather than the M4 processor used in the STM32F4 range of boards.</span></div> 411<div dir="ltr"> 412<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 413<div dir="ltr"> 414<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">However, I soon found that the STM32F7 Disco board does not make the same GPIO pins available to use. Specifically only the third analogue-digital converter (ADC3) of three is available to use. Alberto's design uses ADC's 1 &amp; 2 in double buffered mode and this approach is fundamental, consequently I realised that I would not be able to use this board for the receiver. By the time I had worked this out ST had released the STM32F746-Nucleo board, this board is similar to the Discovery board except it makes all the GPIO pins available to use but it does not have a built in LCD display.</span></div> 415<div dir="ltr"> 416<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 417<div dir="ltr"> 418<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I was not able to compile the source code written for the F4 board for the F7 board. Whether this was through my lack of experience or for some other reason I do not know as the code is meant to be compatible between the two devices. Subsequently, I proceeded to rewrite the code to use the Hardware Abstraction Layer (HAL) provided by ST. Due to the fragmented and incomplete nature of documentation for the HAL a great deal of experimentation and trial &amp; error was involved. However, this did mean that my understanding of C programming for embedded microprocessors and associated debugging using <a href="https://www.sourceware.org/gdb/" target="_blank">gdb</a> increased quickly.</span></div> 419<div dir="ltr"> 420<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 421<div dir="ltr"> 422<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Currently the status of this project is as follows:</span></div> 423<div dir="ltr"> 424</div> 425<ul> 426<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Code for STM32F4 ported to work with the STM32F7 devices using&nbsp;HAL firmware library version 1.3.0*</span></li> 427<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">To overcome the lack of an LCD on the Nucleo board an inexpensive LCD was purchased on ebay which uses the ILI9341 LCD controller and this was integrated into the code.</span></li> 428<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">To overcome zero documentation on how to use the touch screen capabilities of the LCD I bought I implemented control using a rotary encoder.</span></li> 429<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I have added a spectogram function which shows a display of the signals being received - this is a work in progress.</span></li> 430</ul> 431<div> 432<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">* I have looked at using the newer 1.5.1 HAL firmware but there have been significant changes made to the operation of some of the functions and I don't intend to rewrite the code to handle these at the moment.</span></div> 433<div> 434<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 435<div> 436<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The picture at the top of this post shows the receiver receiving the MSF time signal on 60kHz.</span></div> 437<div> 438<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></div> 439<div> 440<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I plan a series of blog posts to document this project. My plan is for posts covering the following topics:</span></div> 441<div> 442<ul> 443<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Setting up the development environment - using Eclipse IDE, GCC compiler, OpenSTM32, gdb.</span></li> 444<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">My implementation and the hardware connections, particularly covering the LCD and rotary encoder.</span></li> 445<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Specifics around the rotary encoder control and the LCD.</span></li> 446<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The spectogram function.</span></li> 447<li><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Wrap-up, including some problems I have yet to overcome.</span></li> 448</ul> 449<div> 450<span style="font-family: arial, helvetica, sans-serif;">The code is available on github <a href="https://github.com/g0fcu/ARM-radio" target="_blank">link</a></span></div> 451</div> 452</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/8772294179226784639/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2017/01/vlflf-receiver-implemented-in.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/8772294179226784639'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/8772294179226784639'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2017/01/vlflf-receiver-implemented-in.html' title='VLF/LF Receiver implemented in microprocessor - Introduction (Part 1 of n)'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
452<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhANmDpHC7ROU-sDl2MiJSDwBkicQt3L1T0MYeWMiaM-Qp3j5nqT-oTmv9FILdtGnqEyP5nBAiwhd9sSwrihLiz5N8Bmw1cM5XEQ3bbaIVpIarZgaNlS53NMyx3hF6_vt-loqRj79awS1k/s72-c/IMG_20170115_173348.jpg" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-8709983810247955780</id><published>2015-06-07T17:06:00.000+01:00</published><updated>2020-06-21T16:44:15.571+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="datv"/><category scheme="http://www.blogger.com/atom/ns#" term="hackrf"/><category scheme="http://www.blogger.com/atom/ns#" term="hackrf blue"/><category scheme="http://www.blogger.com/atom/ns#" term="hackrfblue"/><category scheme="http://www.blogger.com/atom/ns#" term="hamradio"/><title type='text'>Transmitting video with a HackRF Blue</title><content type='html'><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody> 453<tr><td style="text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgps3arVnnaSqh6S1eRQYvAQDnYrz1D9b6M803GEr1DY9QUL6CQTmm5f-noJHc5vWq8A5D46qMfPwcfaOT4EbWfBqibw2Em3sdf52X
453ojyAVBc3_M8Kkw7AV-vNBsfEPaJvwBh5BvQQo56I/s1600/IMAG1692+%25281%2529.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="362" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgps3arVnnaSqh6S1eRQYvAQDnYrz1D9b6M803GEr1DY9QUL6CQTmm5f-noJHc5vWq8A5D46qMfPwcfaOT4EbWfBqibw2Em3sdf52XojyAVBc3_M8Kkw7AV-vNBsfEPaJvwBh5BvQQo56I/s640/IMAG1692+%25281%2529.jpg" width="640" /></a></td></tr> 454<tr><td class="tr-caption" style="text-align: center;"><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Picture of the video of my garden transmitted by my HackRF Blue</span></td></tr> 455</tbody></table> 456<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">In the UK much digital amateur television (DATV) is transmitted using the DVB-S standard. This is the standard used in Europe to transmit standard definition satellite television.</span><br /> 457<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 458<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Eventually I aim to transmit video through my local DATV repeater. What I have done is to prove the feasibility of using a <a href="http://hackrfblue.com/" target="_blank">HackRF Blue</a>&nbsp;to act as the radio frequency part of the system.</span><br /> 459<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 460<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I have drawn a diagram showing the individual components I used and I will go on to describe each in more detail.</span><br /> 461<div class="separator" style="clear: both; text-align: center;"> 462<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiAB0I-q8O7VRfDRyRMg9cC1rAk9qdgCT8r6vPhSDIz-XPKofzFigLHGWMn0In6izkE0YYZ_Rw2JCqwSY-kPgVkBvK_IU4Kq0QGxtJhF_9mgfz2lowsWW_nP4D0vUzoC5zd6c06XQQOc8/s1600/diagram.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiiAB0I-q8O7VRfDRyRMg9cC1rAk9qdgCT8r6vPhSDIz-XPKofzFigLHGWMn0In6izkE0YYZ_Rw2JCqwSY-kPgVkBvK_IU4Kq0QGxtJhF_9mgfz2lowsWW_nP4D0vUzoC5zd6c06XQQOc8/s640/diagram.jpg" width="640" /></a></div> 463<b style="font-family: Arial, Helvetica, sans-serif;">Camera</b><br /> 464<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I have used a standard DV video camera (Canon MV450i). It is possible to&nbsp;substitute&nbsp;this for a standard webcam.&nbsp;</span><br /> 465<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 466<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>Computer</b></span><br /> 467<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I use a 4 core Intel Core i5-2400, 3.10GHz CPU with 4Gb of memory. Operating system is xubuntu 14.04.</span><br /> 468<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 469<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>dvgrab</b></span><br /> 470<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">This software is used to grab the DV stream from the Firewire port that the DV camera is connected to. If you use a webcam then it is not necessary to use this program. It can be installed from the Ubuntu Softw
470are Centre or via the <a href="http://www.kinodv.org/" target="_blank">Kino</a> pages.</span><br /> 471<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 472<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>ffmpeg</b></span><br /> 473<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><a href="https://www.ffmpeg.org/" target="_blank">ffmpeg</a> is used to convert the raw video stream grabbed by dvgrab into an MPEG-2 transport stream. If you are using a webcam you will need to change the parameters for the input source and the input video codec. It can be installed from the Ubuntu Software Centre or from the&nbsp;</span><a href="https://www.ffmpeg.org/" style="font-family: Arial, Helvetica, sans-serif;" target="_blank">ffmpeg</a>&nbsp;<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">site.</span><br /> 474<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 475<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The output from ffmpeg is sent to a fifo file to be consumed by the gnuradio program.</span><br /> 476<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 477<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>gnuradio</b></span><br /> 478<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I have gnuradio installed via <a href="http://gnuradio.org/redmine/projects/pybombs/wiki" target="_blank">pybombs</a> and am currently running version 3.7.7. Ron Economos has written the gnuradio blocks to enable DVB-S to be transmitted. You will need to download &amp; install these from <a href="https://github.com/drmpeg/gr-dvbs" target="_blank">github</a>. Included in the download is a gnuradio-companion flowgraph. Open this in gnuradio-companion to verify that you have installed the DVB-S gnuradio blocks in the correct place. If blocks show up as red then you haven't. However, Ron's code does not use a HackRF so I have changed the output sink to be a HackRF. You may also want to change the input to be a mpeg-2 transport stream file for testing and/or to reflect the location of the fifo file on your system</span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">.</span><br /> 479<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 480<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">You can download my HackRF version of the transmit program from <a href="https://drive.google.com/file/d/11Mf841yAhH_4gjx05F36IZ3S905ng_Db/view?usp=sharing" target="_blank">here</a>&nbsp;<b>and edit it to change the reference to the directory I used for my fifo file to the one on your machine.</b></span><br /> 481<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 482<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>Example commands</b></span><br /> 483<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 484<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">One off commands</span><br /> 485<br /> 486<ul> 487<li><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">mkdir ~/dvb-s</span></li> 488<li><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">cd ~/dvb-s</span></li> 489<li><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">mkfifo mpeg2.fifo</span></li> 490</ul> 491<br /> 492<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Command to run dvgrab and ffmpeg</span><br /> 493<br /> 494<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">cd ~/dvb-s</span><br /> 495<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;"><br /></span> 496<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">dvgrab - | ffmpeg -re -thread_queue_size 1000 -i /dev/stdin -vcodec rawvideo -f alsa -i hw:0,0 -acodec mp2 -s 640x480
496-r 25 -b:v 2M -minrate:v 2M -maxrate:v 2M -bufsize:v 1.4M -ac 2 -b:a 48k -mpegts_transport_stream_id 1025 -mpegts_service_id 1 -mpegts_pmt_start_pid 0x0fff -mpegts_start_pid 0x0121 &nbsp;-muxrate 2M -f mpegts -y mpeg2.fifo</span><br /> 497<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b><br /></b></span> 498<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I suspect that some of these parameters are surplus to requirements but these are what worked for me.</span><br /> 499<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 500<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">To use a webcam remove "</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">dvgrab - |" </span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">from the start of the line and</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">&nbsp;</span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">substitute "</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">-i /dev/stdin -vcodec rawvideo"</span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">&nbsp;&nbsp;with "</span><span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">-i /dev/video0 -vcodec mpeg2video"</span><br /> 501<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;"><br /></span> 502<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">To test that this step is working you can use mplayer to consume the video feed from the fifo file:</span><br /> 503<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">mplayer mpeg2.fifo</span><br /> 504<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span><span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">To transmit the video stream open another terminal window</span><br /> 505<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">cd ~/dvb-s</span><br /> 506<span style="font-family: &quot;courier new&quot; , &quot;courier&quot; , monospace;">./dvbs_tx_hackrf.py</span><br /> 507<br /> 508<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The transmission looks like this when received by gqrx on another HackRF.</span><br /> 509<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 510<br /> 511<div class="separator" style="clear: both; text-align: center;"> 512<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhK_fxnJiJvnPi4Zt6MFFfVTVv4Hi2iLyGqT5T5oZF8TOuQjr0P8TmG1k5HIbP34LT6iY6o3wGuGU7JmQ6a91IfGMRrYQshCSHVRYcX5PuJ9bPFXQk7qDo2NuBzMlygVmD0THvhgxesF5Y/s1600/dvbs_output.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="256" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhK_fxnJiJvnPi4Zt6MFFfVTVv4Hi2iLyGqT5T5oZF8TOuQjr0P8TmG1k5HIbP34LT6iY6o3wGuGU7JmQ6a91IfGMRrYQshCSHVRYcX5PuJ9bPFXQk7qDo2NuBzMlygVmD0THvhgxesF5Y/s640/dvbs_output.png" width="640" /></a></div> 513<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 514<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>How to receive the signal.</b></span><br /> 515<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b><br /></b></span> 516<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I used a standard DVB-S satellite TV receiver. However, these use an LNB which mixes the 10/11GHz signal with a 9750 MHz (or 10700 MHz) local oscillator (LO) to produce a signal around 1000-1250 MHz. In this case we do not use the LNB but connect an antenna directly to the input port where the LNB usually connects.&nbsp;</span><br /> 517<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b><br /></b></span> 518<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b><span style="color: red;">
518WARNING: the antenna port has 13/18 Volts on the centre core. Do not allow your makeshift antenna to short across the inner and outer of the antenna port or you may damage your receiver.</span></b></span><br /> 519<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 520<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">In my example I have the HackRF Blue transmitting on 1000 MHz. I set the receiver to receive on 10750 MHz. As the LO is at 9750 MHz, 9750 plus 1000 = 10750. You need to know the LO your LNB is using (it is normally marked on them or try both values). So, I set the satellite receiver to scan for a signal on 10750 MHz.&nbsp;</span><br /> 521<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 522<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">The other value the receiver needs to know is the symbols/second value. In the gnuradio program I have set it to 2 million symbols/second. Most satellite receivers will receive a minimum of 2m sym/sec, and this is the value you need to set in the receiver (or 2000k sym/sec). FEC can also be specified but my receiver set this to 'AUTO'.</span><br /> 523<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b><br /></b></span> 524<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>Antenna</b></span><br /> 525<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b><br /></b></span> 526<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">My satellite receiver is located underneath the television in an adjacent room to my study. Due to the use of a dummy load the transmission can only be received if the antenna from the satellite receiver is close to the dummy load. I used a length of satellite co-axial cable long enough to reach between both rooms, terminated one end with a F-type plug to fit the antenna socket of the satellite receiver. At the other end I connected the inner core of the co-ax to the driven element of a 1296 MHz beam I made recently. The outer core I taped up with insulating tape to ensure that it was not going to short to the inner conductor.</span><br /> 527<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 528<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">I haven't tried this but if you expose 7.5 cm of the centre conductor having cut back the outer sheath, the outer shield of copper and the inner dielectric (taking care not to short the inner and outer conductors) this should work as a quarter wave antenna at 1000 MHz. You will probably have to hold it very close to the dummy load connected to the HackRF Blue to receive the signal.&nbsp;</span><br /> 529<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 530<b style="font-family: Arial, Helvetica, sans-serif;"><span style="color: red;">WARNING: Wrap the centre conductor you expose in insulating tape to prevent accidental shorting as there is still 13/18V on the centre conductor.</span></b><br /> 531<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 532<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">
532With my 23 cm beam pointing at the dummy load I was able to receive the signal about 5 metres away.</span><br /> 533&nbsp; 534<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /><b>References</b><br /><br />Explanation of the ffmpeg parameters <a href="http://www.waveguide.se/?article=creating-dvb-t-compatible-mpeg2-streams-using-ffmpeg" target="_blank">here</a> and <a href="http://www.tannet.org.uk/using-ffmpeg-to-generate-a-transport-stream-more-details-and-how-to-add-text-overlays/" target="_blank">here</a>.</span><br /> 535<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Details of transmitting DVB-T using a webcam <a href="http://www.irrational.net/2014/03/02/digital-atv/" target="_blank">here</a>.</span><br /> 536<br /> 537<b> 538<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">Legal advisory</span></b><br /> 539<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 540<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">It is illegal to transmit on radio frequencies for which you do not possess a valid licence issued by your government. I hold an amateur radio licence so am allowed to transmit on a set of defined frequencies. However, for this experiment I transmitted into a <a href="http://en.wikipedia.org/wiki/Dummy_load" target="_blank">dummy load</a>, meaning that the transmission was not radiated more than about 3 metres.</span><br /> 541<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 542<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">For more information on becoming a radio amateur please contact your national amateur radio organisation. See the list <a href="http://www.iaru.org/member-societies.html" target="_blank">here</a>.</span><br /> 543<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span> 544<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b>The small print</b></span><br /> 545<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><b><br /></b></span> 546<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;">If some or other part of this doesn't work for you please don't send me a curt email saying "It doesn't work". It works for me on my system so try and understand why it doesn't work and adapt it to your environment.</span><br /> 547<span style="font-family: &quot;arial&quot; , &quot;helvetica&quot; , sans-serif;"><br /></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/8709983810247955780/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2015/06/transmitting-video-with-hackrf-blue.html#comment-form' title='8 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/8709983810247955780'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/8709983810247955780'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2015/06/transmitting-video-with-hackrf-blue.html' title='Transmitting video with a HackRF Blue'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
547<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgps3arVnnaSqh6S1eRQYvAQDnYrz1D9b6M803GEr1DY9QUL6CQTmm5f-noJHc5vWq8A5D46qMfPwcfaOT4EbWfBqibw2Em3sdf52XojyAVBc3_M8Kkw7AV-vNBsfEPaJvwBh5BvQQo56I/s72-c/IMAG1692+%25281%2529.jpg" height="72" width="72"/><thr:total>8</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-4314936591685520140</id><published>2015-04-25T22:04:00.002+01:00</published><updated>2015-04-25T22:05:21.917+01:00</updated><title type='text'>Meteor M-N2 reception with a HackRF</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 548<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiE7-5JdQZfn1KXFLaGIvTVKupzDq0iNIRGL26M2Z9PgoSNd28Gxpn6wIuboqDOvrFG5ZWfkGc4rxrLLCI_nvS4PFFXQcp2v-oaUiZ4Byeo_erointd1rXjEoIF6mgw2L8jUf1igba1kak/s1600/meteor_LRPT_25042015_1011.s_122-rectified1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiE7-5JdQZfn1KXFLaGIvTVKupzDq0iNIRGL26M2Z9PgoSNd28Gxpn6wIuboqDOvrFG5ZWfkGc4rxrLLCI_nvS4PFFXQcp2v-oaUiZ4Byeo_erointd1rXjEoIF6mgw2L8jUf1igba1kak/s1600/meteor_LRPT_25042015_1011.s_122-rectified1.jpg" height="400" width="227" /></a></div> 549<br /> 550<span style="font-family: Arial, Helvetica, sans-serif;">If you've got a&nbsp;<a href="http://greatscottgadgets.com/hackrf/" target="_blank">HackRF</a>&nbsp;
550you can easily use it to receive pictures from weather satellites in low earth orbit without tracking antennas, just like the one above (NB. the two thick black lines are a fault with the spacecraft and not with my reception!). <a href="http://www.noaa.gov/" target="_blank">NOAA</a>&nbsp;have several <a href="http://en.wikipedia.org/wiki/Low_Earth_orbit" target="_blank">LEO</a> weather satellites in operation but these only transmit an older, lower resolution picture. The newer NOAA satellite had a problem which means that it does not transmit in the VHF frequencies.</span><br /> 551<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 552<span style="font-family: Arial, Helvetica, sans-serif;">However, the Russian satellite - Meteor M-N2 - is operational transmitting <a href="http://en.wikipedia.org/wiki/Low_Rate_Picture_Transmission" target="_blank">LRPT</a> in the 137 MHz band.</span><br /> 553<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 554<span style="font-family: Arial, Helvetica, sans-serif;">There is a method of receiving these pictures on Linux using cheap RTL dongles (there are also methods on Windows which I will not cover) and I have adapted this method to work with the HackRF. Specifically I have also moved the receive frequency of the satellite away from the centre frequency the HackRF is tuned to. This avoids the centre DC spike and associated problems.</span><br /> 555<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 556<span style="font-family: Arial, Helvetica, sans-serif;">In the UK the satellite band is very close to wide area pager frequencies, this leads to considerable breakthrough of pager transmissions into the very weak satellite signals. This&nbsp;interference&nbsp;causes the couple of yellow and blue lines in the image above. What I have found is that&nbsp;this method of reception with the HackRF is much less&nbsp;susceptible to pager problems that when using an RTL dongle. It is also more sensitive compared to my RTL dongle leading to images&nbsp;received to lower elevations (where the signal is weakest).</span><br /> 557<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 558<span style="font-family: Arial, Helvetica, sans-serif;">The GNUradio program I have adapted is available <a href="https://dl.dropboxusercontent.com/u/70097664/meteor_qpsk_rx_hackrf.py" target="_blank">here</a>. Of course, you will need GNUradio installed (if you have a HackRF you presumably already do!)</span><br /> 559<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 560<span style="font-family: Arial, Helvetica, sans-serif;">You will find reference to my home directory in it which you will need to change first, and also make it executable </span><span style="font-family: Courier New, Courier, monospace;">chmod +x meteor_qpsk_rx_hackrf.py</span><br /> 561<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 562<span style="font-family: Arial, Helvetica, sans-serif;">Then simply run it by typing&nbsp;</span><span style="font-family: Courier New, Courier, monospace;">./meteor_qpsk_rx_hackrf.py </span><span style="font-family: Arial, Helvetica, sans-serif;">from the directory that you copied it into.</span><br /> 563<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 564<span style="font-family: Arial, Helvetica, sans-serif;">When you are receiving the satellite it helps to adjust the PLL Alpha slider on the QPSK constellation window to lock onto the signal (with the four cluster
564s on the constellation) and when lock is achieve to move this slider to its minimum setting. With no signal the constellation should look iike this:</span><br /> 565<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 566<br /> 567<div class="separator" style="clear: both; text-align: center;"> 568<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzrya0ATPuxQMCgvCzSNOVBPxc0rcG5Be7_cU51YGMG4JDa3ZltZm_F136POKDi37SH_HHTLdLN1_CzieGuXp6dRg4MZGzlOVKXMcfoTFCh0uP21y4Ii390hikcp03jOvEH86sNWdQSUg/s1600/nolock.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhzrya0ATPuxQMCgvCzSNOVBPxc0rcG5Be7_cU51YGMG4JDa3ZltZm_F136POKDi37SH_HHTLdLN1_CzieGuXp6dRg4MZGzlOVKXMcfoTFCh0uP21y4Ii390hikcp03jOvEH86sNWdQSUg/s1600/nolock.png" height="236" width="320" /></a></div> 569<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 570<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 571<br /> 572<div class="separator" style="clear: both; text-align: center;"> 573<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtSqwKSujOSQK5D372CpV7UONxtC71aVXl4gk5KvXSZOzjQ02FvE7FiH52Aww0lxGJvIoa0sWF4hwZmNiiXvYQwu2wTvdXCs2q0xureO8dmBgbm6PznveNgIk40G2FrPSOurL-5XlHW1c/s1600/spectrum.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhtSqwKSujOSQK5D372CpV7UONxtC71aVXl4gk5KvXSZOzjQ02FvE7FiH52Aww0lxGJvIoa0sWF4hwZmNiiXvYQwu2wTvdXCs2q0xureO8dmBgbm6PznveNgIk40G2FrPSOurL-5XlHW1c/s1600/spectrum.png" height="235" width="320" /></a></div> 574<div class="separator" style="clear: both; text-align: center;"> 575<br /></div> 576<div class="separator" style="clear: both; text-align: left;"> 577<span style="font-family: Arial, Helvetica, sans-serif;">When the satellite is close I see a spectrum like the screen shot above, and the constellation like the screen shot below.</span></div> 578<br /> 579<div class="separator" style="clear: both; text-align: center;"> 580<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_rcyp7LU590Z8KItVXMh68l46uBNtctau6zdfcDm2xbJhVku7XolEneWEaOaNDiG7uvcWu3MPMmEDEY6qIqQq4uJ04qyVNCnTZGeGTwqgl0My_iiFmQGmsWPyEgVwH4hCTZGwEa9l0ns/s1600/constellation.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj_rcyp7LU590Z8KItVXMh68l46uBNtctau6zdfcDm2xbJhVku7XolEneWEaOaNDiG7uvcWu3MPMmEDEY6qIqQq4uJ04qyVNCnTZGeGTwqgl0My_iiFmQGmsWPyEgVwH4hCTZGwEa9l0ns/s1600/constellation.png" height="236" width="320" /></a></div> 581<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 582<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 583<span style="font-family: Arial, Helvetica, sans-serif;">To work out when Meteor M-N2 is going to be nearby use the <a href="http://gpredict.oz9aec.net/" target="_blank">GPredict</a> satellite tracking program.</span><br /> 584<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 585<span style="background-color: white; font-family: Arial, Helvetica, sans-serif; line-height: 18.2000007629395px;">Once the soft symbol.s file has been received using this program then it is time to open Oleg's</span><span style="background-color: white; font-family: Arial, Helvetica, sans-serif; line-height: 18.2000007629395px;">&nbsp;</span><a href="http://meteor.robonuka.ru/soft/" style="background-color: white; font-family: Arial, Helvetica, sans-serif; line-height: 18.2000007629395px; text-decoration: none;" target="_blank">LRPTOffLineDecoder&nbsp;</a><span style="background-color: white; font-family: Arial, Helvetica, sans-serif; line-height: 18.2000007629395px;">program to produce the image. This is a Windows program but runs well under Wine in Linux.</span><br /> 586<div style="background-color: white; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; font-size: 13px; line-height: 18.2000007629395px;"> 587<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 588<div class="separator" style="background-color: white; clear: both; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; font-size: 13px; line-height: 18.2000007629395px; text-align: center;"> 589<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVH3UqZA6W9jE89Pmr374TfOZDYRtvu87Vg-7RpiLzD1BdH8sH71YzbFymBJMehri_Qw6hP2eEJ1NxZdpR-cUSZmO599ZWRaUkB-yzouekdR2uOzIm4HFub3QcccMkG4UnLK-ASW4hw1k/s1600/Capture.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em; text-decoration: none;"><span style="color: black;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVH3UqZA6W9jE89Pmr374TfOZDYRtvu87Vg-7RpiLzD1BdH8sH71YzbFymBJMehri_Qw6hP2eEJ1NxZdpR-cUSZmO599ZWRaUkB-yzouekdR2uOzIm4HFub3QcccMkG4UnLK-ASW4hw1k/s1600/Capture.JPG" style="-webkit-box-shadow: rgba(0, 0, 0, 0.2) 0px 0px 20px; background-attachment: initial; background-clip: initial; background-image: initial; background-origin: initial; background-position: initial; background-repeat: initial; background-size: initial; border-radius: 0px; border: 1px solid rgb(204, 204, 204); box-shadow: rgba(0, 0, 0, 0.2) 0px 0px 20px; padding: 8px; position: relative;" /></span></a></div> 590<div class="separator" style="background-color: white; clear: both; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; font-size: 13px; line-height: 18.2000007629395px;"> 591<br /></div> 592<div class="separator" style="background-color: white; clear: both; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; line-height: 18.2000007629395px;"> 593<span style="font-family: Arial, Helvetica, sans-serif;">The image above is a part of the window of Oleg's program.&nbsp;</span></div> 594<div class="separator" style="background-color: white; clear: both; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; line-height: 18.2000007629395px;"> 595</div> 596<ul style="background-color: white; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; line-height: 18.2000007629395px; margin: 0.5em 0px; padding: 0px 2.5em;"> 597<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Click the "72k" button (as the satellite is sending data at a symbol rate of 72k but it has also sent at 80k).</span></li> 598<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Navigate to the place on your hard drive where the .s output file from the GNUradio program is stored, select the file and click ok.</span></li> 599<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">You should see the two progress bars start to move and the constellation of the received signal show in the top left hand side of the window.</span></li> 600<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">This step can take some time.&nbsp;</span></li> 601<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">If the image can be decoded the infrared/visible channels received will be shown to the right hand side.</span></li> 602<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Click "RGB"
602 to generate a false colour image, you need to select the RGB drop down lists to correspond to the wavelengths that were received otherwise you will just get an all white or black image. You can also change the RGB settings to change the colouration of the image. At this point you can also save the image.</span></li> 603</ul> 604<div style="background-color: white; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; line-height: 18.2000007629395px;"> 605<span style="font-family: Arial, Helvetica, sans-serif;">Oleg's&nbsp;<a href="http://meteor.robonuka.ru/" style="text-decoration: none;" target="_blank">website</a>&nbsp;has other examples of images received plus links to the software etc. You can see other images I have received <a href="http://photohamrad.blogspot.co.uk/p/images-from-meteor-m-n2-weather.html" target="_blank">here</a>.</span></div> 606<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 607<span style="font-family: Arial, Helvetica, sans-serif;">NB: for nightime images only the infrared wavelength is usable (normally 10.5-11.5) so set the RGB settings all to 10.5-11.5. To achieve an image you can make sense of you will need to load the resulting image into GIMP and flip it horizontally, flip it vertically then invert the colours. Then adjust the contrast and brightness to bring out the land/sea by trial and error.</span><br /> 608<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 609<span style="font-family: Arial, Helvetica, sans-serif;">The image below is a night time image. This has not been rectified to take out the curvature of the earth as the image at the top of this post has.</span><br /> 610<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 611<br /> 612<div class="separator" style="clear: both; text-align: center;"> 613<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtRT1LUNfvP59oe3w_zr3fLjlqJIJk0dkKnSG3SaBfrUDdGEfMN5WOdsqNO19XsrfhpkmN_QWyCflHXhdF9B19-GWEX-aX03xK8A6gJoxy_02_LLIPiHRw6mSY7WhlEXWAeb9MkGPVIUA/s1600/meteor_LRPT_25042015_205957.s_555.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjtRT1LUNfvP59oe3w_zr3fLjlqJIJk0dkKnSG3SaBfrUDdGEfMN5WOdsqNO19XsrfhpkmN_QWyCflHXhdF9B19-GWEX-aX03xK8A6gJoxy_02_LLIPiHRw6mSY7WhlEXWAeb9MkGPVIUA/s1600/meteor_LRPT_25042015_205957.s_555.jpg" height="640" width="274" /></a></div> 614<div class="separator" style="clear: both; text-align: center;"> 615<br /></div> 616<div class="separator" style="clear: both; text-align: left;"> 617<span style="font-family: Arial, Helvetica, sans-serif;">The best antenna to use is a QFH, this <a href="http://www.frars.org.uk/cgi-bin/render.pl?pageid=1154" target="_blank">link</a> has details of how to build one. However, you could use a <a href="http://www.qsl.net/g4hbt/dipole.htm" target="_blank">Crossed dipole</a>, <a href="http://wb5rmg.somenet.net/k5oe/Eggbeater_2.html" target="_blank">egg-beater</a> (really!), or a simple quarter wave. You will receive something on a good overhead pass on a quarterwave or an amateur 2 metre antenna but don't expect images like the ones on this page. Of course, whatever antenna you use it should be as high and as in the clear and outside as possible. Having said that my QFH is pushed up through the branches of a tree. I also use an old 2 metre pre-amplifier to give the signal an added boost.</span></div> 618<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 619<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/4314936591685520140/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2015/04/meteor-m-n2-reception-with-hackrf.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/4314936591685520140'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/4314936591685520140'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2015/04/meteor-m-n2-reception-with-hackrf.html' title='Meteor M-N2 reception with a HackRF'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
619<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiE7-5JdQZfn1KXFLaGIvTVKupzDq0iNIRGL26M2Z9PgoSNd28Gxpn6wIuboqDOvrFG5ZWfkGc4rxrLLCI_nvS4PFFXQcp2v-oaUiZ4Byeo_erointd1rXjEoIF6mgw2L8jUf1igba1kak/s72-c/meteor_LRPT_25042015_1011.s_122-rectified1.jpg" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5837407137610770091</id><published>2014-12-22T23:25:00.001+00:00</published><updated>2014-12-22T23:25:24.778+00:00</updated><title type='text'>2014 goals update</title><content type='html'><br /> 620<span style="font-family: Arial, Helvetica, sans-serif;">Earlier this year I wrote about my <a href="http://photohamrad.blogspot.co.uk/2014_02_01_archive.html" target="_blank">thirty years</a> as a radio amateur. I created a to do list, here's how I got on:</span><br /> 621<ul style="background-color: white; color: #333333; font-family: Arial, Tahoma, Helvetica, FreeSans, sans-serif; font-size: 13px; line-height: 18.2000007629395px; list-style-image: initial; list-style-position: initial; margin: 0.5em 0px; padding: 0px 2.5em;"> 622<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Have a JT65B QSO - I have completed quite a few contacts on 10W, mainly on 17m, it is amazing how far low power can reach as I have made contacts from Japan to South America.</span></li> 623<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Run WSPR to test antenna configurations - I have used WSPR to check out antennas as I have made changes.</span></li> 624<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Receive QRSS signals - Done,&nbsp;<i>see&nbsp;<a href="http://photohamrad.blogspot.co.uk/2014/03/first-try-with-qrss.html" style="color: #015782; text-decoration: none;" target="_blank">here</a></i></span></li> 625<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Amend my Arduino WSPR system to also transmit QRSS. I've done this, and also added transmission of Sequential Multi-tone Hellschreiber,&nbsp;<i>see&nbsp;<a href="http://photohamrad.blogspot.co.uk/2014/03/multi-function-ad9850-mept-with-wspr.html" style="color: #015782; text-decoration: none;">here</a></i></span></li> 626<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Build a 70Mhz amplifier - I completed my 70Mhz transverter by adding a 10W amplifier made by an amateuamateur in Poland. It now drives a Philips A200 linear to 50W.</span></li> 627<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Erect a 50/70Mhz beam - I built a 4m Moxon but still want to get something better up.</span></li> 628<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Have a go at meteor scatter operation on 50/70Mhz - not achieved, the 4/6m beam is a prerequisite.</span></li> 629<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Receive signals bounced off the moon. Not achieved, I'm going to take it off the list.</span></li> 630<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Do some portable HF operating with my FT-817. Not really achieved, apart from one contact while on holiday.</span></li> 631<li style="border: none; margin: 0px 0px 0.25em; padding: 0.25em 0px;"><span style="font-family: Arial, Helvetica, sans-serif;">Get my CW speed back up to something usable - I think this is a long shot but it needs to be on the list! It's improving but still a little way to go.</span></li> 632</ul> 633</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5837407137610770091/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/12/2014-goals-update.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5837407137610770091'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5837407137610770091'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/12/2014-goals-update.html' title='2014 goals update'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-3503387401188156045</id><published>2014-12-22T23:05:00.000+00:00</published><updated>2014-12-22T23:05:31.345+00:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="PAC-12"/><title type='text'>Mini-Digi-Holiday-DXpedition</title><content type='html'><div> 634<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">This year I decided to try some operating from our holiday location of Saas Fee in Switzerland (JN36xc, or so the app on my phone told me). I decided to only use WSPR and JT65 on the 40/20/17m bands. These are the bands that I have made loading coils for use with my&nbsp;<a href="http://photohamrad.blogspot.co.uk/2013/08/the-trials-and-tribulations-of-hf.html" target="_blank">PAC-12</a>&nbsp;vertical antenna.</span><br /> 635<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 636<div> 637</div> 638<div class="separator" style="clear: both; text-align: center;"> 639<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnQsPcRN8wKdByFs40qftLW23XgryY4hKVhsG2gCjPQtvIqo-wY_OIz84gRvq_nIKuyf9JqanjkzyrlW9cgFKgxFJdeLDUpMKZzoWVpyzbdnDB0G-2uT9d2A7VLwYcJJ1gKDrDm4MEMg0/s1600/wspr+from+HB9+20m.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnQsPcRN8wKdByFs40qftLW23XgryY4hKVhsG2gCjPQtvIqo-wY_OIz84gRvq_nIKuyf9JqanjkzyrlW9cgFKgxFJdeLDUpMKZzoWVpyzbdnDB0G-2uT9d2A7VLwYcJJ1gKDrDm4MEMg0/s1600/wspr+from+HB9+20m.jpg" height="228" width="320" /></a></div> 640<div class="separator" style="clear: both; text-align: center;"> 641<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">20m WSPR</span></div> 642<br /> 643<div class="separator" style="clear: both; text-align: center;"> 644<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFaPEBPVfKBTO4yzpit1XuTp4nQKQesprfT-7IL0ubbq7QEC2Hk9U_N90Uqv216jzHmSTcdKG_DXRyyoP92aVD9WZnsG_P5lJWXEuRnlEt2IH4caCiWlE3LMuhW4GIPuyyODKrZ4-YoDk/s1600/17m+wspr.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjFaPEBPVfKBTO4yzpit1XuTp4nQKQesprfT-7IL0ubbq7QEC2Hk9U_N90Uqv216jzHmSTcdKG_DXRyyoP92aVD9WZnsG_P5lJWXEuRnlEt2IH4caCiWlE3LMuhW4GIPuyyODKrZ4-YoDk/s1600/17m+wspr.png" height="286" width="320" /></a></div> 645<div class="separator" style="clear: both; text-align: center;"> 646<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">17m WSPR</span></div> 647<div style="text-align: center;"> 648<br /></div> 649<div style="text-align: left;"> 650<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Digital only because 5W from an FT817 doesn't go very far when surrounded by 4000m peaks on three sides as Saas Fee is.</span></div> 651<div style="text-align: left;"> 652<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 653<div style="text-align: left;"> 654<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">It took me a while to make my first JT65 contact (on 17m) because at times the QRM on 20m was very high, with some specific QRM on the 17m JT65 frequency. I didn't track down the cause of the interference but I assume it was something in the village. When it was not present I received signals from Japan to south America as you can see from the PSKreporter screen shot below.</span></div> 655<div style="text-align: left;"> 656<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 657<div class="separator" style="clear: both; text-align: center;"> 658<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKI2MRmOcyN0xBljxCzxzgrzVAcKob_57v_Wl-APV2PvcJQE0FSEGvSIkwASkjAtKRUrD5ooF4PDNM5QMghWx0c85iFc0WOSIlsJvpzEW5HbDXkZrmlyLxuqMyymAwIXwBOsjMelsIYEQ/s1600/20m+jt65+rx+in+30+mins.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiKI2MRmOcyN0xBljxCzxzgrzVAcKob_57v_Wl-APV2PvcJQE0FSEGvSIkwASkjAtKRUrD5ooF4PDNM5QMghWx0c85iFc0WOSIlsJvpzEW5HbDXkZrmlyLxuqMyymAwIXwBOsjMelsIYEQ/s1600/20m+jt65+rx+in+30+mins.png" height="176" width="320" /></a></div> 659<div style="text-align: center;"> 660<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">20m JT65 signals received in 30 minutes</span></div> 661<div style="text-align: left;"> 662<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 663<br /> 664<div class="separator" style="clear: both; text-align: center;"> 665<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7EjJsEq9i408_A3iO_TtP_FKmqBsMdYi8KcPpsGVwhWu8EyEi4H0ynf5k95JNxU1ErsfHgyKhpQDvACrDf2FX83Q8ugscjckav99cpbtqbz3ZFTZ8qHi97OSM7AxnL5DRWXZnF9hWkiA/s1600/20m+JT9+rx+report+in+US.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh7EjJsEq9i408_A3iO_TtP_FKmqBsMdYi8KcPpsGVwhWu8EyEi4H0ynf5k95JNxU1ErsfHgyKhpQDvACrDf2FX83Q8ugscjckav99cpbtqbz3ZFTZ8qHi97OSM7AxnL5DRWXZnF9hWkiA/s1600/20m+JT9+rx+report+in+US.jpg" height="127" width="320" /></a></div> 666<div class="separator" style="clear: both; text-align: center;"> 667<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">20m JT9 received in the US</span></div> 668<div class="separator" style="clear: both; text-align: center;"> 669<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">I was pleased to see that my JT9 signal was received in the US.</span></div> 670<div class="separator" style="clear: both; text-align: center;"> 671<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 672<div class="separator" style="clear: both; text-align: center;"> 673<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 674<div class="separator" style="clear: both; text-align: center;"> 675<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjjcK-7WKcrU71F9JMrZeJqiA2colLGSQ-58SaV5L1OpJOaMPpV9MRJVyZ9ebLm8s3GzWRP-pRfR3whPgAiaxcrCqSSmD4Cax3ySPqZ4AQLrsYZ8pYxbzLkACd6QDbYwDrHFvpVfWOXBv4/s1600/40m+wspr+map1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjjcK-7WKcrU71F9JMrZeJqiA2colLGSQ-58SaV5L1OpJOaMPpV9MRJVyZ9ebLm8s3GzWRP-pRfR3whPgAiaxcrCqSSmD4Cax3ySPqZ4AQLrsYZ8pYxbzLkACd6QDbYwDrHFvpVfWOXBv4/s1600/40m+wspr+map1.jpg" height="320" width="259" /></a></div> 676<div style="text-align: center;"> 677&nbsp;<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">40m WSPR reception was good around Europe.</span></div> 678<div style="text-align: center;"> 679<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 680<div class="separator" style="clear: both; text-align: center;"> 681<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHSHELjTfJuWpPVzs_p8riym0Ej1gVaGF_N2PaFHLZM1ErKh1dWyzPfnAS62vGpRsgpCwUu3H6eO1LAGcvBj4T5LXsuLfFvRdiu2oW_5oWrGtZw9tM0yNSm0eg6EUy-N_ChnjhZIvjzSI/s1600/40m+wspr+map.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiHSHELjTfJuWpPVzs_p8riym0Ej1gVaGF_N2PaFHLZM1ErKh1dWyzPfnAS62vGpRsgpCwUu3H6eO1LAGcvBj4T5LXsuLfFvRdiu2oW_5oWrGtZw9tM0yNSm0eg6EUy-N_ChnjhZIvjzSI/s1600/40m+wspr+map.jpg" height="280" width="320" /></a></div> 682<div style="text-align: center;"> 683<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">My 40m WSPR signal was received in VK.</span></div> 684<div style="text-align: center;"> 685<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 686<div style="text-align: left;"> 687<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Despite calling CQ on JT65 and JT9 I only managed to make one JT65 contact, this seems odd to me given the fact that I could see that my signal was being logged on PSKReporter. I am happy that my antenna was working well based on its performance with WSPR.</span></div> 688<div style="text-align: left;"> 689<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 690<div style="text-align: left;"> 691<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Given the efficiency of JT65 I had assumed that it would be possible to make more contacts but I can only surmise that the reason I didn't was because of the following:</span></div> 692<div style="text-align: left;"> 693</div> 694<ul> 695<li><span style="font-family: Arial, Helvetica, sans-serif; font-size: x-
695small;">2.5W is too low power</span></li> 696<li><span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Other stations got confused by the different message format that JT65 generates when using a callsign prefix.</span></li> 697</ul> 698</div> 699<div style="text-align: left;"> 700<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Given that the take off was shielded on three sides by 4000m mountains I am pleased with the receive performance of the PAC-12 antenna.</span></div> 701<div style="text-align: left;"> 702<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 703<div style="text-align: left;"> 704<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">On one day I took the 817 out of the apartment and tried for some SSB contacts on 40m. The beauty of the location I was at is that at 2397m it was about 600m higher than Saas Fee and with a clearer take-off to the north. The noise figures on 40m here was S0 and there were many special event stations loud and clear. Unfortunately, they were generating pile-ups that I was not going to break through with 5W. I did have one contact into north Wales but it was hard going for the other station.</span><br /> 705<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 706<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">I would like to get my CW skills polished up so I can try some QRP CW for holiday operating, next year we are going on holiday to somewhere with a better take-off which might also help.</span><br /> 707<br /> 708<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span> 709<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 710<div style="text-align: left;"> 711<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 712</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/3503387401188156045/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/12/mini-digi-holiday-dxpedition.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/3503387401188156045'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/3503387401188156045'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/12/mini-digi-holiday-dxpedition.html' title='Mini-Digi-Holiday-DXpedition'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnQsPcRN8wKdByFs40qftLW23XgryY4hKVhsG2gCjPQtvIqo-wY_OIz84gRvq_nIKuyf9JqanjkzyrlW9cgFKgxFJdeLDUpMKZzoWVpyzbdnDB0G-2uT9d2A7VLwYcJJ1gKDrDm4MEMg0/s72-c/wspr+from+HB9+20m.jpg" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-6951902943900113820</id><published>2014-09-20T11:35:00.004+01:00</published><updated>2014-09-20T19:56:02.355+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="meteor"/><category scheme="http://www.blogger.com/atom/ns#" term="wxsat"/><title type='text'>Thunderstorm in the English Channel</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 713</div> 714<div class="separator" style="clear: both; text-align: center;"> 715<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivGvcxN2mQVeGA3SakRrveAmgPCbRfptr2Gm4BvdZKL9aqxee2_odL8ws8nb27TssfOdF_WasBdc7dt-YTJ3uwBZTW16l4ruqmDNSngHM6jKF6FkU4kBwuKjkTTrSwA14GKR_S4GXZG_o/s1600/20092014-1107-storm.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivGvcxN2mQVeGA3SakRrveAmgPCbRfptr2Gm4BvdZKL9aqxee2_odL8ws8nb27TssfOdF_WasBdc7dt-YTJ3uwBZTW16l4ruqmDNSngHM6jKF6FkU4kBwuKjkTTrSwA14GKR_S4GXZG_o/s1600/20092014-1107-storm.jpg" height="146" width="320" /></a></div> 716<br /> 717<div class="separator" style="clear: both; text-align: center;"> 718</div> 719<div style="text-align: center;"> 720<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Thunderstorm between Cherbourg and Le Harve</span></div> 721<div style="text-align: center;"> 722<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 723<div style="text-align: left;"> 724<span style="font-family: Arial, Helvetica, sans-serif;">The Meteor M-N2 weather satellite, previously described&nbsp;<a href="http://photohamrad.blogspot.co.uk/2014/09/receiving-meteor-m-n2-weather-satellite.html" target="_blank">here</a>, picture received on 20/09/2014 shows a large thunderstorm in the English Channel, completely filling the area of sea between Cherbourg and Le Harve.</span></div> 725<div style="text-align: left;"> 726<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 727<div style="text-align: left;"> 728<span style="font-family: Arial, Helvetica, sans-serif;">Just after I received the picture I grabbed a screen shot from&nbsp;<a href="http://www.lightningmaps.org/realtime?lang=en" target="_blank">www.lightningmaps.org</a><u>&nbsp;</u></span><span style="font-family: Arial, Helvetica, sans-serif;">of the real time lightning strikes from the storm, see below.</span></div> 729<div style="text-align: left;"> 730<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 731<div class="separator" style="clear: both; text-align: center;"> 732<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpDqKn8mYYwZ3Amh93lf9HgjNHY4NTZrBx8h4xpSH8GwEy2Ru6tdwKUTLgKclAiKPCHLk3ifODUkoCCI84HgJwPTJQ0QhajBEEjjtBuAjE-XVnOaW1PLfJbz62177CUuQo-9i49UB0mek/s1600/lightning-storm-200914.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhpDqKn8mYYwZ3Amh93lf9HgjNHY4NTZrBx8h4xpSH8GwEy2Ru6tdwKUTLgKclAiKPCHLk3ifODUkoCCI84HgJwPTJQ0QhajBEEjjtBuAjE-XVnOaW1PLfJbz62177CUuQo-9i49UB0mek/s1600/lightning-storm-200914.jpg" height="110" width="320" /></a></div> 733<div style="text-align: left;"> 734<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 735<div style="text-align: left;"> 736<span style="font-family: Arial, Helvetica, sans-serif;">The full Meteor M-N2 image I received is below.</span></div> 737<div style="text-align: left;"> 738<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 739<div class="separator" style="clear: both; text-align: center;"> 740</div> 741<div style="text-align: left;"> 742<div class="separator" style="clear: both; text-align: center;"> 743<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggPkFOSKFsSGyuYQlKMWhY9U1kaZv5CM1ZCSc4YSeefkMnnHARXmQ7FwQUzQzSAO5lQnq4DhJGhJm4rqCW-Gnak1T0KDD0f9M1jRl92vpJRO2r7mrXOh2BcN7YUSUGpCoG3godYhlp8ZY/s1600/20092014_110700.s.121.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEggPkFOSKFsSGyuYQlKMWhY9U1kaZv5CM1ZCSc4YSeefkMnnHARXmQ7FwQUzQzSAO5lQnq4DhJGhJm4rqCW-Gnak1T0KDD0f9M1jRl92vpJRO2r7mrXOh2BcN7YUSUGpCoG3godYhlp8ZY/s1600/20092014_110700.s.121.jpg" height="320" width="121" /></a></div> 744<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 745</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/6951902943900113820/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/09/thunderstorm-in-english-channel.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/6951902943900113820'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/6951902943900113820'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/09/thunderstorm-in-english-channel.html' title='Thunderstorm in the English Channel'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
745<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEivGvcxN2mQVeGA3SakRrveAmgPCbRfptr2Gm4BvdZKL9aqxee2_odL8ws8nb27TssfOdF_WasBdc7dt-YTJ3uwBZTW16l4ruqmDNSngHM6jKF6FkU4kBwuKjkTTrSwA14GKR_S4GXZG_o/s72-c/20092014-1107-storm.jpg" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-8769512979107817303</id><published>2014-09-16T23:22:00.000+01:00</published><updated>2014-09-20T20:51:01.454+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="meteor"/><category scheme="http://www.blogger.com/atom/ns#" term="wxsat"/><title type='text'>Receiving Meteor M-N2 weather satellite</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 746</div> 747<div class="separator" style="clear: both; text-align: center;"> 748</div> 749<div style="text-align: center;"> 750<div class="separator" style="clear: both; text-align: center;"> 751</div> 752<br /> 753<div class="separator" style="clear: both; text-align: center;"> 754<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmltppl9wbxgOqI35GjzT6GemKPuTniyDEB6ph6Rog2TKvAVZmQwbtxh7oMYgPYQjGDvo0Ot02Q_LTN_dDvklAhWz50Gp20Dtxmxie_557ha1WrJMniXqvBYolEwWE0eKGq9dk-Gnqlxw/s1600/15092014_110610.s.121-UK.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmltppl9wbxgOqI35GjzT6GemKPuTniyDEB6ph6Rog2TKvAVZmQwbtxh7oMYgPYQjGDvo0Ot02Q_LTN_dDvklAhWz50Gp20Dtxmxie_557ha1WrJMniXqvBYolEwWE0eKGq9dk-Gnqlxw/s1600/15092014_110610.s.121-UK.jpg" height="317" width="320" /></a></div> 755<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Segment of the first Meteor M-N2 image successfully received</span></div> 756<div style="text-align: center;"> 757<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 758<div style="text-align: left;"> 759<span style="font-family: Arial, Helvetica, sans-serif;">The Russians recently (2014) launched the second in the line of Meteor M weather satellites. Meteor M-N2 transmits Low Rate Picture Transmission (<a href="http://en.wikipedia.org/wiki/Low_Rate_Picture_Transmission" target="_blank">LRPT</a>) format pictures round the clock on 137.100Mhz. This format is of higher resolution that the older APT format.</span></div> 760<div style="text-align: left;"> 761<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 762<div style="text-align: left;"> 763<span style="font-family: Arial, Helvetica, sans-serif;">There have been two excellent people helping with software and advice on how to receive images from this satellite. These are Raydel Abreu Espinet, CM2ESP, and Oleg Bekrenev.</span></div> 764<div style="text-align: left;"> 765<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 766<div style="text-align: left;"> 767<span style="font-family: Arial, Helvetica, sans-serif;">Oleg has provided a program to process the captured signal and produce images like the one you see above. Raydel has provided a GNUradio program to capture the signal.</span></div> 768<div style="text-align: left;"> 769<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 770<div style="text-align: left;"> 771<span style="font-family: Arial, Helvetica, sans-serif;">I don't intend to go into detail about what each program does or why as I don'
771t have time but purely to describe how I received the images and offer pointers to Oleg's website where more information is available. The confusing aspect of receiving these images is that there is more than one way of doing it.</span></div> 772<div style="text-align: left;"> 773<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 774<div style="text-align: left;"> 775<span style="font-family: Arial, Helvetica, sans-serif;">So, firstly my equipment:</span></div> 776<div style="text-align: left;"> 777</div> 778<ul> 779<li><span style="font-family: Arial, Helvetica, sans-serif;">Antenna - homebrew QFH antenna</span></li> 780<li><span style="font-family: Arial, Helvetica, sans-serif;">Pre-amp - old Microwave Modules 144Mhz preamp</span></li> 781<li><span style="font-family: Arial, Helvetica, sans-serif;">Receiver - RTL-SDR dongle</span></li> 782<li><span style="font-family: Arial, Helvetica, sans-serif;">Computer running Ubuntu 14.04, xfce windows manager</span></li> 783</ul> 784<div> 785<span style="font-family: Arial, Helvetica, sans-serif;">The strength of the signal from the satellite is not strong and I did not receive a good signal until I added the pre-amp. The RTL dongle has the necessary bandwidth, it may be possible to use an original Funcube Dongle Pro but this only has 92khz of bandwith and this may be too narrow. I am sure a Funcube Dongle Pro+ will work very well. Not only does this have 192khz of bandwidth but the FCD's are both very much more sensitive than the RTL dongles. Other SDR receivers will also work of course.</span></div> 786<div> 787<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 788<div> 789<span style="font-family: Arial, Helvetica, sans-serif;">So, first thing to do is optimise your receiving set-up and adjust the gain of your SDR device using a known signal source. I use London Heathrow ATIS as this transmits all the time. You need to find the sweet spot of your dongle between LNA gain and IF gain, to maximise gain without overloading the SDR. This is crucial, I copied an 88 degree overhead pass on Sunday and only received a short amount of picture. The next day the image you see here was at about 66 degrees elevation and I got very good results. I have a feeling that finding the sweet spot of the gain controls might be difficult.</span></div> 790<div> 791<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 792<div> 793<span style="font-family: Arial, Helvetica, sans-serif;">Once you have optimised your settings use a program like <a href="http://gpredict.oz9aec.net/" target="_blank">GPredict</a>&nbsp;or your favourite satellite tracking program to identify suitable Meteor M-N2 passes.</span></div> 794<div> 795<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 796<div> 797<span style="font-family: Arial, Helvetica, sans-serif;">Use Raydel's GNUradio soft symbol decoder to capture the data stream from the satellite and decode to a format that Oleg's image processing program can understand. Raydel's instructions (and a link to the GNUradio program are <a href="http://meteor.robonuka.ru/wp-content/uploads/2014/08/How-to-receive-Meteor-M.pdf" target="_blank">here</a>, note that this document covers several different method of receiving and decoding the signal).&nbsp;</span></div> 798<div> 799<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 800<div class="separator" style="clear: both; text-align: center;"> 801<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjH67hlO38bfWFWTkLIGwCQOh8lloQPKCgffZacG0wNanTHoeKMpwAn_UNe4ZtOroX0CqW9BME69st7dLAtpzipG3J2rjVTHu6Nqrt3WRWViA6yYkTFYJ6N_ljiUS9NQ8msgE45zzsYGik/s1600/Screenshot+-+140914+-+21_20_43.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjH67hlO38bfWFWTkLIGwCQOh8lloQPKCgffZacG0wNanTHoeKMpwAn_UNe4ZtOroX0CqW9BME69st7dLAtpzipG3J2rjVTHu6Nqrt3WRWViA6yYkTFYJ6N_ljiUS9NQ8msgE45zzsYGik/s1600/Screenshot+-+140914+-+21_20_43.png" height="234" width="320" /></a></div> 802<div> 803<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 804<div style="text-align: center;"> 805<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">The received constellation should look like this is you are receiving the signal correctly.</span></div> 806<div> 807<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 808<div> 809<span style="font-family: Arial, Helvetica, sans-serif;">Once the soft symbol.s file has been received then it is time to open Oleg's <a href="http://meteor.robonuka.ru/soft/" target="_blank">LRPTOffLineDecoder </a>program to produce the image. This is a Windows program but runs well under Wine in Linux.</span></div> 810<div> 811<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 812<div class="separator" style="clear: both; text-align: center;"> 813<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVH3UqZA6W9jE89Pmr374TfOZDYRtvu87Vg-7RpiLzD1BdH8sH71YzbFymBJMehri_Qw6hP2eEJ1NxZdpR-cUSZmO599ZWRaUkB-yzouekdR2uOzIm4HFub3QcccMkG4UnLK-ASW4hw1k/s1600/Capture.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhVH3UqZA6W9jE89Pmr374TfOZDYRtvu87Vg-7RpiLzD1BdH8sH71YzbFymBJMehri_Qw6hP2eEJ1NxZdpR-cUSZmO599ZWRaUkB-yzouekdR2uOzIm4HFub3QcccMkG4UnLK-ASW4hw1k/s1600/Capture.JPG" /></a></div> 814<div class="separator" style="clear: both; text-align: left;"> 815<br /></div> 816<div class="separator" style="clear: both; text-align: left;"> 817<span style="font-family: Arial, Helvetica, sans-serif;">The image above is a part of the window of Oleg's program. If you have captured the signal using the GNUradio program then the processing of the data follows these steps (I think it is different if you have captured the signal in a different way):</span></div> 818<div class="separator" style="clear: both; text-align: left;"> 819</div> 820<ul> 821<li><span style="font-family: Arial, Helvetica, sans-serif;">Click the "72k" button (as the satellite seems to be sending data at a symbol rate of 72k but it has also sent at 80k re
821cently).</span></li> 822<li><span style="font-family: Arial, Helvetica, sans-serif;">Navigate to the place on your hard drive where the .s output file from the GNUradio program is stored, select the file and click ok.</span></li> 823<li><span style="font-family: Arial, Helvetica, sans-serif;">You should see the two progress bars start to move and the constellation of the received signal show in the top left hand side of the window.</span></li> 824<li><span style="font-family: Arial, Helvetica, sans-serif;">This step can take some time.&nbsp;</span></li> 825<li><span style="font-family: Arial, Helvetica, sans-serif;">If the image can be decoded the infrared/visible channels received will be shown to the right hand side.</span></li> 826<li><span style="font-family: Arial, Helvetica, sans-serif;">Click "RGB" to generate a false colour image, you need to select the RGB drop down lists to correspond to the wavelengths that were received otherwise you will just get an all white image. You can also change the RGB settings to change the colouration of the image. At this point you can also save the image.</span></li> 827</ul> 828<div> 829<span style="font-family: Arial, Helvetica, sans-serif;">Oleg's <a href="http://meteor.robonuka.ru/" target="_blank">website</a> has other examples of images received plus links to the software etc.</span></div> 830<div> 831<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 832<div> 833<span style="font-family: Arial, Helvetica, sans-serif;">The picture below is the full image I received on 16/9/14. The white bar occurs every 6.5 minutes and is a programming error of the satellite code that apparently cannot be resolved.&nbsp;</span></div> 834<div class="separator" style="clear: both; text-align: center;"> 835</div> 836<div class="separator" style="clear: both; text-align: center;"> 837<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiW93zTVN9tUCEM5pcsgC3RtNylcVbGHos7t51lDF8dPw3Beqj6JmcTIe1khLFU35C6sMlHxKX6OsbiMCS8LFj16UuHyHP3s4nHgt0ILo41d8gdUDpYNW1JrzW2viw7xlJ9rZISp_khT2c/s1600/15092014_110610.s.121.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiW93zTVN9tUCEM5pcsgC3RtNylcVbGHos7t51lDF8dPw3Beqj6JmcTIe1khLFU35C6sMlHxKX6OsbiMCS8LFj16UuHyHP3s4nHgt0ILo41d8gdUDpYNW1JrzW2viw7xlJ9rZISp_khT2c/s1600/15092014_110610.s.121.jpg" height="320" width="144" /></a></div> 838<div class="separator" style="clear: both; text-align: center;"> 839<br /></div> 840<div class="separator" style="clear: both; text-align: left;"> 841<span style="font-family: Arial, Helvetica, sans-serif;">This is not a soup to nuts description of how to receive these images. You will need to read the instructions produced by Raydel in particular but it should enable you to capture these images quicker than the several weeks that is has taken me to learn how to do it.</span></div> 842<div> 843<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 844<br /> 845<div> 846<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 847</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/8769512979107817303/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/09/receiving-meteor-m-n2-weather-satellite.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/8769512979107817303'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/8769512979107817303'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/09/receiving-meteor-m-n2-weather-satellite.html' title='Receiving Meteor M-N2 weather satellite'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
847<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhmltppl9wbxgOqI35GjzT6GemKPuTniyDEB6ph6Rog2TKvAVZmQwbtxh7oMYgPYQjGDvo0Ot02Q_LTN_dDvklAhWz50Gp20Dtxmxie_557ha1WrJMniXqvBYolEwWE0eKGq9dk-Gnqlxw/s72-c/15092014_110610.s.121-UK.jpg" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-676145779358017957</id><published>2014-08-18T23:59:00.001+01:00</published><updated>2014-08-19T00:01:55.448+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="FreeDV"/><title type='text'>FreeDV - open source digital voice</title><content type='html'><span style="font-family: Arial, Helvetica, sans-serif;">I had been sceptical of digital voice modes as the standards supported by the major manufactures are all&nbsp;proprietary. This will lead to competing 'standards' along the lines of Betamax vs VHS where early adopters are the losers.</span><br /> 848<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 849<span style="font-family: Arial, Helvetica, sans-serif;">Recently I became aware of an open source standard which will work on existing pc's called <a href="http://freedv.org/tiki-index.php" target="_blank">FreeDV</a>.&nbsp;I have also realised that digital voice on HF is no different to RTTY, PSK or JT65 for communicating because those modes are also only able to be decoded by computer. Given the woeful state of my CW I may as well add that to the list as well!&nbsp;</span><br /> 850<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 851<span style="font-family: Arial, Helvetica, sans-serif;">My computer runs Ubuntu 14.04 with the xfce windows manager. There is a FreeDv package available from the FreeDV link above which works with this configuration. I did try to install it on Linux Mint 16 but had problems.</span><br /> 852<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 853<span style="font-family: Arial, Helvetica, sans-serif;">The trickiest part of configuring FreeDV is setting up the sound cards. Two are needed. One can be the standard sound card built into the computer and the other can be the sound card that is built into a USB headset (headphones and microphone).</span><br /> 854<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 855<span style="font-family: Arial, Helvetica, sans-serif;">To configure the 4 inputs and outputs I needed to use alsamixer and pavucontrol (both available from the Ubuntu Softw
855are Centre).</span><br /> 856<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 857<br /> 858<div class="separator" style="clear: both; text-align: center;"> 859<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhi7dAC0GjZw3WpMOhyphenhyphencnyqWcmipfuhR2RSqYSbEZeNOK62n3MJX7lueo1bMTa64Wa5vp8jGDfh0ue8NqEMZ6Uj6ICAejAveA4T57xD0MJkyaC810NKxnCYUssh_3OXRyt_LGI6zLSyEIQ/s1600/alsamixer+s1c.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhi7dAC0GjZw3WpMOhyphenhyphencnyqWcmipfuhR2RSqYSbEZeNOK62n3MJX7lueo1bMTa64Wa5vp8jGDfh0ue8NqEMZ6Uj6ICAejAveA4T57xD0MJkyaC810NKxnCYUssh_3OXRyt_LGI6zLSyEIQ/s1600/alsamixer+s1c.jpg" height="75" width="320" /></a></div> 860<div class="separator" style="clear: both; text-align: center;"> 861<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">alsamixer setup for the internal sound card used for the audio input from radio to computer (using the computer line in socket) (1) Note that 'Input source' is set to the input you are using to get audio from the radio and 'Capture' is used to set the level for that input source.</span></div> 862<div class="separator" style="clear: both; text-align: center;"> 863<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 864<div class="separator" style="clear: both; text-align: center;"> 865<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQrAI8eXP9qniw-r_YwCVxvBcKUt8N8f_sR67RmBzabMMYLN2fyulZ5gx-bkSw9yhM2iRk5diW6L2w5fNDgQ8aipvqf8spZuoQHystG9qlyB6xVrwnw07GarSCDBVBQ3vrCBWYr7NBXjk/s1600/alsamixer+s2p.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiQrAI8eXP9qniw-r_YwCVxvBcKUt8N8f_sR67RmBzabMMYLN2fyulZ5gx-bkSw9yhM2iRk5diW6L2w5fNDgQ8aipvqf8spZuoQHystG9qlyB6xVrwnw07GarSCDBVBQ3vrCBWYr7NBXjk/s1600/alsamixer+s2p.jpg" height="73" width="320" /></a></div> 866<div style="text-align: center;"> 867&nbsp;<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">alsamixer setup for the Logitech headset headphones (2)</span></div> 868<div style="text-align: center;"> 869<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 870<div class="separator" style="clear: both; text-align: center;"> 871<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgygFaRZw52MyI2HdUUxl7Tp6_t8phihvW_cEnNYfUFVcrP6jreQNCit2X0lZOYxH__Bi_B95ECBEA8h76QTWpQr4hHURUBl_l51EBvXTDhH9q9rdfpP7czsesquDKxDdUwdolWw3_uxeg/s1600/alsamixer+s2c.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgygFaRZw52MyI2HdUUxl7Tp6_t8phihvW_cEnNYfUFVcrP6jreQNCit2X0lZOYxH__Bi_B95ECBEA8h76QTWpQr4hHURUBl_l51EBvXTDhH9q9rdfpP7czsesquDKxDdUwdolWw3_uxeg/s1600/alsamixer+s2c.jpg" height="72" width="320" /></a></div> 872<div style="text-align: center;"> 873<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">alsamixer setup for the Logitech headset microphone (3)</span></div> 874<div style="text-align: center;"> 875<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 876<div class="separator" style="clear: both; text-align: center;"> 877<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgETqOQ5WfvphpScFwJfqvvwflOm-XCBXktBZMQ60EPiUZ-PVo_ojwSjx92rJb5DocVd1kbqQDchf9B9ux5yX-Xc0jJRo_x1w3jN100573VjoTQrG231zvLRh0sEhKOSacU6rRkeokhw7g/s1600/als
877amixer+s1p.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgETqOQ5WfvphpScFwJfqvvwflOm-XCBXktBZMQ60EPiUZ-PVo_ojwSjx92rJb5DocVd1kbqQDchf9B9ux5yX-Xc0jJRo_x1w3jN100573VjoTQrG231zvLRh0sEhKOSacU6rRkeokhw7g/s1600/alsamixer+s1p.jpg" height="85" width="320" /></a></div> 878<div class="" style="clear: both; text-align: center;"> 879<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">alsamixer setup for the internal sound card used for the audio output from computer to radio (to be honest I don't know which setting is used here but the socket on the computer is audio out) (4)</span></div> 880<br /> 881<div style="text-align: center;"> 882&nbsp;<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEdNMofcXiMcnBAmmCqRZSfJpdk5tpn2BHrzbuap7ZTQb1j-RgRM1qA7LcEGnp0hayA2Zk0RTmuceT_02Kg40oy6wvd9V5DlDs01nd1ixJCbglj8ZNaRsdTw2JbeRfeP1NgkflQYCP3Hs/s1600/audio+settings+rx1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjEdNMofcXiMcnBAmmCqRZSfJpdk5tpn2BHrzbuap7ZTQb1j-RgRM1qA7LcEGnp0hayA2Zk0RTmuceT_02Kg40oy6wvd9V5DlDs01nd1ixJCbglj8ZNaRsdTw2JbeRfeP1NgkflQYCP3Hs/s1600/audio+settings+rx1.jpg" height="224" width="320" /></a></div> 883<div style="text-align: center;"> 884<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">This is the FreeDV audio configuration screen corresponding to screenshots 1 &amp; 2 above</span></div> 885<br /> 886<div class="separator" style="clear: both; text-align: center;"> 887<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIVogippPg-frLdCm-hTfHfq1o-4S5UUqIwlpfzPKIZIEPo0PyyOZs0zOeYnZSDsbMv97EtkJXEdgOT-VLC4BtAJnO5mgs-oZ8Qricp1P_kWiC-tbM7_PC88DCjKf3_VK48Au16cIoZ98/s1600/audio+settings+tx1.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiIVogippPg-frLdCm-hTfHfq1o-4S5UUqIwlpfzPKIZIEPo0PyyOZs0zOeYnZSDsbMv97EtkJXEdgOT-VLC4BtAJnO5mgs-oZ8Qricp1P_kWiC-tbM7_PC88DCjKf3_VK48Au16cIoZ98/s1600/audio+settings+tx1.jpg" height="224" width="320" /></a></div> 888<div class="separator" style="clear: both; text-align: center;"> 889<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">This is the FreeDV audio configuration screen corresponding to screenshots 3 &amp; 4 above</span></div> 890<div class="separator" style="clear: both; text-align: center;"> 891<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 892<div class="separator" style="clear: both; text-align: left;"> 893<span style="font-family: Arial, Helvetica, sans-serif;">I also had to use pavucontrol (PulseAudio) to adjust the transmitted audio so it isn't over driving the radio, although I haven't experimented enough to see if I could also do this using alsamixer. I think I should be able to.</span></div> 894<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 895<span style="font-family: Arial, Helvetica, sans-serif;">I have a Yaesu FT-920 and the audio in/out from the computer is connected to the data port along with the USB-serial CAT cable for PTT control.</span><br /> 896<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 897<br /> 898<div class="separator" style="clear: both; text-align: center;"> 899<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnCLJN4UFnCLbHIy0yL75rPw4IRb7rs_Kh-R3uZRxBXAkpuelnqRgrKJLYZ0Bz-9f9bqrGeb3F7C5BC8vboNGjXaHlXQnLnwMisUymXBMMSpkFtorD062xhyeeudncrdQKtCHAsrjJxHw/s1600/freeDV.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhnCLJN4UFnCLbHIy0yL75rPw4IRb7rs_Kh-R3uZRxBXAkpuelnqRgrKJLYZ0Bz-9f9bqrGeb3F7C5BC8vboNGjXaHlXQnLnwMisUymXBMMSpkFtorD062xhyeeudncrdQKtCHAsrjJxHw/s1600/freeDV.jpg" height="246" width="320" /></a></div> 900<div style="text-align: center;"> 901<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">What the FreeDV waterfall looks like without a digital signal being received.</span></div> 902<div style="text-align: center;"> 903<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 904<div style="text-align: left;"> 905<span style="font-family: Arial, Helvetica, sans-serif;">That's it for now, there are more instructions for setting up and using FreeDV <a href="http://freedv.org/tiki-index.php" target="_blank">here</a>.</span></div> 906<div style="text-align: left;"> 907<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 908<div style="text-align: left;"> 909<span style="font-family: Arial, Helvetica, sans-serif;">If you would like to set up a sked please let me know, my email is on the top right of this blog or on QRZ.com (G0FCU).</span></div> 910<div style="text-align: left;"> 911<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 912</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/676145779358017957/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/08/freedv-open-source-digital-voice.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/676145779358017957'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/676145779358017957'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/08/freedv-open-source-digital-voice.html' title='FreeDV - open source digital voice'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
912<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhi7dAC0GjZw3WpMOhyphenhyphencnyqWcmipfuhR2RSqYSbEZeNOK62n3MJX7lueo1bMTa64Wa5vp8jGDfh0ue8NqEMZ6Uj6ICAejAveA4T57xD0MJkyaC810NKxnCYUssh_3OXRyt_LGI6zLSyEIQ/s72-c/alsamixer+s1c.jpg" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-2668707254973884373</id><published>2014-06-16T18:21:00.000+01:00</published><updated>2014-06-24T13:57:21.351+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="Antenna"/><category scheme="http://www.blogger.com/atom/ns#" term="arduino"/><title type='text'>Arduino Antenna Analyser</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 913<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUUv2w7NLwjYyy35k4X-W7E1NllV2Lya1aAuKI3dY1k1Xk7hfcgfRWXo8Gza1lWVxxrD49bCZSoonn7YBmaui6toyefdhSfpCUKSIUP40vJw5uy6xeVcshzpICr8WggHZMw8jhHvc5z-0/s1600/invlaa.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUUv2w7NLwjYyy35k4X-W7E1NllV2Lya1aAuKI3dY1k1Xk7hfcgfRWXo8Gza1lWVxxrD49bCZSoonn7YBmaui6toyefdhSfpCUKSIUP40vJw5uy6xeVcshzpICr8WggHZMw8jhHvc5z-0/s1600/invlaa.png" height="210" width="320" /></a></div> 914<div style="text-align: center;"> 915<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">Inverted-L SWR plot</span></div> 916<div style="text-align: center;"> 917<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 918<div style="text-align: left;"> 919<span style="font-family: Arial, Helvetica, sans-serif;">The alternative title for this post could be "Even more fun with antennas"!&nbsp;</span></div> 920<div style="text-align: left;"> 921<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 922<div style="text-align: left;"> 923<span style="font-family: Arial, Helvetica, sans-serif;">I know that the inverted-L that I <a href="http://photohamrad.blogspot.co.uk/2014/05/spring-fun-with-antennas.html" target="_blank">erected</a> recently resonates on the bands that I wanted it too (i.e. 10/14/18Mhz) but tuning wire antennas to resonance always involves a lot of running between ends of the antenna and rig, taking notes of SWR achieved at specific frequencies and working out whether to shorten or&nbsp;lengthen the wire.&nbsp;</span></div> 924<div style="text-align: left;"> 925<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 926<div style="text-align: left;"> 927<span style="font-family: Arial, Helvetica, sans-serif;">An antenna analyser can help reduce some of this effort as you get a graph of SWR plotted against frequency. However, these cost upwards of £200. Now bring to the table the ubiquitous Arduino, my favourite '<strike>toy</strike>' tool of the moment.</span></div> 928<div style="text-align: left;"> 929<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 930<div style="text-align: left;"> 931<span style="font-family: Arial, Helvetica, sans-serif;">I found several designs for antenna analysers based on Arduino's but I think it was someone on Twitter who pointed me to the design by <a href="http://www.hamstack.com/project_antenna_analyzer.html" target="_blank">K6BEZ</a>. If you have an Arduino and a few resistors this is really cheap to make. I had to buy the diodes and the op-amp, but these cost me less than £10 on e-bay with an op-amp and about 10 diodes to spare.</span></div> 932<div style="text-align: left;"> 933<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 934<div style="text-align: left;"> 935<span style="font-family: Arial, Helvetica, sans-serif;">
935Fortunately I also found <a href="http://mattgumbley.wordpress.com/category/amateur-radio/" target="_blank">Matt Gumbley's</a> website and Matt has designed a Veroboard layout for the K6BEZ circuit. This made building the circuit very simple and it worked first time for me. I didn't have any 50 ohm or 648 ohm resistors so I used a 27R and 22R in series (49R) in place of the 50R resistors and a 470R &amp; 180R in series (650R) in place of the 648R resistors.</span></div> 936<div style="text-align: left;"> 937<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 938<div style="text-align: left;"> 939<span style="font-family: Arial, Helvetica, sans-serif;">Setting the frequency range to scan involves entering the commands below via the Arduino serial monitor. The key commands in the Arduino sketch are:</span></div> 940<div style="text-align: left;"> 941</div> 942<ul> 943<li><span style="font-family: Courier New, Courier, monospace;"><i>frequency</i>A</span><i style="font-family: Arial, Helvetica, sans-serif;"> - </i><span style="font-family: Arial, Helvetica, sans-serif;">set the frequency to start the scan from, in Hz.</span></li> 944<li><span style="font-family: Courier New, Courier, monospace;"><i>frequency</i>B</span><span style="font-family: Arial, Helvetica, sans-serif;">&nbsp;- set the frequency to end the scan at, in Hz.</span></li> 945<li><span style="font-family: Courier New, Courier, monospace;"><i>steps</i>N</span><span style="font-family: Arial, Helvetica, sans-serif;">&nbsp;- set the number of steps for the scan</span></li> 946<li><span style="font-family: Courier New, Courier, monospace;">?</span><span style="font-family: Arial, Helvetica, sans-serif;"> - displays the parameters that have been set</span></li> 947<li><span style="font-family: Courier New, Courier, monospace;">S</span><span style="font-family: Arial, Helvetica, sans-serif;"> or </span><span style="font-family: Courier New, Courier, monospace;">s - </span><span style="font-family: Arial, Helvetica, sans-serif;">start the scan</span></li> 948</ul> 949<div> 950<span style="font-family: Arial, Helvetica, sans-serif;">e.g. 12000000A sets the start frequency to 12Mhz.</span><br /> 951<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 952<span style="font-family: Arial, Helvetica, sans-serif;">For a 1Mhz to 30Mhz scan I use 2000 steps.</span><br /> 953<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 954<span style="font-family: Arial, Helvetica, sans-serif;">The results are returned to the serial monitor and in the default sketch are:</span></div> 955<div> 956<ul> 957<li><span style="font-family: Arial, Helvetica, sans-serif;">frequency,0,swr,forward voltage, reverse voltage</span></li> 958</ul> 959<div> 960<span style="font-family: Arial, Helvetica, sans-serif;">To get the graphs shown here I have simply copied the data into a spreadsheet, converted the frequency to MHz by dividing by 1000000, and divided the SWR by 1000. I have then used gnuplot to create the graphs.</span></div> 961</div> 962<div> 963<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 964<div> 965<span style="font-family: Arial, Helvetica, sans-serif;">The gnuplot commands I used are:</span></div> 966<div> 967<span style="font-family: Courier New, Courier, monospace;">set term canvas size 600,400</span></div> 968<div> 969<div> 970<span style="font-family: Courier New, Courier, monospace;">set output "g5rv.html"</span></div> 971<div> 972<span style="font-family: Courier New, Courier, monospace;">set linetype 1 lw 1 lc rgb "blue" pointtype 0</span></div> 973<div> 974<span style="font-family: Courier New, Courier, monospace;">set xlabel 'Frequency (MHz)'</span></div> 975<div> 976<span style="font-family: Courier New, Courier, monospace;">set ylabel 'SWR'</span></div> 977<div> 978<span style="font-family: Courier New, Courier, monospace;">set xtics scale 2,1</span></div> 979<div> 980<span style="font-family: Courier New, Courier, monospace;">set mxtics 5</span></div> 981<div> 982<span style="font-family: 'Courier New', Courier, monospace;">plot 'data' smooth bezier title 'G5RV antenna'</span></div> 983<div> 984<span style="font-family: Courier New, Courier, monospace;"><br /></span> 985<span style="font-family: Arial, Helvetica, sans-serif;">Line 2 sets the output filename &nbsp;to 'g5rv.html'.</span><br /> 986<span style="font-family: Arial, Helvetica, sans-serif;">Line 8 loads the data from a file called 'data' (frequency and swr, one pair of data values per line, separated by a space) and give the output the title 'G5RV antenna'.</span></div> 987</div> 988<div> 989<span style="font-family: Courier New, Courier, monospace; font-size: x-small;"><br /></span></div> 990<div class="separator" style="clear: both; text-align: center;"> 991<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgH747Bkh_9jt6azAe70VC6JVFumExUB9kutwaGfSDUK-Ku6_zvf_sOvL0_J8GU05TBlGUow_GmJkXwgRU1WMPPlE_u7FX0FPLYLZdxfTxaQEpzw2y86fh4RagpXRm_XMsCtupLKOkOIMY/s1600/g5rvaa.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgH747Bkh_9jt6azAe70VC6JVFumExUB9kutwaGfSDUK-Ku6_zvf_sOvL0_J8GU05TBlGUow_GmJkXwgRU1WMPPlE_u7FX0FPLYLZdxfTxaQEpzw2y86fh4RagpXRm_XMsCtupLKOkOIMY/s1600/g5rvaa.png" height="205" width="320" /></a></div> 992<div style="text-align: center;"> 993<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">G5RV SWR plot</span></div> 994<div class="separator" style="clear: both; text-align: center;"> 995<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1L3vNIN9olGc4Z3S5hnBbQ2eKZrq-QFFV8-gkYOVfiLvXoo6lXW1gFDAGlunNLgQICNKmHsZVP6QTlMk4an4oKfM_hn0wROv1DGvkXYUpJtfN7gaOD68bWktBUMc7-j5DFJ-qp92YDXs/s1600/5mhzdipoleaa.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh1L3vNIN9olGc4Z3S5hnBbQ2eKZrq-QFFV8-gkYOVfiLvXoo6lXW1gFDAGlunNLgQICNKmHsZVP6QTlMk4an4oKfM_hn0wROv1DGvkXYUpJtfN7gaOD68bWktBUMc7-j5DFJ-qp92YDXs/s1600/5mhzdipoleaa.png" height="205" width="320" /></a></div> 996<div style="text-align: center;"> 997<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">5 MHz dipole SWR plot</span></div> 998<div style="text-align: center;"> 999<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 1000<div style="text-align: left;"> 1001<span style="font-family: Arial, Helvetica, sans-serif;">What this shows me is that my G5RV resonates slightly higher in frequency than the 80m &amp; 40m amateur bands but that my 5 MHz dipole and the Inverted-L resonate exactly where I want them to.</span></div> 1002<div style="text-align: left;"> 1003<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1004<div style="text-align: left;"> 1005<span style="font-family: Arial, Helvetica, sans-serif;">Even better is that I have got an antenna analyser for less than the price of a pint of beer. Cheers!</span></div> 1006<div style="text-align: left;"> 1007<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1008</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/2668707254973884373/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/06/arduino-antenna-analyser.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/2668707254973884373'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/2668707254973884373'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/06/arduino-antenna-analyser.html' title='Arduino Antenna Analyser'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
1008<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjUUv2w7NLwjYyy35k4X-W7E1NllV2Lya1aAuKI3dY1k1Xk7hfcgfRWXo8Gza1lWVxxrD49bCZSoonn7YBmaui6toyefdhSfpCUKSIUP40vJw5uy6xeVcshzpICr8WggHZMw8jhHvc5z-0/s72-c/invlaa.png" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-3762463183059034967</id><published>2014-06-03T21:44:00.000+01:00</published><updated>2014-06-03T21:44:15.021+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="Antenna"/><category scheme="http://www.blogger.com/atom/ns#" term="wspr"/><title type='text'>WSPR comparison between Inverted-L and G5RV</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 1009<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirjxGf2cXJqb511hGIXrYTSVC2L1-SB76pcgN-_tPZ7QnaRcGYi0nTdTs_fdJpjivrHBFngdq197shZyoNGnOW3HP3MbLRCwDlvWoIH4Wge_Iob3Xfrfolhc2WTb8uBZJ1Iek5Ml0htfw/s1600/wspr-20m-inv-L.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirjxGf2cXJqb511hGIXrYTSVC2L1-SB76pcgN-_tPZ7QnaRcGYi0nTdTs_fdJpjivrHBFngdq197shZyoNGnOW3HP3MbLRCwDlvWoIH4Wge_Iob3Xfrfolhc2WTb8uBZJ1Iek5Ml0htfw/s1600/wspr-20m-inv-L.png" height="191" width="320" /></a></div> 1010<div style="text-align: center;"> 1011<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">WSPR spots using 5W on 20m with my Inverted-L</span></div> 1012<div style="text-align: center;"> 1013<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;"><br /></span></div> 1014<div style="text-align: left;"> 1015<span style="font-family: Arial, Helvetica, sans-serif;">I managed to get wsprx working in receive mode on my new installation of Linux Mint 16. The realtime waterfall makes it much easier to ensure that your radio is accurately set to receive in the wspr sub-band. I found that my FT920 reads about 40Hz low as a result. However, it crashes when coming out of transmit mode. Consequently, I installed the older version wspr 2.0. This also had a problem with one of the Python libraries but there was a fix documented on the wsprnet.org website.</span></div> 1016<div style="text-align: left;"> 1017<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1018<div class="separator" style="clear: both; text-align: center;"> 1019<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWRi6UfgIoFZPX1qfPIy9m1tzoCrw294n0JYdXe52JcCvwarJCUXMDifiOchVyiktE9IcSUsgy6eeXV_HdD8QzQLmgYzgYG2Vp5-RlZbd0GGypDslf36_OD8TcN9-rZfIjfgjKBh8Tveo/s1600/wsprx.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiWRi6UfgIoFZPX1qfPIy9m1tzoCrw294n0JYdXe52JcCvwarJCUXMDifiOchVyiktE9IcSUsgy6eeXV_HdD8QzQLmgYzgYG2Vp5-RlZbd0GGypDslf36_OD8TcN9-rZfIjfgjKBh8Tveo/s1600/wsprx.png" height="137" width="320" /></a></div> 1020<div style="text-align: center;"> 1021<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">The waterfall used in wsprx</span></div> 1022<div style="text-align: left;"> 1023<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1024<div style="text-align: left;"> 1025<span style="font-family: Arial, Helvetica, sans-serif;">This means that I can now run wspr with a little more power than previously, my broadband HF amplifier only produces about 0.5W. I have been wspr'ing with 5W and the results using my new <a href="http://photohamrad.blogspot.co.uk/2014/05/spring-fun-with-antennas.html" target="_blank">inverted-L</a> you can see in the screenshot at the top of the page. I am amazed at how far 5W will reach. However, it is a little too easy, on my first transmission my signal was received by KK7UQ on the west coast of the USA.</span></div> 1026<div style="text-align: left;"> 1027<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1028<div style="text-align: left;"> 1029<span style="font-family: Arial, Helvetica, sans-serif;">After an hour wspr'ing on the inverted-L I switched to my G5RV and the difference is considerable. Although the G5RV is higher than the inverted-L (around 12m versus 6m high) one leg runs E-W and the other leg NW-SE. The inverted-L runs SE-NW pointing directly at north America. The resulting wspr spots from the G5RV are below.</span></div> 1030<div style="text-align: left;"> 1031<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1032<div class="separator" style="clear: both; text-align: center;"> 1033<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghUOWdIqIiJStYdnn0I7WqIzz7wdRZkNoh-O5EXMybo98GcjxU3zUecgV9UR277UELteeb-A_WcCYJ8dazC8VKIU-FZ7WRkQNlRT571Rup7KlviWYR3bODZmcC5RKPkdtlilw2i-aU8Fo/s1600/wspr-20m-g5rv.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEghUOWdIqIiJStYdnn0I7WqIzz7wdRZkNoh-O5EXMybo98GcjxU3zUecgV9UR277UELteeb-A_WcCYJ8dazC8VKIU-FZ7WRkQNlRT571Rup7KlviWYR3bODZmcC5RKPkdtlilw2i-aU8Fo/s1600/wspr-20m-g5rv.png" height="198" width="320" /></a></div> 1034<div style="text-align: center;"> 1035<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">WSPR spots using 5W on 20m with my G5RV</span></div> 1036<div style="text-align: center;"> 1037<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1038<div style="text-align: left;"> 1039<span style="font-family: Arial, Helvetica, sans-serif;">Interestingly I received VK3HAD equally well on both antennas and KK7UQ received me equally well until dusk fell when a few more US stations heard me and were heard by me.&nbsp;</span></div> 1040<div style="text-align: left;"> 1041<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1042<div style="text-align: left;"> 1043<span style="font-family: Arial, Helvetica, sans-serif;">Along the greyline I was heard by ZL3DMH at 19016km distance.</span></div> 1044<div style="text-align: left;"> 1045<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1046<div style="text-align: left;"> 1047<span style="font-family: Arial, Helvetica, sans-serif;">This isn't a scientific test, by any stretch of the imagination but very interesting none the less. However, what it has shown me is that 5W and wire antennas equals QRO in wspr terms!</span></div> 1048</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/3762463183059034967/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/06/wspr-comparison-between-inverted-l-and.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/3762463183059034967'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/3762463183059034967'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/06/wspr-comparison-between-inverted-l-and.html' title='WSPR comparison between Inverted-L and G5RV'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
1048<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEirjxGf2cXJqb511hGIXrYTSVC2L1-SB76pcgN-_tPZ7QnaRcGYi0nTdTs_fdJpjivrHBFngdq197shZyoNGnOW3HP3MbLRCwDlvWoIH4Wge_Iob3Xfrfolhc2WTb8uBZJ1Iek5Ml0htfw/s72-c/wspr-20m-inv-L.png" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5343352982415995506</id><published>2014-05-26T10:04:00.000+01:00</published><updated>2014-05-26T10:04:43.719+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="Antenna"/><category scheme="http://www.blogger.com/atom/ns#" term="wspr"/><title type='text'>Inverted L and results from WSPR</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 1049<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3bJRTXzWnvv9otgNsnJokd0tHwYN90OcraEU88DDpFQ7RlIk9WhAZnLTN3pnqh73pjAqBSnWvLPbEKX_wvC7ThB1ryY30ifAAUNHdY_0tU1Zsj5jXIJMewzpfGiRyDF4GsB8RbSJ25j8/s1600/_20140526_090957.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3bJRTXzWnvv9otgNsnJokd0tHwYN90OcraEU88DDpFQ7RlIk9WhAZnLTN3pnqh73pjAqBSnWvLPbEKX_wvC7ThB1ryY30ifAAUNHdY_0tU1Zsj5jXIJMewzpfGiRyDF4GsB8RbSJ25j8/s1600/_20140526_090957.JPG" height="167" width="320" /></a></div> 1050<br /> 1051<span style="font-family: Arial, Helvetica, sans-serif;">Good results with my new Inverted-L overnight. Running 500mW I got multiple decodes from the stations you can see on the map above.</span><br /> 1052<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 1053<span style="font-family: Arial, Helvetica, sans-serif;">The tx is the same homebrew amplifier that I have used previously so the antenna is the only item I have changed. With my other antenna, a G5RV, I had only been received once in the USA.</span><br /> 1054<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 1055<span style="font-family: Arial, Helvetica, sans-serif;">Overall this confirms my initial findings that the Inverted-L pointing at north America is performing very well.</span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5343352982415995506/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/05/inverted-l-and-results-from-wspr.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5343352982415995506'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5343352982415995506'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/05/inverted-l-and-results-from-wspr.html' title='Inverted L and results from WSPR'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi3bJRTXzWnvv9otgNsnJokd0tHwYN90OcraEU88DDpFQ7RlIk9WhAZnLTN3pnqh73pjAqBSnWvLPbEKX_wvC7ThB1ryY30ifAAUNHdY_0tU1Zsj5jXIJMewzpfGiRyDF4GsB8RbSJ25j8/s72-c/_20140526_090957.JPG" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-7718849550548942281</id><published>2014-05-25T23:41:00.001+01:00</published><updated>2014-05-26T00:12:26.643+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="4m"/><category scheme="http://www.blogger.com/atom/ns#" term="70Mhz"/><category scheme="http://www.blogger.com/atom/ns#" term="contest"/><title type='text'>4 metres contest</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 1056<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh17w0xM5RJveTy5js4BApu7zPYoQA3c4d5rpaxFxCkTZWi7XPXqkvdlU46XoNNXA3K-MJM4TRoK-7u83zM2DRDMjHwIcT4bLhIdAzAH-j8lP3ELZ_eD5gd1gyibVPQjrLOa_OAko3AcBc/s1600/Screenshot+from+2014-05-25+22:11:35.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh17w0xM5RJveTy5js4BApu7zPYoQA3c4d5rpaxFxCkTZWi7XPXqkvdlU46XoNNXA3K-MJM4TRoK-7u83zM2DRDMjHwIcT4bLhIdAzAH-j8lP3ELZ_eD5gd1gyibVPQjrLOa_OAko3AcBc/s1600/Screenshot+from+2014-05-25+22:11:35.png" height="175" width="320" /></a></div> 1057<div style="text-align: center;"> 1058<span style="font-family: Arial, Helvetica, sans-serif; font-size: xx-small;">Screenshot of my QSO's in the 70Mhz Cumulative contest on &nbsp;25 May 2014</span></div> 1059<br /> 1060<span style="font-family: Arial, Helvetica, sans-serif;">Many years ago I participated in many VHF and UHF contests with the G4VAT contest group so I sort of got drawn into this 70Mhz contest today. I have described my new 70Mhz elsewhere on this blog and this was a good opportunity to give it a good try out with my homebuilt Moxon Rectangle antenna.</span><br /> 1061<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 1062<span style="font-family: Arial, Helvetica, sans-serif;">The result was that I worked all the stations that I heard, except one who was a long 230 miles away. He heard me on an aircraft reflection but it didn't last long enough for a full exchange.</span><br /> 1063<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 1064<span style="font-family: Arial, Helvetica, sans-serif;">
1064I was pleased to note that most signal reports I received were reciprocal to those that I gave out. There was deep QSB on most signals and comments made by stations who have submitted logs also note the QSB and generally poor conditions.</span><br /> 1065<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span> 1066<span style="font-family: Arial, Helvetica, sans-serif;">Here is a link to my contest QSO's in an interactive&nbsp;<a href="https://www.google.co.uk/maps/@51.571755,-2.0374556,9z/data=!4m2!6m1!4s207646575154664283439.0004fa3f54fb7f34d9456" target="_blank">Google map</a></span><br /> 1067<br /> 1068<span style="font-family: Arial, Helvetica, sans-serif;">I have just submitted my log to the RSGB contest committee site and I have claimed the grand total of 825 points!</span></content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/7718849550548942281/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/05/4-metres-contest.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/7718849550548942281'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/7718849550548942281'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/05/4-metres-contest.html' title='4 metres contest'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author><media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh17w0xM5RJveTy5js4BApu7zPYoQA3c4d5rpaxFxCkTZWi7XPXqkvdlU46XoNNXA3K-MJM4TRoK-7u83zM2DRDMjHwIcT4bLhIdAzAH-j8lP3ELZ_eD5gd1gyibVPQjrLOa_OAko3AcBc/s72-c/Screenshot+from+2014-05-25+22:11:35.png" height="72" width="72"/><thr:total>0</thr:total></entry><entry><id>tag:blogger.com,1999:blog-7750735187888945261.post-5372957062968788260</id><published>2014-05-21T23:33:00.000+01:00</published><updated>2014-05-21T23:42:09.702+01:00</updated><category scheme="http://www.blogger.com/atom/ns#" term="Antenna"/><title type='text'>Spring fun with antennas</title><content type='html'><div class="separator" style="clear: both; text-align: center;"> 1069<img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2UCf6g6GJ8-dxnXKPg2VD3ilzVPoZIIsnrxp1fF65skBZVryrbB-pcQa9oiMXmAdh03lM52PD9YcTVACxjQ0_s4f5K338Ru-b5h-e7tQnJzXQg1M1ragN_KXAdGkvb-fIqiaF5-rVLJs/s1600/IMG_20140517_143830.jpg" height="240" width="320" /></div> 1070<div style="text-align: center;"> 1071<span style="font-family: Arial, Helvetica, sans-serif; font-size: x-small;">The part built 4:1 balun</span></div> 1072<div style="text-align: center;"> 1073<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1074<div style="text-align: left;"> 1075<span style="font-family: Arial, Helvetica, sans-serif;">The May weather was very warm at the weekend and so I took the opportunity to put another antenna up. I spent some time trying to decide what to build but eventually decided that anything was better than nothing and just got on with it.</span></div> 1076<div style="text-align: left;"> 1077<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1078<div style="text-align: left;"> 1079<span style="font-family: Arial, Helvetica, sans-serif;">For some time I had thought about erecting the Inverted-L described&nbsp;<a href="http://www.hamuniverse.com/slopinginvl.html" target="_blank">here</a>&nbsp;
1079cut for the 30/20/17m bands. First though I needed a 4:1balun. I built one described on the website of&nbsp;<a href="http://www.m0zpk.co.uk/4-1-balun/" target="_blank">M0ZPK</a></span></div> 1080<div style="text-align: left;"> 1081<br /></div> 1082<div style="text-align: left;"> 1083<span style="font-family: Arial, Helvetica, sans-serif;">I then retrieved from the shed a roll of 32 gauge wire given to me by a work colleague some years ago. I suspect this wire is quite old as it is manufactured by WL Gore, who are now rather more famous as the manufacturer of the waterproof material GoreTex.</span></div> 1084<div style="text-align: left;"> 1085<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1086<div class="separator" style="clear: both; text-align: center;"> 1087<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8QKJdTdvIHTowjP4G0mZy6MHr3-aW3me5mSiET4PSE4Wmv4gvrvQlFAxlLBLdLJKbInPFbKMj7sD8MqstZ5AlHiyUsgyWbuG2mN_VgKNUssfzobpbfJnoiXZ1cB8mEkG5l0yG8smVIbs/s1600/2014-05-18+17.09.02.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh8QKJdTdvIHTowjP4G0mZy6MHr3-aW3me5mSiET4PSE4Wmv4gvrvQlFAxlLBLdLJKbInPFbKMj7sD8MqstZ5AlHiyUsgyWbuG2mN_VgKNUssfzobpbfJnoiXZ1cB8mEkG5l0yG8smVIbs/s1600/2014-05-18+17.09.02.jpg" height="181" width="320" /></a></div> 1088<div style="text-align: left;"> 1089<br /></div> 1090<div style="text-align: left;"> 1091<span style="font-family: Arial, Helvetica, sans-serif;">This wire is so thin as to render it almost invisible, which makes it difficult to erect but pleasing on the eye in the longer term. I am sure it won't last a winter but it was free so is great for experimentation.</span></div> 1092<div style="text-align: left;"> 1093<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1094<div style="text-align: left;"> 1095<span style="font-family: Arial, Helvetica, sans-serif;">The inverted L was hoisted about 7m into a tree in one corner of the garden with the top running down to a smaller tree at the front of our property. Here I had to bend the final few metres (of 37 metres) to make it fit. The antenna was immediately a good match on 15/12/10m, which was annoying as I was trying for 30/20/17m.</span></div> 1096<div style="text-align: left;"> 1097<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1098<div style="text-align: left;"> 1099<span style="font-family: Arial, Helvetica, sans-serif;">I fiddled around with it for a while (and actually shortened it so there is now no bend in it, but it still didn't resonate on the desired bands) before leaving it for the night. The next day I relocated the balun closer to the ground and the stream that runs along the back of the garden. Hey presto, a 1.1:1 match on 30/20/17m was achieved. Obviously the antenna elves had been out during the night and tuned it to resonance for me! I can only think that changing the angle of the more vertical part of the antenna had a significant effect.</span></div> 1100<div style="text-align: left;"> 1101<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1102<div class="separator" style="clear: both; text-align: center;"> 1103<a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjib3A6hYwfftk0tsmRfkI2XyNeXHEFVZvef4ab0TuZmsPiyW3iUql-9BUDQ8vIPpyZSg09BspJ0bsRIMiTEX0YVjX_X45SxsdwxIVvZc4gaIwpDZIY21wYm7Fkk2CI2BfjoP1SXdxU4k8/s1600/2014-05-18+17.11.00.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjib3A6hYwfftk0tsmRfkI2XyNeXHEFV
1103Zvef4ab0TuZmsPiyW3iUql-9BUDQ8vIPpyZSg09BspJ0bsRIMiTEX0YVjX_X45SxsdwxIVvZc4gaIwpDZIY21wYm7Fkk2CI2BfjoP1SXdxU4k8/s1600/2014-05-18+17.11.00.jpg" height="181" width="320" /></a></div> 1104<div style="text-align: left;"> 1105<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1106<div style="text-align: left;"> 1107<span style="font-family: Arial, Helvetica, sans-serif;">The result is an antenna that is directed towards north America&nbsp;</span><span style="font-family: Arial, Helvetica, sans-serif;">and I can hear Canadian and US stations on it that are several S points down on my more elevated G5RV.</span></div> 1108<div style="text-align: left;"> 1109<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1110<div style="text-align: left;"> 1111<span style="font-family: Arial, Helvetica, sans-serif;">So I am classifying this as a great success, and it has caused me to have more QSO's which is even better. Here are a couple of videos showing the difference between the inverted L and the G5RV, the G5RV is antenna A and the inverted L is antenna B. The antenna input selected is shown to the top right of the frequency display. OK, so you cannot make out the A and B on the video, but take it from me that the inv-L is the stronger signal as I switch between the two.</span></div> 1112<div style="text-align: left;"> 1113<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1114<div style="text-align: left;"> 1115<span style="font-family: Arial, Helvetica, sans-serif;">OK, here is one, I'll add the other later.</span></div> 1116<div style="text-align: left;"> 1117<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1118<div class="separator" style="clear: both; text-align: center;"> 1119<iframe allowfullscreen='allowfullscreen' webkitallowfullscreen='webkitallowfullscreen' mozallowfullscreen='mozallowfullscreen' width='320' height='266' src='https://www.blogger.com/video.g?token=AD6v5dz5DyZvYoEMoT9roRNPMildRKr1nCciaABBHVZeAd8Ff0ycqwf1N0ILofjVs3jSssx8QX6-pqZkyO0XWHlGMQ' class='b-hbp-video b-uploaded' frameborder='0'></iframe></div> 1120<div style="text-align: left;"> 1121<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1122<div style="text-align: left;"> 1123<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1124<div style="text-align: left;"> 1125<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1126<div style="text-align: left;"> 1127<span style="font-family: Arial, Helvetica, sans-serif;"><br /></span></div> 1128</content><link rel='replies' type='application/atom+xml' href='https://photohamrad.blogspot.com/feeds/5372957062968788260/comments/default' title='Post Comments'/><link rel='replies' type='text/html' href='https://photohamrad.blogspot.com/2014/05/spring-fun-with-antennas.html#comment-form' title='0 Comments'/><link rel='edit' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5372957062968788260'/><link rel='self' type='application/atom+xml' href='https://www.blogger.com/feeds/7750735187888945261/posts/default/5372957062968788260'/><link rel='alternate' type='text/html' href='https://photohamrad.blogspot.com/2014/05/spring-fun-with-antennas.html' title='Spring fun with antennas'/><author><name>simonhk (G0FCU)</name><uri>http://www.blogger.com/profile/17684655431803427641</uri><email>[email protected]</email><gd:image rel='http://schemas.google.com/g/2005#thumbnail' width='16' height='16' src='https://img1.blogblog.com/img/b16-rounded.gif'/></author>
1128<media:thumbnail xmlns:media="http://search.yahoo.com/mrss/" url="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2UCf6g6GJ8-dxnXKPg2VD3ilzVPoZIIsnrxp1fF65skBZVryrbB-pcQa9oiMXmAdh03lM52PD9YcTVACxjQ0_s4f5K338Ru-b5h-e7tQnJzXQg1M1ragN_KXAdGkvb-fIqiaF5-rVLJs/s72-c/IMG_20140517_143830.jpg" height="72" width="72"/><thr:total>0</thr:total></entry></feed>
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