https://warriorlifepodcast.com/demo/demo-decoder.js?v=4cd0079a47c8

1/* Sample messages only. No audio decoder, network, or persistent log. */
2(() => {
3  "use strict";
4  const stations = [
5    ["K1JT", "FN31", 356, -15], ["W3LPL", "FN20", 822, -8],
6    ["VE3EJ", "EN82", 1076, -4], ["G4ABC", "IO91", 1456, -12],
7    ["JA1ABC", "PM95", 1860, -20], ["VK2ABC", "QF56", 2226, -17],
8    ["N6RV", "DM03", 2336, -7], ["PY2AA", "GG66", 2856, -14]
9  ];
10  class DemoDecoder {
11    constructor() { this.history = []; this.roster = new Map(); this.lastSlot = null; this.cycles = 0; this.mode = "FT8"; }
12    advance(seconds, home = {}) {
13      const mode = window.dccDemoStation?.mode || "FT8";
14      const period = window.dccDemoStation?.period || 15;
15      const ready = window.dccDemoStation?.rxReady || 13.2;
16      if (this.mode !== mode) { this.mode = mode; this.history = []; this.roster.clear(); this.lastSlot = null; this.cycles = 0; }
17      const slot = Math.floor((seconds - ready) / period);
18      if (slot === this.lastSlot) return null;
19      this.lastSlot = slot;
20      this.cycles++;
21      const utc = new Date(slot * period * 1000).toISOString().slice(11, 19).replaceAll(":", "");
22      const latest = stations.flatMap(([call, grid, audio_hz, base], index) => {
23        if (home.receiving === false) return [];
24        if ((slot % 2 + 2) % 2 !== index % 2) return [];
25        const phase = ((Math.floor(slot / 2) + index) % 4 + 4) % 4;
26        const db = base + ((slot + index) % 5 + 5) % 5 - 2;
27        const messages = mode === "WSPR" ? Array(4).fill(`${call} ${grid} ${index % 2 ? 30 : 37}`) : ["JS8", "PSK31", "RTTY"].includes(mode)
28          ? [`CQ CQ DE ${call} ${call} ${grid} K`, `${call}: HELLO FROM ${grid}`, `${call}: RST 599 THANKS FOR THE CALL`, `${call}: GOOD DX 73`]
29          : [`CQ ${call} ${grid}`, `W1ABC ${call} -08`, `W1ABC ${call} R-10`, `W1ABC ${call} RR73`];
30        const row = {call, grid, audio_hz: mode === "WSPR" ? 1410 + index*8 : audio_hz, db, dt: (index % 3 - 1) / 10,
31          utc, message: messages[phase], is_cq: mode !== "WSPR" && phase === 0, status: mode === "WSPR" ? "Beacon" : phase === 0 ? "CQ" : "QSO",
32          mode, period_seconds: period, period_index: slot, worked: false, received_at: slot * period + ready};
33        this.roster.set(call, row);
34        return [row];
35      });
36      this.history = [...latest, ...this.history].slice(0, 80);
37      return {decodes: this.history, latest_cycle: latest,
38        roster: [...this.roster.values()].map(row => ({...row,
39          seen_seconds: Math.max(0, seconds - row.received_at),
40          seen: seconds - row.received_at < period ? "Now" : `${period} sec`})),
41        status: {demo: true, mode, period_seconds: period, enabled: true, cycles_completed: this.cycles,
42          last_message_count: latest.length, station_call: home.call || "N0CALL", station_grid: home.grid || "FN31"}};
43    }
44  }
45  window.DccDemoDecoder = DemoDecoder;
46})();