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feat(ook): add cheat sheet with modulation and timing guide

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Covers identifying modulation type (PWM/PPM/Manchester), finding
pulse timing via rtl_433 -A, common ISM frequencies and timings,
and troubleshooting tips for tolerance and bit order.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
thatsatechnique
2026-03-04 12:08:32 -08:00
parent f771100a4c
commit b4757b1589
1 changed files with 15 additions and 0 deletions
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static/js/core/cheat-sheets.js
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@@ -27,6 +27,21 @@ const CheatSheets = (function () {
radiosonde: { title: 'Radiosonde Tracker', icon: '🎈', hardware: 'RTL-SDR dongle', description: 'Tracks weather balloons via radiosonde telemetry using radiosonde_auto_rx.', whatToExpect: 'Position, altitude, temperature, humidity, pressure from active sondes.', tips: ['Sondes transmit on 400–406 MHz', 'Set your region to narrow the scan range', 'Gain 40 dB is a good starting point'] },
morse: { title: 'CW/Morse Decoder', icon: '📡', hardware: 'RTL-SDR + HF antenna (or upconverter)', description: 'Decodes CW Morse code via Goertzel tone detection or OOK envelope detection.', whatToExpect: 'Decoded Morse characters, WPM estimate, signal level.', tips: ['CW Tone mode for HF amateur bands (e.g. 7.030, 14.060 MHz)', 'OOK Envelope mode for ISM/UHF signals', 'Use band presets for quick tuning to CW sub-bands'] },
meteor: { title: 'Meteor Scatter', icon: '☄️', hardware: 'RTL-SDR + VHF antenna (143 MHz)', description: 'Monitors VHF beacon reflections from meteor ionization trails.', whatToExpect: 'Waterfall display with transient ping detections and event logging.', tips: ['GRAVES radar at 143.050 MHz is the primary target', 'Use a Yagi pointed south (from Europe) for best results', 'Peak activity during annual meteor showers (Perseids, Geminids)'] },
ook: {
title: 'OOK Signal Decoder',
icon: '📡',
hardware: 'RTL-SDR dongle',
description: 'Decodes raw On-Off Keying (OOK) signals via rtl_433 flex decoder. Captures frames with configurable pulse timing and displays raw bits, hex, and ASCII — useful for reverse-engineering unknown ISM-band protocols.',
whatToExpect: 'Decoded bit sequences, hex payloads, and ASCII interpretation. Each frame shows bit count, timestamp, and optional RSSI.',
tips: [
'<strong>Identifying modulation</strong> — <em>PWM</em>: pulse widths vary (short=1, long=0), gaps constant — most common for ISM remotes/sensors. <em>PPM</em>: pulses constant, gap widths encode data. <em>Manchester</em>: self-clocking, equal-width pulses, data in transitions.',
'<strong>Finding pulse timing</strong> — Run <code>rtl_433 -f 433.92M -A</code> in a terminal to auto-analyze signals. It prints detected pulse widths (short/long) and gap timings. Use those values in the Short/Long Pulse fields.',
'<strong>Common ISM timings</strong> — 300/600µs (weather stations, door sensors), 400/800µs (car keyfobs), 500/1500µs (garage doors, doorbells), 500µs Manchester (tire pressure monitors).',
'<strong>Frequencies to try</strong> — 315 MHz (North America keyfobs), 433.920 MHz (global ISM), 868 MHz (Europe ISM), 915 MHz (US ISM/meters).',
'<strong>Troubleshooting</strong> — Garbled output? Try halving or doubling pulse timings. No frames? Increase tolerance (±200–300µs). Too many frames? Enable deduplication. Wrong characters? Toggle MSB/LSB bit order.',
'<strong>Tolerance &amp; reset</strong> — Tolerance is how much timing can drift (±150µs default). Reset limit is the silence gap that ends a frame (8000µs). Lower gap limit if frames are merging together.',
]
},
};
function show(mode) {