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Each SDR mode now includes frequency-specific antenna guidance: - Pager: VHF/UHF dipole info for 153/929 MHz bands - 433 MHz Sensors: quarter-wave ground plane for ISM band - Utility Meters: 912 MHz stock antenna tips and upgrades - APRS: 2m band dipole and commercial options for 144.39 MHz - SSTV: V-dipole for ISS reception at 145.800 MHz - AIS: marine VHF antenna for 162 MHz vessel tracking - Listening Post: wideband discone recommendation with band table - Meshtastic: LoRa 915/868 MHz antenna upgrades and placement - ADS-B: 1090 MHz collinear, commercial options, LNA/placement Each guide includes antenna type, element lengths, placement tips, and a quick reference table with key specs for the mode. https://claude.ai/code/session_01FjLTkyELaqh27U1wEXngFQ
103 lines
6.3 KiB
HTML
103 lines
6.3 KiB
HTML
<!-- SSTV MODE -->
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<div id="sstvMode" class="mode-content">
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<div class="section">
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<h3>ISS SSTV Decoder</h3>
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<p class="info-text" style="font-size: 11px; color: var(--text-dim); margin-bottom: 12px;">
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Decode Slow-Scan Television images from the International Space Station.
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ISS SSTV transmits on 145.800 MHz FM during special events.
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</p>
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</div>
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<div class="section">
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<h3>Decoder Settings</h3>
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<div class="form-group">
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<label>Frequency (MHz)</label>
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<input type="number" id="sstvFrequency" value="145.800" step="0.001" min="100" max="500">
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</div>
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</div>
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<div class="section">
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<h3>Resources</h3>
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<div style="display: flex; flex-direction: column; gap: 6px;">
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<a href="https://ariss.org/" target="_blank" rel="noopener" class="preset-btn" style="text-decoration: none; text-align: center;">
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ARISS.org (Event Schedule)
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</a>
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<a href="https://www.amsat.org/sstv-from-iss/" target="_blank" rel="noopener" class="preset-btn" style="text-decoration: none; text-align: center;">
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AMSAT SSTV Guide
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</a>
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</div>
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</div>
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<div class="section">
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<h3>About SSTV</h3>
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<p class="info-text" style="font-size: 11px; color: var(--text-dim);">
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SSTV (Slow-Scan Television) is a method for transmitting images via radio.
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The ISS periodically transmits commemorative images during special events
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which can be received with an RTL-SDR and appropriate software.
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</p>
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<p class="info-text" style="font-size: 11px; color: var(--text-dim); margin-top: 8px;">
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Common modes: PD120, PD180, Martin1, Scottie1
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</p>
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</div>
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<!-- Antenna Guide -->
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<div class="section">
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<h3>Antenna Guide</h3>
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<div style="font-size: 11px; color: var(--text-dim); line-height: 1.5;">
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<p style="margin-bottom: 8px; color: var(--accent-cyan); font-weight: 600;">
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2m band (145.800 MHz) — stock SDR antenna will NOT work
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</p>
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<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px; margin-bottom: 10px;">
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<strong style="color: var(--accent-cyan); font-size: 12px;">V-Dipole (Easiest — ~$5)</strong>
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<ul style="margin: 6px 0 0 14px; padding: 0;">
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<li><strong style="color: var(--text-primary);">Element length:</strong> ~51 cm each (quarter-wave at 145.8 MHz)</li>
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<li><strong style="color: var(--text-primary);">Angle:</strong> 120° between elements for partial RHCP</li>
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<li><strong style="color: var(--text-primary);">Orientation:</strong> Lay flat, angled toward the ISS pass direction</li>
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<li><strong style="color: var(--text-primary);">Material:</strong> Wire, coat hanger, or copper rod</li>
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</ul>
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<p style="margin-top: 6px; color: var(--text-dim); font-style: italic;">
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Same antenna as weather satellites (similar frequency). A QFH or turnstile for 137 MHz also works well here.
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</p>
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</div>
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<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px; margin-bottom: 10px;">
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<strong style="color: var(--accent-cyan); font-size: 12px;">Tips for ISS Reception</strong>
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<ul style="margin: 6px 0 0 14px; padding: 0;">
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<li><strong style="color: var(--text-primary);">ISS altitude:</strong> ~420 km, overhead passes last 5–10 minutes</li>
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<li><strong style="color: var(--text-primary);">Best passes:</strong> Elevation > 30° for clear signal</li>
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<li><strong style="color: var(--text-primary);">Outdoors:</strong> Clear sky view is essential. Roof or open field</li>
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<li><strong style="color: var(--text-primary);">LNA:</strong> Optional but helps — 2m filtered LNA at antenna feed</li>
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<li><strong style="color: var(--text-primary);">Doppler:</strong> ISS moves fast — signal shifts ±3.5 kHz during pass</li>
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</ul>
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</div>
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<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px;">
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<strong style="color: var(--accent-cyan); font-size: 12px;">Quick Reference</strong>
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<table style="width: 100%; margin-top: 6px; font-size: 10px; border-collapse: collapse;">
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<tr style="border-bottom: 1px solid var(--border-color);">
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<td style="padding: 3px 4px; color: var(--text-dim);">ISS SSTV frequency</td>
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<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">145.800 MHz</td>
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</tr>
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<tr style="border-bottom: 1px solid var(--border-color);">
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<td style="padding: 3px 4px; color: var(--text-dim);">Quarter-wave length</td>
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<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">51 cm</td>
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</tr>
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<tr style="border-bottom: 1px solid var(--border-color);">
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<td style="padding: 3px 4px; color: var(--text-dim);">Modulation</td>
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<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">FM (25 kHz)</td>
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</tr>
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<tr style="border-bottom: 1px solid var(--border-color);">
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<td style="padding: 3px 4px; color: var(--text-dim);">Polarization</td>
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<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">RHCP (circular)</td>
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</tr>
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<tr>
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<td style="padding: 3px 4px; color: var(--text-dim);">Typical pass duration</td>
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<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">5–10 min</td>
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</tr>
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</table>
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</div>
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</div>
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</div>
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</div>
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