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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
72 lines
6.0 KiB
HTML
72 lines
6.0 KiB
HTML
<!-- APRS MODE -->
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<div id="aprsMode" class="mode-content">
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<div class="section">
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<h3>APRS Tracking</h3>
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<p style="color: var(--text-secondary); font-size: 11px; line-height: 1.5; margin-bottom: 15px;">
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Decode APRS (Automatic Packet Reporting System) amateur radio position reports on VHF.
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</p>
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<div style="background: rgba(255,193,7,0.1); border: 1px solid var(--accent-yellow); border-radius: 4px; padding: 8px; margin-bottom: 10px; font-size: 10px;">
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<strong style="color: var(--accent-yellow);">Amateur Radio</strong><br>
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<span style="color: var(--text-secondary);">APRS operates on 144.390 MHz (N. America) or 144.800 MHz (Europe). Decodes position, weather, and messages from ham radio operators.</span>
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</div>
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<div style="background: rgba(74, 158, 255, 0.1); border: 1px solid rgba(74, 158, 255, 0.3); border-radius: 4px; padding: 8px; font-size: 10px;">
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<span style="color: var(--accent-cyan);">Controls in function bar above map</span>
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</div>
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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 (144–148 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;">Simple Dipole (Easiest)</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> ~51.5 cm each (quarter-wave at 144.39 MHz)</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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<li><strong style="color: var(--text-primary);">Orientation:</strong> Vertical (APRS is FM, vertically polarized)</li>
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<li><strong style="color: var(--text-primary);">Connection:</strong> Center conductor to one element, shield to the other</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; margin-bottom: 10px;">
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<strong style="color: var(--accent-cyan); font-size: 12px;">Commercial Options</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);">Mag-mount 2m whip:</strong> ~$15–25, good mobile/portable option</li>
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<li><strong style="color: var(--text-primary);">2m/70cm dual-band:</strong> ~$20–40, also covers 70cm ham band</li>
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<li><strong style="color: var(--text-primary);">Discone:</strong> ~$30–50, wideband but lower gain on 2m</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);">APRS freq (N. America)</td>
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<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">144.390 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);">APRS freq (Europe)</td>
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<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">144.800 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;">51.5 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 1200 baud</td>
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</tr>
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<tr>
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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;">Vertical</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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