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Add multi-arch build support and detailed antenna guide

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Multi-arch Docker builds:
- build-multiarch.sh: Cross-compile amd64+arm64 on x64 and push to
  registry, so RPi5 can docker pull instead of building natively
- docker-compose.yml: Add INTERCEPT_IMAGE env var to support pulling
  pre-built images from a registry instead of local build
- README.md: Docker build section rewritten with multi-arch workflow,
  registry pull instructions, and build script options

Weather satellite antenna guide (sidebar panel):
- V-Dipole: ASCII diagram, 53.4cm element length, 120 degree angle,
  materials, orientation, connection instructions
- Turnstile/Crossed Dipole: phasing coax length (37cm RG-58),
  reflector distance (52cm below), RHCP explanation
- QFH Quadrifilar Helix: design overview, materials, height (46cm),
  hemispherical gain pattern
- Placement & LNA: outdoor requirements, coax loss figures,
  LNA mounting position, Nooelec SAWbird+ recommendation, Bias-T
- Quick reference table: wavelength, quarter-wave, elevation,
  duration, polarization, APT/LRPT bandwidth

Also added Weather Satellites and ISS SSTV to README features list,
SatDump to acknowledgments.

https://claude.ai/code/session_01FjLTkyELaqh27U1wEXngFQ
This commit is contained in:
Claude
2026-02-05 21:59:55 +00:00
parent 5e4be0c279
commit 500ddf59fe
4 changed files with 377 additions and 85 deletions
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162
templates/partials/modes/weather-satellite.html
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@@ -31,39 +31,145 @@
</div>
</div>
<!-- Antenna Guide - detailed -->
<div class="section">
<h3>Antenna Guide (137 MHz)</h3>
<div style="font-size: 11px; color: var(--text-dim);">
<p style="margin-bottom: 8px; color: var(--accent-cyan);">Weather satellites transmit at ~137 MHz. Your stock SDR antenna likely won't work well at this frequency.</p>
<h3>Antenna Guide</h3>
<div style="font-size: 11px; color: var(--text-dim); line-height: 1.5;">
<div style="margin-bottom: 8px;">
<strong style="color: var(--text-primary);">V-Dipole (Easiest Build)</strong>
<ul style="margin: 4px 0 0 16px; padding: 0;">
<li>Two elements, ~53.4 cm each (quarter wavelength)</li>
<li>Spread at 120 angle, laid flat or tilted</li>
<li>Connect to SDR via coax with a BNC/SMA adapter</li>
<li>Cost: ~$5 in wire</li>
<p style="margin-bottom: 10px; color: var(--accent-cyan); font-weight: 600;">
137 MHz band &mdash; your stock SDR antenna will NOT work.
</p>
<p style="margin-bottom: 10px;">
Weather satellites transmit at 137.1&ndash;137.9 MHz. The quarter-wave
at this frequency is <strong style="color: var(--text-primary);">~53 cm</strong>,
far longer than the small telescopic antenna shipped with most SDRs
(tuned for ~1 GHz). You need a purpose-built antenna.
</p>
<!-- V-Dipole -->
<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px; margin-bottom: 10px;">
<strong style="color: var(--accent-cyan); font-size: 12px;">V-Dipole (Easiest &mdash; ~$5)</strong>
<div style="margin: 8px 0; padding: 8px; background: var(--bg-tertiary); border-radius: 3px; font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-secondary); white-space: pre; line-height: 1.3; text-align: center;"> coax to SDR
|
===+=== feed point
/ \
/ 120 \
/ \
/ deg \
53.4cm 53.4cm</div>
<ul style="margin: 6px 0 0 14px; padding: 0;">
<li><strong style="color: var(--text-primary);">Element length:</strong> 53.4 cm each (quarter wavelength at 137 MHz)</li>
<li><strong style="color: var(--text-primary);">Angle:</strong> 120&deg; between elements (not 180&deg;)</li>
<li><strong style="color: var(--text-primary);">Material:</strong> Any stiff wire, coat hanger, or copper rod</li>
<li><strong style="color: var(--text-primary);">Orientation:</strong> Lay flat or tilt 30&deg; toward expected pass direction</li>
<li><strong style="color: var(--text-primary);">Polarization:</strong> The 120&deg; angle gives partial RHCP match to satellite signal</li>
<li><strong style="color: var(--text-primary);">Connection:</strong> Solder elements to coax center + shield, connect to SDR via SMA</li>
</ul>
<p style="margin-top: 6px; color: var(--text-dim); font-style: italic;">
Best starter antenna. Good enough for clear NOAA images with a direct overhead pass.
</p>
</div>
<!-- Turnstile -->
<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px; margin-bottom: 10px;">
<strong style="color: var(--accent-cyan); font-size: 12px;">Turnstile / Crossed Dipole (~$10-15)</strong>
<div style="margin: 8px 0; padding: 8px; background: var(--bg-tertiary); border-radius: 3px; font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-secondary); white-space: pre; line-height: 1.3; text-align: center;"> 53.4cm
&lt;---------&gt;
====+==== dipole 1
|
====+==== dipole 2
&lt;---------&gt;
90 deg rotated
+ reflector below</div>
<ul style="margin: 6px 0 0 14px; padding: 0;">
<li><strong style="color: var(--text-primary);">Elements:</strong> Two crossed dipoles, each 53.4 cm per side (4 elements total)</li>
<li><strong style="color: var(--text-primary);">Angle:</strong> 90&deg; between the two dipole pairs</li>
<li><strong style="color: var(--text-primary);">Phasing:</strong> Feed dipole 2 with a 90&deg; delay (quarter-wave coax section ~37 cm of RG-58)</li>
<li><strong style="color: var(--text-primary);">Reflector:</strong> Place ~52 cm below elements (ground plane or wire grid)</li>
<li><strong style="color: var(--text-primary);">Polarization:</strong> Circular (RHCP) &mdash; matches satellite transmission</li>
</ul>
<p style="margin-top: 6px; color: var(--text-dim); font-style: italic;">
Better than V-dipole. The reflector rejects ground noise and the RHCP phasing matches the satellite signal.
</p>
</div>
<!-- QFH -->
<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px; margin-bottom: 10px;">
<strong style="color: #00ff88; font-size: 12px;">QFH &mdash; Quadrifilar Helix (Best &mdash; ~$20-30)</strong>
<div style="margin: 8px 0; padding: 8px; background: var(--bg-tertiary); border-radius: 3px; font-family: 'JetBrains Mono', monospace; font-size: 10px; color: var(--text-secondary); white-space: pre; line-height: 1.3; text-align: center;"> ___
/ \ two helix loops
| | | twisted 90 deg
| | | around a mast
\___/
|
coax</div>
<ul style="margin: 6px 0 0 14px; padding: 0;">
<li><strong style="color: var(--text-primary);">Design:</strong> Two bifilar helical loops, offset 90&deg;</li>
<li><strong style="color: var(--text-primary);">Material:</strong> Copper pipe (10mm), copper wire, or coax outer shield</li>
<li><strong style="color: var(--text-primary);">Total height:</strong> ~46 cm (for 137 MHz)</li>
<li><strong style="color: var(--text-primary);">Loop dimensions:</strong> Use a QFH calculator for exact bending measurements</li>
<li><strong style="color: var(--text-primary);">Polarization:</strong> True RHCP omnidirectional &mdash; ideal for overhead satellite passes</li>
<li><strong style="color: var(--text-primary);">Gain pattern:</strong> Hemispherical upward coverage, rejects ground interference</li>
</ul>
<p style="margin-top: 6px; color: var(--text-dim); font-style: italic;">
Gold standard for weather satellite reception. No tracking needed &mdash; covers the whole sky.
</p>
</div>
<!-- Placement & LNA -->
<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px; margin-bottom: 10px;">
<strong style="color: var(--accent-cyan); font-size: 12px;">Placement & LNA</strong>
<ul style="margin: 6px 0 0 14px; padding: 0;">
<li><strong style="color: var(--text-primary);">Location:</strong> OUTDOORS with clear sky view is critical. Roof/balcony/open field.</li>
<li><strong style="color: var(--text-primary);">Height:</strong> Higher is better but not critical &mdash; clear horizon line matters more</li>
<li><strong style="color: var(--text-primary);">Antenna up:</strong> Point the antenna straight UP (zenith) for best overhead coverage</li>
<li><strong style="color: var(--text-primary);">Avoid:</strong> Metal roofs, power lines, buildings blocking the sky</li>
<li><strong style="color: var(--text-primary);">Coax length:</strong> Keep short (&lt;10m). Signal loss at 137 MHz is ~3 dB per 10m of RG-58</li>
<li><strong style="color: var(--text-primary);">LNA:</strong> Mount at the antenna feed point, NOT at the SDR end.
Recommended: Nooelec SAWbird+ NOAA (137 MHz filtered LNA, ~$30)</li>
<li><strong style="color: var(--text-primary);">Bias-T:</strong> Enable the Bias-T checkbox above if your LNA is powered via the coax from the SDR</li>
</ul>
</div>
<div style="margin-bottom: 8px;">
<strong style="color: var(--text-primary);">QFH Antenna (Best)</strong>
<ul style="margin: 4px 0 0 16px; padding: 0;">
<li>Quadrifilar helix - omnidirectional RHCP</li>
<li>Best for overhead passes, rejects ground noise</li>
<li>Build from copper pipe or coax</li>
<li>Cost: ~$20-30 in materials</li>
</ul>
</div>
<div style="margin-bottom: 8px;">
<strong style="color: var(--text-primary);">Tips</strong>
<ul style="margin: 4px 0 0 16px; padding: 0;">
<li>Outdoors with clear sky view is critical</li>
<li>LNA (e.g. Nooelec SAWbird) helps a lot</li>
<li>Enable Bias-T if using a powered LNA</li>
<li>Passes >30 elevation give best images</li>
</ul>
<!-- Quick reference -->
<div style="background: var(--bg-primary); border: 1px solid var(--border-color); border-radius: 4px; padding: 10px;">
<strong style="color: var(--accent-cyan); font-size: 12px;">Quick Reference</strong>
<table style="width: 100%; margin-top: 6px; font-size: 10px; border-collapse: collapse;">
<tr style="border-bottom: 1px solid var(--border-color);">
<td style="padding: 3px 4px; color: var(--text-dim);">Wavelength (137 MHz)</td>
<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">218.8 cm</td>
</tr>
<tr style="border-bottom: 1px solid var(--border-color);">
<td style="padding: 3px 4px; color: var(--text-dim);">Quarter wave (element length)</td>
<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">53.4 cm</td>
</tr>
<tr style="border-bottom: 1px solid var(--border-color);">
<td style="padding: 3px 4px; color: var(--text-dim);">Best pass elevation</td>
<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">&gt; 30&deg;</td>
</tr>
<tr style="border-bottom: 1px solid var(--border-color);">
<td style="padding: 3px 4px; color: var(--text-dim);">Typical pass duration</td>
<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">10-15 min</td>
</tr>
<tr style="border-bottom: 1px solid var(--border-color);">
<td style="padding: 3px 4px; color: var(--text-dim);">Polarization</td>
<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">RHCP</td>
</tr>
<tr style="border-bottom: 1px solid var(--border-color);">
<td style="padding: 3px 4px; color: var(--text-dim);">NOAA (APT) bandwidth</td>
<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">~40 kHz</td>
</tr>
<tr>
<td style="padding: 3px 4px; color: var(--text-dim);">Meteor (LRPT) bandwidth</td>
<td style="padding: 3px 4px; color: var(--text-primary); text-align: right;">~140 kHz</td>
</tr>
</table>
</div>
</div>
</div>