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fix(weather-sat): lower default gain to 30 dB to prevent ADC saturation

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Strong passes at 40 dB (the previous default) cause RTL-SDR ADC clipping,
producing a distorted IQ stream that SatDump cannot lock onto. 30 dB is
a safer starting point that still captures weak passes cleanly.

Also adds a UI hint below the gain control explaining the saturation issue.

Closes #185
This commit is contained in:
James Smith
2026-04-05 14:20:06 +01:00
parent 6572119360
commit 6ea34a4c60
3 changed files with 215 additions and 214 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
config.py
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@@ -459,7 +459,7 @@ SATELLITE_TRAJECTORY_POINTS = _get_env_int('SATELLITE_TRAJECTORY_POINTS', 30)
SATELLITE_ORBIT_MINUTES = _get_env_int('SATELLITE_ORBIT_MINUTES', 45) SATELLITE_ORBIT_MINUTES = _get_env_int('SATELLITE_ORBIT_MINUTES', 45)
# Weather satellite settings # Weather satellite settings
WEATHER_SAT_DEFAULT_GAIN = _get_env_float('WEATHER_SAT_GAIN', 40.0) WEATHER_SAT_DEFAULT_GAIN = _get_env_float('WEATHER_SAT_GAIN', 30.0)
WEATHER_SAT_SAMPLE_RATE = _get_env_int('WEATHER_SAT_SAMPLE_RATE', 2400000) WEATHER_SAT_SAMPLE_RATE = _get_env_int('WEATHER_SAT_SAMPLE_RATE', 2400000)
WEATHER_SAT_MIN_ELEVATION = _get_env_float('WEATHER_SAT_MIN_ELEVATION', 15.0) WEATHER_SAT_MIN_ELEVATION = _get_env_float('WEATHER_SAT_MIN_ELEVATION', 15.0)
WEATHER_SAT_PREDICTION_HOURS = _get_env_int('WEATHER_SAT_PREDICTION_HOURS', 24) WEATHER_SAT_PREDICTION_HOURS = _get_env_int('WEATHER_SAT_PREDICTION_HOURS', 24)

6
routes/weather_sat.py
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@@ -134,7 +134,7 @@ def start_capture():
{ {
"satellite": "METEOR-M2-3", // Required: satellite key "satellite": "METEOR-M2-3", // Required: satellite key
"device": 0, // RTL-SDR device index (default: 0) "device": 0, // RTL-SDR device index (default: 0)
"gain": 40.0, // SDR gain in dB (default: 40) "gain": 30.0, // SDR gain in dB (default: 30)
"bias_t": false // Enable bias-T for LNA (default: false) "bias_t": false // Enable bias-T for LNA (default: false)
} }
@@ -176,7 +176,7 @@ def start_capture():
# Validate device index and gain # Validate device index and gain
try: try:
device_index = validate_device_index(data.get('device', 0)) device_index = validate_device_index(data.get('device', 0))
gain = validate_gain(data.get('gain', 40.0)) gain = validate_gain(data.get('gain', 30.0))
except ValueError as e: except ValueError as e:
logger.warning('Invalid parameter in start_capture: %s', e) logger.warning('Invalid parameter in start_capture: %s', e)
return jsonify({ return jsonify({
@@ -689,7 +689,7 @@ def enable_schedule():
"longitude": -0.1, // Required "longitude": -0.1, // Required
"min_elevation": 15, // Minimum pass elevation (default: 15) "min_elevation": 15, // Minimum pass elevation (default: 15)
"device": 0, // RTL-SDR device index (default: 0) "device": 0, // RTL-SDR device index (default: 0)
"gain": 40.0, // SDR gain (default: 40) "gain": 30.0, // SDR gain (default: 30)
"bias_t": false // Enable bias-T (default: false) "bias_t": false // Enable bias-T (default: false)
} }

3
templates/partials/modes/weather-satellite.html
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@@ -22,7 +22,8 @@
</div> </div>
<div class="form-group"> <div class="form-group">
<label>Gain (dB)</label> <label>Gain (dB)</label>
<input type="number" id="weatherSatGain" value="40" step="0.1" min="0" max="50"> <input type="number" id="weatherSatGain" value="30" step="0.1" min="0" max="50">
<p class="info-text" style="font-size: 10px; color: var(--text-dim); margin-top: 3px;">Reduce if decoding fails on strong passes (ADC saturation).</p>
</div> </div>
<div class="form-group"> <div class="form-group">
<label style="display: flex; align-items: center; gap: 6px;"> <label style="display: flex; align-items: center; gap: 6px;">