Fix weather sat 0dB SNR: increase sample rate to 2.4 MHz for Meteor LRPT

The default 1 MHz sample rate was too low for SatDump's meteor_m2-x_lrpt
pipeline, causing NOSYNC and 0.000dB SNR. Bumped to 2.4 MHz (SatDump
recommendation) and wired up the WEATHER_SAT_SAMPLE_RATE config value
so it actually gets passed to decoder.start() from both the auto-scheduler
and manual start route.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config.py

@@ -331,7 +331,7 @@ SATELLITE_ORBIT_MINUTES = _get_env_int('SATELLITE_ORBIT_MINUTES', 45)
 
 # Weather satellite settings
 WEATHER_SAT_DEFAULT_GAIN = _get_env_float('WEATHER_SAT_GAIN', 40.0)
-WEATHER_SAT_SAMPLE_RATE = _get_env_int('WEATHER_SAT_SAMPLE_RATE', 1000000)
+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_PREDICTION_HOURS = _get_env_int('WEATHER_SAT_PREDICTION_HOURS', 24)
 WEATHER_SAT_SCHEDULE_REFRESH_MINUTES = _get_env_int('WEATHER_SAT_SCHEDULE_REFRESH_MINUTES', 30)

routes/weather_sat.py

@@ -18,6 +18,7 @@ from utils.weather_sat import (
     is_weather_sat_available,
     CaptureProgress,
     WEATHER_SATELLITES,
+    DEFAULT_SAMPLE_RATE,
 )
 
 logger = get_logger('intercept.weather_sat')
@@ -164,6 +165,7 @@ def start_capture():
         satellite=satellite,
         device_index=device_index,
         gain=gain,
+        sample_rate=DEFAULT_SAMPLE_RATE,
         bias_t=bias_t,
     )
 

utils/weather_sat.py

@@ -85,7 +85,11 @@ WEATHER_SATELLITES = {
 }
 
 # Default sample rate for weather satellite reception
-DEFAULT_SAMPLE_RATE = 1000000  # 1 MHz
+try:
+    from config import WEATHER_SAT_SAMPLE_RATE as _configured_rate
+    DEFAULT_SAMPLE_RATE = _configured_rate
+except ImportError:
+    DEFAULT_SAMPLE_RATE = 2400000  # 2.4 MHz — minimum for Meteor LRPT
 
 
 @dataclass

utils/weather_sat_scheduler.py

@@ -21,10 +21,12 @@ try:
     from config import (
         WEATHER_SAT_SCHEDULE_REFRESH_MINUTES,
         WEATHER_SAT_CAPTURE_BUFFER_SECONDS,
+        WEATHER_SAT_SAMPLE_RATE,
     )
 except ImportError:
     WEATHER_SAT_SCHEDULE_REFRESH_MINUTES = 30
     WEATHER_SAT_CAPTURE_BUFFER_SECONDS = 30
+    WEATHER_SAT_SAMPLE_RATE = 2400000
 
 
 class ScheduledPass:
@@ -330,6 +332,7 @@ class WeatherSatScheduler:
             satellite=sp.satellite,
             device_index=self._device,
             gain=self._gain,
+            sample_rate=WEATHER_SAT_SAMPLE_RATE,
             bias_t=self._bias_t,
         )