sdr-recorder/openspec/changes/archive/2026-03-19-improved-false-positive-detection/tasks.md at 5f3c41ca3dec8108ffba44d282ebf5980669f1c8 - sdr-recorder - Gitea: Git with a cup of tea

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Michael Smith 733fe76ed5 Tune FFT size and squelch to reduce false-positive recordings

Increase fft_size from 512 (default) to 2048 for better NFM channel
isolation, and add squelch_snr_threshold = 15.0 dB per channel to
reject noise-triggered recordings.

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

2026-03-19 13:25:37 +00:00

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1. Configuration Changes

1.1 Set fft_size = 2048 in rtl_airband.conf (uncomment and update from 1024)
1.2 Add squelch_snr_threshold = 15.0 to each of the 3 channel blocks

2. Deploy and Verify

2.1 Copy updated config to Pi and restart the sdr-recorder container
2.2 Clear existing false-positive recordings so results are easy to evaluate
2.3 Observe recording behavior — confirm fewer/no short noise-triggered files appearing