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Tune FFT size and squelch to reduce false-positive recordings

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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>
This commit is contained in:
Michael Smith
2026-03-19 13:25:37 +00:00
parent 9ff0506cae
commit 733fe76ed5
7 changed files with 122 additions and 1 deletions
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5
rtl_airband.conf
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@@ -2,7 +2,7 @@
# Channels: 3 (26.985 MHz), 7 (27.035 MHz), 10 (27.075 MHz)
localtime = false;
fft_size = 1024;
fft_size = 2048;
devices:
({
@@ -20,6 +20,7 @@ devices:
freq = 26.985;
bandwidth = 8000;
modulation = "nfm";
squelch_snr_threshold = 15.0;
label = "CB-CH03";
outputs: (
{
@@ -35,6 +36,7 @@ devices:
freq = 27.035;
bandwidth = 8000;
modulation = "nfm";
squelch_snr_threshold = 15.0;
label = "CB-CH07";
outputs: (
{
@@ -50,6 +52,7 @@ devices:
freq = 27.075;
bandwidth = 8000;
modulation = "nfm";
squelch_snr_threshold = 15.0;
label = "CB-CH10";
outputs: (
{