# RTLSDR-Airband — istrain: an example voice-channel cluster (replace with YOUR subdivision — see APOCALYPSE-EDITION.md §3)
#
# Run in the foreground with live per-channel waterfalls:
#   rtl_airband -f -e -c config/istrain.conf
#   (-f = foreground + textual waterfalls · -e = errors to stderr · Ctrl-C to stop)
#
# One dongle (1002, Blog V4, TCXO). Five rail-voice channels demodulated SIMULTANEOUSLY (no
# scanning/camping — unlike the rtl_fm scan). The span 160.86–161.19 = 330 kHz fits inside a
# 1.024 MS/s window, which stays UNDER the USB sample-loss ceiling that bit the full 2 MS/s scan.
# Each channel records to its own file in /tmp/airband, and ONLY when squelch opens (continuous=false)
# — so the files stay small and hold real audio, not hiss.
#
# Primary (example) = 160.980 (AAR ch58), the road channel + the CJ 144.7 / 157.8 detectors. See CHANNELS.md.
# Tune squelch_snr_threshold up if it records noise, down if it misses weak transmissions.

fft_size = 1024;
localtime = true;

devices:
({
  type = "rtlsdr";
  serial = "1002";
  gain = 40;
  centerfreq = 161.025;
  sample_rate = 1.024;
  correction = 0;
  channels:
  (
    {
      freq = 160.980;
      label = "NS Dayton Rd 160.980 ch58 *MISSION*";
      modulation = "nfm";
      bandwidth = 12500;
      squelch_snr_threshold = 4.0;
      outputs: ( { type = "file"; directory = "/tmp/airband"; filename_template = "ns_dayton_road_160980"; continuous = false; split_on_transmission = true; } );
    },
    {
      freq = 160.920;
      label = "NS Buckeye Yard 160.920 ch54";
      modulation = "nfm";
      bandwidth = 12500;
      squelch_snr_threshold = 4.0;
      outputs: ( { type = "file"; directory = "/tmp/airband"; filename_template = "ns_buckeye_yard_160920"; continuous = false; split_on_transmission = true; } );
    },
    {
      freq = 161.190;
      label = "NS Col+Sandusky 161.190 ch72";
      modulation = "nfm";
      bandwidth = 12500;
      squelch_snr_threshold = 4.0;
      outputs: ( { type = "file"; directory = "/tmp/airband"; filename_template = "ns_col_sandusky_161190"; continuous = false; split_on_transmission = true; } );
    },
    {
      freq = 160.860;
      label = "CSX Scottslawn 160.860 ch50";
      modulation = "nfm";
      bandwidth = 12500;
      squelch_snr_threshold = 4.0;
      outputs: ( { type = "file"; directory = "/tmp/airband"; filename_template = "csx_scottslawn_160860"; continuous = false; split_on_transmission = true; } );
    },
    {
      freq = 161.085;
      label = "NS Col area 161.085 ch65";
      modulation = "nfm";
      bandwidth = 12500;
      squelch_snr_threshold = 4.0;
      outputs: ( { type = "file"; directory = "/tmp/airband"; filename_template = "ns_col_area_161085"; continuous = false; split_on_transmission = true; } );
    }
  );
});