sdr_pmr446

Simple PMR446 scanner. Doesn't jump between channels - PMR is narrow enough (200kHz) to fit most SDRs bandwidths, so only resampling is needed and then polyphase filterbank channelizer follows. Each channel is NBFM demodulated, the audio filtered to remove CTCSS and de-emphasized (+ optionally lowpass filtered). This app can also display ASCII-rendered waterfall in terminal (-w argument).

Building and testing is done for RTL-SDR, but SoapySDR is used to interface to SDR hardware, so it all should work with other, supported by SoapySDR, receivers.

Building

Look at build.yml for details.

Other applications

• dsd_in - simple DSD input signal processor

  Replaces the normal combination of rtl_fm and sox used to feed the signal into DSD while having better processing characteristics.

  To debug/listen to the demodulated output:

  ./dsd_in -f 160.0e6 -g 35 | play -r48k -traw -es -b16 -c1 -V1 -