RTLSDR P25 decoder built with liquid-dsp

See Dockerfile if you want to install within your OS / not inside container

docker build -t rtl_p25 . 

The helper script rtl_devices.sh adds args needed to map USB to the container

docker run $(./rtl_devices.sh) --rm -i rtl_p25 -x 2 -d 0 -s 1200000 -g 62 -p 0 

This program has been designed to be run by other programs following mkfifo patterns described in better sdr drivers. Run rtl_p25 as a child process in your language of choice then hold onto stdin, stdout, and stderr. All arguments follow RTLSDR conventions except -x added for mux aka number of channels.

mkfifo /tmp/mux0 && mkfifo /tmp/mux1 rtl_p25 -x 2 -d 0 -s 1200000 -g 62 -p 0 stdin> tune,851137500,111 stderr> ok,851137500,111 stdin> demod,0,12500,/tmp/mux0,222 stderr> ok,222 stdin> demod,1,-25000,/tmp/mux1,333 stderr> ok,333 

• tune - center freq, nonce
• demod - channel, offset freq, fifo, nonce
• nonce - int for acks on stderr

Programs reading from /tmp/mux0 and /tmp/mux1 will find a P25 di-bit byte stream which may be read into P25 spec frames following these examples.

Copyright 2025 - mike@rhodey.org

MIT