sdrx is a software defined narrow band multi channel AM airband receiver that
uses R820T(2)/R860 based RTL-SDR or a Airspy Mini/R2 dongles as it's hardware
part. It's also a program for experimenting with different SDR implementation
aspects such as translation, downsampling, filtering, channelization,
demodulation, interaction between clock domains, threading and audio processing.
sdrx is written in C++17 and is tested on a x86_64 machine running Fedora 35,
on a Raspberry Pi 4 Model B 4GiB and on a Raspberry Pi Zero 2 W running Raspberry
Pi OS. Audio is played using ALSA.
The dongles used during development are; RTL-SDR Blog V3, Nooelec NESDR SMArt v4, Airspy Mini and Airspy R2. The program only support R820T(2)/R860 based devices and may be incompatible with other RTL dongles and less powerfull Raspberry Pi models. YMMV.
sdrx is a text console program intended to be run from a terminal. Basic Linux
understanding is expecetd from the user, especially with respect to how to
run programs from the command line.
The channelization is currently done with a translate, filter and downsampling approach in one single thread. This is simple, but not the most effective way when listening to many simultaneous channels. Other, more effective methods are being considered in the future.
sdrx is only available in source code form. It is easy to build using the
instructions on the build page.
Instruction for how to run and use sdrx can be found on the usage
page.