trunk-recorder

Hop on to https://gitter.im/trunk-recorder/Lobby if you are having trouble getting the https://github.com/robotastic/trunk-recorder software running. Trunk Recorder puts a wrapper around the OP25 software and lets you capture all of the audio from a radio system using an SDR.

I use https://github.com/robotastic/trunk-recorder You'll use https://www.radioreference.com and get the appropriate control and voice channels for your area. You'll also get the talkgroups and put them in a CSV. From there, you'll use http://garvas.org/trunk-recorder/ to determine how many RTL-SDR dongles (or others) you'll need, along with their respective center frequencies. Note that you'll copy/paste the relevant control/voice line for your p25 from radioreferece.com From there, just define where to store the files on the drive, and off it goes. There's a python webserver ( https://github.com/ScanOC/trunk-player ) you can install for on-prem, and/or you can also upload it to openmhz website ( https://github.com/robotastic/trunk-recorder/wiki/Uploading-... ).

Unfortunately, I wasn't able to find a nice generic way to make it easy to configure the PFBs. There is a good thread on it here, with some sample code: https://github.com/robotastic/trunk-recorder/issues/76 If I can get a block of free time I am going to try and take another tilt at it. I did switch to FFT based filters and that helped a lot. CPU requirements are a lot less. Using RTLs with 2M sample size, instead of SDR more bandwidth also helps. It is a poor mans version of HW-based channelization.

If you are interested in trying to listen your local radio system, try out Trunk Recorder: https://github.com/robotastic/trunk-recorder It works with the cheap $20 RTL-SDR dongles.