3 ms·
I know what you mean, you mean the software for SDRs is mostly geared towards tuning to 1090 MHz and decoding ADS-B pulses there. But to be clear: the SDR's tu
by superkuh 7y ago
I know what you mean, you mean the software for SDRs is mostly geared towards tuning to 1090 MHz and decoding ADS-B pulses there.
But to be clear: the SDR's tuners are rarely limited that way. Most can tune to 978 MHz even easier than 1090 MHz. Covering the entire VHF to UHF range is pretty typical.
- crankylinuxuser 7y agoWhen I've set up P25 receivers, it's common to use 2-4 RTL-SDR's to do the bulk of listening. Each rtl-sdr gets set with a different center freq, and the control channel tells when and where to listen. You can build a P25 listener for less than $100.
- someguydave 7y agowhich software do you use to demodulate P25? gnuradio?
- crankylinuxuser 7y agoI use https://github.com/robotastic/trunk-recorder https://github.com/robotastic/trunk-recorder You'll use https://www.radioreference.com 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/ 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 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-to-OpenMHz https://github.com/robotastic/trunk-recorder/wiki/Uploading-... ).
- prashnts 7y agoNot OP, but thank you! I recently got a SDR dongle and was going to set it up. This will help.