I ALSO FOUND I CAN DO THIS WITH AN ADALM-PLUTOSDR BY CHANGING THE –ARGS TO ‘plutosdr’. Now try this command IF YOU ARE SETTING UP A DIFFERENT FREQUENCY FOR YOUR TOWN MAKE SURE TO ADJUST THE FREQUENCY IN THE COMMAND. Check your path for accuracy.Ĭd /home/john/op25/op25/gr-op25_repeater/apps Now go back to your system and get in the correct directory. As you can see I found my Control Channel at 857.2625 as stated above. To find the control channel if you don’t know which one it is just open a program like GQRX and look and listen for the control channel. The actual control channel at the moment (they change it sometimes) is 857.2625. I’m going to demonstrate using my home town of New Bern NC. So plug in your RTL-SDR device and let’s get ready to do this thing. But you only need one of these to track a trunked radio system. Now my assumption here is that you are using a generic RTL-SDR device. How to launch the program with what command to use.Now it is installed but there are three obstacles to overcome. GNUPlot is built in too now it looks like.” There are instructions in the comments below by Scott B that detail the procedure to overcome the compilation error.” Thanks Scott! “NOTE 2: I just installed a fresh version of OP25 on a Raspberry Pi 4 (April 14th,2020) and there was no cmake error.
I’m doing this on Ubuntu 18.04 “NOTE: I’m told that on newer installations that it may be required to install an older version of cmake if compilation errors occur. Download from the repository using this command. Yeah that’s a weird way of doing it but it’ll work and probably the easiest thing to do for a newbie. Follow the directions here if you need to. In a pinch I guess the first thing you could do is to install gqrx which would pull in all the necessary RTL stuff you need. I’m kind of working on the assumption that you have Linux installed and have your SDR device working. There are tutorials out there, some good but everybody leaves out the good stuff or the stuff they took for granted. Now that I have it working I find that it is REMARKABLY easy and I’m mad at all the geeks out there who never made a simple tutorial.
I’m a geek and I messed with it on and off for a year or more and it whipped me more than once. Bear in mind Phase 2 could be encrypted and nothing you can do will decode it. The only things that do Phase 2 are hardware scanners and hardware radios and OP25 for software radios. Some municipal areas are upgrading to P25 Phase 2 so almost gone are the days that you can track them with a police scanner since P25 is a Trunked Radio system and not just a lone frequency to monitor. OP25 is a program that decodes P25 Phase 1 and Phase 2 digital radio.
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