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.
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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.
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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.