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If you are unsure which dongle is which then you may like to try labeling the dongles with rtl_eeprom first. Note: Make sure that you are entering the correct value for the correct dongle. ![]() Enter that units PPM correction value under “Correction”.In the new window that pops up choose your first RTL-SDR under “RTL Device”.Press the 'Add new receiver' button, and then on the bar that pops up click on the RTL2832 button.Plug in both dongles and then open Unitrunker.The are commonly found in the 400 and 800 MHz bands. Here are some examples of some common trunking modes. They will be signals that are continuously transmitting with no breaks. You can use SDR# or a similar program to search for these first. First determine a trunking control channel that you are interested in monitoring.Setting up the Signal (Control Channel) Receiver Now follow these steps to set up Unitrunker with the RTL2832U. One antenna that splits into two connections for the two dongles, or two antennas that can receive the trunking frequencies you are interested in. ![]() #HOW TO MAKE VB VIRTUAL AUDIO CABLE LISTEN TO CHROME SOFTWARE#The Unitrunker software (Choose the latest version from ).You can also use other supported and more advanced SDR's such as the Airspy. Only the R820T appears to be supported at the moment. You will need one dongle to receive the control channel and one dongle to receive the voice channel. See the Buy RTL-SDR dongles page if you don't already have two. To set up a trunking station we will assume that you have been through the Quickstart guide and thus have a working RTL-SDR setup. Unitrunker Voice Trunking Following Tutorial #HOW TO MAKE VB VIRTUAL AUDIO CABLE LISTEN TO CHROME HOW TO#What follows below is a tutorial on how to set this up. Unitrunker can be used to decode the control channel and follow a voice conversation as it hops across various frequencies. With two RTL-SDR dongles you can set up a trunking receiver station with just Unitrunker. This helps to make radio frequency allocations more efficient.īecause a talkgroup might switch between various frequencies often, it can make listening to a conversation difficult for radio scanners. The control channel determines a vacant frequency that a particular talkgroup should use. In a trunked radio system, a small set number of frequencies are shared between a large number of talkgroups. Each radio receives a special computer controlled control channel. However, this is very inefficient as the frequency may not be in use for the majority of the time. In a normal radio system, one company (or talkgroup) might use a single frequency for radio communications. You can download the latest version of Unitrunker here. ![]() This means that extra SDR receiver software like SDR# is no longer required to use Unitrunker. The popular trunking decoding software Unitrunker now supports the RTL2832U R820T RTL-SDR directly in its new version. MaRTL-SDR Tutorial: Following Trunked Radio with Unitrunker
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