Note: When I first attempted to install these programs, I ran into a few problems, mostly due to the order that I installed things. To build our SDR-based Trunked Radio scanner, we will need to install UniTrunker, as well as a few other required dependencies. UniTrunker is a Trunk Radio decoder that supports Motorola Type II, EDACS, MPT1327, P25 systems and works well with RTL-based SDRs. UniTrunker: Trunk Radio decoding software My location here in Iowa borders Illinois, so talkgroups for law enforcement, fire, and safety share a common control channel. Even cities, states, and provinces can be linked together. School campuses consisting of multiple buildings in various parts of the city can all be linked. In the ‘trunked’ system, the officers would be assigned to a talkgroup and not a dedicated channel and share a smaller pool of channels. It is common for greater than 350 talkgroups to share as few as 20 channels.Īnother benefit of a trunking system is multiple sites at separate locations can be linked together. An example could be made that a police agency needing a dozen conventional channels, would waste that portion of the spectrum if the channel were idle for any significant amount of time. Prior to its implementation, radio frequencies that were assigned were static. Trunking systems provide very efficient use of the radio spectrum. It becomes apparent that if we were to monitor a single frequency, we would miss most of the radio traffic for a given talkgroup’s system. When the transmission is responded to, this process is repeated and typically a different frequency is assigned for the reply.
The control computer then assigns a frequency, and all radios logged into that talkgroup, switch to that assigned frequency, so they can hear the transmission.
When the user pushes the PTT (push-to-talk) key, a request is sent to the control computer. Virtual channels are created by an admin and assigned talkgroup numbers (listed in the Target column of UniTrunker). All radios in the talkgroup monitor the control channel to know which frequency to listen to.
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