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Scanning Central & Northern California Frequencies
Roseville operates a Motorola Type II Trunk Radio System (TRS). There are 5 frequencies the system uses. Then there are talk group IDs (These are what you see under talk groups, for example 1616 - Roseville FD Main). Think of talk groups as the different frequencies for a police department that uses a conventional system. This is how it works, for example every time a firefighter goes to queue a mike on ID 1712 (Fire Tactical 4), the TRS picks a frequency to transmit on. The battalion chief who he is talking to on 1712 queues the mike to respond, however the frequency that the broadcast originated on might not be the same the battalion chief responds on. The radios know when to switch frequencies because they are queued to a data frequency at the same time (one of the 5 frequencies, the data channel frequently rotates). Think about it, dozens departments using 5 frequencies, however in reality they are using 12 of talk groups.
You can hear everything that goes on in Roseville by programming the 5 frequencies into your conventional scanner as conventional frequencies, however you will hear everything (transit, public works and other departments) and with all these agencies operating on 5 channels it is difficult to follow a conversation as it switches frequencies.
Roseville Police Talk Groups
Roseville Fire Talk Groups
Other Roseville Talk Groups