Program as MotoTrbo system and put all frequencies into one site and run the LCN Finder from the scanners menu and select that system. All frequencies that have conversations will be logged with a LCN to them. Make a note of the LCNs as they are erased when you start a new Finder session. Eventually after some time you will have catched all LCNs and can start to scan the system.
The problem starts if they use several sites. Then you have to carefully look at each frequencies signal strength as it will be pretty much the same if frequencies belong to the same site. You might have to search the frequency range in analog mode to catch all frequencies in use, if you do not have the correct information from FCC what frequencies that have been assigned to this system. One site will use the same color code and will usually be a different one at another site.
/Ubbe
