Once you know the frequency of the repeater, there are 2 Time Slots and 16 color codes to determine. Assuming the system uses the ALL CALL talk group (default), then you only have 32 modes or channels to scan. That will require 2 zones only to scan. Program your radio for the 16 color codes on time slot 1 in one zone and TS2 in the next zone, then scan (be sure to create two scan lists, 3 most likely as scan lists hold only 15 talk groups as I recall).
I'd put an analog receiver on the frequency as your alert to repeater activity and then simply switch between the zones as your TRBO radio scans. You will not see any RSSI signal in the TRBO radio until you land on an active talk group. If the system is using custom talk groups, then you have millions of possibilities. Most small or simple systems tend to use ALL CALL so you might get lucky.
Originally Posted by powderchaser
I am looking to monitor a small 4 frequency Turbo Digital system (Might be trunked) of a ski area and have the frequencies but no key codes. IF i were to purchase a Motorola Turbo radio and put the Freq's in it is it unlikely that I would be able to hear anything? Is there any way of idetifying the codes or a scanner that can pick this up?