Trunking Radio Systems
Trunking is a type of radio system. It is largely controlled by microprocessors to perform it's task. Each radio that is to be used on the network has to be programmed to be on the correct network with all the other trunking stations, for a courier service for instance. The frequency is NOT fixed however.
Once any one station on the network transmits the base unit allocates a frequency to the mobile station and that frequency is used by all other stations until everyone has finished talking. Once the base unit has stopped transmitting that frequency is cleared. A trunking system works like a big repeater system though. All communications are two-way, however you are talking through the base station trunking system. You aren't talking directly to any other one station. Trunking base stations are generally positioned on the tops of city buildings for the best radio range.
It is now possible to follow trunked radios around the airwaves with more modern sophisticated scanners.
Updated on Saturday, September 10th, 2011