Uniden UBC 245XLT manual Trunk Tracking, Types of Trunking Systems

Trunk Tracking

Your UBC245XLT is designed to track Motorola Type I, Type II, Hybrid, SMARTNET™, PRIVACY PLUS™, and EDACS® analog trunking systems* on any band. When tracking these types of systems, you may want to remember these important points:

■Your scanner defaults to monitor Motorola Type II systems; however, you can change this if the system in your area is different. (The types of systems are discussed below.)

■If you have internet access, you can visit www.trunktracker.com or www.bearcat1.com/free.htm for current news and frequency information about Trunk Tracking Scanning.

■You may experience slight interference in some 900 MHz frequencies, which may be reduced by moving away from strong transmission sources.

*Motorola, SMARTNET, and PRIVACY PLUS are trademarks of Motorola Inc. EDACS is a registered trademark of the Ericsson Corporation.

Types of Trunking Systems

Trunking systems divide a few frequencies among many different users, but the way that each system does this is slightly different. There are really two types of trunking systems (other than EDACS) which are important when using your TrunkTracker™ scanner. These are usually referred to as Type I and Type II systems. Type I only occurs on some 800 MHz systems. All VHF, UHF and 900 MHz trunking systems (other than EDACS) use Type II.

One important distinction between these two systems is the amount of data transmitted by each radio when its push-to-talk button (PTT) is pressed. Every radio in a trunked system is assigned a unique ID so the central site computer can identify it when it’s used. Both Type I and Type II systems place radios (or radio users) into groups, called talk groups, and these talk groups are also assigned unique IDs. Some radios have access to only one talk

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