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TrunkTracker III changes this! Not only does your new BC785D scan channels like a
conventional scanner, it actually follows the users of a trunked radio system. Once you know
a talkgroups ID, you won’t miss any of the action.
If you're a new scanner enthusiast, you may want to read the first part of this manual and
use your scanner in conventional mode before you begin trunk tracking. Understanding
scanning fundamentals and its terminology will make trunk tracking much easier. A glossary
of other commonly used terms is provided in the back. (Refer to the "Glossary of Terms"
section.) But if you're already an experienced scanner operator, you may want to skip to
Programming and Receiving Digital and Trunked Systems on page 46.
What is APCO Project 25 Digital Communications?
APCO Project 25 is a modulation process where voice communications are converted into
digital communications. This conversion is similar to the technology used with digital mobile
phones. There are several types of project 25 systems available!
- Conventional – one frequency with digital voice.
- Trunked with analog control channel and digital voice – control channel operates at 3600
Baud.
- Mixed Mode – trunked system with an analog control channel alternating/mixing analog
and digital voice communications.
- Trunked with digital control channel and digital voice. Control channel operates at 9600
Baud. (This type of APCO P-25 System is not supported with this radio.)
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