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25
Understanding Scanning
full, so new users were not able to take advantage of
the technology as quickly as they wanted.
Trunking solved this frequency shortage by allowing
multiple groups to use the same set of frequencies in a
very efficient way. While each type of trunking system
operates a little differently (see the next few sections),
they all work on the same basic premise: even in a
system with a lot of users, only a few users are ever
transmitting at any one time.
Instead of being assigned a frequency, as with
conventional systems, each group is assigned a talk
group ID. A central computer controls the frequency
each group operates on...and this frequency selection
is made each time a user transmits. So, while on a
conventional system queries, replies, and follow-ups
are all on a single frequency, they could each be on
completely different frequencies on a trunked system.
This semi-random frequency assignment made
monitoring such a system impossible prior to Uniden’s
invention of the TrunkTracker scanner.
Not only does your BR330T scan channels like a
conventional scanner, it actually follows the users of a
trunked radio system. Once you know a talk group’s
ID, you won’t miss any of the action.
If you are a new scanner enthusiast, you might 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
terminology will make trunk tracking much easier. If
you are already an experienced scanner operator, you
might want to go to “Programming Motorola Systems”
on Page 69, “Programming EDACS Systems” on
Page 73, or “Programming LTR Systems” on Page 76
now.