Uniden UBCT8 Owner's Manual page 9

Sharing of the available public service frequencies, or trunking, allows cities, counties, or
other agencies to accommodate hundreds of users with relatively few frequencies. Following
a conversation on a trunked system using a scanner is difficult, if not impossible. Because
when there's a short break during the conversation you're monitoring, it's possible that the
talkgroup will be assigned to a completely different frequency in the trunked system. This
type of scanning is difficult and frustrating.
changes this! Not only does your new UBCT8 scan channels like
TrunkTracker Technology
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.