Terminology; What Is Scanning; What Is Searching; What Is Trunk Tracking - Uniden UBC3300XLT Owner's Manual

Terminology

What is Scanning?

Unlike standard AM or FM radio stations, most two-way
communications do not transmit continuously. The
UBC3300XLT scans the Frequencies you have programmed
into the Scanner's channels until it finds an active frequency.
Scanning stops on an active frequency and remains on that
channel as long as the transmission continues. When the
transmission ends, the scanning cycle resumes until another
transmission is received.

What is Searching?

The UBC3300XLT can search each of its 22 bands to find
active frequencies. This is different from scanning because
you are searching for frequencies that have not been
programmed into your Scanner's channels. The scanner
automatically chooses between two speeds while searching.
Turbo Search, can search the VHF FM bands at up to 300
steps per second.

What is Trunk Tracking?

Conventional scanning is a simple concept. You enter a radio
frequency in your scanner's memory which is used by
someone you want to monitor. For example, the police in your
area may broadcast on 460.500 MHz, the fire department on
154.445 MHz, the highway department on 37.900 MHz, etc.
So when your scanner stops on a frequency, you usually
know who it is, and more importantly, you can stop on a
channel and listen to an entire conversation. This type of
scanning is easy and fun.
As the demand for public communications has increased,
many public radio users don't have enough frequencies to
meet their needs, and this has created a serious problem.
Trunking radio systems solve this problem.
In a trunked radio system, which contains up to 28 different
frequencies, radio users are divided into groups, often called
talkgroups, and these talkgroups are assigned specific IDs.
When someone in a talkgroup uses their radio, a brief burst
of data is broadcasted before each transmission. The trunking
system computer uses this data to temporarily assign each
radio in a talkgroup to an available frequency. If the group
using a frequency stops broadcasting or pauses between
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