Uniden BCD396T 사용자 설명서

24

When tracking these types of systems, you might want 
to remember these important points: 

• Your scanner can track more than one trunking 

system at a time and scan conventional and 
trunked systems at the same time. 

• The frequencies for many of the 800 MHz public 

safety systems are listed in the National Public 
Safety Trunked System Frequency Guide included 
with your BCD396T scanner.

Conventional scanning is a simple concept. You enter 
a frequency used by someone you want to monitor into 
your scanner’s memory. For example, the police in your 
area might transmit 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. 

However, as the demand for public communications 
has increased, many public radio users do not have 
enough frequencies to meet their needs, creating a 
serious problem. Trunking radio systems help solve 
this problem. 

While conventional scanning worked great while there 
were only a few groups wanting to use the 
frequencies, with the advent of smaller, lower-cost 
radios more and more agencies and businesses 
wanted to take advantage of the utility of 2-way radio. 
As a result, the bands that were used most became 
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