Radio Shack PRO-2055 User Manual page 23

The Basics
this talk group information is also transmitted as
subaudible data on each active channel.
When the scanner receives a transmission on a channel
set to the Motorola mode, it fi rst decodes the talk
group ID data included with the transmission. In the
open mode, the scanner stops on the transmission
and displays the talk group ID on the bottom line of
the display. In the closed mode, the scanner only stops
on the transmission if the talk group ID matches a talk
group ID that you have stored in the bank's talk group
ID list and have not locked out.
Motorola trunking systems come in three categories:
Type I, Type II, and Type I/II Hybrid. Each category
displays and uses talk group IDs in slightly different
ways.
Motorola Type II IDs are in the form FFF-SS, where;
FFF=Fleet ID
SS=Subfl eet ID
Type I systems are usually organized with different user
groups assigned to different fl eets.
For example, a valid fl eet-subfl eet ID identifying
Note Note
all detectives within a police department might be
000-12, where 000 identifi es all police users and 12
identifi es the Detective division.
Tuning the scanner to an active control channel
while in Motorola mode will display the Motorola
System. ID and the approximate control channel
message decode success rate. This information can
help you identify the Motorola trunking system that
you are monitoring and the receive quality of the
control channel signal.
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