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26
Understanding Scanning
fleet identification, and then 8 more times to identify
subfleets.
For example, the complete AFS for the Police
Department West District’s dispatch channel might be
01-062. 01 identifies the agency as the police
department, 06 identifies the fleet as the West district,
and 2 identifies the subfleet as the dispatch channel.
While these assignments are somewhat arbitrary and
vary from system to system, there are many resources on
the web for finding the assignments for most systems.
Because of the logical hierarchy of the AFS system, your
BC246T lets you assign wildcard ID’s that let you, for
example, use only one ID memory to identify all units in
either an agency or a fleet.
EDACS SCAT – EDACS SCAT (Single Channel
Autonomous Trunking) systems operate on a single
channel and alternate control data with analog voice
traffic. While your BC246T cannot track ID’s in this
system, it can eliminate the control data so that all you
hear is the voice transmissions when you monitor this
type of system.
LTR Trunking
LTR (Logic Trunked Radio) systems are trunking systems
used primarily by business or private communications
service providers, such as taxicabs, delivery trucks, and
repair services. These systems encode all control
information as digital subaudible data that accompanies
each transmission, so there is no separate control
channel. Users on an LTR system are assigned to
specific talk groups, which are identified by the radio as
six digit numbers.
These numbers are in the form AHHUUU, where:
A = Area code (0 or 1)
H = Home repeater (01 through 20)
U = User ID (000 through 254)