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Understanding Scanning and the BCD996T
radios in that talk group will switch to the correct channel. To program an EDACS
system in your scanner, you will need to know both the frequencies used by the
system and the LCN for each frequency.
Agency-Fleet-Subfleet — talk group ID’s for EDACS systems are assigned in a
way that makes it easy to see at a glance the affiliation of the user. Each radio is
assigned a 2-digit agency identifier from 00 — 15. For example, 01 might be used
by the police, 02 by the ambulance service, 03 by the fire department, and so on.
Each agency is then subdivided up to 16 times to provide 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 BCD996T
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 — (Single Channel Autonomous Trunking) systems operate on a
single channel and alternate control data with analog voice traffic. While your
BCD996T 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
sub audible 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)
When the scanner receives a transmission on a channel set to the LTR mode, it
first decodes the LTR data included with the transmission. In the ID search mode,
the scanner stops on the transmission and displays the talk group ID on the
display. In the ID scan mode, the scanner only stops on the transmission if the LTR
UB335ZH.book Page 27 Friday, March 17, 2006 4:35 PM