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EDACS SCAT – EDACS SCAT (Single Channel
Autonomous Trunking) systems operate on a single
channel and alternate control data with analog voice
traffic. While your UBCD396T 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 (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)
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 data matches a talk group ID
that you have stored in the talk group ID list and have
not locked out.
LTR systems are frequently programmed so that each
radio has a unique user ID.
LTR Trunking
Understanding Scanning
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