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(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 trunking information as
digital subaudible data that accompanies each transmission.
Users on an LTR system are assigned to specific talkgroups,
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 talkgroup ID on the
display. In the ID Scan mode, the scanner only stops on the
transmission if the LTR data matches a talkgroup ID that you
have stored in the bank’s talkgroup ID list and have not
locked out.
LTR systems are frequently programmed so that each radio
has a unique ID code.
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