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LTR (E. F. Johnson) Mode
This sets the scanner to decode the talk group ID’s used
with an LTR system. This is a trunking system used pri-
marily by business or private communications service
providers, such as taxi cabs, delivery trucks, and repair
services. LTR systems encode all trunking information as
digital subaudible data that accompanies each transmis-
sion. Users on an LTR system are assigned to specific
talk groups, which are identified by the radio as a six-digit
number. The number is 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 includ-
ed 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 LTR data
matches a talk group ID that you have stored in the
bank’s talk group ID list and have not locked out.
LTR systems are frequently programmed so that each ra-
dio has a unique ID code.
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