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About Your Scanner
FM Mode
This sets the scanner to receive transmissions using fre-
quency modulation (FM). FM is used for most public
safety transmissions, as well as broadcast, business,
and amateur radio transmissions. When the scanner re-
ceives a transmission on a channel set to the FM mode,
it always stops on the transmission.
LTR (E. F. Johnson) Mode
You can set your scanner so it decodes the talk group
IDs used with LTR systems. This setting is called the
LTR mode
.
LTR 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 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 in-
cluded 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
radio has a unique ID code.
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