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Chapter 8, Signaling Decoder Screen
LTR Decoder
LTR Display
• Radio - displays the mobile’s transmitted trunking data. An example display might
look like this:
Area : 0
Goto : 2
Home : 2
ID : 128
Free : 31
• Repeater - lists the 20 possible repeater numbers in an LTR system. The data from
the monitored repeater is displayed. If multiple radios try to access the repeater during
decoding, the data sent to those radios by that repeater is also displayed.
The data is displayed as a series of digits next to the number of the repeater that sent it.
For example, a decoded message with a Goto number of 02 may look like this:
01: 02: 0020212806
03: 04:
04: 05:
~ ~
This is interpreted as follows:
02: 0 02 02 128 06
Repeater Area Goto Home ID Free
Polarity
This setting is used to match the polarity of the encoded signal being analyzed.
Normal Operation. When this field is set to
Norm, a logical high (1) is displayed
when a positive peak in the received signal is detected. A negative peak displays a
logical low (0).
Inverted Operation. When this field is set to
Invert, a logical high (1) is
displayed when a negative peak in the received signal is detected. A positive peak
displays a logical low (0).
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