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Chapter 8, Signaling Decoder Screen
Using the LTR Decoder
Using the LTR Decoder
Decoding Mobile Radio Signaling Data
A transmit channel must be established before a mobile radio is tested (otherwise
the transmitter will attempt to transmit but time-out and de-key automatically). A
procedure for establishing a trunked transmit channel is provided in "Using the
LTR Encoder" on page 346
.
After establishing a trunked transmit channel, keep the transmitter keyed and
perform the following steps.
1. Access the DECODER screen, and select LTR for the Mode.
2. Set the LTR display field to Radio.
3. Set the Single/Cont field to Single.
4. Set the AF Anl In field to FM Demod.
5. Set the Input Level to 1 kHz.
6. Select Arm Meas to prepare the decoder for triggering. The transmitted data should be
displayed after being computed.
An End of Data reached during decode. message may be displayed at
the top of the screen during decoding. Four conditions usually cause this message
to be displayed:
•The Gate Time is too short to decode all the data. Increase this setting.
•The Input Level is set too low or too high. Change the level.
• The trunking data is inverted. Select Invert in the Polarity field.
• The LTR radio is not transmitting. Re-establish a transmit channel.
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