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Chapter 10, Signaling Encoder (AF Generator 2)
LTR Encoder
AFGen2 To
This audio frequency generator control contains two fields:
• The upper field determines whether the LTR Encoder’s signal modulates the RF Gen-
erator, or is output through AUDIO OUT (normally set to FM for LTR signaling).
• The lower field sets the amplitude, including Off (typically set to 1 kHz for LTR sig-
naling).
Area 1, Area 2
Enter the trunked system Area Number (0 or 1) programmed into your radio.
Audio Out
Audio output coupling selects ac or dc coupling of the LTR Encoder to the
AUDIO OUT connector when the upper
AFGen2 To field is set to Audio Out.
Bursts
This field defines the number of times Message 1 or Message 2 is output each
time Send is selected. This function works only when the Send Mode field is set
to
Burst.
Data Rate
Enter the LTR signaling data rate used for your radio. The standard and default
value is 297.6 bits-per-second.
FM Coupling
This field alters the FM modulator to allow DCFM from the LTR Encoder’s
modulation source. This field should be set to DC when testing trunked radios.
This field also selects ac or dc coupling between the RF Generator’s frequency
modulator and the rear-panel MODULATION INPUT connector.
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