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Chapter 10, Signaling Encoder (AF Generator 2)
AMPS-TACS NAMPS-NTACS Encoder
FM Coupling
306
Each
field contains 7 hexadecimal characters representing the 2 type bits
Filler
and 26 information bits of the control filler/message word. The dotting, word
sync, and parity bits are generated automatically.
Operating Considerations
The control filler is sent continuously when
control message has been sent using
whenever
Stop Filler
is selected.
AFGen2 To
Both filler fields must be full (seven digits) for the forward control channel
information to be structured correctly. Do not leave any blank spaces.
This field alters the FM modulator to allow DCFM from internal and external
modulation sources. This field also selects ac or dc coupling between the RF
Generator's frequency modulator and the rear-panel MODULATION INPUT
connector.
Send Filler
. The control message is stopped
Send
,
,
,
Filler
Channel
Data Rate
is selected, or after a
,
, or
Polarity
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