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Chapter 10, Signaling Encoder (AF Generator 2)
CDCSS Encoder
AFGen2 To
This audio frequency generator control contains two fields:
• The upper field determines whether the CDCSS Encoder modulates the RF Generator,
or is output through AUDIO OUT.
• The lower field sets the amplitude (including Off).
Audio Out
Audio out coupling selects ac or dc coupling of the encoder to the AUDIO OUT
connector when the upper
AFGen2 To field is set to Audio Out.
Operating Considerations
The CDCSS encoder creates data streams using squarewaves. For optimum
waveform quality, set this field to
DC when using the AUDIO OUT connector.
This is especially beneficial at low data rates.
Bursts
This field defines the number of data streams output each time Send is selected.
This function works only when the
Send Mode field is set to Burst.
Code
This field defines the 3-digit octal code used to identify the radio being accessed.
Data Rate
This field specifies how fast the data stream is output in bits-per-second.
This setting is also used to determine the Turn Off Code frequency
(TOC frequency Hz = Data Rate in bps). Example: 1000 bps = 1 kHz
Operating Considerations
This field is also used by the CDCSS Signaling Decoder screen to approximate
the data rate for the signal being decoded.
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