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Chapter 8 273
Signaling Encoder and Decoder - Screens and Control Fields
Control Fields for the Signaling Encoder and Decoder
Pre-Emp
This field determines whether the encoder’s signal passes through or
bypasses the 750 ms pre-emphasis network. Pre-emphasis may be
required when testing some FM receivers.
Pre-emphasis, when used, attenuates the lower frequency tone
(1200 Hz at 1200 bps) to 2/3 of the AF Gen2 To field level setting.
See Also
“Twist” on page 279
Screens Where Field is Present
SIGNALING ENCODER (Modes: DTMF)
RECC Data (hex)
This display field lists the decoded data serially as it is received. This is
the same information that the AMPS-TACS Data (hex) measurement
displays.
Screens Where Field is Present
SIGNALING DECODER (Modes: AMPS-TACS, NAMP-NTAC)
SAT Freq (FVC)
This field is available only in AMPS-TACS mode.
This field sets the supervisory audio tone’s frequency. This signal is sent
continuously whenever the FVC is selected, except while the Message is
being sent.
Screens Where Field is Present
SIGNALING ENCODER (Modes: AMPS-TACS, NAMP-NTAC)
SAT Level (FVC)
This field sets the supervisory audio tone’s level. The unit-of-measure
depends on the AFGen2 To setting.
Operating Considerations
SAT is turned off while the FVC message stream is being sent.
Screens Where Field is Present
SIGNALING ENCODER (Modes: AMPS-TACS, NAMP-NTAC)