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Chapter 8 265
Signaling Encoder and Decoder - Screens and Control Fields
Control Fields for the Signaling Encoder and Decoder
Frequency
This measurement displays the decoded signal’s frequency.
Screens Where Field is Present
SIGNALING DECODER (Modes: Func Gen)
Gate Time
This field specifies how long the decoder analyzes a signal after it has
been triggered. Up to 65 seconds of gate time can be specified. The gate
time should be set long enough to allow the preamble and all necessary
data bits to be captured.
Operating Considerations
If the gate time is too long, the decoder’s data buffer becomes full. A
message is displayed instructing you to decrease the gate time.
This function is not used with the NAMPS-NTACS RVC decoder.
Screens Where Field is Present
SIGNALING DECODER (All Modes)
Hi Tone
This for the high frequency tone in each tone pair. The measurement
type is selected by selecting the Freq field to display a list of
measurement choices.
Operating Considerations
Frequency error is calculated by comparing the DTMF encoder’s
frequency settings for each tone pair with the decoded frequencies.
Screens Where Field is Present
SIGNALING DECODER (Modes: DTMF)