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Chapter 8, Signaling Decoder Screen
Tone Sequence Decoder
Freq
This measurement column lists the tone frequency for each symbol received in the
tone sequence.
Freq Error
This measurement column lists the frequency difference between the tone
frequency specified for each symbol in the Tone Sequence Encoder screen and the
frequency measured for each symbol in the Tone Sequence Decoder screen.
Operating Considerations
The decoder and encoder Standard fields are interactive. The standard you
choose in either field is automatically selected for the other.
Gate Time
This field specifies how long the decoder analyzes a signal after it has been
triggered.
Input Level
This field specifies a tone’s “on” signal level that you input (after de-emphasis if
used). The higher the level of signal expected by the analyzer, the higher the
trigger level is set.
Operating Considerations
The unit-of-measure is determined by the AF Anl In setting.
The input level should be set high enough to prevent false triggering, but low
enough to allow triggering for every desired tone received.
If de-emphasis is used (by setting the AF Analyzer’s
De-Emphasis field to
750 µs), the Input Level should be set to about 1/5 of the measured signal’s
level. For example, a 1 kHz, 1 Vpeak sinewave into the AF Analyzer input
requires an
Input Level of approximately 0.212 V to trigger correctly.
See Also
Trig Level
field description, on page 283
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