SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
— Then choose a demodulation type. Select a setting based on the type of
interfering signal you suspect is being broadcast.
— Press Meas Setup 4
> Tnl Demod Type then
— AM
– Sets AM (Double-sideband with carrier) as the modulation
type.
— FM Narrow
– Sets Frequency Modulation; Narrow bandwidth.
Choose when interfering transmission consist of voice or data.
— FM Wide
– Sets Frequency Modulation; Narrow bandwidth. Choose
when interfering transmission consist of voice or data.
— AM USB
– Sets the modulation type to AM upper side band.
Annotation: AM USB @ Center Frequency displayed at the top of
display. See also, “TnL AM SSB Gain”.
— AM LSB
– Sets the modulation type to AM lower side band.
Annotation: AM LSB @ Center Frequency displayed at the top of
display. See also, “TnL AM SSB Gain”.
See also, “How to select Analog Demod (Metrics)” on page 169.
TnL AM SSB Gain
When you select AM USB or AM LSB softkeys, the TnL AM SSB Gain softkey
becomes active.
—Press Meas Setup 4
> More then
— TnL AM SSB Gain
– sets the gain in the IF path for TnL SSB measurements
(the optimal IF path gain is automatically determined/set for regular AM
and all the other demod types, but it cannot be automatically determined
for AM SSB so it has to set it manually).
The goal is to set the gain as high as possible (to take advantage of the
range of the IF and audio paths) without distorting the audio signal. It is
recommended that you keep increasing the gain until you hear distortion in
the audio and then back off until you no longer hear any distortion.
Tune Frequency
The Tune & Listen tuner is separate from the SA display. This allows you to
listen to one frequency while displaying a different range of frequencies.
Set the Tune Frequency using one of three methods:
The system volume setting should still be used to determine the final
desired volume/level of the audio output. Learn more, see also Chapter 29,
“System Settings.” and “Audio (Volume) Control” on page 674.
Keysight N9938-90003 User's Guide
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