Keysight N9938-90003 User’s Guide 125
SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings
—FM Narrow Frequency Modulation; Narrow bandwidth. Choose when
interfering transmission consist of voice or data.
—FM Wide
Frequency Modulation; Wide bandwidth. Choose for high
quality music transmissions of FM broadcast radio.
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:
1. Selecting Preset > Mode Preset, sets Tune Frequency to 3.25 GHz (e.g., for
a N9914B FieldFox).
2. Specify Tune Frequency:
— Press Meas Setup 4
— Then Tune Freq
—Enter a value using the numeric keypad, arrows, or the rotary
knob. Then select a multiplier key. Learn about multiplier
abbreviations “Multiplier Abbreviations” on page 35.
3. Using Mkr->Tune Freq:
— Create a normal marker at the frequency of interest. Learn how in “How to
create Markers” on page 190.
— Press Mkr->/Tools
— Then Mkr->TuneFreq to change the Tune Frequency to that of the
marker.
Listen Time
While Tune & Listen is actively demodulating a signal, the SA does not sweep
and update the display. Listen Time sets the amount of time that the FieldFox
demodulates, then stops to perform a single sweep and update the display,
then again demodulates.
To select Listen Time:
—Press Meas Setup 4
—Then Listen Time
— Enter a value using the numeric keypad, arrows, or the rotary knob.
Then select a multiplier key. Learn about multiplier abbreviations.
To improve sound quality, try increasing power by reducing the
Attenuation setting and, if available, turn ON the Preamplifier. Learn how
in “Attenuation Control” on page 117
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