How To Select Analog Demod (Metrics) - Keysight A Series User Manual

SA (Spectrum Analyzer) Mode (Option 233–Mixed Analyzers)
SA Mode Settings

How to select Analog Demod (Metrics)

Analog demodulation can demodulate AM DSB, AM SSB, FM, FM Stereo /
RDS, PM signals. Under analog demodulation metrics the following
information is reported for each signal type: Carrier power, modulation rate,
SINAD, THD, plus deviation, depth, or RMS depending on the signal. Metrics
also displays the demodulated signal and the audio frequency spectrum.
Learn more,
— Press Measure 1 >
—
IMPORTANT! The FieldFox contains only one speaker that supports mono
audio output (i.e., if you play a stereo WAVE file, the Left and Right
channels are output in mono audio). If you want to output a stereo WAVE
file in stereo (to hear the left and right channels separately on the FieldFox)
you have to use the headphone jack and stereo headphones (i.e., most
earbuds, headphones, etcetera support stereo). Learn more, see also
Chapter 30, "System Settings."
When FM Stereo /RDS is selected as the demodulation type, a Warning
message is displayed for a fews seconds at the start of the sweep; the
sweep is 30 to 50 seconds long.
The message reads:
"Warning: Slow Measurement. RDS Measurement in Progress."
Keysight N9927-90020 User's Guide
Chapter 26, "AM/FM Metrics (SA Only and Option 355)."
Analog Demod Tune & Listen
Demod Type – Then choose a demodulation metric type. Select a setting
based on the type of interfering signal you suspect is being broadcast.
— AM – AM (double sideband). Displayed values for AM Modulation
(metrics) – (i.e., includes AM Mod Depth, AM Demod Waveform,
SINAD, THD, Carrier Power, Carrier Freq, Modulation rate).
— AM SSB – AM single sideband. Displayed values for AM SSB
(metrics) – (i.e., includes SSB RMS Level, SSD Demod Waveform,
SINAD, THD, RF Power, Modulation rate).
— FM – Displayed values for FM Modulation (metrics) (i.e., includes
Freq Deviation, FM Demod Waveform (Time)/Spectrum (Frequency),
Carrier Power, Carrier Freq, Modulation Rate, SINAD, THD).
— FM Stereo / RDS
Design System); (Metrics) – (i.e., includes Freq Deviation, FM Demod
Waveform (Time)/Spectrum (Frequency), Carrier Power, Carrier Freq,
Modulation Rate, SINAD, THD).
— PM Displayed values for PM Modulation Metrics (i.e., includes PM
Deviation, PM Demod Waveform, SINAD, THD, Carrier Power, Carrier
Freq, Modulation Rate).
and "Audio (Volume) Control" on page
– Displayed values for FM Stereo / RDS (Radio
Analog Demodulation
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