General Signal Viewing > DPX Spectrum
Audio Demod Tab
Audio Demod Tab
Audio demodulation can help you identify unknown radio signals. You control the audio demodulation
function with the Audio Demod tab. You access the Audio Demod tab from the Settings control panel of
the DPX Spectrum display.
NOTE.
Audio Demodulation is available only in real-time acquisition mode (not swept acquisition), and
the Trigger mode must be set to Free Run (not Triggered).
Setting
Description
On/Off
Enables/disables audio demodulation.
Audio Gain
Adjusts the volume of the demodulated audio.
AM
Selects Amplitude Modulation as the demodulation method.
FM
Selects Frequency Modulation as the demodulation method.
Tune with
Speci
fi
es how the frequency to be demodulated is speci
fi
ed. You can select markers
or the frequency control.
Receiver Freq
Readout of the frequency to be demodulated.
Receiver BW
Adjusts the equivalent receiver bandwidth for the audio demodulation. The range of
values is 1 kHz to 500 kHz.
xxx
AM / FM
Note that these buttons select the demodulation method; they do not specify a frequency band.
Tune with
The choices for this setting are: one of the markers (MR, M1, M2, M3, M4) or the Frequency control
(either the front-panel knob or the Freq control in the application).
To use a marker to specify the frequency to be demodulated:
1.
Select
Markers
>
De
fi
ne Markers
to display the De
fi
ne Markers control panel.
2.
Select
Add
to turn on the next marker.
RSA6100A Series Real-Time Spectrum Analyzers Help
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