Tektronix SPECMON3 Manual page 98

General Signal Viewing
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 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
On/Off
Audio Gain
AM
FM
Tune with
Receiver Freq
Receiver BW
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 > Define Markers to display the Define Markers control panel.
2. Select Add to turn on the next marker.
86
Description
Enables/disables audio demodulation.
Adjusts the volume of the demodulated audio.
Selects Amplitude Modulation as the demodulation method.
Selects Frequency Modulation as the demodulation method.
Specifies how the frequency to be demodulated is specified. You can select markers
or the frequency control.
Readout of the frequency to be demodulated.
Adjusts the equivalent receiver bandwidth for the audio demodulation. The range of
values is 1 kHz to 500 kHz.
SPECMON3 & SPECMON6 Printable Help
Audio Demod Tab