Spectrum Analyzer Mode
R&S
®
Spectrum Rider FPH
205
User Manual 1321.1011.02 ─ 11
When demodulating an AM modulated signal, the R&S Spectrum Rider turns the video
voltage into an audible sound. You should therefore set the reference level to about the
level of the signal that you are demodulating.
If you perform measurements in the time domain, the R&S Spectrum Rider demodu-
lates continuously. In the frequency domain, you can define a time period the R&S
Spectrum Rider demodulates the signal at the marker frequency. The frequency sweep
then stops at the marker frequency for that time before finishing the sweep.
1. Press [MARKER] key.
2. Select "Marker Function" key.
3. Select the "AM" or "FM" demodulation scheme you require from the menu.
The R&S Spectrum Rider starts to demodulate the signal.
Defining the demodulation time period
1. Press [MARKER] key.
2. Select "Marker Function" softkey.
3. Select the "Time" menu item.
The R&S Spectrum Rider opens an input field to define the demodulation time.
4. Enter the demodulation time you need.
The range is from 100 ms to 500 s. In time domain, the R&S Spectrum Rider
demodulates continuously, i.e. the demodulation time is not relevant.
Controlling the volume
1. Press [MARKER] key.
2. Select "Marker Function" softkey.
3. Select the "Volume" menu item.
The R&S Spectrum Rider opens an input field to define the demodulation volume.
4. Enter the volume you are comfortable with.
The demodulation volume is a percentage (0 % to 100 %) with 100 % being full
volume.
For more information on general volume control, see
Mute function
► Select the speaker icon to mute or unmute the volume.
The speaker icon is located at the top right-hand corner of the trace window. It
appears only when "Marker Function" is set to "AM" or "FM" demodulation scheme.
Configuring Spectrum Measurements
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