RSA306 USB Real-Time Spectrum Analyzer Demo Guide
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Demo 1: FM listening
The RSA306 Series USB Spectrum Analyzers can demodulate audio signals, which can help you to
identify unknown radio signals. You access the Audio Demod tab from the Settings control panel of the
DPX Spectrum plot display. This Demo shows how to use RSA306 to demodulate the local FM radio
signals and listen to your programming.
1. In the Presets button.
2. In the DPX display, set the CF to 97.75 MHz and
the Span to 20.5 MHz.
3. Set the RefLev to -30 dBm.
4. Right click the screen, and click Marker to peak.
5. Click To Center in the bottom marker setting area.
This sets the center frequency of the analyzer to
the center of the signal.
6. Click the Audio settings.
7. Select FM – 200 kHz as the demodulation.
8. Click Run to start listen to the FM radio.
9. Adjust the Audio Gain setting so you can hear the
demodulated signal. Note that the sound level is
also affected by the Windows volume control.
10. Click the Browse… button to select the location
you want to save the steam file.
11. Enable the Activate button to start save the
steaming audio, and disable the activate button
when you want to stop saving. The saved .wav file
can be played by windows media player.
Please also try to drag the marker to other peaks, and
listen to the programming at other channels.
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