Am/Fm Demodulation; Demodulation Procedure - Anritsu spectrum master ms2711d User Manual

Chapter 5 Field Measurements

AM/FM Demodulation

The Spectrum Master built-in demodulator for AM, narrowband FM, wideband FM and
single sideband (selectable USB and LSB) allows a technician to hear an interfering signal
for easy identification. The demodulated signal can be heard using either the built-in
speaker, or through a monaural headset connected to the 1/8-inch jack on the test panel.

Demodulation Procedure

Step 1. Press the MEAS key followed by the More soft key and the AM/FM Demod
soft key.
Step 2. Press the Demod Type soft key and select AM, FM Wide Band, FM Narrow
Band, SSB Lower, or SSB Upper to match the modulation format of the sig-
nal.
Figure 5-13 . Select Demodulation Type
Step 3. Press the Back soft key.
Step 4. For AM or FM signals, press the Demod Freq soft key and use the keypad to
enter the center frequency of the signal to be demodulated. By default, the de-
modulation frequency is the center of the frequency span.
For SSB Upper and SSB Lower signals, press the Demod Freq/BFO Adj. soft
key. By default the demodulation frequency is the center of the frequency span.
If the demodulation frequency needs to be changed, press the Demod Freq soft
key and enter the correct demodulation frequency. The BFO Adjust soft key al-
lows adjustment of the beat frequency oscillator to fine tune the signal through a
span of ±10000 Hz.
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