Specifications

96 Chapter 11
Demodulating AM and FM Signals
Demodulating an AM Signal Using the ESA Series
Demodulating AM and FM Signals
Demodulating an AM Signal Using the ESA
Series
The demodulation functions listed in the menu under Det/Demod allow
you to demodulate and hear signal information displayed on the
analyzer. Simply place a marker on a signal of interest, set the analyzer
in zero span, activate AM demodulation, turn the speaker on, and then
listen.
NOTE AM demodulation is not available on the PSA Series spectrum
analyzers.
Step 1. Perform a factory preset:
Press
Preset, Factory Preset (if present).
Step 2. Connect an antenna to the analyzer input.
Step 3. Select a frequency range on the analyzer, such as the range for AM
radio broadcasts. For example, the frequency range for AM broadcasts
in the United States is 550 kHz to 1650 kHz:
Press
FREQUENCY, Start Freq, 550, kHz, Stop Freq, 1650, kHz.
Step 4. Place a marker on the signal of interest (see Figure 11-3):
Press
Peak Search, Next Pk Right or Next Pk Left.
Figure 11-3 AM Broadcast Signals
Step 5. Set the frequency of the signal of interest to center frequency:
Press
Peak Search, Next Pk Right or Next Pk Left (as necessary), Marker→,
and
Mkr→CF.
Step 6. Reduce the span to 1 MHz by using the step down key (↓) and Mkr→CF