Measuring The Modulation Rate Of An Am Signal - Keysight X Series Measurement Manual

Demodulating AM Signals

Measuring the Modulation Rate of an AM Signal

Measuring the Modulation Rate of an AM Signal
This section demonstrates how to determine parameters of an AM signal, such as
modulation rate and modulation index (depth) by using frequency and time domain
measurements (see the concepts chapter
page 215
To obtain an AM signal, you can either connect a source transmitting an AM signal,
or connect an antenna to the analyzer input and tune to a commercial AM broadcast
station. For this demonstration an RF source is used to generate an AM signal.
Step
1 Set up the signal
source.
2 Connect an Keysight
ESG RF signal source
to the analyzer RF
INPUT as shown.
3 Select the mode.
4 Preset the analyzer.
for more information).
Action
a. Set the source frequency to
300 MHz.
b. Set the source amplitudes to
−10 dBm.
c. Set the AM depth to 80%.
d. Set the AM rate to 1 kHz.
e. Turn AM on.
• Press Mode, Spectrum
Analyzer.
• Press Mode Preset.
140
"AM and FM Demodulation Concepts" on
Notes