114
Measuring Digital Communications Signals
Occupied Bandwidth Measurements
Occupied Bandwidth Measurements
This section explains how to make the occupied bandwidth measurement on a
W-CDMA (3GPP) mobile station. (A signal generator is used to simulate a base
station.) The instrument measures power across the band, and then calculates its
99.0% power bandwidth.
Step Action Notes
1 Set up the signal generator. a. Set the mode to
W-CDMA.
b. Set the frequency to 1.920
GHz.
c. Set the amplitude to
−20 dBm.
2 Connect the source RF
OUTPUT to the analyzer
RF INPUT as shown.
3 Select the mode. • Press Mode, Spectrum
Analyzer.
4 Preset the analyzer. • Press Mode Preset.
5 Set the radio standard and
toggle the device to mobile
station.
• Press Mode Setup, Radio
Std, 3GPP W-CDMA,
3GPP W-CDMA, Device
(MS).
6 Set the center frequency. • Press FREQ Channel,
1.920, GHz.
7 Initiate the occupied
bandwidth measurement.
• Press Meas, Occupied
BW.
The Occupied BW measurement result
should look like “Occupied BW
Measurement Result” on page 115.
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