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Measuring Digital Communications Signals
Making Adjacent Channel Power (ACP) Measurements
Making Adjacent Channel Power (ACP) Measurements
The adjacent channel power (ACP) measurement is also referred to as the adjacent
channel power ratio (ACPR) and adjacent channel leakage ratio (ACLR). We use the
term ACP to refer to this measurement.
ACP measures the total power (rms voltage) in the specified channel and up to six
pairs of offset frequencies. The measurement result reports the ratios of the offset
powers to the main channel power.
The following example shows how to make an ACP measurement on a W-CDMA
base station signal broadcasting at 1.96 GHz. (A signal generator is used to simulate
a base station.)
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
−10 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 analyzer radio
mode to W-CDMA as a
base station device.
a. Press Mode Setup, Radio
Std, 3GPP W-CDMA,
3GPP W-CDMA,
b. Press Mode Setup, Radio
Std Setup, Device (BTS).
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