Chapter 4
119
Making Measurements
Making the Channel Power Measurement
Troubleshooting Hints
If an external attenuator is used, be sure to include its attenuation in
the measurement of the channel power. Use the Ext Atten key.
The channel power measurement, very often along with the adjacent
channel power ratio measurement and/or spectrum measurement, can
reveal degraded or defective parts in the transmitter section of the
UUT. The following examples are those areas to be checked further.
• Some faults in the DC power supply control of the transmitter power
amplifier, RF power controller of the pre-power amplifier stage,
and/or I/Q control of the baseband stage.
• Some degradation in the gain and output power level of the amplifier
due to the degraded gain control and/or increased distortion.
• Some degradation of the amplifier linearity and other performance
characteristics.
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