Chapter 3 3-11
Making GSM Base Station Measurements
Making the Phase and Frequency Error Measurement
• Measurement setup parameters.
These are measurement specific parameters changed using the
Measurement setup (
Meas Setup) menu. Parameters can be returned
to default settings at any time by pressing
Meas Setup, More (1 of 2)
and
Restore Meas Defaults. For further information on measurement
setup parameters, refer to the ESA Series Spectrum Analyzers GSM
Measurement Personality User’s Guide.
Results
Figure 3-7 Phase and Frequency Error Result - I/Q Quad view
Figure 3-8 Phase and Frequency Error Result - I/Q Measured view
Troubleshooting Hints
Poor phase error indicates a problem with the I/Q baseband generator,
filters, or modulator in the transmitter circuitry. The output amplifier
in the transmitter can also create distortion that causes unacceptably
high phase error. In a system, poor phase error will reduce the ability of
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