Chapter 3 3-9
Making GSM Base Station Measurements
Making the Output RF Spectrum (ORFS) Measurement
Figure 3-5 Output RF Spectrum (ORFS) Due To Switching Transients:
Multiple Offset Measurement
Figure 3-5 (above) shows a table of multiple offset measurements taken
during an ORFS due to switching transients measurement.
Figure 3-6 Output RF Spectrum (ORFS) Due To Switching Transients:
Swept Measurement
Figure 3-6 (above) shows a trace of a swept measurement taken during
an ORFS due to switching transients measurement. If averaging is
turned on, the display is averaged over successive sweeps until the
required number of sweeps has been reached. It then starts again with
a fresh display.
Troubleshooting Hints
The Output RF Spectrum measurement, along with the Phase and
Frequency Error measurement, can reveal numerous faults in the
transmit chain, such as the I/Q baseband generator, filters & modulator.
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