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Chapter 2, Making Measurements
Transmit Spectrum
Transmit Spectrum
Overview It is often useful to look at the transmitter signal with the spectrum analyzer to see
its overall symmetry and occupied bandwidth, and to identify potential sources of
interference. This section details two methods for accessing the spectrum
analyzer:
• Go to the spectrum analyzer with the current channel as the center frequency, see
"Steps: Go to Spectrum Analyzer @ Present Chan" on page 37
• Go to the spectrum analyzer after entering a new center frequency, see "Steps: Go to
Spectrum Analyzer & Enter Freq" on page 38
Figure 16
CAUTION: Before performing any transmitter measurements, make sure that the power level applied
to the RF IN/OUT port of the PCS Interface does not exceed the published limit. For
CDMA base station signals this is 1 Watt (+30 dBm). You may have to use an external
attenuator or directional coupler, depending on the power output for your transmitter.
Signal levels greater than the specified maximum can cause damage to the test equipment.
NOTE: The test procedures outlined in this section require that you have already configured the
Test System as outlined in chapter 1, "Getting Started".
Requirements • You must have a means of turning on the base station transmitter with modulation (if
looking at the transmitted signal).
• You must know the following about the base station and setup:
❒ The base station channel number setting (if looking at the transmitted signal).
H
H
RF IN/OUT
Transmitter Port