Chapter 2, Making Measurements
Transmit Spectrum
Transmit SpectrumOverview | 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 |
| |
| • Go to the spectrum analyzer after entering a new center frequency, see "Steps: Go to |
|
H
Transmitter Port
H
RF IN/OUT
Figure 16
CAUTION:
NOTE:
Requirements
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.
The test procedures outlined in this section require that you have already configured the Test System as outlined in chapter 1, "Getting Started".
•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).
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