Chapter 2, Making Measurements

Code Domain Phase

Code Domain Phase

Overview

Similar to the Code Domain Power measurement, this measurement shows the

 

relative phase relationship of the various Walsh channels referenced to the pilot

 

channel (Walsh 0).

 

 

EVEN SECOND/

(Rear Panel)

 

SYNC IN

 

 

H

 

 

Transmitter Port

SYNTH

 

 

 

Even-second

REF IN

 

 

 

Clock

 

 

Time Base

 

 

H

 

 

 

RF IN/OUT

Figure 14

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 and bringing up various Walsh channels (such as Pilot, Sync, Traffic, and Paging).

•Synchronization is required, so you must have an Even-Second clock signal and a reference timebase (typically 19.6608 MHz) from the base station.

•You must know the following about the base station and setup:

❒The base station channel number setting.

❒The PN Offset for the base-station-under-test. If you do not know the PN Offset, determine it by selecting Search for PN Offset in the main menu.

34