User`s guide

Appendix A - Establishing Absolute GSM BCH Power Level

Procedure

The following procedure can be used for determining the absolute GSM BCH

peak power level. The GSM BCH power level is the output from the RF In/Out

port along with the TCH. This output is used to synchronize calls when switching

from E-GSM900 to DCS1800 (Dual Band mode).

It is assumed that the operator is familiar with operating the HP/Agilent 8922

Multi-Band Test System and HP/Agilent 8560 Series Spectrum Analyzers.

Equipment

• HP/Agilent 8922 Multi-Band Test System

• HP/Agilent 8560 Series Spectrum Analyzer

• N-type to N-type cable

Equipment Set up

• Ensure the coupled RF In/Out has a 50 Ohm load connected.

• Connect the HP/Agilent 8922 Multi-Band Test System and ensure the system is opera-

tional.

• Connect the Spectrum Analyzer to the HP/Agilent 8922 Multi-Band Test System using

the

N-type connecting cable. Connect from the HP/Agilent 8922 Multi-Band Test System

RF In/Out port to the Input port of the spectrum analyzer.

• Switch on all instruments, allowing 30 minutes warm up time.

HP/Agilent 8922 Set up Procedure

1 Select CONFIG screen.

2 Ensure the Compatible mode is set to 8922P or 8922X. If the mode is not at either

of these settings, change this field and switch the system off then on again.

3 From the Cell Status screen, set the OPERATING MODE to E-GSM.

4 Set the OPERATING MODE (second field) to TEST MODE.

5 From the CONTROL menu, set the Broadcast On Channel to (939 MHz).

6 Set the Dual Band field to (This will change the OPERATING MODE

to DCS1800, Dual Band).

ON/OFF