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100

Appendix A - Establishing Absolute GSM BCH Power Level

Procedure

7 Set the Traffic Chan field to . This will remove the pulsing from the

BCH channel.

8 On the front panel of the HP/Agilent 8922, press to select to Cell Configura-

tion screen.

9 Set the GSM BCH Atten.field to .

10 Change the top left field to . This will change the BCH modulation to

all 1’s.

11 On the front panel of the HP/Agilent 8922, press Press (RFG/RFA).

12 From the Mod Source menu set the GMSK field to . This will turn the BCH

modulation off, so that the BCH is a clean CW signal.

HP/Agilent 8560 Series Set up and Measurement

1 Set the spectrum analyzer test frequency.

a Press key.

b Press softkey CENTER FREQ and enter 939 MHz ( )

2 Set the spectrum analyzer test span.

a Press key.

b Press softkey SPAN and enter 1 MHz ( )

3 Set the spectrum analyzer attenuation and reference level.

a Press key.

b Press softkey ATTEN to change setting to MAN.

c Enter 0 dB ( )

d Press softkey REF LVL, then using the arrow keys ( ), move the signal peak

to the highest graticule. Change the graticule scale if neccessary.

WARNING: Once these settings have been made, the spectrum analyzer is now vulnerable to

overload damage.

4 To obtain a peak GSM BCH power level value, press and read the value

given at the top of the spectrum analyzer display.

ON/OFF

CELL

CONFIG

0 dB

Settable

SHIFT

CELL

CNTL

Off

FREQUENCY

9 3 9

MHz

-dBm

sec

SPAN

MHz

-dBm

sec

AMPLITUDE

GHz

+dBm

PEAK

1 2 ... 92 93 94 95 96 97 98 99 100

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Agilent Technologies 8922S Guía de usuario Pagina 97

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