Anritsu S113C Guia do Utilizador descarregar pdf (Página 88)

Step 9. Select the MAIN CHANNEL BW soft key, and enter the main channel bandwidth.

For the GSM signal, enter 2.0 MHz.

Step 10. Select the

ADJ CHANNEL BW soft key, and enter the adjacent channel band

width. For the GSM signal, enter 30 kHz.

Step 11. Select the

CHANNEL SPACING soft key, and enter the channel spacing. For the

GSM signal, enter 19.5 MHz.

Step 12. Make the measurement by pressing the

MEASURE ON/OFF soft key. The detec

tion method is automatically changed to Average. Solid vertical lines are drawn

on the display to indicate the main channel. Dashed vertical lines define the ad

jacent channels. The Site Master will display the measurement results.

Figure 5-8 shows the results of the measurement using a GSM signal source with an output

power level of –35 dBm.

Adjacent Channel Power Ratio is a constant measurement. Once it is turned on, it will re

main on until it is turned off by pressing the MEASURE ON/OFF key again. When the

ACPR measurement is on, an

ACPR icon appears to the left of the display. ACPR is calcu

lated at the end of a sweep. An hourglass is displayed as the calculations are performed.

5-16

Chapter 5 Spectrum Analyzer Measurements

Figure 5-8. GSM Adjacent Channel Power Measurement

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Anritsu S113C Guia do Utilizador Página 88