Measuring Analogue Rx I/Q Signals Using Oscilloscope - Nokia RH-47 Series Rf Description And Troubleshooting

Nokia Customer Care
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Please refer to the fault-finding chart and Appendix C for proper levels at different test
points.

Measuring analogue RX I/Q signals using oscilloscope

Measuring with an oscilloscope on "RXIINN" or "RXQINN" is recommended only if RSSI
reading does not provide enough information. There are dedicated test points for RX I
and Q signals. Apply an Input signal level of -80dBm.
1 Start Phoenix Service Software and open FBUS connection:
Select
Wait until phone information is shown in the lower right corner of the screen.
2 Set operating mode to local mode:
Select
Wait until the RF Controls window is pops up.
3 In the RF Controls window:
Select
Following picture should be displayed on an oscilloscope' s screen if the GSM850
Issue 1 05/04
Company Confidential
7 - RF Description and Troubleshooting
Band
Active unit
Operation mode
RX/TX Channel
Scan Product
Maintenance
Testing
Band
Active unit
Operation mode
RX/TX Channel
AGC
Copyright © 2004 Nokia Corporation
Company Confidential
GSM850 or GSM1900
RX
Continuous
190 or 661
Ctrl-R
Alt-M
T
RF Controls F
GSM850 or GSM1900
RX
Continuous
190 or 661
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RH-47
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