Nokia RM-12 Troubleshooting Instructions page 24

CCS Technical Documentation
Measuring with an oscilloscope on "RXI" or "RXQ" following screens should be seen on a work-
ing GSM900, GSM1800 or GSM1900 receiver:
Receiver I or Q burst mode signal (channel 37) measured from testpoint RXI or RXQ with
942.46771 MHz signal, input level –90dBm at RF-connector.
Correct signal amplitudes approximately:
• GSM900~170mVpp
• GSM1800~140mVpp
• GSM1900~160mVpp
Signal part frequency 67.7kHz sine.
DC level of signal part is 1.35V. DC level can variate about +/-100mV between I and Q signals
and between different bands as well.
22
RX I/Q signal, burst mode, input level –90dBm
Figure 1:
COMPANY CONFIDENTIAL
Copyright © 2004 Nokia. All Rights Reserved.
RM-12
Issue 1 11/2004