User Guide

CCS Technical Documentation 7 - Troubleshooting Instructions
RH-26
Issue 1 02/04 ©Nokia Corporation Page 19
When measured with an oscilloscope on "RX_I" or "RX_Q", the following screens
should be seen on a working GSM850, GSM1800 or GSM1900 receiver:
9 Correct signal amplitudes approximately:
• GSM850~190mVpp
• GSM1800~140mVpp
• GSM1900~160mVpp
Signal part frequency 67,7110 kHz sine.
DC level of signal part is 1,30V. DC level can variate about +/- 100mV between I
and Q signals and between different bands as well.
View of GSM1900 continuous mode RX I and Q signals measured from test points
RXI and RXQ simultaneously.