User Guide
Table Of Contents
- 7 - RF Description & Troubleshooting
- 1. RF Description and Troubleshooting
- 2. RF Implementation in NHL-12
- 3. Introduction to RF troubleshooting
- 4. Receiver Description and Troubleshooting
- 5. Transmitter Description and Troubleshooting
- 6. Additional Information on EDGE Troubleshooting
- 7. Synthesizer Description and Troubleshooting
- BACK TO MAIN PAGE
Issue 2 10/2004 COMPANY CONFIDENTIAL 19
Copyright © 2004 Nokia. All Rights Reserved.
NHL-12
7 - RF Description & Troubleshooting Nokia Customer Care
When measuring with an oscilloscope on "RXI" or "RXQ", the following screens should be seen
on a working GSM850, GSM1800 or GSM1900 receiver:
Figure 8:Rx I/Q signal, burst mode, input level –90dBm.
Figure 8, “Rx I/Q signal, burst mode, input level –90dBm.” :
Receiver I or Q burst mode signal (channel 190) measured from test point RXI or RXQ with
881.6671 MHz signal, input level –90dBm at RF-connector.
Correct signal amplitudes approximately:
GSM850~170mVpp
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.