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RH-29
6b - RF Troubleshooting
GSM1800 Transmitter
General instructions for GSM1800 TX troubleshooting
Apply an RF-cable to the RF-connector to allow the transmitted signal to act as normal.
RF-cable should be connected to measurement equipment (GSM Test equipment, Power
meter, Spectrum Analyzer, or similar).
DCS1800 Tx troubleshooting flowchart
The following diagram assumes the following:
•
Phoenix has been set up as shown previously (selecting DCS1800 in
the RF control box).
•
Relevant components have been visually inspected for orientation,
placement etc.
•
The Transmit Signal has been checked with a Spectrum Analyzer at the
RF connector, X602 and was found to be low or non-existent.
•
The VCO is running correctly.
•
The Power Amplifier is getting a correct VBATRF supply via L809.
•
Mjoelner's supply voltages VR1A, VR2, VR3, VR4, VR5 & VR7 are all
working correctly.
Path of the transmitted 1800 signal
For easy error tracking it is important to know the signal path of the GSM1800 transmit-
ter. The components can be grouped into blocks and drawn as shown below. Note that
the picture shows both EGSM900 transmitter (bottom) and GSM1800 transmitter (top).
Page 2
Company Confidential
Copyright © 2004 Nokia Corporation
Company Confidential
Nokia Customer Care
Issue 1 05/2004
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Table of Contents
Troubleshooting
