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NHL-10

RF Troubleshooting CCS Technical Documentation

ISSUE 2 01/2004 COMPANY CONFIDENTIAL 3

Table of Contents

Page No

Introduction ...................................................................................................................5

General troubleshooting ................................................................................................ 6

RF Key Component Placement ..................................................................................... 7

Receiver Troubleshooting .............................................................................................9

General Description .................................................................................................... 9

General Instructions for RX Troubleshooting ..........................................................10

Measuring RX I/Q signals using RSSI ................................................................... 10

Measuring RX performance using SNR measurement ........................................... 11

Measuring the RX module manually using Oscilloscope and Spectrum Analyzer 12

GSM900 .................................................................................................................. 12

GSM1800 ................................................................................................................ 14

GSM1900 ................................................................................................................ 15

Measurement points in the Receiver ...................................................................... 17

Tuning of the RX Using Phoenix ................................................................................ 19

RX Channel Select Filter Calibration ....................................................................... 19

RX Calibration .......................................................................................................... 19

RX Band Filter Response Compensation .................................................................. 22

Transmitter Troubleshooting ....................................................................................... 25

General Description .................................................................................................. 25

Preparation for Fault Finding .................................................................................... 26

Fault-finding chart: TX-BB interface and control signals ...................................... 28

Fault-finding chart: RF side of transmitter ............................................................. 29

Transmitter Tuning ...................................................................................................... 30

Introduction ............................................................................................................... 30

TX IQ Tuning ............................................................................................................ 30

TX Power Level Tuning ...........................................................................................34

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