User Guide

Table of Contents
Introduction to RF troubleshooting .....................................................................................................................4–5
RF key components ................................................................................................................................................4–6
Receiver troubleshooting ......................................................................................................................................4–8
Introduction to RX troubleshooting................................................................................................................4–8
General instructions for RX troubleshooting..................................................................................................4–8
Receiver (RX) troubleshooting ...................................................................................................................... 4–10
GSM Rx chain activation for manual measurements / GSM RSSI measurement....................................... 4–12
Transmitter troubleshooting ............................................................................................................................. 4–14
General instructions for TX troubleshooting............................................................................................... 4–14
Transceiver (TX) troubleshooting................................................................................................................. 4–17
Synthesizer troubleshooting.............................................................................................................................. 4–18
RF tunings ............................................................................................................................................................ 4–19
Introduction to RF tunings............................................................................................................................ 4–19
Auto tuning for BB5.0 .................................................................................................................................... 4–19
System mode independent manual tunings .................................................................................................... 4–20
RF channel filter calibration.......................................................................................................................... 4–20
PA (power amplifier) detection .................................................................................................................... 4–21
GSM receiver tunings........................................................................................................................................... 4–21
Rx calibration (GSM) ....................................................................................................................................... 4–21
Rx band filter response compensation (GSM).............................................................................................. 4–24
GSM transmitter tunings..................................................................................................................................... 4–27
Tx IQ tuning (GSM).......................................................................................................................................... 4–27
Tx power level tuning (GSM) ......................................................................................................................... 4–29
List of Tables
Table 14 Rf channel filter calibration tuning limits......................................................................................... 4–20
Table 15 RF tuning limits in Rx calibration....................................................................................................... 4–23
List of Figures
Figure 16 RF key components, bottom side ........................................................................................................4–6
Figure 17 RF key components, top side ...............................................................................................................4–7
Figure 18 Some RF test points ..............................................................................................................................4–8
Figure 19 RF Controls window ........................................................................................................................... 4–10
Figure 20 Rx IQ test points ................................................................................................................................. 4–13
Figure 21 RSSI Reading window........................................................................................................................ 4–14
Figure 22 RF Controls window ........................................................................................................................... 4–16
Figure 23 Auto tuning concept with CMU200................................................................................................... 4–19
Figure 24 Rf channel filter calibration typical values ...................................................................................... 4–20
RM-164
RF Troubleshooting and Manual Tuning Guide
Issue 1 COMPANY CONFIDENTIAL Page 4 –3
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