Tx I/Q Tuning - Nokia NEM-4 Series Troubleshooting Instructions

NEM-4
RF Troubleshooting
GSM1900(PCS)
Change the center frequency of the spectrum analyzer as instructed in the Spectrum
Analyzer Settings window and press OK.
From the main toolbar, select TX Data Type Random and TX PA Mode High.
Tune the power levels according to the table below by adjusting coefficient values. The
levels below differ to some extent from the target values in Phoenix, since they are prod-
uct specific.
PL 0 1 2
dBm 30 28 26
Press Save and Continue to finish TX Power Level Tuning.

TX I/Q Tuning

This tuning must be done in all three bands.
Caution: In case you use a spectrum analyser make sure that the external attenuation (20 -
30dB) between phone and spectrum analyser is high enough that the input of the analy-
ser can't be destroyed. Adjust the reference level offset according to the insertion loss
from the phone to the spectrum analyser.
Connect a Spectrum Analyzer or GSM tester with the option *Narrow Spectrum' to the
RF connector of the phone.
Select
Wait until the TX IQ Tuning window pops up. Press Start.
Page 6(b)-116
Company Confidential
Table 3:
3 4 5 6 7
24 22 20 18 16
Tuning [Alt-U]
Copyright  2003 Nokia Corporation.
Company Confidential
CCS Technical Documentation
8 9 10 11 12
14 12 10 8.2 6.4
TX IQ Tuning [I]
13 14 15 Base
4.6 2.8 1 -28
Issue 1 09/2003