User Guide

NSM–2
Service Software Instructions
PAMS Technical Documentation
Page 92
Issue 1 12/1999
 Nokia Mobile Phones Ltd.
4. Alignment of Transmitter Power Levels
Equipment:
Pulsed power meter or spectrum analyzer and 10 dB attenuator. Voltage
source set to 3.6 V.
The following settings for the spectrum analyzer are recommended when
aligning the power levels: zero span, resolution and video bandwidths 1
MHz, input attenuation 40 dB, sweep time 1 ms, video triggering.
NOTE! If spectrum analyzer is used in power level alignment the reading
needs to be calibrated with a power meter after every power up. Check
also the source voltage during TX burst with oscilloscope and use big
enough capacitor.
Procedure:
Targets in dBm:
Power level EGSM PCN
0 29
1 27.5
2 26
3 24
4 22
5 32 20
6 30.5 18
7 29 16
8 27 14
9 25 12
10 23 10
11 21 8
12 19 6.5
13 17 5
14 15 3.5
15 13 2.5
16 11.5
17 10
18 8.5
19 7
Base –20 –20
It is recommended that all the power levels are separately aligned al-
though there is a possibility to align only three and calculate the rest. This
is due to the fact that the calculation is not accurate enough.
NOTE! Base level must be adjusted manually because the calculation
most often fails.