Nokia Mobile Phones NSE-5 Series Service Manual page 139

PAMS
Technical Documentation
Tx Power... command
An antenna cable, a GSM/PCN signal tester or either a Pulse Power
Meter or a spectrum analyser along with a 10dB attenuator is needed for
the tuning. If the tuning is performed with external voltage source, it shall
be set to 3.6 V. Before starting the TX Power tuning the active band is set
to the GSM band. For GSM the alignment channel is 60 (902 MHz) and
for PCN 700 (1747.8 MHz). The side channels for GSM are 1 (890.2 MHz)
and 124 (914.8 MHz) and for PCN 512 (1710.2 MHz) and 885 (1784.8
MHz).
Note: In TX Power tuning the signal timing is irrelevant, and can not be measured since
the phone is set to local mode.
When using spectrum analyzer:
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.
Start tuning
Activation
Alt, T,P
Starts TX power tuning.
The following automatic selection are made when the tuning function is
activated:
Active unit
TX Power level
Operation mode
The TX power tuning is performed in the following 22 steps:
Select GSM band on the GSM/PCN signal tester or GSM/PCN
Power Meter. Select the GSM band in WinTesla in menu
Product, Band and GSM.
Compensate for antenna cable loss on the GSM/PCN signal
tester or GSM/PCN Power Meter. Typical values for a standard
cable is in GSM mode 0.6 – 0.7 dB cable loss.
Select measurement of average burst power on the GSM/PCN
signal tester or GSM/PCN Power Meter.
Select the menu Testing and RF Controls. And set:
- Active Unit
- TX Data Type
Issue 1 07/99
Status Bar Text
Initialising local mode....;
= TX
= 19 (The lowest power level)
= Burst
= TX
= Random
Service Software Instructions
Page 39
NSE–5