Nokia NSB-7 Series Service Manual page 212

NSB-7
Service Software Instructions
• Write down the TX power value of spectrum analyzer.
• Coupler attenuation value = TX value of Golden phone - TX power value of spec-
trum analyzer
2. RX and TX Tuning with RA5
Calibration of the coupler has to be made before tuning. In tuning has to be used atten-
uation values got from calibration.
Tuning procedure step by step:
1 Insert coupler module RA5 to its place properly.
2 Connect cables for JBU-6 box and measuring devices carefully. Check that DC
SUPPLY MODE has been switched to FLA-5 in JBU-6.
3 Insert phone in the JBU-6 box.
4 Adjust DC power supply to 9V. Switch power on.
5 Close the cover of the JBU-6 box and start WinTesla.
In the case of RX tuning:
• Choose from Menu bar "Tuning" and then "RX calibration"
• Set RF generator to frequency 1960.067710 MHz and high level -55.0 dBm +
cable attenuation + coupler attenuation (if cable attenuation is 0.5 dB and cou-
pler attenuation e.g. 4.5 dB then level is –50 dBm). Press OK.
• Set RF generator to frequency 1960.067710 MHz and low level -85.0 dBm +
cable attenuation + coupler attenuation (if cable attenuation is 0.5 dB and cou-
pler attenuation e.g. 4.5 dB then level is –80 dBm). Press OK.
• In next window press "save".
In the case of TX tuning:
• Choose from Menu bar "Tuning" and then "TX power"
• When "start tuning" window opens select "1 EEPROM values". Press OK.
• Set Spectrum analyzer's settings as follows:
Page 106
REF level offset (e.g. attenuator 10 dB + cable 0.5 dB) 10.5 dB
Set marker to point to a peak value
ãNokia Mobile Phones Ltd.
PAMS Technical Documentation
Issue 1 06/00