Semi-Automatic Calibrations And Measurements - Step By Step: Rx/Tx And Gsm Bands; Rx Tunings - Nokia RH-37 Series Service Software And Tuning Instructions

Nokia Custome Care
Table 2: List of necessary tunings after replacement of RF key components and surrounding R/C/Ls
Z7800
Z7802
Z7801
N7500
G7501
G7500
N7700
Z7803
Z7700
Semi-automatic calibrations and measurements - step by step: RX/TX and
GSM bands

RX tunings

The RX calibration has to be performed to determine gains at different gain settings in
the RF ASIC. The calibration must be done in all three bands:
RX calibration requires an external RF signal generator. Most of the radio communication
testers like CMD 55 or CMU 200 can be used also as RF signal generators, generating
continuous RF signals (CW signal) with defined levels and frequencies.
Note: Depending on Firmware version, the CMU 200 can have problems generating a non-pulsed,
non-modulated CW signal.
RX calibration in the GSM900 band combines two alignments: AFC and AGC calibrations.
The calibration of GSM 1800 and GSM 1900 bands only determines the AGC values.
The AFC calibration detects an initial AFC value and an AFC slope coefficient. The AFC
calibration ensures the proper function of the initial synchronization (base station
search, before location update is done) when the phone has been set to Normal Mode.
Issue 1 07/04
Service Sofftware and Tuning Instructions
Tunings/ Calibrations
Antenna
Switch x
Module
SAW 1800 Rx
SAW 1900 Rx
RF ASIC
x
(Helgo 8.5)
VCTCXO
VCO
TX-PA x
SAW900 Rx
SAW900 Tx x
Nokia Corporation
x x
x x
x x
x x x x
x
x
x
x x
RH-37
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