TUNIN, ---SCHEMATY---GSM
[ Pobierz całość w formacie PDF ]Programs After Market Services (PAMS)
Technical Documentation
NHE–6 TUNING
INSTRUCTIONS
Original 09/97
NHE–6
PAMS
Tuning Instructions
Technical Documentation
AMENDMENT RECORD SHEET
Amendment
Number
Date
Inserted By Comments
Issue 2
09/97
J Rantala
p.5 PC spex
Issue 2
09/97
J Rantala
p.12 Power levels
Page 2
Original 09/97
PAMS
NHE–6
Technical Documentation
Tuning Instructions
TUNING INSTRUCTIONS
Contents
Introduction
Page 4
General
Page 4
Required Equipment
Page 5
Equipment Setup
Page 5
Equipment Setup for Tuning a Phone without Removing Covers
Page 6
Equipment Setup for Tuning a Phone with Removing Covers
Page 7
Starting The Software
Page 8
Tuning Steps
Page 9
1. RSSI Reference Signal Level Storage
Page 9
2. AFC Diagram Storage
Page 9
3. I/Q Modulator Amplitude Balance and Phase Shift Tuning
Page 10
4. Tuning of Transmitter Power Levels
Page 12
5. Charge Voltage Adjustment
Page 13
6. Battery Voltage Adjustment
Page 13
7. LCD Calibration
Page 13
Original 09/97
Page 3
NHE–6
PAMS
Tuning Instructions
Technical Documentation
Introduction
General
Almost all tuning operations of the NHE–6 are carried out using the service
software. The service software turns the phone into the locals mode, in which
the phone can be outwardly controlled via the M2BUS interface.
Tuning is based on the software communicating with the D/A and A/D convert-
ers of the phone. In some instances the phone processor will also calculate the
required correction parameter.
The tuning values of the phone reside on the EEPROM. The contents of the
EEPROM can be read by the service software and saved as a file. This is ad-
visable when there is need to retain that information, e.g. in view of replace-
ment of the circuit. The program also enables writing the default parameters on
the EEPROM, in which case all tuning steps should be carried out.
N.B.
During tuning, proceed as follows:
– Take care not to damage sensitive measuring instruments with excessive
RF power.
– Carry out all tuning steps in the shortest possible time to avoid excessive
heating of RF units.
– Perform all tuning steps in the order presented.
– Never try to mask a fault by tuning it out!
Page 4
Original 09/97
PAMS
NHE–6
Technical Documentation
Tuning Instructions
Required Equipment
– PC/AT computer with service software; see separate section for instructions
on installation and use.
– M2BUS adapter DAU–4S and other service accessories; see equipment set-
up pictures.
– Multimeter or DVM.
– GSM radio telephone test station or separate measuring equipment as fol-
lows:
– RF generator
– pulse power meter
– spectrum analyzer
– attenuator and branching unit
Equipment Setup
Caution: Make sure that you have switched off the PC and the printer before
making connections !
Caution: Do not connect the PKD–1 key to the serial port. You may damage
your PKD–1 !
Attach the protection key PKD–1 to parallel port one (25–pin female D–connec-
tor) of the PC. When connecting the PKD–1 to the parallel port be sure that you
insert the PC end of the PKD–1 to the PC (male side). If you use a printer on
parallel port one, place the PKD–1 between the PC and your printer cable.
Next connect the M2BUS service cable, DAU–4S, to the serial port (RS–232) of
the computer. Attach one end of the service cable to the PC serial port and the
other end to the service box, JBU–4. For servicing the phone with the covers in
place the service box should always be used.
The RF cable should be connected between the RF connector of the test set
and the appropriate connector on JBU–4. When the phone covers are removed
the RF connection on the extension cable should be used instead.
For audio measurements connect the service cable, SCS–4, as follows:
– EAR line to AF INPUT of test equipment
– MIC line to MOD GEN OUTPUT of test equipment
Original 09/97
Page 5
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