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PAMS Technical Documentation
Transceiver RPE–1
Chapter 6
RPE–1 TUNING
INSTRUCTIONS
Original, 02/98
Copyright 1998 Nokia Mobile Phones. All rights reserved.
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RPE–1
PAMS
Tuning Instructions
Amendment
Number
Technical Documentation
AMENDMENT RECORD SHEET
Date Inserted By Comments
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RPE–1 TUNING INSTRUCTIONS
Contents
Introduction Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Page 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Required Equipment Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Setup Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Setup for Tuning Page 6. . . . . . . . . . . . . . . . . . . . . . . . .
Equipment Setup for SW Upgrading with Flash Security Box 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. . . . . . . . . . . . . . . .
Tuning Instructions
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RPE–1
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Tuning Instructions
Introduction
General
In contrast to earlier second–generation analog cellular phones almost all tuning operations of the RPE–1 are carried out using the service software. The
service software turns the phone into tuning 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 converters 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 advisable when there is need to retain that information, e.g. in view of replacement of the circuit. The program also enables writing the default parameters on
the EEPROM, in which case all tuning steps should be carried out.
Technical Documentation
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!
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Required Equipment
– PC/AT computer with service software; see separate section for instructions
on installation and use.
– M2BUS adapter DAU–9P 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
Tuning Instructions
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–connector) 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–9P, 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.
The RF cable should be connected between the RF connector of the test set
and the appropriate connector.
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Tuning Instructions
Equipment Setup for Tuning
Technical Documentation
Item: Service accessory: Product code:
1. Transceiver Card RPE–1
2. Service Adapter JBT–8 0770099
3. Fast Travel Charger ACH–6E 0675084
4. MBUS Cable DAU–9P 0730109
5. RF cable XRP–1 0730124
6. SW Security Device PKD–1 0750018
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Tuning Instructions
Equipment Setup for SW Upgrading with Flash Security Box
Item: Service accessory: Product code:
1. Transceiver Card RPE–1
2. Service Adapter JBT–8 0770099
3. Fast Travel Charger ACH–6E 0675084
4. Flash Security Box TDF–4 0770106
5. Service Cable SCH–5 0730098
6. Cable Assembly AXS–4 0730090
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Tuning Instructions
Starting The Software
The software is delivered on a diskette and is copy protected with a dongle.
The software must be installed on the hard disk, see installation instructions in
Service Software User’s Guide.
Starting steps:
– Start Windows
– Open NMP Service Software Group
– When Login windows appears press
– Choose from main menu
OK
button
Product –> New.
Technical Documentation
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Tuning Steps
1. RSSI Reference Signal Level Storage
Reference value for the received signal strength meter are program tuned.
RSSI reference signal level programming:
– Select
– Connect RF generator to antenna connector at 947.067710 MHz.
– Adjust signal generator level to –80 dBm + cable attenuation.
– Press
– Adjust signal generator level to –55 dBm + cable attenuation.
– Press
– Values should be below ±3.0 dB.
– Press
Tuning –> RSSI (AGC)...
OK
button
OK
button.
OK
button.
.
Tuning Instructions
2. AFC Diagram Storage
This tuning is used to calibrate the automatic frequency control range.
AFC tuning:
– Select
– Set RF generator frequency 947.067710 MHz at level –55 dBm + RF cable
attenuation.
– Check that ”Cont. mode channel” is 60
– The measurement result should be;
– Press
Tuning –> AFC...
• Low > –20 kHz
• Middle ±3.0 kHz (depends on generator frequency accuracy)
• High < 20 kHz
OK
button.
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Tuning Instructions
Technical Documentation
3. I/Q Modulator Amplitude Balance and Phase Shift Tuning
The purpose of this tuning operation is to adjust the I/Q modulator d.c. offsets
and the I/Q modulator amplitude balance and phase shift.
I/Q modulator d.c. offsets, amplitude balance and phase shift tuning:
– Select
– Select I/Q tuning values from PC’s memory, phone’s EEPROM or factory de-
fault values.
– Connect spectrum analyzer (with attenuator if needed) to phone antenna
connector.
– Check that TX power level is level 10, channel is 60 and TX data type is 1.
– Adjust spectrum analyzer centre frequency to 902 MHz, Span 200 kHz,
Res BW 10 kHz, Video BW 1 kHz and Sweep time 0.5 s.
Tuning –> TX I/Q...
–67.71 kHz +67.71 kHz
CHF
D.C. offset
tunings:
Set this value
to minimum
> 30 dB
> 35 dB
Amplitude &
phase difference:
Set this value
to minimum
– Select option ”TX I d.c. offset”.
– Adjust the level of centre frequency (CHF signal) to minimum by varying D/A
converter value with
<–
and –> buttons.
– The amplitude difference between CHF–67.7 kHz and CHF should be
>30 dB.
6 – 10
– Select option ”TX Q d.c. offset”.
– Adjust the level of signal CHF to minimum by varying D/A converter value
with <– and
–>
keys.
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– Select option ”Tune Amplitude Difference”.
– Adjust the level of signal CHF+67.7 kHz (902.06777 MHz) to minimum by
varying D/A converter value with <– and –> keys.
– The amplitude difference between CHF+67.7 kHz and CHF–67 kHz should
be >35 dB.
– Select option ”Tune Phase Difference”.
– Adjust the level of signal CHF+67.7 kHz to minimum by varying D/A convert-
er value with <– and –> keys.
– When values are correct press
OK
Tuning Instructions
button.
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Tuning Instructions
4. Tuning of Transmitter Power Levels
This adjustment loads the power levels of the phone transmitter into the EEPROM. When doing this, a pulse power meter or spectrum analyzer must be
used.
Power levels programming:
– Select
– Select I/Q tuning values from PC’s memory, phone’s EEPROM or factory de-
fault values.
– Connect pulse power meter or spectrum analyzer to antenna connector.
– Check that channel is 60.
– Adjust the power level (levels 7, 13 and 15) with + and – buttons and
change levels with ↑
Power
level
Tuning –> TX Power...
and ↓ keys.
Tuning P
(Ch 60)
OUT
/dBm
Technical Documentation
7 28.5 .... 29,0
13 17.5
15 14.2
– Press
– Once all TX levels are correct, press
Calculate
button to calculate all other levels.
OK
button.
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