After Sales Technical Documentation
NHE–5 TUNING
INSTRUCTIONS
Original, 46/95
NMP PArt No. 0275077
NHE–5 Tuning Instructions
AMENDMENT RECORD SHEET
After Sales
Technical Documentation
Amendment
Number
Date Inserted By Comments
Page 2
Original, 46/95
After Sales
Technical Documentation
TUNING INSTRUCTIONS
Contents
Introduction Page 4
General Page 4
Required Equipment Page 5
Equipment Setup Page 5
Equipment Setup For Tuning A Phone Without Remowing Covers Page 6
Equipment Setup For Tuning A Phone With Remowing 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
NHE–5 Tuning Instructions
Original, 46/95
Page 3
NHE–5 Tuning Instructions
Introduction
General
In contrast to earlier second–generation analog cellular phones almost all tuning operations of the NHE–5 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 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.
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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, 46/95
After Sales
Technical Documentation
Required Equipment
– PC/AT computer with service software; see Sect. 5 for intructions on installa-
tion 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
NHE–5 Tuning Instructions
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–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–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, 46/95
Page 5
NHE–5 Tuning Instructions
After Sales
Technical Documentation
Equipment Setup For Tuning A Phone Without Remowing Covers
6.
2.
7.
1.
4.
5.
3.
Item: Service accessory: Product code:
1. Service box, JBU–4 0770041
2. M2BUS adapter cable, DAU–4S 0730057
3. Service cable, SCS–4 0730052
4. Audio cable, ADS–1 0730011
5. Service battery, BBS–1 ?
6. Power connector, PCS–1 0730012
7. Service software diskette 3.5”, 0774034
– Service software diskette 5.1/4” 0774035
– Software protection key PKD–1 ”dongle” 0750018
– Antenna adapter, AAT–2 *) 0310016
S0001158
Page 6
*) Note: Be very careful when you install the antenna adapter AAT–2.
The antenna clip in the phone can be damaged very easily
Original, 46/95
After Sales
Technical Documentation
NHE–5 Tuning Instructions
Equipment Setup For Tuning A Phone With Remowing Covers
6.
2.
1.
4.
3. 5.
Item: Service accessory: Product code:
1. Service box, JBU–4 0770041
2. M2BUS adapter cable, DAU–4S 0730057
3. Module jig, JBS–14 0770049
4. Audio cable, ADS–1 0730011
5. Dummy battery, BBS–1 ?
6. Power connector, PCS–1 0730012
7. Service software diskette 3.5”, 0774034
– Service software diskette 5.1/4” 0774035
– Software protection key PKD–1 ”dongle” 0750018
7.
S0001156
Original, 46/95
Page 7
NHE–5 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
– Start software by double–clicking NHE–5 Service PCLocals icon
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– When Login windows appears press
– Choose from main menu
Product –> New.
OK
button
Page 8
Original, 46/95
After Sales
Technical Documentation
Tuning Steps
1. RSSI Reference Signal Level Storage
Reference value for the received signal strength meter are program tuned.
RSSI reference signal level programming:
NHE–5 Tuning Instructions
– 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.
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.
Tuning –> AFC...
.
– Check that ”Cont. mode channel” is 60
– The measurement result should be;
• Low over < –20 kHz
• Middle ±3.0 kHz (depends on generator frequency accuracy)
• High below > 20 kHz
– Press
OK
button.
Original, 46/95
Page 9
NHE–5 Tuning Instructions
Technical Documentation
3. I/Q Modulator Amplitude Balance and Phase Shift Tuning
The purpose of this tunig 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:
After Sales
– Select
Tuning –> TX I/Q...
– 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 15, Cont. mode 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.
–67.71 kHz +67.71 kHz
D.C. offset
tunings:
Set this value
to minimum
CHF
> 30 dB
> 35 dB
Amplitude &
phase difference:
Set this value
to minimum
Page 10
– 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.
– Select option ”TX Q d.c. offset”.
– Adjust the level of signal CHF to minimum by varying D/A converter value
<–
and
–>
with
keys.
Original, 46/95
After Sales
Technical Documentation
– 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 button.
NHE–5 Tuning Instructions
Original, 46/95
Page 11
NHE–5 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:
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Technical Documentation
– Select
– Select I/Q tuning values from PC’s memory, phone’s EEPROM or factory de-
fault values.
– Set power supply voltage to 6.0 V.
– Connect pulse power meter or spectrum analyzer to antenna connector.
– Check that continuous mode channel 60.
– Adjust the power level (levels 5, 13 and 15) with + and – buttons and
change levels with ↑
Power
level
5 33
13 17
15 13
– Press
– Once all TX levels are correct, press
Tuning –> TX Power...
and ↓ keys.
Tuning P
(VB=6.0 V, CH60)
Calculate
button to calculate all other levels.
OUT
/dBm
OK
button.
Page 12
Original, 46/95
After Sales
Technical Documentation
5. Charge Voltage Adjustment
A reference value for charge voltage is set by using an accurate 6.0 V supply.
Calibration of the charge voltage:
NHE–5 Tuning Instructions
– Select
– In case the phone covers are not removed replace the standard battery of
the phone with the service battery BBS–1.
– Apply +6 V to VCHARG line.
– Software reads 6 V, A/D reading fed to phone VCHARG line.
– Store charge voltage value to phone EEPROM by pressing
Tuning –> Charger A/D...
6. Battery Voltage Adjustment
A reference value for battery are calibrated by using an accurate 6 V supply.
Calibration of the A/D converter channels:
– Select
– In case the phone covers are not removed replace the standard battery of
the phone with the dummy battery BBS–1.
– Apply +6 V to service battery.
– Software reads 6 V, A/D reading fed to phone VBAT line.
– Store correct value to phone EEPROM by pressing
Tuning –> Battery A/D...
OK
OK
button.
button.
Original, 46/95
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NHE–5 Tuning Instructions
After Sales
Technical Documentation
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Original, 46/95
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