After Sales Technical Documentation
NHN–3N
TUNING INSTRUCTIONS
Original, 42/96
NMP Part No. 0275257
Tuning Instructions
After Sales
NHN–3N
Technical Documentation
AMENDMENT RECORD SHEET
Amendment
Number
Date Inserted By Comments
Page 2
Original, 42/96
After Sales
Tuning Instructions
Technical Documentation
NHN–3N
TUNING INSTRUCTIONS
Contents
NO TAG Introduction NO TAG
NO TAG General NO TAG
Required Equipment Page 5
Equipment Setup Page 6
Equipment Setup For Tuning A Phone Without Removing Covers Page 7
Equipment Setup For Tuning A Phone With Removing Covers Page 8
Starting the Program Page 9
Manual Tuning Steps Page 9
General Page 9
Programmed Tuning Commands Page 10
1– AFC Tuning Page 10
2 – AFC Limits Tuning Page 10
3 – RSSI and AGC Tuning Page 11
4 – Deviation Tuning Page 11
5 – TX Output Power High Tuning Page 13
6 – TX Output Power Low Tuning Page 13
7 – Battery Voltage Tuning Page 13
8 – Charger Voltage Tuning Page 13
9 – Tuning Values & Defaults Page 14
Original, 42/96
Page 3
Tuning Instructions
After Sales
NHN–3N
Technical Documentation
Introduction
General
In contrast to earlier, second–generation phones, almost all tuning of the
NHN–3N phone can be carried out with the PCLocals software. This program
turns the phone into the Locals mode, enabling control of the phone over the
external M2BUS interface.
Tuning of the NHN–3N is based on the PCLocals software communicating with
the D/A and A/D converters of the phone. In a few instances, the phone also
figures out the required correction parameter. The tuning values of the phone
reside in the EEPROM.
The program recognizes the country version of the phone and shows correct
frequencies and channels that should be used when tuning the phone. Frequencies are shown in follows:
Low Middle High
TX Ch 1 / 890.0125 Ch 500 / 902.4875 Ch 1000 / 914.9875
RX Ch 1 / 935.0125 Ch 500 / 947.4875 Ch 1000 / 959.9875
Note, that when you are doing tuning steps at the first time, the program will
search a default frequency file, a default channels file and a default power levels file. If there is none, these files are created automatically.
Note: Tunings have to be done by using an accurate 4.8 V supply. The
reference values for battery and charge voltage are set by using a 4.8 V
supply.
CAUTION
During tuning, proceed as follows:
– Take care not to damage sensitive measuring instruments by using too
much RF power.
– Carry out all tuning steps as quickly as possible to avoid excessive heat
buildup on the RF unit.
– Carry out the tuning steps in the order given.
– Never attempt to tune out a defect!
– Consider the info texts.
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Original, 42/96
After Sales
Tuning Instructions
Technical Documentation
Required Equipment
– PC/AT computer with PCLocals software; see Sect. 5 for instructions on
installation and use.
– M2BUS adapter SCN–3 and other service accessories; see equipment set-
up pictures.
– RF–Adapter AAT–2N.
– Multimeter or DVM.
– Power supply
– DUPLEX radio telephone test station or separate measuring equipment as
follows:
– frequency counter (± 0.8 ppm)
– RF generator
– modulation analyzer
– attenuator
NHN–3N
– AF generator
– power meter
– branching unit
– SINAD meter
Original, 42/96
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Tuning Instructions
After Sales
NHN–3N
Technical Documentation
Equipment Setup
Turn off the computer before connecting to avoid possible damage to the serial
port.
Connect the M2BUS adapter SCN–3 ( item 1) to the phone. Connect 9–pin
male D–connector in your PC serial port.
Then connect SCN–3 audio lines to the measurement station by using the audio cables.
For transmit and audio measuring and adjustment connect SCN–3 EAR/MIC
breakout cables as follows:
– EAR line to test equipment (Marconi 2960) AF INPUT
– MIC line to test equipment (Marconi 2955) AF GEN OUTPUT
Connect SCN–3 power connectors to the supply voltage. Power supply must
be set to 5.0 V, when the phone is tuned.
Note: The supply voltage must be set to 4.8 V, when battery and charger refer-
ences are tuned.
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After Sales
Tuning Instructions
Technical Documentation
Equipment Setup For Tuning A Phone Without Removing Covers
+4.8 V
NHN–3N
Item: Service accessory: Product code:
1 Service Cable SCN–3 0770088
2 Audio Cable ADS–1 0730011
3 Modular T–Connector 4626134
4 Modular Cable XCM–1 4626131
5 Modular Power Connector 0770036
6 RS–232 Adapter (9 pin to 25 pin) 4626170
7 PC/MBUS Adapter DAU–2T 0750006
8 PCLocals diskette 3.5” 0774020
9 Software protection key PKD–1 ”dongle ” 0750018
10 RF Adapter AAT–2N 0770089
Original, 42/96
PCLocals diskette 5.25” 0774021
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Tuning Instructions
After Sales
NHN–3N
Technical Documentation
Equipment Setup For Tuning A Phone With Covers Removed
+4.8 V
Item: Service accessory: Product code:
1 Test frame, JBS–3N 0770090
2 Audio Cable ADS–1 0730011
3 Modular T–Connector 4626134
4 Modular Cable XCM–1 4626131
5 Modular Power Connector 0770036
6 RS–232 Adapter (9 pin to 25 pin) 4626170
7 PC/MBUS Adapter DAU–2T 0750006
8 PCLocals diskette 3.5” 0774020
PCLocals diskette 5.25” 0774021
9 Software protection key PKD–1 ”dongle” 0750018
10 Service Cable SCN–3 0770088
11 RF Adapter AAT–2N 0770089
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Original, 42/96
After Sales
Tuning Instructions
Technical Documentation
Starting the Program
The PCLocals service software is delivered on a diskette and is copy protected
with a dongle PKD–1. It must be present in parallel port when using the software. The PCLocals software can be started directly from the diskette. In case
you want to store the program to the hard disk, proceed according to instructions given in Sect. 5.
The software is started with the command NHN3NSER <Enter>
Manual Tuning Steps
General
If any part of the RF section of the radio module has been interfered, with few
manual tuning operations must be carried out before software tuning. If no repairs or replacements have been made, no manual tuning is necessary on the
phone or on a spare module as these have been tuned at the factory.
If you want to change ordinary tuning channels, proceed as follows:
NHN–3N
1. Choose EDIT from the file menu
2. Change channel values
3. Choose SAVE from the file menu
The program saves the channel settings as ”default.set” and uses them every
time when tuning or testing menu is chosen. If ”default.set” is not determined
the program uses ordinary channels depending on the phone‘s country version.
On the other hand, if the ”default.set” is determined then the program uses
those default channels and pays no attention to the phone‘s country version! If
you have problems with channels, then create the ”default.set” file. If you want
to stop using default.set file so delete it from the hard disk.
Where default channels are used:
Channel low for 1 band phones Afc and afc–limits tuning, basic settings
Channel mid for 1 band phones Afc and afc–limits tuning, basic settings
Channel high for 1 band phones Afc and afc–limits tuning, basic settings
Rssi channel low band 1 Rssi ch compensation
Rssi channel mid band 1 Rssi ch compensation,
Rssi levels and agc (1 band phones)
Rssi channel high band 1 Rssi ch compensation
Original, 42/96
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Tuning Instructions
After Sales
NHN–3N
Technical Documentation
Programmed Tuning Commands
1– AFC Tuning
This command is used to adjust the automatic frequency control.
The command turns the phone to the default middle channel (RX and TX) and
activates the transmitter.
To adjust, enter a number of values (000–255) to D/A converter and compare
results with frequency readings.
Note: Temperature during tuning should be approx. +25 °C.
AFC programming:
– Select ”Service” menu option: Tunings, AFC frequency tuning
– The program shows the AFC D/A converter reading.
– Proceed tuning until the value is within the middle TX frequency ± 0.3 kHz.
– Use arrow and page up/down –keys or mouse to change the value and enter
key to confirm a value. The same control keys are used in TX power level and
deviation tuning.
2 – AFC Limits Tuning
The program asks to set the right RF–generator frequencies and signal levels.
It calculates the upper and lower limit values and IF counter value.
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After Sales
Tuning Instructions
Technical Documentation
3 – RSSI and AGC Tuning
Reference values for the received signal strength measurement are tuned also
with PCLocals. Adjustment is carried out with the help of an external signal
generator.
RSSI programming:
– Select step: RSSI and AGC Tuning
– Program reads value given by A/D converter for received signal
– Program goes through three tuning points for channel compensation
– Program goes through all five tuning points shown in the table below, then
returns to main menu.
Tuning RF signal Level no
point level
1 –58 dBm 5
2 –68 dBm 4
3 –93 dBm 3
4 –103 dBm 2
5 –115 dBm 1
NHN–3N
AGC programming:
– The program asks to set the RF signal levels
– The program shows the AGC ON level and the AGC OFF level
4 – Deviation Tuning
FFSK Deviation Tuning
This adjustment is used to set outgoing FFSK data deviation.
The command turns the phone to default center channel (RX and TX), activates
the transmitter, opens the data path and sets up the modem to send a continuous 1800 Hz, ”0” signal.
To adjust, give some values (0–15) for D/A converter and compare results to
the reading given by the deviation meter.
FFSK signal deviation adjustment:
– Connect deviation meter to antenna connector.
– Select ”Service” menu option: Tunings, deviation tuning
Original, 42/96
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Tuning Instructions
After Sales
NHN–3N
Technical Documentation
Nominal Deviation Tuning
The purpose of this tuning operation is to adjust the nominal deviation of voice
and DTMF signaling.
The command turns the phone to the default center channel and activates the
transmitter.
To adjust, enter values from the range 0–7 into the D/A converter and compare
results with deviation meter readings.
Programming:
– Select ”Service” menu, option: Tunings, deviation tuning
Maximum Deviation Tuning
This adjustment has effect on voice and DTMF signal maximum deviation.
The command turns the phone on the default center channel and activates the
transmitter.
Enter various values from the range 0–7 into the D/A converter and compare
results with the reading in the deviation meter.
Note: Deviation will increase when D/A reading is decreased.
Programming:
– Select ”Service” menu, option: Tunings, deviation tuning
Phi Signal Deviation Tuning
The purpose of this adjustment is to adjust Phi signal deviation.
The command turns the phone on the default center channel (RX and TX), acti-
vates transmitter and enable the φ loop.
To adjust, enter few values (0–15) to the D/A converter and
compare changes to deviation meter readings.
Deviation adjustment:
– Select ”Service” menu option: Tunings, deviation tuning
– Check signal level at XEAR line; should be 100 ±20 mV
RMS
.
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Original, 42/96
After Sales
Tuning Instructions
Technical Documentation
5 – TX Output Power High Tuning
This adjustment programs the power levels of the phone transmitter into the
EEPROM. When doing this, a power meter must be used.
The command sets the phone on the default channels and activates the phone
transmitter.
Start by giving few values (000–255) for D/A converter readings and compare
changes to reading shown on the power meter. Programming can be interrupted when necessary by pressing Esc key.
Power levels programming:
– Connect power meter with RF–Adapter to phone’s antenna connector.
– Adjust the voltage to +5.0 V !
– Select ”Service” menu option: TX output power NHN3N
6 – TX Output Power Low Tuning
NHN–3N
Tuning is done in the same TX output power NHN3N tuning option
7 – Battery Voltage Tuning
A reference value for battery voltage is set by using an accurate 4.8 V supply.
Programming:
– In case the phone covers are not removed replace the standard battery of
the phone with the service cable from the test frame.
– Select ”Service” menu, option: Battery voltage tuning
– The program reads the 4.8 V, A/D reading fed to VBAT line.
8 – Charger Voltage Tuning
The reference value for the charge voltage is adjusted by using an accurate
4.8 V power supply.
Programming:
– In case the phone covers are not removed replace the standard battery of the
phone with the service cable from the test frame.
– Apply 4.8 V to VCHARG line. (Use PCC–1B cable)
– Select ”Service” menu, option: Charger voltage tuning
– Program reads 4.8 V, A/D reading fed to phone VC line.
Original, 42/96
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Tuning Instructions
After Sales
NHN–3N
Technical Documentation
9 – Tuning Values & Defaults
This command enables reading of the phone tuning parameters and writing the
defaults.
The command can be selected from the ”Service” menu, option: Tuning values
& defaults
Note: Spare modules received from the factory are factory–tuned.
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Technical Documentation
NHN–3N
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