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Programmes After Market Services (P.A.M.S.) Technical Documentation NME2A SeriesTransceivers
Tuning Instructions
Original 08/97
NME2A Tuning Instructions
P.A.M.S. Technical Documentation
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NME2A Tuning Instructions
Contents Page No
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Equipment Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starting The Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starting options for PCLocals service software . . . . . . . . . . . . . . . . . . . . Tuning Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1. RSSI Reference Signal Level Storage . . . . . . . . . . . . . . . . . . . . . . . . . 2. AFC Diagram Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3. I/Q Modulator Amplitude Balance and Phase Shift Tuning . . . . . . . . 4. Tuning of Transmitter Power Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 6 9 9 10 10 10 11 13
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NME2A Tuning Instructions
P.A.M.S. Technical Documentation
List of Figures Page No
Figure 1. Figure 2. Figure 3. Equipment setup with Audio Test Box Tuning . . . . . . . . . . . . . Equipment setup without Audio Test Box Tuning . . . . . . . . . . Amplitude Balance /Phase Shift Graph . . . . . . . . . . . . . . . . . . . 7 8 11
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P.A.M.S. Technical Documentation
NME2A Tuning Instructions
General
Most of the tuning are done with help of the PCLocals software. The PCLocals program turns the phone into the Locals mode, in which the phone can be outwardly controlled via the M2BUS interface. Tuning is based on the PCLocals 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 PCLocals program 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. If a repair has been carried out on the RF section of a system module then the appropriate tunings should be performed as described in the following section and using the onscreen help menus as a guide. Spare system modules will be delivered pretuned from the factory and will not require retuning. 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!
N.B.
Required Equipment
PC/AT computer with PCLocals software; see different PCLocals Instructions for instructions on installation and use. M2BUS adapter DAU2 and other service accessories; see equipment setup pictures. Multimeter or DVM. Power supply 13.2 V and minimum 5 A current capability. GSM radio telephone test station or separate measuring equipment as follows: frequency counter (±1 ppm) RF generator pulse power meter spectrum analyzer attenuator and branching unit
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Equipment Setup
Caution: Make sure that you have switched off the PC and the printer before making connections! Caution: Do not connect the PKD1 key to the serial port. You may damage your PKD1!
Attach the protection key PKD1 to parallel port one (25pin female Dconnector) of the PC. When connecting the PKD1 to the parallel port be sure that you insert the PC end of the PKD1 to the PC (male side). If you use a printer on parallel port one, place the PKD1 between the PC and your printer cable. To set up equipment, connect the M2BUS adapter to the serial port (RS232) of the computer. In case you are using a 9pin serial port (normal with an AT set) use the mating adapter supplied with the M2BUS adapter. Attach one end of the DKH1 modular cable to the DAU2 PC/M2BUS adapter and the other end to the service box. Connect one end of another modular cable also to the service box and the other end to the phone's system cable. Then connect handset's spiral cable to the service box as well. For audio testing connect the coaxial cables as follows: Connect both coaxial BNC BNC cables to the connectors of service box marked as MIC and EAR. Attach EAR line of coaxial cable to AF INPUT of test equipment. Attach MIC line of coaxial cable to MOD GEN OUTPUT of test equipment. The RF cable should be connected between the RF connector of the phone and the RF connector of the test equipment. Last, connect the system cable to the phone as well as power supply and switch the power on to all equipments.
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NME2A Tuning Instructions
NME2A
Figure 1. Item: code:
Equipment setup with Audio Test Box Tuning Product
Service accessory:
2,4 3 5 6 7, 8 9 10
Modular cable, DKH1 Handset, HSE6XA Coaxial cable, mini UHF BNC System Cable, SCM1 Coaxial cable, BNC BNC Audio Test Box PC/M2BUS adapter, DAU2 RS232 adapter (9 pin to 25 pin) Software protection key PKD1 "dongle" Service Software diskette 3.5" Service Software diskette 5.25"
9780084 0640098 not supplied 0730066 not supplied TBA 0750006 4626170 0750018 0774028 0774031
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NME2A Tuning Instructions
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NME2A
Figure 2. Item: code: 1 3 5 6 10
Equipment setup without Audio Test Box Tuning Product
Service accessory:
Service cable, DKH5 Handset, HSE6XA Coaxial cable, mini UHF BNC System Cable, SCM1 PC/M2BUS adapter, DAU2 RS232 adapter (9 pin to 25 pin) Software protection key PKD1 "dongle" Service Software diskette 3.5" Service Software diskette 5.25"
0730038 0640098 not supplied 0730066 0750006 4626170 0750018 0774028 0774031
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NME2A Tuning Instructions
Starting The Program
The program is delivered on a diskette and is copy protected with a dongle. The program can also be installed on the hard disk, which is recommendable to obtain a maximum data access rate. In case you want to store the program to the hard disk, proceed according to instructions given in PCLocals installation manual. The program is started with the command: NME2SERV Enter (or PCLSTART Enter) The program can be set up work with different serial ports or display types.
Starting options for PCLocals service software
The program is started by entering the following command: NME2SERV For more information about how to operate the PCLocals software, refer to booklet PCLocals Software Instructions.
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NME2A Tuning Instructions
P.A.M.S. 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: Start the service software and go to "Main" menu. Select "Phone mode" and select local mode with Enter key. Select "Testing and Adjustments" menu and press Enter. Select "Adjustments" menu and press Enter. Connect RF generator to antenna connector at 947.06771 MHz. Adjust signal generator level to 57 dBm + cable attenuation. Select "RSSI Calibration" and press Enter. RSSI offset value should be within 37...49 dB. AGC calibration values (Compensation Term) should be below ±2.0dB. Press Esc key. Store the value to the EEPROM with Y key.
2. AFC Diagram Storage
This tuning is used to calibrate the automatic frequency control range. AFC tuning: Set RF generator frequency 947.06771 MHz at level 57 dBm. Select adjustments menu option "AFC Diagram" and press Enter Check that " Cont mode channel" is 60 The measurement result should be; · Low over 22 kHz (< 10 kHz) · Middle ±1.5 kHz (depends on generator frequency accuracy) · High below +22 kHz (> 10 kHz) Press Esc key and store with Y key.
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NME2A Tuning Instructions
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: Connect spectrum analyzer (with attenuator if needed) to phone antenna connector. Select adjustment menu option "TX I/Q Tuning" and press Enter. Press Y. Check that TX power level is level 10, 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
D.C. offset tunings: Set this value to minimum
CHF
+67.71 kHz
> 30 dB
> 35 dB
Amplitude & phase difference: Set this value to minimum
Figure 3. Amplitude Balance /Phase Shift Graph Select option "TX I d.c. offset" and press Enter. Adjust the level of centre frequency (CHF signal) to minimum by varying D/A converter value with + and keys. The amplitude difference between CHF67.7 kHz and CHF should be >30 dB. When value is OK press Esc. Select option "TX Q d.c. offset" and press Enter. Adjust the level of signal CHF to minimum by varying D/A converter value with + and keys.
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P.A.M.S. Technical Documentation
When value is OK press Esc. If the change when adjusting TX I was small, then repeat the Whole adjustment. Select option "TX I and Q d.c. offset" and press Enter. Adjust the level of signal CHF to minimum by varying D/A converter value with + and keys. When value is OK press Esc. Select option "Tune Amplitude Difference" and press Enter. Adjust the level of signal CHF+67.7 kHz (902.06771 MHz) to minimum by varying D/A converter value with + and keys. The amplitude difference between CHF+67.7 kHz and CHF67 kHz should be >35 dB. When value is OK press Esc. Select option "Tune Phase Difference" and press Enter. Adjust the level of signal CHF+67.7 kHz to minimum by varying D/A converter value with + and keys. When value is OK press Esc. If the change in "Tune amplitude difference" was small, then repeat the adjustment again from "Tune amplitude difference". Press Esc key and store new values with Y key.
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NME2A 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.
Note:
Before adjusting the power levels, you must be sure the test equipment have a measuring uncertainty less than ±1 dB at desired levels.
Power levels programming: Connect pulse power meter or spectrum analyzer to antenna connector. Check that continuous mode channel 60. Select adjustments menu option "TX Power Tuning" and press Enter. Press Y. Start at LowPowerlevel 15. Use F9 and F10 to tune the output with the DA step (don't tune it with the coefficient !) Secondly adjust power level 10 and finally level 2. To tune level 10 and 2, use the +/ keys. To change power levels, use up/down keys. Power level 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Tuning POUT/dBm (13.2 V, CH60) 39 tune! Pwr coef 37 35 33 31 29 27 25 23 tune! pwr coef 21 19 17 15 13 tune! D/A step
Press F3 to calculate all other levels. Once all TX levels are OK, press Esc and store readings in phone EEPROM with pressing Y.
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