PAMS Technical Documentation NSM–1 Series Transceivers Tuning Instructions Original 10/98
NSM–1 Tuning Instructions PAMS Technical Documentation CONTENTS Tuning Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Required Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Equipment Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Equipment Setup for Tuning a Phone without Removing Covers . . . .
PAMS NSM–1 Technical Documentation Tuning Instructions Tuning Instructions General All tuning operations of the NSM–1 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 MBUS 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.
PAMS NSM–1 Tuning Instructions Technical Documentation Required Equipment – PC with service software; see separate section for instructions on installation and use. – Service accessories; see equipment setup pictures. – Multimeter or DVM.
PAMS NSM–1 Tuning Instructions Technical Documentation Equipment Setup for Tuning a Phone without Removing Covers 4. 5. 1. 2. 3. Item: Service accessory: Product code: 1 Service Battery BBD–3 0775071 2 DC Cable SCB–3 0730114 3 Service MBUS Cable DAU–9P 0730109 4 Software protection key PKD–1 0750018 5 Service SW diskette 3.5” for WinTesla 0774046 6 Service SW diskette 3.
PAMS NSM–1 Tuning Instructions Technical Documentation Flash Concept for NSM–1 10. 13. 12. 11. 6. 9A. 4. 7. 9B. 8. 5. 1. 2. 3.
PAMS NSM–1 Tuning Instructions Technical Documentation Tuning With Covers Off – Using Test–frame JBS–19 8. 3. 4. 9. 6. 1. 7. 5. 2.
PAMS NSM–1 Tuning Instructions Technical Documentation Tuning With Covers Off – using Light Jig JBT–1 8. 3. 4. 9. 7. 1. 6. 5. 2.
PAMS NSM–1 Tuning Instructions Technical Documentation Warranty Transfer 1.
PAMS NSM–1 Tuning Instructions Technical Documentation Tuning Steps 1. RX Calibration (AGC + AFC) Procedure Follow the steps described in chapter ”Service Software Instructions” section ”RX calibration... command”.
PAMS NSM–1 Technical Documentation Tuning Instructions wanted frequency. This is most easiest done by measuring the UHF VCO (G550) frequency because the absolute value of the deviation is biggest there. In the GSM mid channel the UHF–VCO frequency should be 2040.0 MHz. If the deviation is bigger than about +/–20 kHz it is probable that the VCTCXO is not operating correctly.
PAMS NSM–1 Tuning Instructions Technical Documentation 2. Alignment of Transmitter Power Levels Equipment: Pulsed power meter or spectrum analyzer and 10 dB attenuator. Voltage source set to 3.6 V. The following settings for the spectrum analyzer are recommended when aligning the power levels: zero span, resolution and video bandwidths 1 MHz, input attenuation 40 dB, sweep time 1 ms, video triggering.
PAMS NSM–1 Technical Documentation Tuning Instructions It is recommended that all the power levels are separately aligned although there is a possibility to align only three and calculate the rest. This is due to the fact that the calculation is not accurate enough, especially for PCN lowest power levels where the targets are NSM–1 specific. NOTE! Base level must be adjusted manually because the calculation most often fails.
PAMS NSM–1 Tuning Instructions Technical Documentation 3. I/Q Modulator Alignments I/Q modulator alignments are performed in PCN band. If GSM band has been selected and I/Q alignment is started, the service software asks to change to PCN band. If the user wants to continue in GSM, the adjusted values can only be saved to PC memory, not to phone’s EEPROM. After changing to PCN band values from PC memory are available, and if the modulator adjustment is good, also the values can be saved to phone’s EEPROM.
PAMS NSM–1 Tuning Instructions Technical Documentation – Check the levels of CHF and CHF + 67.71 kHz. Both the levels should be at least 30 dB down to the wanted sideband CHF - 67.71 kHz. If both or either of the specifications is not met adjust the the required values (I and Q DC offsets for CHF and amplitude and phase for CHF + 67.71kHz) to meet the specifications. –67.71 kHz CHF D.C. offset tunings: Set this value to minimum +67.
PAMS NSM–1 Tuning Instructions Technical Documentation 4. Energy Management Calibration See chapter ”Service Software Instructions” and section ”Tuning – Energy Management Calibration... command” for further information.
