Agilent Technologies 8922 P manual Calibrating the overall system, Step

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Setting up the HP/Agilent 8922 GSM HSCSD Test System

Calibrating the overall system

Calibrating the overall system

Step 1.

Step 2.

Step 3.

NOTE

NOTE

There is an RF loss through the system from the slave unit's reported output level to that observed by the mobile due to cable loss and a nominal 7 dB loss through the system. Therefore once you have connected the HP/Agilent 8922 GSM HSCSD Test System and calibrated each unit individually (see the HP/Agilent 8922 Multi-Band Test System Supplementary User’s Guide), you must calibrate the overall system to account for these losses. To do this you need to adjust the RF Level Offset field on the Config screen. To determine the necessary RF Level Offset adjustments:

Connect a mobile to the HP/Agilent 8922 master unit and set up a call as described in Chapter 3 , “Manual operation,” on page 15.

Go to HSCSD Control screen on both units and set each unit to measure the master uplink slot.

Go the Config screen on both units and set the RF Lev Offset so that the transmitted power level of the master and slave units are the same.

When the transmitted power level is the same on both the master and slave units the system is calibrated to account for its RF losses.

RF losses may be different for GSM and DCS radio modes, therefore it is recommended that you perform calibration for both GSM and DCS.

You must calibrate the system whenever any of the following occur:

The HP/Agilent 8922 GSM HSCSD Test System is first set up.

Any hardware component in the system is changed (HP/ Agilent 83220 and/or HP/Agilent 8922).

Different IF Link or Aux RF In/Out cables are used.

After a RAM Initialize or Firmware Upgrade.

You need to troubleshoot the system or localize faults.

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Chapter 2

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Contents HP/Agilent 8922 GSM Hscsd Test System Option #K09 Warranty Limitation of Remedies and Liability Assistance Statement of Compliance Sound Emission Manufacturer’s DeclarationInstrument dangerous. Intentional interruption is Earthing ground, incorporated in the power cord. The mainsProhibited Safety Symbols Safety SymbolsISM 1-A Overview User’s Guide AbbreviationsContents Remote operation Returning equipment for repair Upgrading the HOP Controller ROM and Firmware Understanding the HP/Agilent Getting an overview of the HP/Agilent GSM Hscsd Test System HP/Agilent 8922 GSM Hscsd Test System, option #K09Chapter Features Setting up the HP/Agilent Before you start Checking the HP/Agilent 8922 Requirements for Hscsd Making the front panel connections Front panel connectionsMaking the rear panel connections StepRear panel connections Enabling the Hscsd functionality Inserting the keycard into the HP/AgilentTests screen Config screen Calibrating the overall system Manual operation Configuring the system Message Frame reset sent appears in the top left-hand corner Establishing a call Choosing which timeslot to measure Making measurementsMeasuring BER Changing power levels, timeslot and channels Hscsd control screenEnding a call Ending a call Screens Config screen Instrument typeChapter Slave address Hscsd screen Master downlink amplitudeSlave offset Master channelSelect ‘Master’ to measure before signalling mobile Master timeslot Slave timeslotCall Type Data rate MeasureMaster Tx level Master input level Master mode Slave Tx levelSlave input level Slave control Mobile reports Peak power displayTo Screen menu Fast BER Screen Fast BER screenLoopback Remote operation Introduction CONFigureINSTrumentTYPE Configure Subsystem Gpib CommandsConfigure Instrument Type comand syntax Display Screen command syntax Display Subsystem Gpib CommandsDISPlaySCReen Hscsd Hscsd Subsystem Gpib Commands Hscsd command syntax master unit Hscsd command syntax slave unit SYNC? TCHHSCSdMASTerTCHARFCn HSCSdMASTerSTATusTCHTSLot Command 0ptions HSCSdMASTerDOWNlinkAMPLitudeHSCSdMASTerTCHTLEVel HSCSdMASTerUPLinkAMPLitude HSCSdMASTerUPLinkAMPLitudeCONTrol HSCSDMASTerCALLTYPE HSCSDMASTerCALLRATE HSCSdSLAVeSTATusSYNC HSCSdSLAVeSTATusTCHTSLot? HSCSdSLAVeDOWNlinkAMPLitudeOFFSet HSCSdSLAVeTCHTLEVel HSCSdSLAVeUPLinkAMPLitude HSCSdSLAVeUPLinkAMPLitudeCONTrol Remote operating procedures Configuring the systemEstablishing a call Making measurementsChanging channels, timeslot and power levels Ending a call Example code showing a dual-band handover from E-GSM to DCS Clear ScreenPause Example code showing a dual-band handover from E-GSM to DCS Returning equipment for repair Return Procedure Chapter Sales and Service Offices Canada Sales and Service Offices Upgrading the HOP Controller ROM and Firmware Upgrading the Hop Controller ROM ROMSide View Figure A-3 Removing the A33 Hop Controller Board Figure A-4 Removing the A33 U62 HOP Controller ROMUpgrading the Hop Controller ROM Upgrading the firmware