Powerwave Technologies 5JS0059 1900MHz CDMA Multi-Channel Amplifier User Manual I GENERAL DESCRIPTION

Powerwave Technologies Inc 1900MHz CDMA Multi-Channel Amplifier I GENERAL DESCRIPTION

User Manual

044-xxxxx Rev. xINSTALLATION & SERVICEMANUALMULTICHANNELPOWER AMPLIFIERNTGY81AC1930-1990 MHz50 WATTS AVERAGE POWER04 April 2002Powerwave Technologies, Inc. Tel: (714) 466-10001801 E. St. Andrew Place Fax: (714) 466-5800Santa Ana, CA 92705 Web Site: www.powerwave.com®
044-xxxxx Rev. x iiTABLE OF CONTENTSPar. Section 1 PageNo. General Description No.1-1 Introduction..................................................................................................................... 1-11-2 General Description....................................................................................................... 1-11-3 Functional and Physical Specifications........................................................................... 1-1Section 2Installation2-1 Introduction..................................................................................................................... 2-12-2 Electrical Service Recommendations............................................................................. 2-12-3 Unpacking and Inspection .............................................................................................. 2-12-4 Installation Instructions ................................................................................................... 2-22-5 +26 VDC Power and Ground Connector P1................................................................... 2-22-6 Alarms and Sensing Connector P2 ................................................................................ 2-32-7 Differential IIC Clock, Receive, and Transmit Connector P3.......................................... 2-42-8 IIC, Power, Alarms,and Controls Connector P4 ............................................................. 2-42-9 IIC, RS485, Power, and Other Signals Connector P5.................................................... 2-6Section 3Operating Instructions3-1 Introduction..................................................................................................................... 3-13-2 Initial Start-Up and Operating Procedures...................................................................... 3-1Section 4Principles of Operation4-1 Introduction..................................................................................................................... 4-14-2 RF Input Signal............................................................................................................... 4-14-3 RF Output Load.............................................................................................................. 4-14-4 Amplifier Functional Description..................................................................................... 4-14-4.1 Input Amplifier................................................................................................................. 4-14-4.2 Predistortion Amplifier ....................................................................................................4-14-4.3 Driver Amplifier ............................................................................................................... 4-24-4.4 Main Amplifier................................................................................................................. 4-24-4.5 Multifunction Board......................................................................................................... 4-24-5 Amplifier Module Cooling................................................................................................ 4-24-5 Power Distribution...........................................................................................................4-2
044-xxxxx Rev. x iiiTABLE OF CONTENTS (Continued)Par. Section 5 PageNo. Maintenance No.5-1 Introduction..................................................................................................................... 5-15-2 Periodic Maintenance ..................................................................................................... 5-15-3 Test Equipment Required For Test ................................................................................ 5-15-4 Performance Test........................................................................................................... 5-25-4.1 Amplifier Performance Test............................................................................................ 5-25-5 Field Replacement of the Module................................................................................... 5-5Section 6Troubleshooting6-1 Introduction.......................................................................................................................6-16-2 Troubleshooting................................................................................................................6-16-3 Return for Service Procedures .........................................................................................6-16-3.1 Obtaining an RMA ............................................................................................................6-16-3.2 Repackaging for Shipment ...............................................................................................6-1LIST OF ILLUSTRATIONSFigure PageNo. No.1-1 NTGY81AC Multichannel Power Amplifier ..................................................................... 1-32-1 +26 Vdc Power and Ground Connector P1 .................................................................... 2-22-2 Alarms and Sensing Connector P2 ................................................................................ 2-32-3 Differential IIC Clock, Receive, and Transmit Connector P3.......................................... 2-42-4 IIC, Power, Alarms, and Controls Connector P4 ............................................................ 2-42-5 IIC, RS485, Power and Other Connector P5.................................................................. 2-64-1 NTGY81AC Multichannel Power Amplifier Functional Block Diagram ........................... 4-25-1 NTGY81AC Amplifier Test Setup Diagram .................................................................... 5-3LIST OF TABLESTable PageNo. No.1-1 NTGY81AC Multichannel Power Amplifier Functional Specifications..... ....................... 1-22-1 +26 Vdc Power and Ground Connector P1 Definition .................................................... 2-22-2 Alarms and Sensing Connector P2 Definition ................................................................ 2-32-3 Differential IIC Clock, Receive, and Transmit Connector P3 Definition.......................... 2-42-4 IIC, Power, Alarms, and Controls Connector P4 Definition ............................................ 2-52-5 IIC, RS485, Power and Other Connector P5 Definition.................................................. 2-65-1 Periodic Maintenance ..................................................................................................... 5-15-2 Test Equipment Required............................................................................................... 5-25-3 Multichannel Power Amplifier NTGY81AC Test Data Sheet .......................................... 5-46-1 Troubleshooting..............................................................................................................6-1
044-xxxxx Rev. x 1-1GENERAL DESCRIPTION1-1. INTRODUCTIONThis manual contains information and procedures for installation, operation, and maintenance ofPowerwave’s model NTGY81AC multichannel power amplifier (MCPA). The manual is organizedinto six sections as follows:Section 1. General DescriptionSection 2. InstallationSection 3. Operating InstructionsSection 4. Principles of OperationSection 5. MaintenanceSection 6: Troubleshooting1-2. GENERAL DESCRIPTIONThe NTGY81AC is a linear, multichannel power amplifier that operates in the 60 MHz frequencyband from 1930 MHz to 1990 MHz. It is designed to be mounted in an enclosure with EMIcontainment. Its flat base plate allows for mounting on a flat thermal-absorbing surface to provideadequate heat dissipation.Each amplifier module has a power, alarm, and control connector that allows the host system tomonitor the amplifier module performance. Primary power for the amplifier is +26 Vdc.1-3. FUNCTIONAL AND PHYSICAL SPECIFICATIONSFunctional and physical specifications for the amplifier are listed in table 1-1.Section1
044-xxxxx Rev. x 1-2Table 1-1. NTGY81AC Multichannel Power Amplifier Functional SpecificationsFrequency Range 1930-1990 MHz (60 MHz Bandwidth)Maximum Average Input Power 13 dBmContinuous Average Output Power 50 WattsSpurious Emissions @ MaximumRated Output Power(50 W / 47 dBm)Frequency Offset Requirement Meas. BandwidthMax. Min.0.885-1.25 MHz -47 dBc 30 kHz1.25-1.98 MHz -16.5 dBm 37.5 kHz1.98-2.25 MHz -58 dBc 30 kHz >2.25 MHz -15 dBm 1 MHzRF Gain 47 ±2 dBGain Flatness: ± 0.2 dB for any 1.25-MHz band within frequency range.Output Protection: Mismatch ProtectedInput Port Return Loss: VSWR 2:1 Max.Out of Band Spurious: Less than -15 dBm / 1 MHzDC Input Power: +26 ± 0.5 Vdc, 260 mV p-p max. ripple, ≤500 wattsOperating Temperature: -15 ºC. to +85 ºC. (heatsink temperature)Storage Temperature: -40 ºC. to +85 ºC.Operating Humidity: 5 % - 95 % Relative Humidity (Noncondensing)Storage Humidity: 5 % - 95 % Relative Humidity (Noncondensing)Interface Connectors:RF Input-----------------------------------RF Output --------------------------------+26 Vdc Power and Ground ---------Alarms and Sensing -------------------Differential IIC Clock, Rcv., Xmit.---IIC, Power, Alarms, Controls---------IIC, RS485, Power, Other Signals --SMA FemaleSMA Female3W3 D-Sub (Connector P1)14-Position Micro-Fit 3.0 (Connector P2)6-Position Micro-Fit 3.0 (Connector P3)26-Position High Density D-Sub (Connector P4)18-Position Micro-Fit 3.0 (Connector P5)Dimensions (inches): 11.00 x 14.50; height: 1.70
044-xxxxx Rev. x 1-3P1P4P5P3P2RF OUT RF INFigure 1-1. NTGY81AC Multichannel Power Amplifier
044-xxxxx Rev. x 2-1INSTALLATION2-1. INTRODUCTIONThis section contains unpacking, inspection, and installation instructions and recommendationsfor the Model NTGY81AC Multi Channel Power Amplifier. Carefully read all material in thissection prior to equipment unpacking or installation. Also read and review the operatingprocedures in Section 3 prior to installing the equipment. It is important that the licensee performthese tasks correctly and in good faith. If applicable, carefully read the appropriate parts of theFederal Communications Commission (FCC) rules to determine how they apply to yourinstallation. DON'T TAKE CHANCES WITH YOUR LICENSE.2-2. ELECTRICAL SERVICE RECOMMENDATIONSPowerwave Technologies recommends that proper AC line conditioning and surge suppressionbe provided on the primary AC input to the +26 Vdc power source. All electrical service should beinstalled in accordance with the National Electrical Code, any applicable state or local codes, andgood engineering practice. Special consideration should be given to lightning protection of allsystems in view of the vulnerability of most transmitter sites to lightning. Lightning arrestors arerecommended in the service entrance. Straight, short ground runs are recommended. Theelectrical service must be well grounded.Each amplifier system should have its own circuit breaker, so a failure in one does not shut off thewhole installation. Circuit breakers should be thermal type, capable of handling the maximumanticipated inrush current, in a load center with a master switch.2-3. UNPACKING AND INSPECTIONThis equipment has been operated, tested and calibrated at the factory. Carefully open thecontainer(s) and remove the amplifier module(s). Retain all packing material that can bereassembled in the event that the unit must be returned to the factory.CAUTIONExercise care in handling equipmentduring inspection to prevent damagecaused by rough or careless handling.Visually inspect the amplifier module for damage that may have occurred during shipment. Checkfor evidence of water damage, bent or warped chassis, loose screws or nuts, or extraneouspacking material in the connector. If the equipment is damaged, a claim should be filed with thecarrier once the extent of any damage is assessed. We cannot stress too strongly the importanceof IMMEDIATE careful inspection of the equipment and the subsequent IMMEDIATE filing of thenecessary claims against the carrier if necessary. If possible, inspect the equipment in thepresence of the delivery person. If the equipment is damaged, the carrier is your first area ofrecourse. If the equipment is damaged and must be returned to the factory, write or phone for areturn authorization. Powerwave may not accept returns without a return authorization. Claimsfor loss or damage may not be withheld from any payment to Powerwave, nor may any paymentdue be withheld pending the outcome thereof. WE CANNOT GUARANTEE THE FREIGHTCARRIER'S PERFORMANCESection2
044-xxxxx Rev. x 2-22-4. INSTALLATION INSTRUCTIONS (Refer to figure 1-1)The NTGY81AC amplifier module is designed for installation on a heatsink that permits access tothe module for connection of RF cables and the power, alarm, and control connector.To install the amplifier proceed as follows:1. Install amplifier on heatsink with thermally conductive material inserted between amplifiermodule and heatsink, and secure in place with appropriate mounting screws. 2. Connect the antenna cable to RF OUT female SMA connector. 3. Connect the transceiver output cable to RF IN frmale SMA connector. WARNINGTurn off external primary DC powerbefore connecting any cables. 4. Connect power, alarm, and control cables to matching P1 through P5 connectors. Refer toparagraphs 2-5 through 2-9 following.6. Check your work before applying DC voltage to the system. Make certain all connections aretight and correct. 7. Measure primary DC input voltage. DC input voltage should be +26 ±0.5 Vdc. If the DC inputvoltage is above or below the limits, call and consult Powerwave before you turn on youramplifier system. 8. Refer to section 3 for initial turn-on and checkout procedures.2-5. +26 VDC POWER AND GROUND CONNECTOR P1The +26 Vdc power and ground connections on the amplifier are made through an 3-pin femaleD-Sub connector (figure 2-1) and are listed and described in table 2-1.321Figure 2-1. +26 Vdc Power and Ground Connector P1Table 2-1. +26 Vdc Power and Ground Connector P1 DefinitionPIN SIGNAL DESCRIPTION1 +26V +26 Vdc for MCPA2 +26V_RTN +26 Vdc return, grounded to MCPAchassis ground.3 Chassis Gnd. Chassis Ground
044-xxxxx Rev. x 2-32-6. ALARMS AND SENSING CONNECTOR P2The alarms and sensing connections on the amplifier are made through a 14-pin micro-fitconnector (figure 2-2) and are listed and described in table 2-2.Figure 2-2. Alarms and Sensing Connector P2Table 2-2. Alarms and Sensing Connector P2 DefinitionPIN SIGNAL DESCRIPTION1 +5V_AIM 5-volt supply for the AIM; routed directly to the fanassembly / AIM connector2 +5V_AIM_RTN 5-volt supply return for the AIM; routed directly to the fanassembly / AIM connector3 +26V_ALARM 26V HPCA alarm input4 +15V_ALARM 15V HPCA alarm input5 REMOTE_SENSE Remote sense for HPCA; connected directly to 26Vsupply6 REMOTE_SENSE_RTN Remote sense return for HPCA; connected directly to 26Vsupply return7 +5V_ALARM 5V HPCA alarm input8 NC Not connected9 26ARTN 26V alarm return connected to 26V return on the MCPA10 ARTN 5V and 15V alarm return connected to 26V return on theMCPA11 +26V_FAN 26V supply for the fans; routed to fan assembly / AIMconnector12 +26V_FAN_RTN 26V supply return for the fans; routed to fan assembly /AIM connector13 +26V_FAN 26V supply for the fans; routed to fan assembly/ AIM connector14 +26V_FAN_RTN 26V supply return for the fans; routed to fan assembly /AIM connector
044-xxxxx Rev. x 2-42-7. DIFFERENTIAL IIC CLOCK, RECEIVE, AND TRANSMIT CONNECTOR P3The alarms and sensing connections on the amplifier are made through a 6-pin micro-fitconnector (figure 2-3) and are listed and described in table 2-3.Figure 2-3. Differential IIC Clock, Receive, and Transmit Connector P3Table 2-3. Differential IIC Clock, Receive, and Transmit Connector P3 DefinitionPIN SIGNAL DESCRIPTION1 IIC_CLK+ Differential IIC Clock to the DPM2 IIC_CLK- Differential IIC Clock to the DPM3 IIC_RX_DATA+ Differential IIC Receive Data (from DPM)4 IIC_RX_DATA- Differential IIC Receive Data (from DPM)5 IIC_TX_DATA+ Differential IIC Transmit Data (to DPM)6 IIC_TX_DATA- Differential IIC Transmit Data (to DPM)2-8. IIC, POWER, ALARMS, AND CONTROLS CONNECTOR P4The alarms and sensing connections on the amplifier are made through a 26-pin high densityD-Sub connector (figure 2-4) and are listed and described in table 2-4.Figure 2-4. IIC, Power, Alarms, and Controls Connector P4
044-xxxxx Rev. x 2-5Table 2-4. IIC, Power, Alarms, and Controls Connector P4 DefinitionPIN SIGNAL DESCRIPTION1 +26_FAN 26V supply to the fans; routed from 12-position HPCAconnector2 +26_FAN_RTN 26V supply returnto the fans; routed from 12-positionHPCA connector3 FAN_ALARM1 Alarm for one of three fans in fan assembly / AIM.Generated by the fan assembly / AIM and sent to theMFRM via the MCPA’s RS485 link.4 FAN_ALARM2 Alarm for one of three fans in fan assembly / AIM.Generated by the fan assembly / AIM and sent to theMFRM via the MCPA’s RS485 link.5 FAN_ALARM3 Alarm for one of three fans in fan assembly / AIM.Generated by the fan assembly / AIM and sent to theMFRM via the MCPA’s RS485 link.6 AUX_ALARM+ Analog voltage signal that is generated from either anexternal power combiner or an intrusion alarmmechanism, passed to the MFRM through the RS485.7 AUX_ALARM- Analog voltage signal that is generated from either anexternal power combiner or an intrusion alarmmechanism, passed to the MFRM through the RS485.8 AUX_CTRL1 Contact closure switch on the MCPA but controlled by theMFRM software. Default status is OPEN upon power upand CLOSED on power down conditions.9 AUX_CTRL2 Contact closure switch on the MCPA but controlled by theMFRM software. Default status is OPEN upon power upand CLOSED on power down conditions.10 +5V_AIM_RTN 5V supply return for the AIM. Comes from the HPCA viaconnector P2 and routed through MCPA.11 +5V_AIM 55VV ssuuppppllyy ffoorr tthhee AAIIMM.. CCoommeess ffrroomm tthhee HHPPCCAA vviiaaccoonnnneeccttoorr PP22 aanndd rroouutteedd tthhrroouugghh MMCCPPAA12 IIC_CLK+ Differential IIC clock to the fan assembly / AIM13 IIC_CLK- Differential IIC clock to the fan assembly / AIM14 IIC_RX_DATA+ Differential IIC receive data (from fan assembly / AIM)15 IIC_RX_DATA- Differential IIC receive data (from fan assembly / AIM)16 IIC_TX_DATA+ Differential IIC transmit data (to fan assembly / AIM)17 IIC_TX_DATA- Differential IIC transmit data (to fan assembly / AIM)18 FORCE_ON+ Routed directly from MTRM connector; turns on LEDs (inthe AIM) during power-up sequence.19 FORCE_ON- Routed directly from MTRM connector; turns on LEDs (inthe AIM) during power-up sequence.20 +26V_FAN 26V supply for the fans from (HPCA) connector P221 +26V_FAN_RTN 26V supply return for the fans from (HPCA) connector P222-26 NC Not connected
044-xxxxx Rev. x 2-62-9. IIC, RS485, POWER, AND OTHER SIGNALS CONNECTOR P5The alarms and sensing connections on the amplifier are made through a 18-pin micro-fitconnector (figure 2-5) and are listed and described in table 2-5.Figure 2-5. IIC, RS485, Power, and Other Signals Connector P5Table 2-5. IIC, RS485, Power, and Other Signals Connector P5 DefinitionPIN SIGNAL DESCRIPTION1 FORCE_ON+ Turns on LEDs (in the AIM) during power up sequence;routed directly from MTRM connector to fan assembly /AIM connector2 FORCE_ON- Turns on LEDs (in the AIM) during power up sequence;routed directly from MTRM connector to fan assembly /AIM connector3 +ALLOW_HPA_ENABLE Enables MCPA when high. Requires enable commandvia RS485 and HW_ENABLE high impedance to groundand no shutdown conditions exist.4 -ALLOW_HPA_ENABLE Enables MCPA when high. Requires enable commandvia RS485 and HW_ENABLE high impedance to groundand no shutdown conditions exist.5 MCPA_TX+ Differential RS485 link to MTRM6 MCPA_TX- Differential RS485 link to MTRM7 MCPA_RX+ Differential RS485 link from MTRM8 MCPA_RX- Differential RS485 link from MTRM9 IIC_CLK+ Differential IIC clock from MTRM10 IIC_CLK- DDiiffffeerreennttiiaall IIIICC cclloocckk ffrroomm MMTTRRMM11 IIC_RX_DATA+ DDiiffffeerreennttiiaall IIIICC rreecceeiivvee ddaattaa ((ffrroomm MMTTRRMM))12 IIC_RX_DATA- DDiiffffeerreennttiiaall IIIICC rreecceeiivvee ddaattaa ((ffrroomm MMTTRRMM))13 IIC_TX_DATA+ DDiiffffeerreennttiiaall IIIICC ttrraannssmmiitt ddaattaa ((ttoo MMTTRRMM))14 IIC_TX_DATA- DDiiffffeerreennttiiaall IIIICC ttrraannssmmiitt ddaattaa ((ttoo MMTTRRMM))15 +5V_DC_IN +5V supply voltage for the IIC circuit on MCPA; not usedin any other circuits.16 +5V_DC_RTN +5V supply voltage return for the IIC circuit on MCPA; notused in any other circuits.17 CABLE_DETECTCable detect line connected to GPI/O port of MTRMmicroprocessor. Pulled high via +5V_DC_IN; connectedto reset pin on microcontroller to allow MTRM reset ifnecessary.18 HW_ENABLE Hardware enable signal. MCPA enabled when shorted tochassis ground.
044-xxxxx Rev. x 3-1OPERATING INSTRUCTIONS3-1. INTRODUCTIONThis section contains operating instructions for the Multicarrier Cellular Amplifier.3-2. INITIAL START-UP AND OPERATING PROCEDURESThere are no operating controls or indicators on the NTGY81AC amplifier module. To perform theinitial start-up, proceed as follows:1. Double check to ensure that all input and output cables are properly connected.CAUTIONBefore applying power, make sure that the input and output of theamplifier are properly terminated at 50 ohms. Do not operate theamplifier without a load attached. Refer to table 1-1 for input powerrequirements. Excessive input power may damage the amplifierNOTEThe output coaxial cable between the amplifier and the antenna mustbe 50 ohm coaxial cable. Use of any other cable will distort the output.2. Turn on supply that provides +26 Vdc to the amplifier system.3. Turn on external exciter/transceiver and apply RF input signals.Section3
044-xxxxx Rev. x 4-1PRINCIPLES OF OPERATION4-1. INTRODUCTIONThis section contains a functional description of the multichannel power amplifier (MCPA).4-2. RF INPUT SIGNALThe maximum input power should not exceed the limits specified in table 1-1.4-3. RF OUTPUT LOADThe load impedance should be as good as possible (1.5:1 or better) in the working band for goodpower transfer to the load.4-4. AMPLIFIER FUNCTIONAL DESCRIPTIONThe NTGY81AC amplifier (figures 1-1 and 4-1) is a linear, multichannel power amplifier thatoperates in the 60 MHz frequency band from 1930 MHz to 1990 MHz at an output power of 50watts. Each amplifier is a self-contained module and is functionally independent of any otheramplifier modules in the system. Each amplifier module has an alarm board that monitors theamplifier performance. If a failure or fault occurs in an amplifier module, it is transmitted to thehost system via an RS485 interface.The amplifier is compliant to the requirements of FCC Part 24 with respect to spurious emissions(see table 1-1). Constant gain is maintained by continuously comparing active paths with passivereferences, and correcting for small variations through the RF feedback controls. All gainvariations, for example those due to temperature, are reduced to the passive reference variations.The amplifier module is comprised of:An input amplifierA predistortion amplifierA driver amplifierA main amplifierA multifunction board4-4.1. INPUT AMPLIFIERRF is fed to the input amplifier, which consists of an isolator at the input, bandpass filter, VVAs,and phase shifters for gain control and phase sweeping functions. They are controlled by amicroprocessor on the multifunction board. At its output, the input amplifier splits the signal to thepredistortion amplifier and carrier cancellation circuits.4-4.2. PREDISTORTION AMPLIFIERThe predistortion amplifier predistorts the input signal in a way that it linearizes the output of themain amp at 50 watts. It also contains the main loop VVAs and phase shifters. All the predistortionvoltages and loop voltages are controlled by a microprocessor.Section4
044-xxxxx Rev. x 4-24-4.3. DRIVER AMPLIFIERThe driver amplifier consists of two stages of class AB amplification which provide approximately40 dB of gain in the 60 MHz frequency band from 1930 MHz to 1990 MHz. The amplifier operateson +26 Vdc, and a safe bias voltage which is controlled by microprocessors.4-4.4. MAIN AMPLIFIERThe main amplifier employs two class AB amplification stages for maximum efficiency. It providesapproximately 25 dB of gain in the 60 MHz frequency band. The output from the main amplifier istypically 48.6 dBm. The amplifier operates on +26 Vdc, and gate bias voltages controlled bymicroprocessors.4-4.5. MULTIFUNCTION BOARDThe multifunction board consists of control and alarm circuits. The MCPA communicates to thehost system through the multifunction board which gathers the status information of the amplifierand reports to the host system via the RS485 interface when instructed. It also protects the MCPAfrom adverse conditions such as overpower, input overdrive, overvoltage, etc. A microprocessoron the multifunction board also controls two loops in the feed-forward system.4-5. AMPLIFIER MODULE COOLINGEach amplifier module is contained within a thermally conductive chassis which, when properlymounted on an adequate thermal surface, will provide sufficient cooling to maintain the amplifierwithin the specified operating temperature range.4-6. POWER DISTRIBUTIONPrimary DC power for the amplifier is provided by the host system. The amplifier generates all therequired voltages internally from the main source.Figure 4-1. NTGY81AC Multichannel Power Amplifier Functional Block DiagramRFININPUTAMPLIFIER PREDISTORTIONAMPLIFIER DRIVERAMPLIFIER MAINAMPLIFIERRFOUTMULTIFUNCTION BOARD(ALARMS AND LOOP CONTROLS)
044-xxxxx Rev. x 5-1MAINTENANCE5-1. INTRODUCTIONThis section contains periodic maintenance and performance test procedures for the multichannelpower amplifier. It also contains a list of test equipment required to perform the identified tasks.NOTECheck your sales order and equipment warrantybefore attempting to service or repair the unit. Donot break the seals on equipment under warranty orthe warranty will be null and void. Do not returnequipment for warranty or repair service until propershipping instructions are received from the factory.5-2. PERIODIC MAINTENANCEPeriodic maintenance requirements are listed in Table 5-1. Table 5-1 also lists the intervals atwhich the tasks should be performed.Table 5-1. Periodic MaintenanceTASK INTERVAL ACTIONInspectionCables andConnectors 12 Months Inspect signal and power cables forfrayed insulation. Check RF connectorsto be sure that they are tight.Performance Tests 12 Months Perform annual test per paragraph 5-5.5-3. TEST EQUIPMENT REQUIRED FOR TESTTest equipment required to test the amplifier is listed in Table 5-2. Equivalent test equipment maybe substituted for any item, keeping in mind that a thermistor type power meter is required.NOTEAll RF test equipment must be calibrated to 0.05dB resolution. Any deviation from the nominalattenuation must be accounted for and factoredinto all output readings.Section5
044-xxxxx Rev. x 5-2Table 5-2. Test Equipment RequiredMENCLATURE MANUFACTURER MODELSignal Generator Agilent (H.P.) ESG4433B30 dB Attenuator, 250 Watt TenulineSpectrum Analyzer H.P. 8562ECoax Directional Coupler H.P. 778DPower Meter / Sensor H.P. 437B / 8481ANetwork Analyzer H.P. 8753DCurrent ProbeSource Diskette PowerwaveDriver PA (1930-1990 MHz) 12 dB gain, P1dB = 29 dBm (min)5-4. PERFORMANCE TESTPerformance testing should be conducted every 12 months to ensure that the amplifier systemmeets the operational specifications listed in table 5-3. Also verify system performance after anyamplifier module is replaced in the field. The test equipment required to perform the testing islisted in table 5-2, and the test setup is shown in figure 5-1.5-4.1. AMPLIFIER PERFORMANCE TEST.To perform the test, proceed as follows:1. Connect test equipment as shown in figure 5-1.NOTEDo not apply any RF signals at this time.AMPLIFIER SPURIOUS EMISSIONS TEST:2. Load the MFRM waveform on the ESG (signal generator). Apply this signal through adriver amplifier to the MCPA so that the RF signal going into the MCPA is approximately 0dBm (adjust the input RF signal level to get 47 dBm output power). Measure spuriousemissions. Verify that it is within specification.GAIN TEST:3. Set input power level to power amplifier at 0 dBm (1932, 1960, and 1987 MHz).4. Measure the output power in dBm.5. Subtract input power (in dBm) from output power (in dBm) to get gain.6. Check the amplifier gain across the band from 1930 MHz to 1990 MHz. Gain should be47 ±2 dB. Record test data in table 5-3.INPUT RETURN LOSS TEST:7. Read and record the S11 return loss measurement on network analyzer. Record test datain table 5-3.
044-xxxxx Rev. x 5-3Figure 5-1. NTGY81AC Amplifier Test Setup Diagram
044-xxxxx Rev. x 5-4Table 5-3. Multichannel Power Amplifier NTGY81AC Test Data SheetTested By: ___________________ Serial No: ________________Pass/Fail: ____________________ Date: ____________________50W MCPA TestTest Conditions: Load and source impedance: 50 ohms, VSWR < 1.2:1Supply voltage: +26 Vdc ±±±± 0.4 Vdc (unless otherwise noted).Network Analyzer Span: 60 MHzMarker #1 = 1930 MHz, #2 = 1960 MHz, #3 = 1990 MHzTEST CONDITION MIN MAX FREQUENCY (MHz)1.00 NETWORK ANALYZER 1930 1960 19901.01 Gain 45.0 dB 49.0 dB1.02 Gain Flatness 0 dB 0.4 dB/1.25 MHz1.03 Input Return Loss, worst case In band -10 dB1.04 Output Return Loss, worst case in band -15 dB2.00 CDMA TESTS (Spurious Emissions)3 TONE: W-CDMA @ 50W outRBW= 3KHz; VBW=10KHz2.01 ∆ @ +2.25 Mhz -16 dBm/1 MHz2.02 ∆ @ –2.25 Mhz -16 dBm/1 MHz2.03 2nd Harmonic 3860 3920 3980-16 dBm/1 MHz2.04 Pilot 1925 1945 196516 dBm/1 MHz2.05 Current @ 50 W out 19 A
044-xxxxx Rev. x 5-55-5. FIELD REPLACEMENT OF THE MODULEThe NTGY81AC multichannel power amplifier module can be replaced in the field on site by aqualified technician with adequate ESD protection and experience maintaining RF poweramplifiers and similar equipment.To replace a power amplifier module, proceed as follows:1. Turn off 26 Vdc power to that specific module.2. Disconnect the two RF cables and connectors P1 through P5.3. Remove 13 screws that secure amplifier module to heat sink.4. Carefully remove amplifier module from heat sink.5. Add Thermstrate thermal interface pad to surface of replacement amplifier whichmates with heatsink.6. Install replacement in reverse order of steps 1 through 4 above.
044-xxxxx Rev. x 6-1TROUBLESHOOTING6-1 INTRODUCTIONThis section contains a list of problems which users have encountered and a few suggestedactions that may correct the problem. If the suggested corrective action does not eliminate theproblem, please contact your Powerwave field representative or the factory for further instructions.NOTECheck your sales order and equipment warrantybefore attempting to service or repair the unit. Donot break the seals on equipment under warranty orthe warranty will be null and void. Do not returnequipment for warranty or repair service until propershipping instructions are received from the factory.6-2 TROUBLESHOOTINGRefer to table 6-1 for troubleshooting suggestions.Table 6-1. Troubleshooting.SYMPTOM SUGGESTED ACTIONMCPA Inoperative 1. Check for proper power supply voltage.MCPA Not Enabled 1. Verify HPA-Allow-Enable line is high.Alarm Output is (RS 422) High Verify input RF is within specified power and frequency limits6-3 RETURN FOR SERVICE PROCEDURESWhen returning products to Powerwave, the following procedures will ensure optimum response.6-3.1 Obtaining an RMAA Return Material Authorization (RMA) number must be obtained prior to returningequipment to the factory for service. Please contact our Repair Department at (888) 797-9283 or (714) 466-1000 to obtain this number, or FAX your request to (714) 466-5816.Failure to obtain this RMA number may result in delays in receiving repair service.6-3.2 Repackaging for ShipmentTo ensure safe shipment of the amplifier, it is recommended that the package designedfor the amplifier be used. The original packaging material is reusable. If it is notavailable, contact Powerwave’s Customer Service Department for packing materials andinformation.Section6

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