Powerwave Technologies 5JS0030 SINGLE CHANNEL CELLULAR AMPLIFIER User Manual 8750

Powerwave Technologies Inc SINGLE CHANNEL CELLULAR AMPLIFIER 8750

user manual

044-05045 Rev. AINSTALLATION & SERVICEMANUALSINGLE CHANNELPOWER AMPLIFIERNTGS86AA869-894 MHz25 WATTS AVERAGE POWER12 August 1998Powerwave Technologies, Inc. Tel: 949-757-05302026 McGaw Avenue Fax: 949-757-0941Irvine, CA 92614 Web Site: www.pwav.comTABLE OF CONTENTS®
2Par. 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 Amplifier Module Power, Alarm, and Control Connector........................ 2-22-6 RS485 Connector................................................................................... 2-3Section 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 Main Amplifier ........................................................................................ 4-24-4.2 Amplifier Monitoring ............................................................................... 4-34-4.3 Amplifier Module Cooling ....................................................................... 4-34-5 Power Distribution .................................................................................. 4-3Section 5Maintenance5-1 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 .......................................................... 5-7
3TABLE OF CONTENTS (Continued)Par. Section 6 PageNo. Troubleshooting No.6-1 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 NTGS86AA Single Channel Power Amplifier ......................................... 1-32-1 Power, Alarm, and Control Connector (18-Pin Molex) ........................... 2-22-2 RS485 Connector................................................................................... 2-34-1 NTGS86AA Single Channel Power Amplifier Functional Block Diagram 4-25-1 NTGS86AA Amplifier Test Setup Diagram ............................................ 5-35-2 RF Input (CDMA Source) ....................................................................... 5-3LIST OF TABLESTable PageNo. No.1-1 NTGS86AA Single Channel Power Amplifier Functional Specifications.....1-22-1 18-Pin Molex Alarm, Control, and Power Connections .......................... 2-32-2 RS485 Pin Definition.............................................................................. 2-35-1 Periodic Maintenance............................................................................. 5-15-2 Test Equipment Required ...................................................................... 5-25-3 Single Channel Power Amplifier Test Data Sheet.................................. 5-46-1 Troubleshooting ..................................................................................... 6-1
4SectionGENERAL DESCRIPTION1-1. INTRODUCTIONThis manual contains information and procedures for installation, operation, and maintenance ofPowerwave’s model NTGS86AA single channel power amplifier (SCPA). 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 NTGS86AA is a linear, single-channel power amplifier that operates in the 25 MHz frequencyband from 869 MHz to 894 MHz. It is designed as a self-contained module with EMI containmentfor use in both an indoor and outdoor North American Cellular Base Stations. Its flat base plateallows for mounting on a flat thermal-absorbing surface to provide adequate heat dissipation,thereby avoiding the use of any built-in fans.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 1-1.1
5Table 1-1. NTGS86AA Single Channel Power Amplifier Functional SpecificationsFrequency Range 869-894 MHz (25 MHz Bandwidth)Maximum Average Input Power 13 dBmContinuous Average Output Power 25 WattsSpurious Emissions @ MaximumRated Output Power (44 dBm)Frequency Requirement Meas. Bandwidth750 kHz offset -46 dBc 30 kHz1.23 MHz offset -61 dBc 30 kHz1.5 MHz offset -61 dBc 30 kHz1.98 MHz offset -61 dBc 30 kHzRF Gain 43 ±2 dBGain Flatness: ± 0.15 dB for any 2-MHz band within frequency range.Output Protection: Mismatch ProtectedInput Port Return Loss: VSWR 2:1 Max.Out of Band Spurious: Less than -14 dBmDC Input Power: +26 ± 0.5 Vdc, 260 mV p-p max. ripple, ≤350 wattsOperating Temperature: -15 ºC. to +85 ºC. (heatsink temperature)Storage Temperature: -40 ºC. to +70 ºC.Operating Humidity: 5 % - 95 % Relative Humidity (Noncondensing)Storage Humidity: 5 % - 95 % Relative Humidity (Noncondensing)DC Input, Alarm, and ControlConnector:18-Pin MolexRF Input Connector: SMA FemaleRF Output Connector: SMA FemaleRF Sample Connector: SMA Female (27±1 dB below RF Output)Dimensions (inches): Width: 12.515; depth: 9.900; height: 1.670
6RF OUTPUTRF INPUT18 PIN MOLEX CONNECTORRF SAMPLERS485 CONNECTOR9.90012.5151.670Figure 1-1. NTGS86AA Single Channel Power Amplifier
7SectionINSTALLATION2-1. INTRODUCTIONThis section contains unpacking, inspection, and installation instructions and recommendations forthe Model NTGS86AA Single Channel Power Amplifier. Carefully read all material in this sectionprior to equipment unpacking or installation. Also read and review the operating procedures inSection 3 prior to installing the equipment. It is important that the licensee perform these taskscorrectly and in good faith. If applicable, carefully read Parts 73 and 74 of the FederalCommunications Commission (FCC) rules to determine how they apply to your installation. DON'TTAKE CHANCES WITH YOUR LICENSE.2-2. ELECTRICAL SERVICE RECOMMENDATIONSPowerwave Technologies recommends that proper AC line conditioning and surge suppression beprovided 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 extraneous packingmaterial in the connector. If the equipment is damaged, a claim should be filed with the carrieronce the extent of any damage is assessed. We cannot stress too strongly the importance ofIMMEDIATE 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. Claims forloss or damage may not be withheld from any payment to Powerwave, nor may any payment duebe withheld pending the outcome thereof. WE CANNOT GUARANTEE THE FREIGHTCARRIER'S PERFORMANCE2
82-4. INSTALLATION INSTRUCTIONS (Refer to figure 1-1)The NTGS86AA 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 four mounting screws. 2. Connect the antenna cable to RF OUT SMA connector. 3. Connect the transceiver output cable to RF IN SMA connector.4. Connect coupled RF output monitor cable to RF SAMPLE SMA connector. WARNINGTurn off external primary DC power beforeconnecting cable to 18-pin Molex connector. 5. Connect power, alarm, and control cable to 18-pin Molex connector.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. AMPLIFIER MODULE POWER, ALARM, AND CONTROL CONNECTORThe power, alarm, and control connections on the amplifier are made through an 18-pin Molexconnector (figure 2-1) and are listed and described in table 2-1.Figure 2-1. Power, Alarm, and Control Connector (18-Pin Molex)
9TTaabbllee 22--11.. 1188--PPiinn MMoolleexx AAllaarrmm,, CCoonnttrrooll,, aanndd PPoowweerr CCoonnnneeccttiioonnssPIN SIGNAL DESCRIPTION SIGNAL NAME1 Temperature Output (0-4.7 volts) TEMP_OUT2 Reverse Power Detection (0-4.7 volts) REV_PWR3 Forward Power Detection (0-4.7 volts) FWR_PWR4 Ground GND5NCNA6− Anxiety output (RS 422 level) ANX (-)7 Ground GND8 Ground GND9 Ground GND10 + Anxiety output (RS 422 level) ANX (+)11 + Enable input (RS 422 level) ENABLE (+)12 − Enable input (RS 422 level) ENABLE (−)13 + Alarm output (RS 422 level) ALARM (+)14 − Alarm output (RS 422 level) ALARM (−)15 +26 Vdc VDD16 +26 Vdc VDD17 +26 Vdc VDD18 +26 Vdc VDD2-6. RS485 CONNECTORThe RS485 connector (figure 2-2) allows the user to monitor the status of the amplifier, downloadnew firmware, and revise the amplifier attributes. The pin connections are defined in table 2-2.Figure 2-2. RS485 ConnectorTable 2-2. RS485 Pin DefinitionPIN FUNCTION1Rxd+2Rxd−3Txd−4Txd+14
10OPERATING 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 NTGS86AA 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.PRINCIPLES OF OPERATION4-1. INTRODUCTIONThis section contains a functional description of the Single Channel PowerAmplifier (SCPA).4-2. RF INPUT SIGNALThe maximum input power should not exceed the limits specified in table 1-1.Section3Section4
114-3. RF OUTPUT LOADThe load impedance should be as good as possible (1.5:1 or better) in the workingband for good power transfer to the load.4-4. AMPLIFIER FUNCTIONAL DESCRIPTIONThe NTGS86AA amplifier (figures 1-1 and 4-1) is a linear, single-channel poweramplifier that operates in the 25 MHz frequency band from 869 MHz to 894 MHzat an output power of 25 watts. Each amplifier is a self-contained module and isfunctionally independent of any other amplifier modules in the system. Eachamplifier module has an alarm board that monitors the amplifier performance. If afailure or fault occurs in an amplifier module, it is transmitted to the host systemvia an 18-pin Molex connector.The amplifier is compliant to the requirements of FCC Part 22 and TIA/EIA IS97Awith respect to spurious emissions (see table 1-1). Constant gain is maintained bycontinuously comparing active paths with passive references, and correcting forsmall variations through the RF feedback controls. All gain variations, for examplethose due to temperature, are reduced to the passive reference variations. Theamplifier module is comprised of:A three-stage driver amplifierA main amplifierAlarm monitoring and controlA spurious emission detection DSP circuit4-4.1. THREE-STAGE DRIVER AMPLIFIERThe input of the amplifier employs three stages of class AB amplification whichprovide approximately 33 dB of gain in the 25 MHz frequency band from 869 MHzto 894 MHz. The amplifier operates on +26 Vdc, and a bias voltage of +5 Vdc,and is mounted directly on a heat sink. The alarm logic controls the +5 Vdc biasvoltage that shuts down the amplifier.4-4.2. MAIN AMPLIFIERThe main amplifier employs class AB amplification for maximum efficiency. Thesignal provides approximately 10 dB of gain in the 25 MHz frequency band. Theoutput from the main amplifier is typically 30 watts. The amplifier operates on +26Vdc, and a bias voltage of +5 Vdc, and is mounted directly on a heat sink. Thealarm logic controls the +5 Vdc bias voltage that shuts down the amplifier.
124-4.3. ALARM MONITORING AND CONTROLIn the amplifier, all normal variations are automatically compensated for by thespurious detector control. However, when large variations occur beyond theadjustment range of the loop control, a loop fault will occur. The alarms are outputvia an 18-pin Molex connector on the module for subsequent remote monitoring.4-4.4. SPURIOUS EMISSION DETECTION DSP CIRCUITThe primary function of the spurious detection circuit is to monitor the spuriousemissions mask of the RF signal at all amplifier stages. DSP circuitry is used tocontrol the phase, gain, and bias of all amplifier stages, thereby optimizing thespurious emissions mask of the CDMA output signal.4-5. AMPLIFIER MODULE COOLINGEach amplifier module is contained within a thermally conductive chassis which,when properly mounted on an adequate thermal surface, will provide sufficientcooling to maintain the amplifier within the specified operating temperature range.4-6. POWER DISTRIBUTIONPrimary DC power for the amplifier is provided by the host system. The amplifiermodule has a DC/DC converter that converts the +26 Vdc to +15 Vdc, +5 Vdc and+8 Vdc.Figure 4-1. NTGS86AA Single Channel Power Amplifier Functional BlockDiagramSPURIOUS DETECTIONDSP CIRCUITRFINPhase,Gain,andBiasControlPhase,Gain,andBiasControl33dBGain10dBGainThree StageDriver Main AmpRFOUTOptimizethespuriousemissionsmaskof theCDMAoutputsignalALARM CIRCUIT
13MAINTENANCE5-1. INTRODUCTIONThis section contains periodic maintenance and performance test procedures for the SingleChannel Power Amplifier. It also contains a list of test equipment required to perform the identifiedtasks.NOTECheck your sales order and equipmentwarranty before attempting to service orrepair the unit. Do not break the seals onequipment under warranty or the warrantywill be null and void. Do not returnequipment for warranty or repair serviceuntil proper shipping instructions arereceived 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 andConnectors12 Months IInnssppeecctt ssiiggnnaall aanndd ppoowweerr ccaabblleessffoorr ffrraayyeedd iinnssuullaattiioonn.. CChheecckk RRFFccoonnnneeccttoorrss ttoo bbee ssuurree tthhaatt tthheeyyaarree ttiigghhtt..Performance Tests 12 Months PPeerrffoorrmm aannnnuuaall tteesstt ppeerrppaarraaggrraapphh 55--55..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
14Table 5-2. Test Equipment RequiredMENCLATUREMANUFACTURER MODELSignal Generator H.P. 8656B20 dB Attenuator, 250 Watt Tenuline20 dB Attenuator, 20 Watt (2 each) TenulineSpectrum Analyzer H.P. 8560ECoax Directional Coupler H.P. 778DPower Meter / Sensor H.P. 437B / 8481AArbitrary Waveform Generator Sony AWG2021Network Analyzer H.P. 8753CCurrent ProbeSource Diskette PowerwaveCDMA Generator Noise Com 800-15-4. 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 is listedin table 5-2, and the test setup is shown in figure 5-1.NOTEThe frequencies used in this test are typical for an amplifier with a25 MHz band from 869 MHz to 894 MHz. Select evenly spacedF1, F2, F3, and F4 frequencies that cover the instantaneousbandwidth of your system.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. With the RF input signal to the amplifier set to be as shown in figure 5-2, use the spectrumanalyzer to measure the spurious emissions performance. Record test data in table 5-3.Verify that it is within the specifications shown in table 1-1. Switch tested amplifier to OFF.GAIN TEST:3. Disconnect spectrum analyzer from test setup, and connect the network analyzer.4. Set network analyzer as follows:a. Power output to 11 dBm.b. Frequency start to 869 MHz.c. Frequency stop to 894 MHz.d. Normalize the network analyzer for gain and return loss.5. Check the amplifier gain across the band from 869 MHz to 894 MHz. Gain should be asspecified in table 1-1 ±1 dB. Record test data in table 5-3.
15INPUT RETURN LOSS TEST:6. Read and record the S11 return loss measurement on network analyzer. Record test data intable 5-3.Figure 5-1. NTGS86AA Amplifier Test Setup Diagram
16Table 5-3. Single Channel Power Amplifier Test Data SheetDATE__________________________________MODULE S/N ___________________________TEST CONDITIONS:Load and Source Impedance: 50 OhmsVSWR: < 1.2:1Supply Voltage: +26 Vdc ±0.1 VdcTEST SPECIFICATION MIN MAXDATARF Gain Vcc = 26 VdcPO = 25 WFreq. = 880 MHzTable 1-1-1 dBTable 1-1+1 dBSpuriousEmissionsVcc = 26 VdcPO =25 W869 - 894 MHz Band-65 dBcGain Flatness Vcc = 26 VdcPO =25 W869 - 894 MHz Band±0.7 dBInput ReturnLossVcc = 26 VdcPO = 25 W869-894 MHz Band-18 dBPASS FAIL Tested by
175-5. FIELD REPLACEMENT OF THE MODULEThe NTGS86AA single channel power amplifier module can be replaced in the field on site by aqualified technician with experience maintaining RF power amplifiers 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 three RF cables, 18-pin Molex cable, and RS485 cable.3. Loosen four screws that secure amplifier module to heat sink.4. Carefully remove amplifier module from heat sink.5. Install replacement in reverse order of steps 1 through 4 above.TROUBLESHOOTING6-1 INTRODUCTIONThis section contains a list of problems which users have encountered and a few suggested actionsthat may correct the problem. If the suggested corrective action does not eliminate the problem,please contact your Powerwave field representative or the factory for further instructions.NOTECheck your sales order and equipmentwarranty before attempting to service orrepair the unit. Do not break the seals onequipment under warranty or the warrantywill be null and void. Do not returnequipment for warranty or repair serviceuntil proper shipping instructions arereceived from the factory.6-2 TROUBLESHOOTINGRefer to table 6-1 for troubleshooting suggestions.Table 6-1. Troubleshooting.SYMPTOM SUGGESTED ACTIONSCPA Inoperative 1. Check for proper power supply voltage.SCPA Not Enabled 1. Verify RS 422 + (ENABLE signal) is high.Anxiety Output is RS 422High11.. VVeerriiffyy DDCC ssuuppppllyy iiss ≤≤2288..55±±00..2255 VVddcc2. Verify TEMP_OUT <5 °C above maximum sensor temp.3. Verify RF input <6 dBm ±0.5 dB; remove overdrive andtoggle ENABLE input.Section6
18Alarm 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 Customer Service Department at(949) 757-0530 to obtain this number. Failure to obtain this RMA number will result inconsiderable delays in receiving repair service.6-3.2 Repackaging for ShipmentTo ensure safe shipment of the amplifier, it is recommended that the package designed forthe amplifier be used. The original packaging material is reusable. If it is not available,contact Powerwave’s Customer Service Department for packing materials and information.

Navigation menu