Paradigm Wireless Systems MAF800-100S Multi-Carrier Power Amplifier User Manual

Paradigm Wireless Systems Inc Multi-Carrier Power Amplifier

User Manual

REPORT RC055097/28116APPENDIX ASERVICE/OPERATING MANUAL
MAF800-100SMULTI-CARRIERPOWERAMPLIFIERUSER MANUAL
Table Of ContentsPageSection 1 No.General Description ..............................................................................................................1Section 2Specifications........................................................................................................................2Section 3Multi-Carrier Power Amplifier Principals of Operation.......................................................3Principals of Operation .........................................................................................................4Principals of Operation .........................................................................................................5Principals of Operation…………………………………………………….6Section 4Operating Instructions...........................................................................................................7Operating Instructions………………………………………………………8Section 5Installation Instructions.........................................................................................................9Installation Instructions........................................................................................................10Installation Instructions........................................................................................................11 Section 6Maintenance.........................................................................................................................12Maintenance.........................................................................................................................13Maintenance.........................................................................................................................14Maintenance.........................................................................................................................15Maintenance.........................................................................................................................16Section 7 Troubleshooting……………………………………………………………17
1Section 1 Amplifier System Description1.1 IntroductionThis manual contains information and procedures for installation, operation, and maintenance of ParadigmWireless Systems MAF800-100S multi-carrier cellular amplifier. This manual is organized into thefollowing sections:Section 1. Amplifier System DescriptionSection 2. SpecificationsSection 3. Principals of OperationSection 4. Operating InstructionsSection 5. InstallationSection 6. MaintenanceSection 7. Troubleshooting1.2 General DescriptionThe MAF800-100S is a linear, feed forward power amplifier that operates in the 25 MHz frequency rangefrom 869 MHz to 894 MHz. The average output power of the amplifier is 100 Watts average AMPS,CDMA, CDMA 2000, 1xEV-DO, GSM, TDMA, and EDGE. The amplifier is designed to operate in amaximum of two continuous modulations or a total instantaneous bandwidth of 25 MHz. The amplifier cansimultaneously transmit multiple frequencies, with a better than –13 dBm third order intermodulationdistortion. The amplifier is designed and suited for use in CDMA, TDMA, EDGE and GSM radio basestations. A sub-rack is employed to combine the outputs of up to (4) MAF800-100S amplifiers. Each plug-in module operates in parallel to produce a high peak output power and fail safe redundancy for trouble freeoperation with minimum maintenance. A multi-color LED detects when a fault condition has occurredwithin the amplifier. The LED will turn from GREEN to RED during an amplifier fault condition.Each amplifier has a status connector that allows the host system to monitor the amplifier moduleperformance. Monitoring of the amplifiers is done through the D-subminiature connector on the back of theMAF800-100S amplifiers. The front panel of the MAF800-100S amplifier has an ON/OFF circuit breaker.Primary +27 Vdc power for the MAF 800-100S amplifiers is provided through the sub-rack assembly.The sub-rack contains the fan assembly for cooling each amplifier. Cooling fans are used to pull air throughthe heat sinks. Air movement across the heat sinks dissipates the heat generated by the amplifiers. Constantairflow ensures the amplifiers performance to specifications.Section 2 MAF800-100S Electrical SpecificationParameter SpecificationFrequency 869-894 MHzRF Gain 58 dBGain Variation over Temperature 0.3 dBGain Flatness 0.5 dBIntermodulation Distortion ≤ -13 dBm
2Out of Band Spurious ≤ -13 dBmInput Power -4 dBmOutput Power 100 WattsModulation Type AMPS, CDMA, CDMA 2000, TDMA, EDGE, GSM, 1xEV-DOOperating Instantaneous Bandwidth 25 MHzInput Return Loss ≥ 15 dBOutput Return Loss ≥ 15 dBOutput Protection Mismatched ProtectedDuty Cycle ContinuousVdc Input Power +27 VdcOperating Current 24 amps per amplifierMAF800-100S Environmental Specifications:Parameter SpecificationOperating Temperature 0° C. to 50° C.Storage Temperature -40° C. to + 80° C.Operating Humidity 5%- 95% Relative Humidity (Non-condensing)Storage Humidity 5%-95% Relative Humidity (Non-condensing)RF Input / Output Connector D-Sub, Hybrid, Plug-in Type RF Connector: PKZ26-0020 series straight plug (Phoenix Co.)Status / Alarm / Control / DC Input Connector 21 Pin D-Subminiature Combo ConnectorDimensionsWeightSection 3 Principals of Operation3.1 IntroductionThis section contains the functional description of the MAF800-100S multi-carrier power amplifier.3.2 RF Input SignalThe maximum composite input power shall not exceed – 4 dBm. The reference source signal shall notexceed the base station manufacture minimum requirements for intermodulation distortion. For proper loopbalance, the out of band components of the input signal shall not exceed –40 dBc. The input VSWR shouldbe 2:1 maximum3.3 RF Output LoadThe load impedance should be equal to or better than 1.5:1 in the operating band for good power transfer tothe load. If the amplifier is operated into a filter, it will maintain its distortion characteristics outside thesignal band even if the VSWR is infinite. Provided the reflected power does not exceed one-watt. Aparasitic signal of less than one-watt incident on the output will not cause distortion at a higher level thanthe normal forward distortion
33.4 Amplifier Functional DescriptionThe MAF800-100S amplifier is a linear, feed-forward power amplifier that operates in the 25 MHzfrequency band from 869 MHz -894 MHz. The amplifier is designed to operate in an instantaneousbandwidth of 25 MHz. Each amplifier is a self-contained plug in module and is functionally independent ofthe other amplifier module. The amplifier modules are designed for parallel operation to achieve high peakpower output, and for redundancy in unmanned remote locations. Each amplifier in the system cansimultaneously transmit multiple carrier frequencies, at an average total power output of 100 Watts, withbetter than –13 dBm intermodulation distortion.All phase and gain corrections are performed on the signal (s) in the individual amplifier module. Eachamplifier module has an alarm board that monitors the amplifier performance. If a failure or fault occurs inthe amplifier module a multi-color LED will change from GREEN to RED. This will be displayed on thefront of the individual amplifier front panel.3.5 MAF800-100S Amplifier ModuleThe amplifier module has an average output of 100 Watts power with intermodulation products suppressedto better than -13 dBm. The amplifier provides an amplified output signal with constant gain and phase byadding approximately 25 dB of distortion cancellation on the output signal. Continuously comparing activepaths with passive references, and correcting for small variations through RF feedback control maintainconstant gain and phase. The amplifier module is comprised of:PreamplifiersMain AmplifiersError AmplifierTwo feed-forward loops with phase–shift and gain controlsDC/DC power regulatorAlarm monitoring, control and LED display lamp
4MAF800-100S Block Diagram
5The main amplifier employs class AB amplification for maximum efficiency. The error amplifier and feedforward loops are employed to correct signal non-linearity introduced by the class AB main amplifier. Theerror amplifier operates in class AB mode. The RF input signals are amplified by a preamp and coupled toan attenuator and phase shifted by 180 degrees and amplified in the pre-main amplifier. The output fromthe pre-main amplifier is fed to the class AB main amplifier. The output from the main amplifier istypically 100 Watts.The signal output from the main amplifier is sampled using a coupler. The sample signal is combined withthe main input signal and input to the second feed-forward loop. The error signal is attenuated, phaseshifted 180 degrees, then passed to the error amplifier where it is amplified to a level identical to thesampled output from the main amplifier. The output from the error amplifier is then coupled back andadded to the output from the main amplifier. The control loops continuously make adjustments to cancelout any distortion in the final output signals.The primary function of the 1st loop is to provide an error signal for the 2nd loop. The primary function ofthe 2nd loop is to amplify the error signal to cancel out spurious products developed in the main amplifier.The input signal is amplified by a pre-amplifier and fed to a coupler and delay line. The signal from thecoupler is fed to the attenuator and phase shifter in the 1st loop. The 1st loop control section phase shifts themain input signals by 180 degrees and constantly monitors the output for correct phase and gain.The 2nd loop control section obtains a sample of the distortion added to the output signals by the mainamplifiers, and then phase shifts the signals by 180 degrees then feeds the signal to the error amplifier.There it is amplified to the same power level as the input sample and coupled on to the main output signal.The final output is monitored by the 2nd loop and adjusted to ensure that the signal distortion and IMD onthe final output is cancelled.3.6 Main AmplifierThe input and output of the amplifier employ two-stage, class AB amplifiers, which provide approximately25 dB of gain in the 25 MHz frequency band, from 869 MHz to 894 MHz. The amplifier operates on +27Vdc, and is mounted directly on a heat sink, which is temperature monitored by a thermal sensor. If theheat sink temperature exceeds 85° C. a high temperature fault occurs. The alarm logic controls thetransistor bias voltage; this shuts down the amplifier if bias voltage is out of range.
63.7 Error AmplifierThe primary function of the error amplifier is to sample and amplify the signal distortion level generated bythe main amplifier. The error amplifier cancels out the distortion and IMD when the error signal is coupledonto the main signal at the amplifier output. The matching signal levels from the error amplifier areinjected back into the main amplifier output reducing any distortion and cancellation of IMD. The erroramplifier is a balanced multistage class AB amplifier. It has 75 dB of gain, and produces up to 65 Wattoutput. The amplifier operates on +27 Vdc and is mounted directly on a heat sink.3.8 Amplifier Status MonitoringIn the main and error amplifier stages, all normal variations are automatically compensated for by the feed-forward loop control. When large variations occur beyond the adjustment range of the loop control, a loopfault will occur. The amplifier will be disabled, and the LED will be RED. The alarms will be sent via the21-pin connector on the rear of the module to the sub-rack summary alarm board.3.9 Amplifier Module CoolingEach amplifier module has its own heat sinks. All main amplifier components are mounted to the heat sink.Forced air-cooling is used to pull air across the heat sinks for operations in the sub-rack. The fans for thisforced air-cooling is located in the sub-rack assembly. The fans are mounted in the rear of the sub-rackassembly. Air is pulled from the front of the amplifier and exhausted out of the back of the rack.3.10 DC Power DistributionPrimary Vdc for the system is provided by the host system to the sub-rack assembly. The sub-rack suppliesthe +27 Vdc to the amplifier module. The +27 Vdc is supplied directly through the sub-rack powersplitter/combiner board. The amplifier module has a DC/DC converter that converts the +27 Vdc to +12Vdc, +5Vdc,Section 4 Operating Instructions4.1 IntroductionThis section contains operating instructions for the MAF800-100S Cellular Amplifier System.4.2 Function of Amplifier Module ControlsPrimary +27 Vdc power for the MAF800-100S amplifiers is applied via the 50-amp circuit breaker on thefront panel of the amplifier. A reset switch is located below the LED on the front panel. This switch resetsthe amplifier module in the event of a minor alarm. The front panel LED is a multi color LED that changesfrom GREEN in normal operation to RED during major or AMBER during minor alarms.
74.3 Alarm DefinitionALARM CATEGORY LED MCPAMODULE MCPADISABLESIGNALCONDITIONOver PWR Critical Red Disable High MCPA module output power> 150 WattsOver PWR Critical Red Disable High Input power > - 4 dBmHigh TEMP Minor Red Enable Low High temperature detectedHigh TEMP Critical Red Disable High High temperature detected for longerthan two minutesVSWR Minor Red Enable Low Reflected power detected at output >7.5WattsVSWR Critical Red Disable High Reflected power detected at output >26WattsDC Fail Minor Red Enable Low One of the internal DC voltagesdropped below or exceeded the safethreshold levelDC Fail Critical Red Disable High Voltage out of range for longer thanapproximately two minutes.DC Fail(OverVoltage)Minor Red Disable High +27 Vdc input >28 V detectedDC Fail(OverVoltage)Critical Red Disable High +27 Vdc input >28 V. for longer thanone second after initial detection ofVdc i nput >28 V.Loop Fail Minor Red Enabled Low Loop failure detectedLoop Fail Critical Red Disable High Loop failure detected longer than twominutes.
84.4 Initial Start-Up and Operating ProceduresTo perform initial start-up, proceed as follows:1. Carefully remove MAF800-100S MCPA series from the shipping carton2. Place MAF800-100S MCPA into the sub-rack assemblyCautionWhen placing MAF800-100S MCPA into sub-rack gently slide MCPA into matting connector. Damagecan occur to matting connector due to abrupt handling of the unit.NoteAll RF connections to the unit will be of 50 ohm. Any changes in impedance will cause severe mismatchand VSWR to occur. Do not operate the amplifier without a load attached to the output of the sub-rack.3. Connect all RF input and output cables to the sub-rack.4. Ensure that source RF power is un-keyed or turned off.5. Connect +27 Vdc power source to sub-rack6. Turn ON/OFF switch on the front panel to the ON position.7. Ensure sub-rack fans are working.8. Normalize amplifier for 1 minute in ON position. Monitor for alarms on front panel.9. Before turning on source RF power, verify RF level is set to minimum. High source input level candamage amplifier.10. Turn-on 1 channel from source power. Set power level.Note• If operating MAF800-100S MCPA without sub-rack, individual fans, RF attenuation, andD-Sub connector needs to be assembled for operation. Please contact your representative atParadigm Wireless Systems for information.• During initial operation of MAF800-100S components of the unit may drift. It isrecommended that a recheck of power levels be done after a 24 hr. period of operationSection 5 Installation Instructions5.1 IntroductionThis section contains unpacking, inspection, installation instructions and recommendations for theMAF800-100S MCPA. It is important that the user perform the following tasks correctly and in good faith.1. Carefully read all materials in this section prior to equipment unpacking or installation.2. Also read and review the operating instructions in Section 4 prior to installing the amplifier.
93. If applicable, carefully review the Federal Communications Commission (FCC) rules andregulation as they apply to your installation.5.2 Electrical Service RecommendationsParadigm Wireless Systems recommends that:• Proper AC line conditioning and surge suppression be provided on the primary AC input to the +27Vdc source.• All electrical service should be installed in accordance with the National Electrical Code, anyapplicable state or local codes, and good engineering practice.• Grounding of all equipment should be in accordance to Bellcore standards.• Circuit breakers should be thermal type, capable of handling the anticipated in rush current.5.3 Air ConditioningEach MAF800-100S MCPA will generate approximately 1900 BTU of heat. When using more than oneamplifier it is recommended that a thermal analysis be performed. Ensuring proper cooling will extend theMean Time Before Failure of the unit.5.3 Unpacking and InspectionThis equipment (as applicable) has been operated, tested, and calibrated at the factory. Carefully open andremove the MAF800-100S amplifier from the shipping container. Retain all packing material and shippingcontainer in the event that the unit must be returned to the factory. Please perform the following steps:
10CAUTIONExercise care in handling equipment during inspection to prevent damage caused by rough or carelesshandling.1. Visually inspect the MAF800-100S MCPA for damage that may have occurred during shipment.2. Check for evidence of water damage, bent or warped chassis, loose screws, nuts or extraneouspacking material in the connector(s).CAUTIONBefore applying power, make sure that all connectors to the MAF800-100S are secure. Make sure that theinput and output of the amplifier is terminated to 50 ohms. Do not operate the system without a loadattached. Excessive input power may damage the equipment.If possible, inspect the equipment in the presence of the delivery person.If the equipment is damaged:• The carrier is your first recourse.• A claim should be filed with the carrier once the extent of damage is assessed. Careful, immediateinspection is important if the carrier is suspect of damage.If the equipment is damaged and must be returned to the factory:• Contact your Paradigm Wireless Systems representative.• Paradigm Wireless Systems may not accept returns without an RMA.5.4 Installation InstructionsModel MAF800-100S MCPA is designed for use in a Cellular Radio Base Station. The host enclosure mustpermit access to the sub-rack for DC power, RF and alarm cables as well as proper ventilation of sub-rackthe assembly.WARNINGVerify that all circuit breakers on the MAF800-100S MCPA are in the OFF position before installation insub-rack. Turn OFF all external power to the sub-rack before installing MAF800-100S MCPA1. Install sub-rack into host radio base station and secure it into place using #10 32x1/2 Phillipsscrews and #10 flat washers.2. Connect +27 Vdc using #6 gauge wire. 1- Positive (red) 1- Return/Ground (black).3. Connect RF IN cable to sub-rack
114. Connect RF OUT cable to sub-rack.5. Connect external ALARM interface to external summary alarm board in host radio base station.6. Before installing the MAF800-100S MCPA into the sub-rack, inspect the 21-pin-D-sub comboconnector on the rear of each amplifier. Verify that all pins are straight, no pins are recessed, andthat the alignment shield is not bent.WARNINGDo not slam amplifiers into the sub-rack. Forcing the amplifier into the sub-rack at too fast a rate maycause pins on the 21-pin-D-sub connector of the amplifier to become recessed or broken.7. Continue installing MAF800-100S amplifiers into sub-rack.8. Apply +27 Vdc power to sub-rack. Measure with VOM +27 Vdc ± 1.0 Vdc. If the input voltage isabove or below the limits. Check DC power rectifier system.9. Verify cooling fans on sub-rack is operational.10. Refer to Section 4 for initial turn-on and checkout procedure.Section 6 Maintenance6.1 IntroductionThis section contains periodic maintenance and performance test procedures for Paradigm WirelessSystems MAF800-100S Multi-Carrier Power Amplifier.NOTECheck your sales order and equipment warranty before attempting to service or repair the unit. Do notbreak the seals on equipment under warranty or the warranty will be voided. Do not return equipment forwarranty or repair service until proper shipping instructions are received from the factory.6.2 Periodic MaintenancePeriodic maintenance is recommended. Table 6-1 lists the intervals at which the task should be performed.Table 6-1 Periodic MaintenanceTask Interval ActionInspectionCables and Connectors 3 months Inspect signal and power cables for frayedinsulation.
12Check RF connectors ensureconnectors are tightPerformance Tests 12 months Annual performance test as outlined inparagraph 6.4Clean Fans/Heat Sinks 3 months Inspect for debris. Remove dust with softcloth, brush or vacuum cleaner.6.3 Test Equipment Required for TestTest equipment required to test the amplifier is listed in table 6-2. Equivalent test equipment may besubstituted for any item. Use of a thermistor type power meter is recommended for optimum results.NOTEAll RF test equipment must be calibrated and within the calibration date. Any deviation from the nominalattenuation must be accounted for and factored into all output readings.
13Table 6-2 Test Equipment RequiredNomenclature Manufacturer ModelNetwork Analyzer Agilent 8753 ETSpectrum Analyzer Agilent 8560EPower Meter Agilent E4418BPower Meter/Sensor Agilent 437B / 8481ASignal Generator/ESG Agilent E4432BDirectional Coupler Agilent 778DAttenuator Weinschel Corp 53-30-34Attenuator Narda 766-206.4 Performance TestPerformance test should be performed every 12 months to ensure that the amplifier meets the operationalspecifications.NOTEThe frequencies used in this test are typically within the operating band of 869 MHz to 894 MHz. Selectevenly spaced F1, F2, F3, and F4 frequencies that cover the instantaneous bandwidth of your system.Figure 6-2
146.5 Amplifier Performance TestTo perform this test proceed as follows:Connect test equipment as shown in figure 6-2.WARNINGDO NOT APPLY ANY RF AT THIS TIME6.6 Amplifier Spurious Emission TestApply +27 Vdc from the power source. Apply 4 RF input signals (CDMA, TDMA, GSM, EDGE) equal tothe total composite operating output power. Setup Spectrum Analyzer for Center Frequency (UserDefined), Start Frequency (User Defined), Stop Frequency (User Defined MHz) Span (User Defined MHz)RES BW (100 kHz) Video BW (100 kHz) Measure IMD and record data on Table 6-3.6.7 Gain TestDisconnect spectrum analyzer from the MAF800-100S. Connect Network Analyzer to MCPA.Set Network Analyzer as follows:a. Normalize Network Analyzer for gain and return loss.b. Set start frequency to 860 MHz. Set stop frequency to 900 MHz. Setup Network Analyzer for 2-channel measurement. Set markers to user operating frequency band.c. Adjust input power of Network Analyzer to measure 50 watts on the Power Meter.d. Measure and record amplifier gain on Table 6-3.e. Measure Gain Flatness and record on table 6-3.f. With Network Analyzer setup for 2-channel operation measure return loss using S11 data Record on.Table 6-3.
15Table 6-3 MAF800-100S MCPA Test Data SheetDate_________________________Module S/N___________________TEST CONDITIONS:Load and Source Impedance: 50 OhmsVSWR: < 1.2:1Supply Voltage: +27 VdcTemperature: Room TemperatureTEST SPECIFICATION MIN MAX DATASpurious Emission Voltage = +27 VdcP()out =-57 dBcRF Gain Voltage = +27 VdcP()out =57 dBGain Flatness Voltage = +27 VdcP()out =±0.5 dBInput Return Loss Voltage = +27 VdcP()out =-15 dBPASS FAIL Tested By: _____________________
166.1 Field Replacement of the MAF800-100SThe MAF800-100S MCPA can be replaced in the field on the site by a qualified technician with experiencemaintaining RF power amplifiers and radio equipment.To replace a power amplifier module, proceed as follows:1. Set ON/OFF switch on front of amplifier to OFF position.2. Loosen the thumbscrews that secure the amplifier to the sub-rack.3. Slide amplifier out of sub-rack.CAUTIONWhen removing amplifier from the sub-rack, it is important to support the amplifiersuch that the rear of the module does not suddenly drop when the guide raildisengages from the rack. A drop such as this could damage the rear of the 21-pin-D-sub connector. 4. Replacement of module is done in the reverse order of removal steps 1-3.
17Section 7 Troubleshooting Shooting7.1 IntroductionThis section contains a list of problems that may occur. Paradigm Wireless Systems has suggestedcorrective action that may correct the problem. If the suggested corrective action does not eliminate theproblem, please contact your Paradigm Wireless Systems representative for further instructions.NOTECheck your sales order and equipment warranty before attempting to service or repair the unit. Do notbreak seals on equipment under warranty or the warranty will be voided. Do not return equipment forwarranty or repair service until proper shipping instructions are received from the factory.7.2 TroubleshootingRefer to Table 7-1 for troubleshooting suggestions:Symptom Suggested ActionInoperative 1.Check for proper power supply voltage.2.Verify all RF connections.3.Contact your Paradigm Wireless Systems representative.Over Heating Shut Down 1.Check for operation of fans on sub-rack assembly.2.Check for debris in heat sink3.Check air conditioning/venting unit for proper operation.4.Contact your Paradigm Wireless Systems representative.Over Power Shut Down 1.Verify host system radio output power level.2.Verify sub-rack input attenuation.3.Contact your Paradigm Wireless Systems representative.7.3 Return for Service ProceduresWhen returning products to Paradigm Wireless Systems, Inc. the following procedures will ensureresponse.7.3.1 Obtaining an RMA (Return Material Authorization)An RMA number must be obtained prior to returning equipment to the factory forservice. Please contact your Paradigm Wireless Systems representative to obtain thisnumber. Failure to obtain this number may result in delays in receiving repair service.7.3.2 Repackaging for ShipmentTo ensure safe shipment of the amplifier, it is recommended that the packaged designed for the amplifier isused. The original packaging material is reusable.

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