Powerwave Technologies 5JS0058 Multi-Carrier Power Amplifier User Manual I GENERAL DESCRIPTION

Powerwave Technologies Inc Multi-Carrier Power Amplifier I GENERAL DESCRIPTION

User Manual

869-894 MHz Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A April 2002Multi-Carrier Power Amplifier869 – 894 MHzG3S-800-180-29Installation & Service Manual180 Watts Average Power (210 W Max.)-60 dBc Intermodulation Distortion
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A ii April 2002April 2002Powerwave Technologies, Inc. Tel: (714) 466-10001801 East St. Andrew Place (888) 797-9283Santa Ana, CA 92705 Fax: (714) 466-5800Web Site: www.powerwave.com© 2002 Powerwave Technologies Incorporated. All rights reserved.Powerwave Technologies, and the Powerwave logo are registered trademarksPowerwave Technologies, Inc. reserves the right to make changes to the documentation andequipment, including but not limited to component substitution and circuitry changes. Changesthat impact this manual may subsequently be incorporated in a later revision of this manual.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A iii April 2002Table Of ContentsPar. Section 1 PageNo. General Description No.1-1 Introduction..........................................................................................................................................................1-11-2 General Description..........................................................................................................................................1-11-3 Functional And Physical Specifications.......................................................................................................1-11-4 Equipment Changes............................................................................................................................................1-11-5 Ordering Information.......................................................................................................................................... 1-2Section 2Installation2-1 Introduction..........................................................................................................................................................2-12-2 Electrical Service Recommendations............................................................................................................ 2-12-3 Air Conditioning..................................................................................................................................................2-22-4 Unpacking and Inspection................................................................................................................................ 2-22-5 Installation Instructions....................................................................................................................................2-32-6 Amplifier Module Connectors.......................................................................................................................... 2-42-6.1 Amplifier Module Status, Alarm, Control, and Power Connector............................................................ 2-42-6.2 Amplifier Module RF Connector...................................................................................................................... 2-5Section 3Operating Instructions3-1 Introduction..........................................................................................................................................................3-13-2 Location and Function of Amplifier Module Controls and Indicators..................................................... 3-13-2.1 Voltage Indicators and On/Off /Reset Switch............................................................................................... 3-13-2.1.1 On Off Switch.......................................................................................................................................................3-13-2.1.2 RF On Switch.......................................................................................................................................................3-13-2.1.3 +27VDC Indicator................................................................................................................................................3-23-2.1.4 +15VDC Indicator................................................................................................................................................3-23-2.1.5 +5VDC Indicator..................................................................................................................................................3-23-2.1.6 -5VDC Indicator................................................................................................................................................... 3-23-2.2 Alarm Indicators.................................................................................................................................................3-23-3 Initial Start-Up and Operating Procedures...................................................................................................3-4Section 4Principles of Operation4-1 Introduction..........................................................................................................................................................4-14-2 RF Input Signal ....................................................................................................................................................4-14-3 RF Output Load..................................................................................................................................................... 4-14-4 G3S-800-180-029 Amplifier Module................................................................................................................4-14-4.1 Main Amplifier.................................................................................................................................................... 4-24-4.2 Error Amplifier.....................................................................................................................................................4-24-4.3 Amplifier Monitoring.........................................................................................................................................4-24-4.4 Amplifier Module Cooling ................................................................................................................................4-34-5 Power Distribution.............................................................................................................................................4-34-6 Intermodulation...................................................................................................................................................4-34-7 Alarms...................................................................................................................................................................4-3
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A iv April 2002Section 5Maintenance5-1 Introduction..........................................................................................................................................................5-15-2 Periodic Maintenance....................................................................................................................................... 5-15-3 Test Equipment Required For Test..................................................................................................................5-15-4 Clean Air Inlets/Outlets.....................................................................................................................................5-25-5 Performance Test ...............................................................................................................................................5-25-5.1 Amplifier System Performance Test...............................................................................................................5-25-5.1.1 Amplifier IMD Test..............................................................................................................................................5.35-5.1.2 Gain Test...............................................................................................................................................................5-35-5.1.3 Harmonic Test..................................................................................................................................................... 5-35-5.1.4 Spurious Emissions Test................................................................................................................................... 5-45-5.1.5 Input Return Loss................................................................................................................................................5-45-6 Field Replacement Parts and Modules.......................................................................................................... 5-55-6.1 G3S-800-180-029 Power Amplifier Module...................................................................................................5-55-6.2 Cooling Fans ........................................................................................................................................................5-6Section 6Troubleshooting6-1 Introduction.......................................................................................................................................................... 6-16-2 Troubleshooting.................................................................................................................................................. 6-16-2.1 DC Voltage Indicators Not Illuminated..........................................................................................................6-16-2.2 OVER PWR Illuminated or Blinking................................................................................................................6-16-2.3 HIGH TEMP Illuminated ....................................................................................................................................6-26-2.4 VSWR Illuminated..............................................................................................................................................6-26-2.5 DC FAIL Illuminated............................................................................................................................................ 6-36-2.6 FAN FAIL Illuminated.........................................................................................................................................6-36-2.7 LOOP FAIL Illuminated....................................................................................................................................... 6-36-2.8 LOW PWR Illuminated....................................................................................................................................... 6-36-2.9 LPA DISABLE Illumunated................................................................................................................................ 6-36-3 Return for Service Procedures ........................................................................................................................6-46-3.1 Obtaining an RMA ..............................................................................................................................................6-46-3.2 Repackaging for Shipment...............................................................................................................................6-4List of IllustrationsFigureNo.1-1 G3S-800-180-029 Front and Side View...........................................................................................................1-32-1 G3S-800-180-029 Rear View.............................................................................................................................2-42-2 DC and Logic Connector.................................................................................................................................... 2-42-3 Amplifier RF Connector.....................................................................................................................................2-53-1 G3S-800-180-029 Amplifier Module RF Control Indicators........................................................................3-14-1 G3S-800-180-029 Power Amplifier Module Functional Block Diagram ................................................. 4-25-1 Amplifier System Test Setup Diagram........................................................................................................... 5-35-2 Amplifier Spring Clip Location........................................................................................................................ 5-5
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A vApril 2002List Of TablesTableNo.1-1 Major Amplifier Components...........................................................................................................................1-21-2 G3S-800-180-029 MCPA Functional Specifications ....................................................................................1-22-1 Sample of DC Cable Ratings.............................................................................................................................2-12-2 Averaged DC Current Load ...............................................................................................................................2-22-3 Averaged Heat Loading..................................................................................................................................... 2-32-4 Amplifier Module DC and Logic Connector Definition............................................................................... 2-52-5 Amplifier RF Connector Definition..................................................................................................................2-43-2 Amplifier Module Alarm Indicators Definition............................................................................................3-35-1 Periodic Maintenance....................................................................................................................................... 5-15-2 Test Equipment Required.................................................................................................................................. 5-25-3 MCPA Test Data Sheet......................................................................................................................................5-5
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reservedAll specifications are subject to change without notice. Contact the factory for complete performance data.044-05112 Rev. A 1-1 April 2002Section 1 General Description1-1 IntroductionThis manual contains information and procedures for installation, operation, and maintenance ofPowerwave’s G3S-800-180-029 multicarrier cellular amplifier. The manual is organized into sixsections as follows:Section 1. General DescriptionSection 2. InstallationSection 3. Operating InstructionsSection 4. Principles of OperationSection 5. MaintenanceSection 6. Troubleshooting1-2 General DescriptionThe G3S-800-180-029 (see figure 1-1) is a linear, feed-forward power amplifier that operates inthe 25 MHz frequency band from 869 MHz to 894 MHz. The amplifier can simultaneously transmitmultiple frequencies, with better than -60 dBc third order intermodulation distortion (IMD). It is de-signed for use in an amplifier system that is modular in design, and is ideally suited for use inAMPS/TDMA/CDMA/CDPD/W-CDMA base stations. The plug-in Model G3S-800-180-029 ampli-fier modules can each provide 180 watts of power nominally (210 W max.) and function com-pletely independently of each other. The amplifier modules are designed for parallel operation toproduce high peak power output and system redundancy for remote applications, when installedin multi-module amplifier subracks manufactured by Powerwave. All solid-state, the system is de-signed to provide trouble-free operation with minimum maintenance. The system's modular con-struction and unique and highly effective LED-based operational status and fault indicators helpminimize downtime. The turn-on and turn-off sequences of voltages are fully automatic, as isoverload protection and recycling. Inadvertent operator damage from front panel manipulation isvirtually impossible.The amplifier module has a status connector that allows the host system to monitor the amplifiermodule’s status. The front panel of each amplifier module has unit level status/fault indicators andan RF on/off/reset switch. Primary power for the amplifier is +27 Vdc. Cooling for each plug-inamplifier module is provided by four fans, two mounted on the front and two on the rear of themodule. The fans draw outside air through the front of the module and exhaust hot air outthrough the rear of the module.1-3 Functional And Physical SpecificationsFunctional and physical specifications for the amplifier are listed in table 1-2.1-4 Equipment ChangesPowerwave Technologies, Inc. reserves the right to make minor changes to the equipment, in-cluding but not necessarily limited to component substitution and circuitry changes. Changes thatimpact this manual may subsequently be incorporated in a later revision of this manual.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reservedAll specifications are subject to change without notice. Contact the factory for complete performance data.044-05112 Rev. A 1-2 April 20021-5 Ordering InformationTable 1-1 following gives the part numbers and descriptions to be used when ordering either anentire amplifier or replacement fans.Table 1-1 Major Amplifier ComponentsModel Number DescriptionG3S-800-180-029 180 W 869-894 MHz MCPA Module800-01075-003 Front fan assembly800-00972-002 Rear fan assembly.Table 1-2 G3S-800-180-029 Multicarrier Cellular Amplifier Functional SpecificationsFrequency Range 869-894 MHz (25 MHz Bandwidth)Instantaneous Bandwidth 25 MHzTotal Typical / Maximum Input Power -5.44 / -5.0 dBmTotal Output Power 180 W (52.55 dBm) Nominal, 210 W (53.22 dBm) Max.(1 Module)IMD and In-band Spurious, meanmeasurement, 30 KHz bandwidth@+26 to +28Vdc, 25°C-60 dBc or -16 dBm max @ up to 16 equal power CWtones with a combined maximum power of P0 with amax single carrier power of P0/16.Out of Band Spurious & Noise,measured in 30 KHz BW -60 dBc max @ +26 to +28 VdcRF Gain 58 dB +0.5 dBGain Flatness: ±0.5 dB @ 27 Vdc ±1 VdcGain Variation w/ Voltage andFrequency + 0.5 dB; 26 to 28 VdcGain Variation Over Temperature: ±0.5 dBNoise Figure 28 dB maxOutput Protection: Mismatch ProtectedInput Port Return Loss: 16 dB minHarmonics: Better than -50 dBcOut of Band Spurious: Better than -60 dBcDuty Cycle: ContinuousDC Input Power: +27 Vdc ±1 Vdc, 62 amps typical (70 amps max)Operational +21.7 Vdc to 30 Vdc (Po derated outsidenormal operating range)DC Circuit Breaker Rating 100 AmpsOperating Temperature: 0 ºC to +40 ºCStorage Temperature: -40 ºC to +85 ºCOperating Humidity: 0 % to 80 % Relative Humidity (noncondensing)Storage Humidity: 0 % to 100 % Relative Humidity (noncondensing)DC Input, Summary Alarm, and RFInput / Output Connectors: 21-Pin D-Subminiature Combo Connector plus single-pin D-Sub connector for additional DC capability.Heat Generation 4852 BTUs @ 26 VDC, Po = 180 W (1 Amplifier)Weight 50 lbs.Dimensions: 5.20” High, 17.00” Wide, 20.00” DeepElectrical Service Recommendations Circuit Breakers Capable of handling anticipated inrush current (nor-mally 25% over equipment maximum current draw), ina load center with a master switch.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reservedAll specifications are subject to change without notice. Contact the factory for complete performance data.044-05112 Rev. A 1-3 April 2002Figure 1-1 G3S-800-180-029
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 2-1 April 2002Section 2 Installation2-1 IntroductionThis section contains installation recommendations, unpacking, inspection, and installation in-structions for the Multicarrier Cellular Amplifier. Carefully read all material in this section prior toequipment unpacking or installation. Also read and review the operating procedures in Section 3prior to installing the equipment. It is important that the licensee perform these tasks correctly andin good faith. If applicable, carefully review the Federal Communications Commission (FCC) rulesas they apply to your installation. 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 +27 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. The elec-trical 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 capable of handling the anticipated inrush current, ina load center with a master switch. Powerwave recommends that a 100 amp circuit breaker beinstalled in the power distribution unit for each amplifier. DC wire smaller than 2 AWG 90°C cop-per DC should not be installed. Each amplifier should have its own DC cable pair. See table 2-1.CAUTIONThis table and the foregoing are provided as guidelines. Follow the appropriate NECstandards in your area and the cable manufacturer’s recommendation for proper cableselection.Table 2-1 Sample of DC Cable RatingsAWG Copper Aluminumor 3 Cond. In Raceway Single Conductor In Free Air 3 Cond. In Raceway Single Conductor In Free AirMCM 90°C 110°C90°C 110°C 125°C 200°C90°C 110°C90°C 110°C 125°C 200°C14 25 30 30 40 40 45 -- -- -- -- -- --12 30 35 40 50 50 55 25 25 30 40 40 4510 40 45 55 65 70 75 30 35 45 50 55 608 55 60 75 85 90 100 40 45 55 65 70 806 70 80 100 120 125 135 55 60 80 95 100 1054 95 105 135 160 170 180 75 80 105 125 135 1402 125 135 185 210 225 240 100 105 140 165 175 1851 145 160 215 245 265 280 110 125 165 190 205 2200 165 190 250 285 305 325 130 150 190 220 240 255Based on ambient temperature of 30°C (86°F) 100% Load FactorSource: Industrial Electric Wire & Cable Inc., Technical Guide Vol. 4M 11/99, Table III Suggested Ampacities - All Typesof Insulations; Based on National Electric Code
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 2-2 April 2002According to the laws of probability used to formulate Erlang tables, rarely are all channels trans-mitting at the same time. We can use Erlang tables to predict typical maximum current usage.Table 2-2 describes the current load for a 3 sector (70%), 2 sector (80%) and omni (90%) site.Based on this table, an 800 amp power plant may suffice.Battery backup or UPS systems should be installed in remote sites or in sites which experiencebrownout conditions or generator switchovers. Adding this equipment should eliminate the needfor site visits by technicians after brownouts or power outages. Battery backup systems also pro-vide excellent DC filtering as a side benefit.Table 2-2 Averaged DC Current Load (Amperes)(typical, based on % of output power)AmplifierPower No. OfAmplifiers 3 Sector (70%)Averaged Current 2 Sector (80%)Averaged Current 1 Sector (90%)Averaged Current 100%Typical180 9 484 554180 6 323 334 370180 3 161 167 176 185180 1 54 56 59 622-3 Air ConditioningEach G3S-800-180-029 amplifier generates 4852 BTUs of heat at full power. A fully populatedMCR30829-1-3 subrack operating at full power will generate 14,556 BTUs of heat. A full three-sector site employing three fully populated MCR30829-1-3 subracks will generate 52,510 BTUs ofheat at full power (500W per subrack, 70A, 27VDC). A five-ton air conditioner is needed to coolthis Powerwave equipment. A full three-sector site probably needs at least a five-ton air condi-tioner to cool all of the site's equipment, based on heat load averaging as described in table 2-2.In keeping with section 2-3, table 2-3 describes the heat load for a 3 sector (70%), 2 sector (80%)and omni (90%) site. Perform a site survey to determine actual air conditioning needs.Table 2-3 Averaged Heat Loading (British Thermal Units/hr)(typical, based on % of output power)AmplifierPower No. OfAmplifiers 3 Sector (70%)Averaged BTU's 2 Sector (80%)Averaged BTU's 1 Sector (90%)Averaged BTU's 100%Typical180 9 38,973 43,666180 6 25,982 26,735 29,111180 3 12,991 13,368 13,961 14,555180 1 4,330 4,456 4,654 48522-4 Unpacking And InspectionThis equipment has been operated, tested and calibrated at the factory. Only in the event of se-vere shocks or other mistreatment should any substantial readjustment be required. Carefullyopen the container(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 equipment during inspection to prevent damage caused byrough or careless handling.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 2-3 April 2002Visually 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 or fans. Inspect the rear panel connector for bent connectorpins. If the equipment is damaged, a claim should be filed with the carrier once the extent of anydamage is assessed. We cannot stress too strongly the importance of IMMEDIATE careful in-spection of the equipment and the subsequent IMMEDIATE filing of the necessary claims againstthe carrier if necessary. If possible, inspect the equipment in the presence of the delivery person.If the equipment is damaged, the carrier is your first area of recourse. If the equipment is dam-aged and must be returned to the factory, write or phone for a return authorization. Powerwavemay not accept returns without a return authorization. Claims for loss or damage may not bewithheld from any payment to Powerwave, nor may any payment due be withheld pending theoutcome thereof. WE CANNOT GUARANTEE THE FREIGHT CARRIER'S PERFORMANCE.2-5 Installation Instructions (refer to figures 1-1 and 2-1)The G3S-800-180-029 amplifier module is designed for installation in a subrack for connection ofDC power, RF, and monitor cables.To install the amplifier proceed as follows:1. Install the subrack in an equipment rack and secure in place, based on the installation in-structions from the appropriate manual for the subrack being installed.2. Connect the subrack RF output to a high quality transmit filter. Powerwave recommends thata 800W average power / 14KW instantaneous peak power rated filter be used in most appli-cations.3. Connect the combined transceiver output(s) to the RF Input port of subrack.4. Connect the alarm cable(s) to the alarm port of subrack.WARNINGVerify that all circuit breaker switches on the power distribution panel are in the OFFposition. Turn off external primary DC power before connecting DC power cables.5. Connect positive primary power and negative primary power to the subrack. Tighten thesubrack power connections.6. Verify that the plug-in amplifier’s front panel On/Off switch is in the Off position.7. Inspect the 21-pin D-Sub male combo connector on the rear of each amplifier before install-ing the amplifier in the amplifier subrack. Verify that all pins are straight, no pins are re-cessed, that the alignment shield is not bent, and no packing material is embedded in theconnector.CAUTIONForcing the amplifier into the subrack at too fast a rate may cause the pins on the 21-pinD-sub connector of the amplifier to become recessed or broken.8. Install the plug-in amplifier module(s) in the subrack. Tighten left and right thumbscrews untilfinger tight. Tighten the thumbscrews with a slotted screw driver about 1/8 of a turn past fin-ger tight.9. Check your work before applying DC voltage to the system. Make certain all connections aretight and correct.10. Turn the power distribution circuit breakers back on.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 2-4 April 200211. Measure primary DC input voltage. DC input voltage should be +27 Vdc ±1.0 Vdc. If the DCinput voltage is above or below the limits, call and consult Powerwave before you turn onyour amplifier system.12. Refer to section 3 for initial turn-on and checkout procedures.2-6 Amplifier Module ConnectorsThe amplifier has three connectors on the right rear of the module. The larger is a 21-pin maleD-Sub combo, which provides the status, alarm, control, and power connections. The smallerBMA coaxial female connectors provide the RF connections. Refer to figure 2-1.Figure 2-1 G3S-800-180-029 Amplifier, Rear View2-6.1 Amplifier Module Status, Alarm, Control, And Power ConnectorThe amplifier has a separate remote alarm and control connector, which may be used by the hostsystem to monitor and control the individual amplifier modules. The status, alarm, control, andpower connections on the amplifier connector are made through a 21-pin male D-Sub comboconnector (figure 2-2) and are listed and described in table 2-4.A1 A2 A3 A41 2 3 4 5 6 7 8 910 11 12 13 14 15 16 17Figure 2-2 DC and Logic Connector (on Rear of G3S-800-180-029 Amplifier Module)
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 2-5 April 2002Table 2-4 Amplifier Module DC and Logic Connector DefinitionPin Function DescriptionA1 Power Input +27 Vdc (Power Contact)A2 Power Input +27 Vdc (Power Contact)A3 Ground Ground (Power Contact)A4 Ground Ground (Power Contact)1 RS485 +TxD Serial Communication Data Out2 RS485 +RxD Serial Communication Data In3 Service Loop TTL input to Amp. Gnd. for special test mode (Note 1)4 MCPA Disabled(Summary Fault) TTL signal normally low indicates MCPA enabled. A high level indi-cates that the MCPA has been disabled. Over Power, Over Voltagetakes one second to activate the signal.5 Mod Addr 0 TTL input to Amp. Gnd. supplied by shelf to identify slot.6 Mod Addr 1 TTL input to Amp. Gnd. supplied by shelf to identify slot.7 TP1 TTL output. Future test point.8 Manual Download GND to download manually9 DC on stat TTL output. High indicates Amp is powered on.10 RS485 –TxD Serial Communication Data Out11 RS485 –RxD Serial Communication Data In12 SCL7 No connection13 SDA7 No connection14 FP Disable Output Output, GND if the front panel switch is in the OFF position; +5 voltsindicates the front panel switch is in the ON position.15 FP RST Output, GND if the front panel switch is in the RESET position; +5 voltsotherwise.16 GND Ground17 Module Detect Ground potential. Informs the subrack that an MCPA is plugged in.Note 1: Service loop grounded allows the MCPA to be enabled or disabled by the front panelswitch when not mounted in the shelf.2-6.2 Amplifier Module RF ConnectorThe amplifier has separate RF connectors, which are used for the RF signal input and output.The RF connections on the amplifier connector are made through two BMA female coaxial con-nectors (figure 2-3) and are listed and described in table 2-5.Figure 2-3 Amplifier RF ConnectorTable 2-5 Amplifier RF Connector DefinitionPin Function DescriptionA1 RF Input BMA Coaxial Female, RadiallA2 RF Output BMA Coaxial Female, RadiallA1 A2
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 3-1 April 2002Section 3 Operating Instructions3-1 IntroductionThis section contains operating instructions for the Multicarrier Cellular Amplifier System.3-2 Location And Function Of Amplifier Module Controls And IndicatorsPrimary +27 Vdc power is applied to the amplifier via a 100-amp circuit breaker (ON-OFF) locatedon the left side of the amplifier front panel.The plug-in amplifier module RF control and indicators, located in the center of the amplifier frontpanel between the cooling fans, are shown in figure 3-1. The status and RF control functions andalarms are described in detail in the subsequent paragraphs.Figure 3-1 G3S-800-180-029 Amplifier Module RF Control and Indicators3-2.1 Voltage Indicators And On/Off/Reset Switch3-2.1.1 On Off SwitchThis is the DC power switch for the amplifier module. The On/Off switch is a circuit breaker ratedfor the inrush current and maximum current draw allowable with this amplifier module. This switchshould be in the Off position whenever the amplifier is inserted or removed from an amplifiersubrack.3-2.1.2 RF ON SwitchThree position switch:Off (down position) - Turns off RF section of amplifier module.On (center position) - Normal amplifier on position.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 3-2 April 2002Reset (up position) - When toggled to reset position, all the red LED indicators will turn onone at a time in sequence followed by all the green indicators one at a time in sequence; thiswill also reset the fault latches. If the switch is held in the reset position, a microcontroller re-set will occur. This will be verified by the LEDs toggling state again. The switch is springloaded to return to the normal ON position when released. If a fault occurs and the MCPA isdisabled, the alarms can be cleared and the MCPA enabled by this reset position. The func-tions of the switch are disabled for five seconds after a power-up condition.3-2.1.3 +27VDC IndicatorGreen LED. When lit, indicates that the +27 Vdc supply is greater than +21 Vdc and less than+31 Vdc. If the +27 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicatesthat the +27 Vdc voltage dropped below +21 Vdc.3-2.1.4 +15VDC IndicatorGreen LED. When lit, indicates that the +15 Vdc supply is greater than +12 Vdc and less than+17 Vdc. If the +15 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicatesthat the +15 Vdc voltage dropped below +12 Vdc or increased above +17 Vdc.3-2.1.5 +5VDC IndicatorGreen LED. When lit, indicates that the +5 Vdc supply is greater than +2 Vdc and less than +7Vdc. If the +5 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicates that the+5 Vdc voltage dropped below +2 Vdc or increased above +7 Vdc.3-2.1.6 -5VDC IndicatorGreen LED. When lit, indicates that the -5 Vdc supply is greater than -7 Vdc and less than -2 Vdc.If the -5 Vdc indicator goes out, the DC FAIL indicator will illuminate. This indicates that the -5Vdc voltage dropped below -7 Vdc or increased above -2 Vdc.3-2.2 Alarm IndicatorsThe alarm modes described here are indicative of amplifier alarm modes made to the amplifiersubrack. The amplifier subrack interprets these alarms and may subsequently deliver a differentalarm indication to the host equipment. Refer to the amplifier subrack manual to determine hostequipment level alarms.Refer to section 6 to interpret and correct the various alarm states.Refer to table 3-1.A ‘Minor Alarm’ indicates a potential fatal amplifier problem via the amplifier front panel LEDs. andthe MCPA fault will be in evaluation.A ‘Major Alarm’ indicates a major problem but the MCPA module will not be disabled.A ‘Critical Alarm’ is indicative of a fatal problem. The fault indicator will latch on and the MCPAmodule will be disabled.Both ‘Major Alarm’ and ‘Critical Alarm’ will be sent to the host system via the MCPA subrack.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 3-3 April 2002Table 3-1 Amplifier Module Alarm Indicators DefinitionAlarm Mode LED MCPAModuleMCPADisable signal(pin 4 inTable 2-1) ConditionOver Pwr Critical Red Disable High MCPA module output power >220watts (Note 4)Over Pwr Critical Red Disable High Input power >-3 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 14.5 W < Reflected Power < 38WVSWR Critical Red Disable High 60W < Reflected power detected atoutput longer than approx. two min.DC 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 thanapprox. two minutes (Note 2)DC Fail(Overvoltage) Critical Red Disable High +27 Vdc input >30 V for longer thanone sec. after initial detection of DCinput >31 V (Note 3)Fan Fail(one) Major Red Enable Low Any fan failureLoop Fail Minor Red Enable Low Loop failure detectedLoop Fail Critical Red Disable High Loop failure detected longer than 2minutesLow Pwr Minor Red Enable Low Rack controller detected MCPA out-put is 3 dB below that of the otherMCPA in the system.Low Pwr Critical Red Disable High Rack controller detected low powercondition for more than approx. twominutesLPADISAB. Critical Red Disable HighUnit is manually switched off usingthe front panel RF ON switch, or dis-abled by a serial command or autoshutdown by an alarm condition.NOTES:1. RS-485 serial alarm will follow LED status.2. The appropriate status LED shall turn off indicating which voltage is out of its range.3. When overvoltage is detected:a) MCPA shall shut down (disable)b) Turn on red DC Fail LEDc) Set flag for DC Fail alarm4. When overpower is detected:a) MCPA shall shut down (disable)b) Turn on Over Pwr LEDc) Set flag for Over Pwr alarmd) The MCPA module uses an RMS power detector to determine the overpower fault.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 3-4 April 20023-3 Initial Start-Up And Operating ProceduresThe amplifier module has two operating controls, both located on the front face of the module: thepower ON - OFF switch and the RF ON - ON/OFF/RESET switch (refer to figures 1-1 and 3-1).To perform the initial start-up, proceed as follows:1. Verify that all input and output cables are properly connected.CAUTIONBefore applying power, make sure that the input and output of the amplifier areproperly terminated at 50 ohms. Do not operate the amplifier without a load attached.Refer to table 1-2 for input power requirements. Excessive input power may damagethe amplifierWARNINGEnsure the amplifier is turned off while disconnecting and reconnecting cablesbetween the antenna interface and power measurement equipment. Failure to do somay cause damage to the equipment or personal injury.NOTEThe output coaxial cable between the amplifier and the antenna must be 50 ohm coaxialcable. Use of any other cable will distort the output.2. Verify that the amplifier front panel switches are in the OFF position.3. Turn on supply that provides +27 Vdc to the amplifier system. Do not apply an RF signal tothe amplifier system4. Place the ON - OFF circuit breaker on the amplifier in the ON position. Visually check theindicators on the amplifier module, and verify that the following indicators are on:A. LPA DISAB. indicator (red) should be on.B. The +27VDC, +15VDC, +5VDC and -5VDC indicators (green) on the amplifier moduleshould be on.5. Set the RF ON switch to the ON (center) position. All red LEDs should turn off after six sec-onds.6. Follow the power setting procedure set forth in the amplifier subrack or system integrationmanual. Turn on external exciter/transceiver and apply RF input signals.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 4-1 April 2002Section 4 Principles of Operation4-1 IntroductionThis section contains a functional description of the Multicarrier Cellular Amplifier.4-2 RF Input SignalThis amplifier may be installed in a base station system as either a stand-alone module (i.e. in amicro-cell application), or combined with multiple amplifiers in a combining subrack product avail-able from Powerwave. In either case, the maximum input power for all carrier frequencies shouldnot exceed the limits specified in table 1-2. For proper amplifier loop balance and to ensure com-pliance with FCC rules, the out of band components of the input signals should not exceed -40dBc. The input VSWR presented to the amplifier should be 2:1 (or better) to maximize the transferof input power to the amplifier; this is particularly important when the amplifier is not installed in aPowerwave manufactured combining subrack.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. If the amplifier is operated into a filter, it will maintain its distortioncharacteristics outside the signal band.4-4 G3S-800-180-029 Amplifier ModuleThe G3S-800-180-029 amplifier is a linear, feed-forward power amplifier that operates in the 25MHz frequency band from 869 MHz to 894 MHz. The amplifier modules are designed for paralleloperation to achieve high peak power output, and provide system redundancy when installed inmulti-module amplifier subracks manufactured by Powerwave. The Powerwave amplifier systemis ideally suited for unmanned remote locations.The amplifier module, figure 4-1, has an average output of 180 watts nominal power (1800 wattspeak power) with intermodulation products suppressed to better than -60 dBc below carrier levels.The amplifier provides an amplified output signal with constant gain and phase. Constant gain andphase is maintained by continuously comparing active paths with passive references, and cor-recting for small variations through the RF feedback controls. All gain and phase variations, forexample those due to temperature, are reduced to the passive reference variations. Each ampli-fier module has an alarm and display board that monitors the amplifier performance. If a failure orfault occurs in an amplifier module, it is displayed on the individual amplifier front panel.The amplifier module is comprised of:PredistorterPre-amplifiersMain amplifierError amplifierTwo feed-forward loops with phase-shift and gain controlsDC/DC power regulatorAlarm monitoring, control and display panelThe main amplifier employs class AB amplification for maximum efficiency. The error amplifierand feed forward loops are employed to correct signal nonlinearities introduced by the class ABmain amplifier. The error amplifier operates in class AB mode. The RF input signals are ampli-
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 4-2 April 2002fied by a preamp and coupled to an attenuator and phase shifter in the first feed-forward loop.The main signal is phase shifted by 180 degrees and amplified in the premain amplifier. The out-put from the premain amplifier is fed to the class AB main amplifier. The output from the mainamplifier is typically 220 watts. The signal is output to several couplers and a delay structure.The signal output from the main amplifier is sampled using a coupler, and the sample signal iscombined with the main input signal and input to the second feed-forward loop. The error signal isattenuated, phase shifted 180 degrees, then fed to the error amplifier where it is amplified to alevel identical to the sampled output from the main amplifier. The output from the error amplifieris then coupled back and added to the output from the main amplifier. The control loops continu-ously make adjustments to cancel out any distortion in the final output signals.PreAmpPreMain MainAmpErrorAmpDelayFeed Forward Loop control2nd LoopPhase & Gain1st LoopPhase & Gain DelayAlarms & Display+15 +5 -5Power Supply-30dB -10dBRF OutRFLPWRFWDPWRFront PanelSmart Rack+27VDCPreDistFigure 4-1 G3S-800-180-029 Power Amplifier Module Functional Block Diagram4-4.1 Main AmplifierThe input and output of the amplifier employ two-stage, class AB amplifiers which provide ap-proximately 32 dB of gain in the 25 MHz frequency band from 869 to 894 MHz. The amplifier op-erates on +27 Vdc, and a bias voltage of +5 Vdc, and is mounted directly on a heat sink that istemperature monitored by a thermostat. If the heat sink temperature exceeds 90° C, a high tem-perature fault occurs. The alarm logic controls the +5 Vdc bias voltage that shuts down the ampli-fier.4-4.2 Error AmplifierThe main function of the error amplifier is to amplify the distortion signal generated by the 1stLoop, to a level that cancels out the distortion and IMD when the error signal is coupled onto themain signal at the amplifier output. The error amplifier is a balanced multistage, class AB ampli-fier.4-4.3 Amplifier MonitoringIn the main and error amplifier modules, all normal variations are automatically compensated forby the feedforward loop control. However, when large variations occur beyond the adjustmentrange of the loop control, a loop fault will occur. The alarms are displayed on the front panel indi-cators and output via a 21-pin connector on the rear of the module to the subrack summary board
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 4-3 April 2002for subsequent remote monitoring via the ALARMS connector. Refer to paragraph 2-6 as well asfigure 2-2 and table 2-3 for a description of the ALARMS connector.4-4.4 Amplifier Module CoolingAlthough each amplifier module contains its own heat sink, it is cooled with forced air. Four fansare used for forced air-cooling and redundancy. The fans, located on the front and rear of theamplifier module, draw air in through the front of the amplifier and exhaust hot air out the back ofthe module. The fans are field replaceable.4-5 Power DistributionPrimary DC power for the system is provided by the host system to the MCR30829-1-3 Series orcompatible subrack. The subrack supplies each amplifier module with +27 Vdc directly and viathe RF power splitter/combiner. The amplifier module has a DC/DC converter that converts the+27 Vdc to +15 Vdc, +5 Vdc and -5 Vdc.4-6 IntermodulationThe G3S-800-180-029 amplifier is designed to deliver a 180-watt nominal composite averagepower (210 W max.), multi-carrier signal, occupying a bandwidth less than or equal to 25 MHz, inthe band from 869 to 894 MHz. The maximum average power for linear operation, and thus theamplifier efficiency, will depend on the type of signal amplified.Three or more CW tones of equal input power will lower individual intermodulation products. If thefrequencies are not equally spaced, the level of intermodulation products gets very low. When thefrequencies are equally spaced, those products fall on top of each other on the same frequencygrid. The average power of all intermodulation beats falling on the same frequency is called thecomposite intermodulation; it is -60 dBc or better.4-7 AlarmsThe presence of several plug-in amplifier alarms can be detected at the DC and logic connectoron the amplifier rear panel. Refer to table 2-3 and figure 2-2 for a description of the connector.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 5-1 April 2002Section 5 Maintenance5-1 IntroductionThis section contains periodic maintenance and performance test procedures for the MulticarrierCellular Amplifier. It also contains a list of test equipment required to perform the identified tasks.NOTECheck your sales order and equipment warranty before attempting to service or repairthe unit. Do not break the seals on equipment under warranty or the warranty will benull and void. Do not return equipment 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.WARNINGWear proper eye protection to avoid eye injury when using compressed air.Table 5-1 Periodic MaintenanceTask Interval ActionCleaningAir Vents 30 Days Inspect and clean per paragraph 5-4InspectionCables and Connec-tors 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 system is listed in table 5-2. Equivalent test equip-ment may be substituted for any item, keeping in mind that a thermistor type power meter is re-quired.NOTEAll RF test equipment must be calibrated to 0.05 dB resolution. Any deviation from thenominal attenuation must be accounted for and factored into all output readings.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 5-2 April 2002Table 5-2 Test Equipment RequiredNomenclature Manufacturer ModelSignal Generator RDL IMD-801D-03A30 dB Attenuator, 500 Watt Weinschel Corp. 53-30-3420 dB Attenuator, 20 Watt(2 each) TenulineSpectrum Analyzer H.P. 8560ECoax Directional Coupler H.P. 778DPower Meter/Sensor H.P. 437B/8481ANetwork Analyzer H.P. 8753CCurrent Probe5-4 Cleaning Air Inlets/OutletsThe air inlets and outlets should be cleaned every 30 days. If the equipment is operated in a se-vere dust environment, they should be cleaned more often as necessary. Turn off DC powersource before removing fans. If dust and dirt are allowed to accumulate, the cooling efficiencymay be diminished. Using either compressed air or a brush with soft bristles, loosen and removeaccumulated dust and dirt from the air inlet panels.5-5 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.NOTEThe frequencies used in this test are typical for an amplifier with a 25 MHz band from869 MHz to 894 MHz. Select evenly spaced F1, F2, F3, and F4 frequencies that cover theinstantaneous bandwidth of your system.5-5.1 Amplifier System Performance TestThis test is applicable to the G3S-800-180-029 amplifier modules. To perform the test, proceed asfollows:1. Connect test equipment to the amplifier as shown in figure 5-1.NOTEDo not apply any RF signals at this time.Turn on signal generator and set frequency F1 to 880 MHz, F2 to 883 MHz, F3 to 886 MHz,and F4 to 889 MHz. Adjust each signal generator output so that the sum power output fromall four signal generators equals -6 dBm at the input.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 5-3 April 2002Unit Under TestG3S-800-180Plug-inAmplifier Module+27 VdcGnd RF InRFOut20 dBDirectional Coupler 30 dBAttenuator500 W20 dBAttenuator20 W Power MeterSensor Head8482A1:2SplitterPower MeterSensor Head8482ANetwork Analyzer8753CSignalGeneratorFilter /IsolatorSpectrum Analyzer8651EFigure 5-1 Amplifier System Test Setup Diagram5-5.1.1 Amplifier IMD Test And Current Test2. Adjust attenuator for an input signal at -10 dBm. Turn on the amplifier by setting RF ONswitch of amplifier. Adjust variable attenuator to set amplifier power output on power meter to180 watts. Measure IMD on spectrum analyzer. IMD should be -60 dBc max. Record testdata in table 5-3. Set RF ON switch to OFF.3. With the amplifier module set at 180 watts power output, use the current probe (magneticfield type) and measure the dc current flow from the +27 Vdc power source. Current shouldbe 70 amps maximum. Record test data in table 5-3.5-5.1.2 Gain Test4. Disconnect spectrum analyzer from test setup, and connect the network analyzer.5. Set network analyzer as follows:Ø Power output to -10 dBm.Ø Frequency start to 869 MHz.Ø Frequency stop to 894 MHz.Ø Normalize the network analyzer for gain and return loss.6. Check the gain across the band from 869 MHz to 894 MHz. Gain should be between 58 dB.Record test data in table 5-3.5-5.1.3 Harmonics Test7. With the power set at 180 watts power output, use the spectrum analyzer and check the fre-quency band from 869 MHz to 894 MHz for harmonics. Harmonics should be 5 dBm maxi-mum. Record test data in table 5-3.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 5-4 April 20025-5.1.4 Spurious Test8. With the power amplifier set at 180 watts power output, use the spectrum analyzer and checkthe frequency band from 869 MHz to 894 MHz for spurious signals. Spurious signals shouldbe -60 dBc maximum. Record test data in table 5-3.5-5.1.5 Input Return Loss Test9. Reset and turn on amplifier module. Read and record the S11 return loss measurement onnetwork analyzer. Input return loss should be –16 dB maximum. Record test data in table5-3.Table 5-3 Multicarrier Cellular Amplifier Test Data SheetDATE _________________________________AMPLIFIER S/N _________________________TEST CONDITIONS:Load and Source Impedance: 50 OhmsVSWR: < 1.2:1Supply Voltage: +27 Vdc ±1.0 VdcTEST SPECIFICATION MIN MAX DATA4-TONE IMD Vcc = 27 VdcPO = 180 WFreq.: 880, 883, 886, and 889MHz-60 dBcRF Gain Vcc = 27 VdcPO = 180 WFreq. = 880 MHz 57.5 dB 58.5 dBGain Flatness Vcc = 27 Vdc ±1 VdcPO =180 W869-894 MHz Band -0.5 dB +0.5 dBHarmonics Vcc = 27 VdcPO = 180 W869-894 MHz Band 5 dBmSpurious Vcc = 27 VdcPO =180 W869-894 MHz Band -60 dBcInput ReturnLossVcc = 27 VdcPO = 180 W869-894 MHz Band -16 dBDC Power Vcc = 27 VdcPO = 180 W4 Tones 70 AmpsPASS _________________________________ FAIL _______________________________Tested by ______________________________
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 5-5 April 20025-6 Field Replaceable Parts And ModulesThe following parts and modules can be replaced in the field on site by a qualified technician withexperience maintaining RF power amplifiers and similar equipment:1. G3S-800-180-029 power amplifier modules2. Cooling fans5-6.1 G3S-800-180-029 Power Amplifier ModuleTo replace a power amplifier module, proceed as follows:1. Set both the RF ON On/Off/Reset switch and the power ON/OFF switch on the front panel ofthe amplifier module to OFF.2. Loosen two screws that secure amplifier module to subrack.CAUTIONThe amplifier is equipped with a spring clip on each side panel to prevent the amplifierfrom being fully removed from the subrack via the front panel handles. When removingthe amplifier from the subrack, it is very important to support the amplifier such that therear of the module does not suddenly drop when it disengages from the track. A dropsuch as this could damage the module or cause personal injury.Figure 5-2 Amplifier Spring Clip Location3. Use the handle on the front of the module, and with a steady even pressure, gently pull themodule about half way out of subrack until the spring-clips prevent the amplifier from beingremoved (refer to figure 5-2).4. Simultaneously press the front half of each spring clip towards the center of the amplifier andresume removal of the amplifier.Spring Clip
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 5-6 April 20025-6.2 Cooling FansTo replace a front cooling fan, proceed as follows:1. Loosen four snap fasteners that secure fan to amplifier module. Disconnect fan power con-nector from amplifier module.To replace a rear cooling fan, proceed as follows:1. Remove amplifier module from subrack; see paragraph 5-6.1 preceding.1. Loosen the four Phillips head screws that secure the fan to the amplifier module. Disconnectthe fan power connector from the amplifier module.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 6-1 April 2002Section 6 Troubleshooting6-1 IntroductionThis section contains a list of problems and a few suggested actions that may correct the prob-lem. If the suggested corrective action does not eliminate the problem, please contact your Pow-erwave field representative or the factory for further instructions.NOTECheck your sales order and equipment warranty before attempting to service or repairthe unit. Do not break the seals on equipment under warranty or the warranty will benull and void. Do not return equipment for warranty or repair service until propershipping instructions are received from the factory.6-2 TroubleshootingThe following are general guidelines established to aid Field Engineers or Cell Site Technicians inthe proper method of Powerwave equipment fault resolution by fault mode.6-2.1 DC Voltage Indicators Not Illuminated1. Check the front panel ON/OFF switch.2. Check the power plant circuit breaker.3. Check for +27 + 1.0 VDC at the amplifier subrack input.A. If the voltage is low, verify that all DC connections between the power plant and the am-plifier subrack are tight.B. If the voltage is correct,1. Remove the amplifier from the subrack slot and move the amplifier to another am-plifier subrack slot.2. Check the voltage on the power pins of the mating amplifier and amplifier subrackconnector.3. Verify that the amplifier DC connections are not damaged.4. Return the amplifier to the factory for repair.6-2.2 OVER PWR Illuminated or Blinking1. If all the amplifiers in a given amplifier subrack are in Over Pwr and the LPA Disable LED isilluminate, then the input RF power level is too high and the amplifiers have been turned off.RF power may be incorrectly set during equipment commissioning. This may be due to afaulty jumper cable. Verify the amplifier subrack output cables, transmit filter, and directionalcoupler are in proper working order. The loss between the amplifier subrack and the hatchplate is typically less than 2.0 dB.2. If all the amplifiers in a given amplifier subrack are in Over Pwr and the LPA Disable LED isnot illuminated, then the input RF power level is too high. The amplifier subrack is attemptingto maintain a safe power output level (smart subracks with True RMS power detectors andvoltage variable attenuators only). RF power may be incorrectly set during equipment com-missioning. This may be due to a faulty jumper cable. Verify the amplifier subrack output ca-
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 6-2 April 2002bles, transmit filter, and directional coupler are in proper working order. The loss between theamplifier subrack and the hatch plate is typically less than 2.0 dB.3. If only one or two amplifiers in a given amplifier subrack are in Over Pwr and the LPA DisableLED is blinking, then the amplifier subrack is probably in Sleep Mode (smart subracks withTrue RMS power detectors and voltage variable attenuators only).A. Pressing the On/Off/Reset switch momentarily in the Up position or cycling DC power onthe amplifier should bring the amplifier back on-line.B. Sleep Mode firmware may be disabled in the field with a PC interface and softwareavailable from Powerwave.4. Move the amplifier to another slot in a different subrack, if available. Mark the amplifier with asticker or place a tie wrap on the handle to identify the amplifier. Monitor for future failure.A. If the same amplifier fails again, return the amplifier to the factory for repair.B. If the replacement amplifier in the original subrack fails, replace the amplifier subrack.6-2.3 HIGH TEMP Illuminated5. If an amplifier is in HIGH TEMP and the LPA Disable LED is illuminate, then the amplifierheat sink temperature is too high. This may be due to:A. High ambient temperature.B. Fan failure.C. Insufficient air-volume capacity. Most of Powerwave’s amplifiers require a certainamount of free-space to allow proper airflow.6. Correct the heat problem, then reset the amplifier by momentarily pressing the Reset buttonon the amplifier front panel up.6-2.4 VSWR Illuminated7. If all the amplifiers in a given amplifier subrack are in VSWR and the LPA Disable LED is il-luminate, then the output RF reflected power level is too high and the amplifiers have beenturned off. This may be due to a faulty jumper cable or transmit filter. Verify the amplifiersubrack output cables, transmit filter, and directional coupler are in proper working order. Theloss between the amplifier subrack and the hatch plate is typically less than 2.0 dB. This faultnormally occurs during site or just following site power setting and normally takes about 10 to15 minutes to reveal itself. This fault may not occur at low power levels (i.e. when just one ortwo channels are up).8. If one amplifier in an amplifier subrack is in VSWR and the LPA Disable LED is illuminated,then the output RF reflected power level is too high for that amplifier. This may be due toA. A damaged or recessed amplifier RF output connector. Return the amplifier to the fac-tory for repair.Mishandling of the amplifier normally causes recessed pins. Before installing an ampli-fier, look at the D-sub connector to ensure none of the pins are recessed, bent or thatthe outer connector shield is not damaged. When installing the amplifier, do not forcethe amplifier into the slot. Gentle even pressure is all that is needed to properly seat theamplifier.B. Improper seating of the amplifier.1. Ensure the amplifier thumbscrews are properly tightened.2. Try seating the amplifier in another subrack slot.3. Try seating the amplifier in a subrack in another sector.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 6-3 April 20026-2.5 DC FAIL IlluminatedIf an amplifier is in DC FAIL and the LPA Disable LED is illuminate, then one of the four amplifierDC voltages is either out of tolerance or not present. Return the amplifier to the factory for repair.6-2.6 FAN FAIL IlluminatedIf an amplifier is in FAN FAIL, then the one of the amplifier’s cooling fans has failed. Replace thefan.Fan failure does not cause the amplifier to shut down; amplifier shut down is determined by heatsink temperature.6-2.7 LOOP FAIL Illuminated9. Loop Fail is always accompanied by LPA Disable LED illuminated. This may be due toA. Inability of the amplifier to maintain a 180° phase shift between the first and secondloops.B. A damaged error amplifier. This can be caused by1. Out of band spurious or intermods being applied at too high of a level at the ampli-fier input port. An input band-pass filter may be necessary to correct this problem.2. Disconnecting amplifier RF output cables while the amplifier is still turned on. Al-ways turn the amplifier off when moving output RF cables from the hatch plate totest equipment and back again.C. Improper power balance between amplifiers in a given subrack.1. Ensure the amplifier thumbscrews are properly tightened. Reset the amplifier bymomentarily pressing the Reset button on the amplifier front panel up.2. Try seating the amplifier in another subrack slot.3. Try seating the amplifier in a subrack in another sector.6-2.8 LOW PWR IlluminatedLow Power is always accompanied by the LPA Disable LED illuminated. This is due to the gain ofeither the internal preamplifier or main amplifier being 0.5 dB (typically) or more below the ampli-fier specification. The amplifier should be returned to the factory.6-2.9 LPA DISABLE Illuminated10. LPA Disable LED illuminated indicates that the amplifier RF section is turned off. This maybe due toA. An accompanied alarm indicating a critical amplifier fault (i.e. Loop Fail fault).B. A response to a subrack command, purposely inhibiting the amplifier (i.e. Sleep Modeactivation)C. Improper seating of the amplifier in the subrack.11. Ensure the amplifier thumbscrews are properly tightened. Reset the amplifier by momentarilypressing the Reset button on the amplifier front panel up.12. Try seating the amplifier in another subrack slot.13. Try seating the amplifier in a subrack in another sector.
G3S-800-180-029 Installation & Service Manual Copyright Powerwave Technologies, Inc., April 2002. All rights reserved044-05112 Rev. A 6-4 April 20026-3 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 returning equipment tothe 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 RMAnumber 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 designed for theamplifier be used. The original packaging material is reusable. If it is not available, contactPowerwave’s Customer Service Department for packing materials and information.

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