Powerwave Technologies 5JS0042 Linear Feed-Forward Power Amplifier User Manual Part 3

Powerwave Technologies Inc Linear Feed-Forward Power Amplifier Part 3

User Manual Part 3

044-05055 Rev. A 1-1GENERAL DESCRIPTION1-1. INTRODUCTIONThis manual contains information and procedures for installation, operation, and maintenance ofPowerwave’s Generation 3.1 amplifier system. The manual is organized into six sections asfollows:Section 1. General DescriptionSection 2. InstallationSection 3. Operating InstructionsSection 4. Principles of OperationSection 5. MaintenanceSection 6. Troubleshooting1-2. GENERAL DESCRIPTIONThe G3X-800 Series (NTL107AA) amplifier (figure 1-1) is a linear, feed-forward power amplifierthat operates in the 25-MHz frequency band from 869 MHz to 894 MHz. The amplifier cansimultaneously transmit multiple frequencies, with better than -65 dBc third order intermodulationdistortion (IMD). The amplifier system is modular in design, and is ideally suited for use inAMPS/TDMA/CDMA base stations. The plug-in G3X-800 Series (NTL107AA) amplifier modulescan each provide 110 watts of power and function completely independently of each other. Theamplifier modules are designed for parallel operation to produce high peak power output andbackup redundancy for remote applications. The system is housed in the MCR20XX Series(NTL107AC) subrack (figure 1-2) which holds two G3X-800 Series (NTL107AA) amplifiers toproduce up to 200 watts output. All solid-state, the system is designed to provide trouble-freeoperation with minimum maintenance. The system's modular construction and unique and highlyeffective LED-based operational status and fault indicators help minimize downtime. The turn-onand turn-off sequences of voltages are fully automatic, as is overload protection and recycling.Inadvertent operator damage from front panel manipulation is virtually impossible.NoticeTo comply with FCC regulations, nochannels existing within 200 kHz spacingfrom the edges of any frequency block are tobe used for transmission.The MCR20XX Series (NTL107AC) subrack contains an RF power splitter/combiner and a controlmodule that monitors the functional status of all plug-in amplifiers. The rear panel of the subrackhas the system RF I/O connectors and DC power input terminals. The front panel of eachamplifier module has unit level status/fault indicators and a power on/off circuit breaker. Primarypower for the amplifier system is +27 Vdc. Cooling for each plug-in amplifier module is providedby two fans mounted on the front and two on the rear of the module. The fans draw outside airthrough the front of the module and exhaust hot air out through the rear of the module.Section1
044-05055 Rev. A 1-21-3. FUNCTIONAL AND PHYSICAL SPECIFICATIONSFunctional and physical specifications for the amplifier system are listed in table 1-2.1-4. EQUIPMENT CHANGESPowerwave Technologies, Inc. reserves the right to make minor changes to the equipment,including but not necessarily limited to component substitution and circuitry changes. Changesthat impact this manual may subsequently be incorporated in a later revision of this manual.1-5. ORDERING INFORMATIONTable 1-1 following gives the part numbers and descriptions to be used when ordering either anentire system or individual major components that comprise the system.Table 1-1. Major System ComponentsSYSTEMORDERNUMBERDESCRIPTION OFSYSTEM NUMBER SUB-COMPONENTMODELNUMBERQTYPERSYSTEMDESCRIPTION OF SUB-COMPONENT MODELNUMBERMCR20XXSeries(NTL107AC)200 W 869-894 MHz LinearSystem for Base StationEquipment.MCR20XXSeries(NTL107AC)1 2-Unit 23” Subrack.G3X-800Series(NTL107AA)2 110 W 869-894 MHz AmplifierModule.800-00972-001 4 Front fan assembly (Intake)800-00972-002 4 Rear fan assembly (Exhaust)
044-05055 Rev. A 1-3
044-05055 Rev. A 1-4
044-05055 Rev. A 1-5Table 1-2. Generation 3.1 Multicarrier Cellular Amplifier System Functional SpecificationsFrequency Range: 869-894 MHzTotal Output Power (Minimum) inMCR20XX (NTL107AA) System: 110 W typical (1 Module)200 W typical (2 Modules)Maximum Input Power Overdrive fault activates when input power >5 dBmIntermodulation Distortionand In-Band Spurious: -68 dBc (Typical) @ +24 to +28 Vdc @ 200 Watts(-65 dBc (Max) @ +21.7 to +24 Vdc)Nominal RF Gain: 31 ±1 dB to 49 ±1 dB AdjustableGain Variation: ± 0.6 dB @ 27 Vdc ±1 Vdc+ 0.6 / -0.8 dB @ 24 to 26 VdcOutput Port Return Loss: 16 dB (Min)Output Protection: Mismatch Protected (Isolator)Input Port Return Loss: 16 dB (Min)Second Harmonic: -13 dBm (Max)Out of Band Spurious: -60 dBc (Max) @ +24 to +28 VdcDC Input Voltage: 21.7 to 30 Vdc (24 to 28 Vdc for rated operation)DC Input Current: 110 Amps (Typical) @ 27 ±1 Vdc Input, 200 WattsPA Self Protection: MCA Disabled Upon 5-Second Continuous AlarmOperating Temperature: -5 ºC to +60 ºC AmbientStorage Temperature: -40 ºC to +85 ºCOperating Humidity: 5% - 95% Relative Humidity (Noncondensing)Storage Humidity: 0% - 95 % Relative Humidity (Noncondensing)ConnectorsDC Power:RF INPUT:RF OUT (Antenna):SYSTEM ALARM:RS-485MICROPROCESSOR INTERFACE¼-20 studsSMAType N9-Pin D-Subminiature Female9-Pin D-Subminiature Female9-Pin D-Subminiature FemaleAlarms Over Power, VSWR, DC Failure, High Temperature, LoopFailure, Fan FailureMonitors Forward Power and Reverse PowerDimensions:G3X-800 Series (NTL107AA)Amplifier:MCR20XX Series(NTL107AC) Subrack:5.22" High, 17.00” Wide, 20.44” Deep(Including handles, rear fans)11.33” High, 23.00” Wide, 22.77” Deep(With amplifiers inserted)

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