Glenayre Electronics GL-T8500-CN Base Station User Manual users manual

Glenayre Electronics Inc Base Station users manual

users manual

Print Date: 12/17/96 Copyright © 1996 Glenayre250-Watt Gold Line Power Amplifier Issue 1, Rev. C: 10/21/96Specifications subject to change without noticeCopyright © 1996 GlenayreAll rights reserved. No part of this work may be reproduced or copied in any form or by any means—graphic, electronic, or mechanical, including photocopying, recording, taping, or information-retrieval system—without written permission of Glenayre.Gold Line GL-T8500 250-Watt, 900-MHz Power AmplifierUSER MANUAL PN 9110.00160 (old part number = 916-8500-000)REV CRELEASED
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160Document Change Record Issue 1, Rev. C: 10/21/96Copyright © 1996 Glenayre Print Date: 12/17/96Document Change RecordRevision: 0, PreliminaryDate: 05/04/95Changes: none, originalIssue: Rev BDate: 02/02/96Changes: new formatIssue: Rev CDate: 10/21/96Changes: made released
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 Table of ContentsPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: -i Table of Contents1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11.1 Manual Scope . . . . . . . . . . . . . . . . . . . . . . . . 1-11.2 Applicable Documents. . . . . . . . . . . . . . . . . . . . . 1-11.3 Manual Sections . . . . . . . . . . . . . . . . . . . . . . . 1-12 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3-13.2 Physical Description. . . . . . . . . . . . . . . . . . . . . . 3-13.2.1 Mounting Provisions . . . . . . . . . . . . . . . . . . . . . . . .3-13.2.2 PA Front. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13.2.2.1 Driver Board . . . . . . . . . . . . . . . . . . . . . .3-13.2.2.2 PA Boards. . . . . . . . . . . . . . . . . . . . . . . .3-43.2.2.3 Combiner Board. . . . . . . . . . . . . . . . . . . . .3-43.2.2.4 Metering Board . . . . . . . . . . . . . . . . . . . . .3-43.2.3 PA Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-43.2.3.1 Isolator . . . . . . . . . . . . . . . . . . . . . . . . .3-43.2.3.2 Fan . . . . . . . . . . . . . . . . . . . . . . . . . . .3-43.2.3.3 Equipment Connectors . . . . . . . . . . . . . . . . .3-43.3 Functional Description . . . . . . . . . . . . . . . . . . . . . 3-53.3.1 RF Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-53.3.2 Isolator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-53.3.3 Metering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-64 INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-14.1 Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4-14.2 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14.3 Ultimate Disposition . . . . . . . . . . . . . . . . . . . . . 4-15 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15.1 Controls and Indicators . . . . . . . . . . . . . . . . . . . . 5-15.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 5-15.2.1 Turn PA On and Off . . . . . . . . . . . . . . . . . . . . . . . .5-15.2.2 Turn Fan On and Off . . . . . . . . . . . . . . . . . . . . . . . .5-15.2.3 Key and Unkey PA . . . . . . . . . . . . . . . . . . . . . . . . .5-16 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16.1 Power Distribution . . . . . . . . . . . . . . . . . . . . . . 6-16.1.1 Primary Power . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160Table of Contents Issue 1, Rev. C: 10/21/96Page: -ii Copyright © 1996 Glenayre Print Date: 12/17/966.1.1.1 Metering Board +25V Signal Flow. . . . . . . . . . . 6-16.1.1.2 Power Amplifiers +25V Signal Flow. . . . . . . . . . 6-16.1.2 Secondary Power . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26.1.2.1 Metering Board +13.5V Signal Flow. . . . . . . . . . 6-26.1.2.2 Preamplifier Module +13.5V Signal Flow . . . . . . . 6-26.1.3 Fan Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26.2 RF Distribution . . . . . . . . . . . . . . . . . . . . . . . 6-36.2.1 Driver Board RF Flow . . . . . . . . . . . . . . . . . . . . . . . 6-36.2.2 PA Board RF Flow . . . . . . . . . . . . . . . . . . . . . . . . . 6-46.2.3 Combiner Board RF Flow . . . . . . . . . . . . . . . . . . . . . 6-46.2.4 Isolator RF Flow . . . . . . . . . . . . . . . . . . . . . . . . . . 6-56.3 Control Distribution . . . . . . . . . . . . . . . . . . . . . 6-56.3.1 AGC Signal Flow. . . . . . . . . . . . . . . . . . . . . . . . . . 6-56.3.2 Multiplexer Control Signal Flow . . . . . . . . . . . . . . . . . . 6-66.4 Status Distribution . . . . . . . . . . . . . . . . . . . . . . 6-66.4.1 Mux Analog Status Signal Flow . . . . . . . . . . . . . . . . . . 6-66.4.2 PA Fault Signal Flow . . . . . . . . . . . . . . . . . . . . . . . . 6-67 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18 CHECKOUT AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 8-19 REMOVAL AND REINSTALLATION . . . . . . . . . . . . . . . . . . . . 9-19.1 PA Chassis Removal and Reinstallation . . . . . . . . . . . . . 9-19.2 PA RF Module Removal and Reinstallation . . . . . . . . . . . . 9-19.3 Metering Board Removal and Reinstallation . . . . . . . . . . . . 9-1
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 List of FiguresPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: -iii List of FiguresFigure 3-1 250-Watt, 900-MHz Power AmplifierFront View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Figure 3-2 250-Watt, 900-MHz Power AmplifierRear View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Figure 3-3 PA Simplified-Block Diagram . . . . . . . . . . . . . . . . . . . . . . 3-5Figure 5-1 Front-Panel View with Cover Removed . . . . . . . . . . . . . . . . . 5-2Figure 6-1 250-Watt PA Interconnection Diagram. . . . . . . . . . . . . . . . . . 6-8Figure 6-2 250-Watt PA Functional Diagram . . . . . . . . . . . . . . . . . . . . 6-9Figure 6-3 250-Watt PA Detailed Functional Diagram . . . . . . . . . . . . . . .6-10Figure 6-4 Metering Board Functional Diagram . . . . . . . . . . . . . . . . . . .6-12Figure 9-1 PA Removal and Reinstalllation . . . . . . . . . . . . . . . . . . . . . 9-2Figure 9-2 PA RF Module Removal and Reinstallation . . . . . . . . . . . . . . . 9-3Figure 9-3 Metering Board Removal and Reinstallation . . . . . . . . . . . . . . . 9-5
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160List of Figures Issue 1, Rev. C: 10/21/96Page: -iv Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 List of TablesPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: -v List of TablesTable 1-1 Applicable Documents . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Table 1-2 Manual Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Table 2-1 Power Amplifier Specifications. . . . . . . . . . . . . . . . . . . . . . 2-1Table 3-1 PA Circuit Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Table 6-1 Multiplexer Analog Status Inputs. . . . . . . . . . . . . . . . . . . . . 6-7
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160List of Tables Issue 1, Rev. C: 10/21/96Page: -vi Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 GENERALPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 1-1 1 GENERAL1.1 Manual ScopeThis manual provides information for the 250-watt, 900-MHz Gold Line power amplifier,part number 265-0082-013. Also included is information for the optional triple isolator,part number 7914.00010.1.2 Applicable DocumentsThis manual is incomplete without additional Gold Line manuals. Refer to Table 1-1 for alisting and function of these manuals. 1.3 Manual SectionsTable 1-2 lists the sections of this manual with a summary of their contents.Table 1-1 Applicable Documentsdocument part number functionGL-T8500/8600 system man-ual9110.00163 describes fully racked-up Gold Line transmitterVDT manual 9110.00164 describes PA control software installed in exciterexciter manual 9110.00172 describes exciter/PA control equipment in transmitter250-watt PA 9110.00160 this manualpower supply manual 9110.00159 describes 50A/90A power supply equipment in transmitter
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160GENERAL Issue 1, Rev. C: 10/21/96Page: 1-2 Copyright © 1996 Glenayre Print Date: 12/17/96 Table 1-2 Manual Sections section contents1. General introduction and purpose of manual2. Specifications significant measurements of power amplifier3. Description introduction and principal characteristics of power amplifier4. Installation and Setup initial installation and activation of power amplifier5. Operation operation of power amplifier6. Theory of Operation detailed functional description of circuitry within power amplifier7. Maintenance procedures to be performed on specific intervals to maintain optimum performance of power amplifier8. Checkout and Troubleshooting verification of proper operation, correction to proper operation of power amplifier9. Removal and Reinstallation replacement procedures for power amplifier and selected subassemblies
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 SPECIFICATIONSPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 2-1 2 SPECIFICATIONSTable 2-1 lists the significant equipment-level specifications for the Gold Line poweramplifier.Table 2-1 Power Amplifier Specificationsmeasurement specificationheight 8.75 in (22.23 cm)width 19 in (48.3 cm)depth 8 in (20.3 cm)weight 26 lb (12 kg)RF output power 100 - 250 wattsRF bandwidth 900 - 960 MHzRF input power 200 - 400 mWRF impedance 50 ohmsoperating voltages 25 vdc, 25 Vdc, 13.5 VdcPA 25 Vdc current 72 mA - 33 Afan 25 Vdc current 750 mA13.5 Vdc current 3.3 Aambient temperature -30° - +70° Chumidity 0 - 95% noncondensingaltitude to 10,000 ft (3050 m)
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160SPECIFICATIONS Issue 1, Rev. C: 10/21/96Page: 2-2 Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 DESCRIPTIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 3-1 3 DESCRIPTION3.1 IntroductionFigure 3-1, 250-Watt, 900-MHz Power Amplifier Front View, and Figure 3-2, 250-Watt,900-MHz Power Amplifier Rear View,show the Gold Line power amplifier (PA). This is a250-watt PA intended for use in a GL-T8500 paging transmitter with an RF of 900 MHznominal. This PA is characterized by integrated monitoring devices that supply criticalstatus information to a Gold Line exciter/PA control (exciter). This exciter contains diag-nostic software that can detect and report a faulty PA circuit board.3.2 Physical Description3.2.1 Mounting ProvisionsThe PA is mounted to the front of most standard 19-inch equipment racks by means of eightscrews. The front panel of the PA may by removed while the PA is mounted in the rack.Two quarter-turn fasteners secure the front panel to the PA. Most PA circuit boards may bereplaced while the PA is mounted in the rack.3.2.2 PA FrontFigure 5-1 shows the front view of the PA with the front panel removed. This exposes theRF and shielded compartments, which contain the PA circuit boards. Table 3-1 lists the PAcircuit boards. 3.2.2.1 Driver BoardThe driver board (A1) contains the preamp module, the intermediate PA (IPA), and the PAdrivers (driver-1 and driver-2). These devices, in addition to one resistor, are mounteddirectly on the PA heat sink. The driver board contains three connectors: two on the front(J1 and J2) and one on the back (J3). Two RG316-type cables (not shown) are attached tothe front of the board.Table 3-1 PA Circuit Boardsnomenclature part number locationdriver board A1 263-0082-022 RF compartmentPA1 board A2 263-0082-007 RF compartmentPA2 board A3 263-0082-007 RF compartmentcombiner board A4 263-0082-021 RF compartmentmetering board A5 263-0082-018 shielded compartment
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160DESCRIPTION Issue 1, Rev. C: 10/21/96Page: 3-2 Copyright © 1996 Glenayre Print Date: 12/17/96v0222.hglFigure 3-1 250-Watt, 900-MHz Power AmplifierFront View
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 DESCRIPTIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 3-3 v0221.hglFigure 3-2 250-Watt, 900-MHz Power AmplifierRear View
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160DESCRIPTION Issue 1, Rev. C: 10/21/96Page: 3-4 Copyright © 1996 Glenayre Print Date: 12/17/963.2.2.2 PA BoardsTwo PA boards, PA1 (A2) and PA2 (A3), contain the power amplifiers. The PA boards areidentical but are mounted with different orientations. Each PA board contains an A and a Bpair of power amplifiers. These amplifiers and six resistors are mounted directly on the PAheat sink. Connectors J1 and J3 and an RG142-type cable (not shown) are attached to thefront of each board.3.2.2.3 Combiner BoardThe combiner board combines the outputs of the PA boards. The combiner board containsa resistor, mounted directly on the PA heat sink. Connectors J1, J2, and J3 are on the frontof the board. An RG393-type cable is attached to the back of the board. This cable termi-nates with a type-N connector and extends through the rear of the PA.3.2.2.4 Metering BoardThe metering board contains the monitoring circuits for the PA. A bank of nine automotivespade-type fuses protect the PA. A transistor is mounted directly on the PA heat sink. Themetering board contains connectors J1, J2, J4, J5, and P1 on the front and J3 on the back.The board contains one LED (DC POWER).3.2.3 PA RearFigure 3-2 shows the back view of the PA. The PA back panel conceals the fan compart-ment. The isolator and fan are mounted on the back panel. The PA equipment connectorsterminate on cables that are routed through grommeted holes in the back panel.3.2.3.1 IsolatorThe standard isolator (shown) improves the intermodulation performance of the PA by 25dB. This isolator is mounted on its own heat sink, which extends into the fan compartment.The optional triple isolator (not shown) improves the intermodulation performance of thePA by 75 dB, and is mounted on the PA. Both isolators contains three connectors: two type-N and one BNC. 3.2.3.2 FanA single fan provides cooling for the PA and standard isolator. The fan is located within thefan compartment and is covered by a finger guard. The fan runs continuously wheneverpower is applied by the power supply equipment.3.2.3.3 Equipment ConnectorsThere are five equipment connectors in addition to those on the isolator. Two 1/4-inch ringlugs are designated as plus (red) and minus (black). A 9-pin plug-and-socket connector isdesignated as P2. A DB15-type connector is designated as PA CONTROL. A BNCconnector is designated as P3.
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 DESCRIPTIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 3-5 3.3 Functional DescriptionFigure 3-3 shows a simplified, functional diagram of the PA. The driver, combiner, and PAboards constitute the RF amplifier circuitry of the PA. Monitoring and controlling this RFamplifier is the metering board. Figure 3-1 shows the RF amplifier, isolator, and meteringcircuitry within the PA. Figure 3-3 PA Simplified-Block Diagram 3.3.1 RF AmplifierThe RF amplifier receives its RF input through the BNC connector P3. A detector circuitin the RF amplifier monitors this RF input. The RF input is amplified by means of fouramplifier stages. Each amplifier stage receives its dc input power through the meteringcircuit. Power detectors at critical locations throughout the RF amplifier provide samplevoltages to the metering circuit. The amplified output of the RF amplifier is applied to theinput type-N connector on the isolator.3.3.2 IsolatorThe isolator prevents intermodulation of the RF signal that may occur from nearby trans-missions. The RF signal is routed through input and output type N connectors. A detectorcircuit in the isolator monitors the reflected power (VSWR) present at the output type-Nconnector. A sample voltage representing the VSWR level is output through the BNCconnector. The optional triple isolator functions identically to the standard isolator exceptwith a higher level of intermodulation prevention.BNCSTATUS/CONTROLRFAMPLIFIERRFIN ISOLATOR RFOUTMETERINGMETEREDPOWERSTATUSVOLTAGESDCIN25V13.5VTYPE N TYPE NDB-15VSWRSAMPLEBNC1/4 LUGSP2POWERAMPLIFIER
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160DESCRIPTION Issue 1, Rev. C: 10/21/96Page: 3-6 Copyright © 1996 Glenayre Print Date: 12/17/963.3.3 MeteringThe metering board performs control and status reporting for the PA. The metering boardaccepts a 25-Vdc power input through the 1/4-inch lugs and a 13.5-Vdc power inputthrough connector P2. These voltages are regulated and distributed.
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 INSTALLATION AND SETUPPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 4-1 4 INSTALLATION AND SETUP4.1 InstallationThe PA is shipped already installed in a cabinet. To remove or reinstall the PA, refer toSection 9.4.2 SetupSetup of the PA is performed at the system level using an exciter/PA control unit. Refer tothe GL-T8500 system manual. The system manual includes instructions for theseapplicable setup procedures:•adjust forward power•set low power alarm•calibrate reflected power4.3 Ultimate Disposition CautionThis equipment may contain hazardous materials.Check with the local EPA or other environmentalauthority before disposing of this equipment.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160INSTALLATION AND SETUP Issue 1, Rev. C: 10/21/96Page: 4-2 Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 OPERATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 5-1 5 OPERATION5.1 Controls and IndicatorsThe PA has one indicator and no controls. Figure 5-1, Front-Panel View with CoverRemoved shows the location of the PA indicator LED1.5.2 Operation5.2.1 Turn PA On and OffThe PA does not contain an on/off switch, but turns on and off whenever the power supplyequipment is turned on and off. When the PA is on, it remains in a standby condition untilkeyed. Refer to the power supply manual for turn-on and turn-off procedures.5.2.2 Turn Fan On and OffThe fan does not contain an on/off switch, but turns on and off whenever the power supplyequipment is turned on and off. The fan runs continuously whenever the power supplyequipment is on. Refer to the power supply manual for turn-on and turn-off procedures.5.2.3 Key and Unkey PAThe PA does not contain a key switch, but is keyed and unkeyed by the exciter/PA controlequipment. This exciter must be keyed and unkeyed remotely through transmittercontroller, or locally through a video display terminal (VDT). Refer to the controllermanual for remote key and unkey instructions, or to the VDT manual for local key andunkey instructions.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160OPERATION Issue 1, Rev. C: 10/21/96Page: 5-2 Copyright © 1996 Glenayre Print Date: 12/17/96v0224.hglFigure 5-1 Front-Panel View with Cover Removed
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 THEORY OF OPERATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 6-1 6 THEORY OF OPERATION6.1 Power DistributionThe PA requires three separate power inputs: primary 25-volt dc power, secondary 13.5-volt dc power, and fan 25-volt dc power. All power inputs are normally provided by theGold Line power supply.6.1.1 Primary PowerRefer to Figure 6-2. Primary 25-volt dc operating power is received through the powercables terminating with 1/4-inch ring lugs. The (-) input (black cable) is bolted directly toPA chassis ground. The (+) input (red cable) is bolted to P1 on the metering board. P1powers the +25V power bus on the metering board. This bus distributes primary power tothe metering board and to each common-base collector (CBC) power amplifier in the PA.6.1.1.1 Metering Board +25V Signal FlowRefer to Figure 6-4. +25 volts from the power bus is supplied through fuse F13 to theseplaces on the metering board: LED1, +25V components, divider circuitry, +5V regulatorand divider circuitry, and +1.2V regulator circuitry.•LED1 activates to illuminate the DC POWER indicator on the front of the PA.•+25V components receive operating power. These components include the currentdetector amplifiers.•Divider circuit reduces the input to a sample voltage, which determines the PA 25Vmetering.•+5V regulator/divider circuitry generates +5V operating power for the metering board+5V components. A portion of this +5V is reduced to a sample voltage, which deter-mines the PA 5V metering.•+1.2V regulator circuitry generates the compensation voltage for the current detectoramplifiers.6.1.1.2 Power Amplifiers +25V Signal FlowRefer to Figure 6-1. +25 volts operating power from the power bus is paralleled throughseven resistors. These resistors are a component of a current detection circuit. Current-Detection TheoryCurrent-detection monitoring occurs on the metering board. The monitored current is routed through a small resistor, resulting in a slight voltage drop across the resistor. This voltage drop is amplified by a current detector amplifier, which generates an out-put voltage proportional to the current flowing through the resistor. This output voltage is the current sample for the monitored current.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160THEORY OF OPERATION Issue 1, Rev. C: 10/21/96Page: 6-2 Copyright © 1996 Glenayre Print Date: 12/17/96The seven monitored +25-volt signals are individually fused before leaving the meteringboard. The signals provide operating power for power amplifiers located on the driver andPA boards. Each signal is routed through a dc bias network. 6.1.2 Secondary PowerSecondary 13.5-volt dc power for the PA is externally fused, at the power supply equip-ment. Refer to Figure 6-1. Secondary power is received through connector P2, whichmates with J2 on the system interconnect harness. Secondary power is connected to J5 onthe metering board. The +13.5 input from J5 is distributed to the metering board and thepreamp module.6.1.2.1 Metering Board +13.5V Signal FlowRefer to Figure 6-2. +13.5-volt power from J5 is paralleled to these places on the meteringboard: +13.5V components, divider circuitry, and heat sink temperature transducer U17.•+13.5V components receive operating power. These components include those withinthe AGC integrator circuit.•Divider circuit reduces the input to a sample voltage, which determines the system PA13.5V metering.•Heat-sink-temperature transducer U17 generates a voltage proportional to the tempera-ture of the PA heat sink, which determines the temperature metering.6.1.2.2 Preamplifier Module +13.5V Signal FlowRefer to Figure 6-2. +13.5-volt power from J5 is routed through a resistor, a component ofa current-detection circuit. The sample provided by this circuit determines the preamplifiercurrent metering. The +13.5-volt power through the resistor is fused by F4 before distribu-tion to the metering board and preamplifier module, on the driver board.6.1.3 Fan Power25-volt dc fan power is fused externally at the power supply equipment. Refer to Figure 6-1. Fan power is received through connector P2, which mates with J2 on the system inter-connect harness. Fan power is applied directly to the fan via a quick-release jack (notshown). Dc-Bias Network TheoryDc bias networks are located on the driver board and PA boards. +25-volt operating power from the metering board is applied to the power amplifiers through a dc bias net-work. The network is tuned and filtered to cause a high impedance to signals from dc to above operating frequency. This prevents RF from transmitting backwards into the me-tering board.
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 THEORY OF OPERATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 6-3 6.2 RF DistributionRefer to Figure 6-1. The PA RF input is received through a BNC connector, which mateswith J3 on the exciter/PA control. This RF input signal (at a nominal 350 mW) is split andamplified into two RF signals (at a nominal 40 watts) by the driver board. Each RF signalis amplified (to a nominal 150 watts) by a PA board. These RF signals are combined intoone RF signal (at a nominal 275 watts) by the combiner board. This is the PA RF output,and is applied to an isolator. The isolator RF output (at a nominal 250 watts for standard)is supplied to an antenna for transmission. All power levels given here and in the followingparagraphs are typical; actual power levels will vary from those given.6.2.1 Driver Board RF FlowThe driver board splits and amplifies a 350-mW RF input into two 40-watt RF outputs.Refer to Figure 6-3. The RF input to the driver board is applied to the preamplifier module(Q1). A portion of the RF input is applied to an RF-detection circuit on the board. Thiscircuit rectifies and filters the RF input into an OK signal. Loss of the RF input and the OKsignal results in an exciter output fault.The preamplifier module is a three-stage RF power amplifier on a single IC. The first andthird stages are powered by an AGC signal. These are the variable gain stages, and controlthe forward power output of the PA. The first and third stages of the preamp module arepowered by an AGC signal, generated on the metering board. AGC signal voltage ismonitored for status only. The second stage of the preamplifier module is a nonvariable-gain stage, powered by +13.5-volt power. The current drawn by the AGC and +13.5-voltpower signals contributes to the preamplifier current metering.The amplified RF output from the preamp module is applied to the IPA (Q2). The currentdrawn from the IPA’s +25-volt power source is monitored to determine the IPA currentmetering. The amplified RF output from the IPA is monitored for forward and reflectedpower levels. The power samples detected at this location determine the IPA forward - andreflected-power metering. Power-Monitoring TheoryPower-monitor circuits are located on the driver board, PA boards, and combiner board. A microstrip line parallel to the RF signal path couples a small portion of the ac signal across a rectifier and filtering circuit. The ac signal may be rectified to detect ei-ther the forward or reflected power. After filtering, a dc sample voltage is available that is proportional to the power detected at the monitored location.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160THEORY OF OPERATION Issue 1, Rev. C: 10/21/96Page: 6-4 Copyright © 1996 Glenayre Print Date: 12/17/96After monitoring, the amplified RF output from the IPA is split in two by means of an RFsplitter, commonly known as a Wilkinson splitter. The two split RF signals are applied todriver-1 (Q3) and driver-2 (Q4). The current drawn from each driver’s +25-volt powersource is monitored to determine the driver-1 and driver-2 current metering. The amplifiedRF outputs from the two drivers are the driver board’s 40-watt RF outputs. 6.2.2 PA Board RF FlowEach PA board amplifies a 40-watt RF input into a 150-watt RF output. Refer to Figure 6-3. The RF input to the PA board is split into four signals by means of three Wilkinson split-ters. Each RF signal drives a power amplifier, for a total of four amplifiers (Q1, Q2, Q3,and Q4). Q1 and Q2 receive operating power from a common +25-volt power source. Thecurrent drawn by this source is monitored to determine the PA board’s A-pair current.Likewise, the current drawn by Q3 and Q4 common +25-volt power source is monitored todetermine the PA board’s B-pair current.The amplified RF outputs from the four power amplifiers are combined into one by meansof three Wilkinson combiners. The RF signal from the last Wilkinson combiner ismonitored for forward and reflected power levels. The power samples detected at thislocation determine the PA board’s forward and reflected power metering. The combinedand monitored RF signal is the PA board’s 150-watt RF output.6.2.3 Combiner Board RF FlowThe combiner board combines two 150-watt RF inputs into a single 275-watt RF output.Refer to Figure 6-3. The two RF inputs are combined by a Wilkinson combiner. Thecombined RF is monitored for forward power level. The power sample detected at thislocation determines the total forward power metering. The combined and monitored signalis the combiner board’s 275-watt RF output.6.2.4 Isolator RF FlowThe isolator conducts its 275-watt RF input only in the forward direction, suppressing anyintermodulation or VSWR present at its RF output. Refer to Figure 6-3. The RF input isapplied through a circulator. The optional triple isolator RF input is applied through threecirculators. Wilkinson Splitter/Combiner TheoryWilkinson splitter and combiner networks are located in the RF signal path on the driv-er board, PA boards, and combiner board. A waster resistor is located a precise dis-tance from the signal junction. This resistor dissipates any out-of-phase imbalance or amplifier imbalance that may exist between the RF signals being split or combined, re-sulting in a more stable amplifier.Circulator TheoryA circulator consists of several circular layers of copper, ferrite, and a magnetic materi-al that biases the ferrite. The circulator has three inputs/outputs. The biased ferrite con-ducts electricity only in one direction, outputting the signal applied at its previous input. Each circulator provides 25 dB of isolation.
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 THEORY OF OPERATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 6-5 The circulator RF output is applied through a notch filter to remove the second harmonicsgenerated by the circulator. This filtered RF is the isolator’s RF output. This RF output istypically 250 watts for a standard isolator or 225 watts for a triple isolator. Any reflectedpower present at the isolator RF output is conducted back through the circulator to arectifier and filtering circuit. This circuit generates a dc sample voltage proportional to theVSWR present at the isolator RF output. The sample voltage determines the total reflected-power metering.6.3 Control DistributionRefer to Figure 6-1. The PA control inputs are received through a DB15 connector, whichmates with J6 on the exciter/PA control. Two types of control inputs are received: AGCreference and multiplexer.6.3.1 AGC Signal FlowThe metering board compares the AGC reference signal (from the exciter) with the totalforward power sample (from the combiner board) to create an AGC signal (to the driverboard). Refer to Figure 6-2. The AGC reference signal and the total forward power sampleare applied to an integrator circuit, which generates the AGC signal. An increase in theAGC reference signal or a decrease in the total forward power sample causes an increasein the AGC signal. This AGC signal provides operating power for the first and thirdamplifier stages of the preamplifier. Divider circuitry reduces a portion of the AGC signalto a sample voltage, which determines the AGC metering.6.3.2 Multiplexer Control Signal FlowRefer to Figure 6-2. The exciter controls each multiplexer by four control lines: threeaddress lines and a latch. The address lines (0, 1, and 2) are binary signals with a total ofeight possible states. The address lines sequence through the eight states in about 360microseconds. As each state occurs, the latch line is toggled, selecting the analog inputcorresponding to that address state. The voltage present at the multiplexer common outputis the most recently latched analog input.6.4 Status DistributionRefer to Figure 6-1. The PA status outputs are supplied through the same DB15-typeconnector as the PA control inputs, which mates with J6 on the exciter/PA control. Twotypes of status outputs are supplied: multiplexed (mux) analog and PA fault.Analog Multiplexer TheoryThree analog multiplexers are located on the metering board. Each multiplexer re-ceives as many as eight analog inputs, at a sample voltage which represents a PA pa-rameter or status. Control lines from the exciter command the multiplexer to connect one of the inputs to a common output, which is measured by the exciter. The multi-plexer is switched quickly between the analog inputs, resulting in a multiplexed analog output.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160THEORY OF OPERATION Issue 1, Rev. C: 10/21/96Page: 6-6 Copyright © 1996 Glenayre Print Date: 12/17/966.4.1 Mux Analog Status Signal FlowMux analog status signals consist of dc voltages that represent a parameter or fault withinthe PA. These signals are generated by current detectors, power monitors, and meteringdividers, which supply a status voltage proportional to the level of parameter it is repre-senting, or the existence of the fault it is representing. Refer to Figure 6-2. These statusvoltages are applied to one of the three multiplexers located on the metering board. Themultiplexers route the appropriate status voltage to the exciter in the form of mux analog.Table 6-1 lists all status voltage nomenclature, the multiplexer that routes that voltage, andthe control address that directs the multiplexer to route that voltage.6.4.2 PA Fault Signal FlowA PA fault signal is activated when a reflected power threshold is exceeded by the PA1 orPA2 board. Refer to Figure 6-2. A portion of the PA1 board and PA2 board reflected powerstatus voltages are applied to a comparator and switching circuit. When either statusexceeds a voltage representing about 20 watts, the switch is activated. The switch appliesa PA fault to the exciter, which shuts down the transmitter. Table 6-1 Multiplexer Analog Status Inputsaddr multiplexer 1 multiplexer 2 multiplexer 3000 PA1-A current preamp current total forward power 001 PA1-B current IPA current (no input)010 PA2-A current driver-1 current IPA forward power011 PA2-B current driver-2 current IPA reflected power100 PA1 forward power (no input) +25V voltage level 101 reflected power (no input) +13.5V voltage level110 PA2 forward power exciter output fault +5V voltage level111 PA2 reflected power AGC voltage level PA heat sink temp
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 THEORY OF OPERATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 6-7 v0229.hglFigure 6-1 250-Watt PA Interconnection Diagram
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160THEORY OF OPERATION Issue 1, Rev. C: 10/21/96Page: 6-8 Copyright © 1996 Glenayre Print Date: 12/17/96v0203.hglFigure 6-2 250-Watt PA Functional Diagram
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 THEORY OF OPERATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 6-9 v0202l.hglFigure 6-3 250-Watt PA Detailed Functional Diagram
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160THEORY OF OPERATION Issue 1, Rev. C: 10/21/96Page: 6-10 Copyright © 1996 Glenayre Print Date: 12/17/96v0202r.hgl250-Watt PA Detailed Functional Diagram
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 THEORY OF OPERATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 6-11 v0204l.hglFigure 6-4 Metering Board Functional Diagram
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160THEORY OF OPERATION Issue 1, Rev. C: 10/21/96Page: 6-12 Copyright © 1996 Glenayre Print Date: 12/17/960204r.hglMetering Board Functional Diagram
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 MAINTENANCEPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 7-1 7 MAINTENANCERefer to the system and VDT manuals.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160MAINTENANCE Issue 1, Rev. C: 10/21/96Page: 7-2 Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 CHECKOUT AND TROUBLESHOOTINGPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 8-1 8 CHECKOUT AND TROUBLESHOOTINGRefer to the system and VDT manuals.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160CHECKOUT AND TROUBLESHOOTING Issue 1, Rev. C: 10/21/96Page: 8-2 Copyright © 1996 Glenayre Print Date: 12/17/96
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 REMOVAL AND REINSTALLATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 9-1 9 REMOVAL AND REINSTALLATION9.1 PA Chassis Removal and ReinstallationFigure 9-1 shows details of removing and reinstalling the chassis. Calibration of forwardand reflected power is required after reinstallation. 9.2 PA RF Module Removal and ReinstallationFigure 9-2 shows details of removing and reinstalling PA RF modules.9.3 Metering Board Removal and ReinstallationFigure 9-3 shows details of removing and reinstalling the metering board.
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160REMOVAL AND REINSTALLATION Issue 1, Rev. C: 10/21/96Page: 9-2 Copyright © 1996 Glenayre Print Date: 12/17/96v0223.hglFigure 9-1 PA Removal and Reinstalllation
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 REMOVAL AND REINSTALLATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 9-3
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160REMOVAL AND REINSTALLATION Issue 1, Rev. C: 10/21/96Page: 9-4 Copyright © 1996 Glenayre Print Date: 12/17/96v0225.hglFigure 9-2 PA RF Module Removal and Reinstallation
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 REMOVAL AND REINSTALLATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 9-5 Figure 9-2 PA RF Module Removal and Reinstallation (continued)
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160REMOVAL AND REINSTALLATION Issue 1, Rev. C: 10/21/96Page: 9-6 Copyright © 1996 Glenayre Print Date: 12/17/96v0228.hglFigure 9-3 Metering Board Removal and Reinstallation
Glenayre Document Number: 9110.00160 250-Watt Gold Line Power AmplifierIssue 1, Rev. C: 10/21/96 REMOVAL AND REINSTALLATIONPrint Date: 12/17/96 Copyright © 1996 Glenayre Page: 9-7 v0227.hglFigure 9-3 Metering Board Removal and Reinstallation (continued)
250-Watt Gold Line Power Amplifier Glenayre Document Number: 9110.00160REMOVAL AND REINSTALLATION Issue 1, Rev. C: 10/21/96Page: 9-8 Copyright © 1996 Glenayre Print Date: 12/17/96

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