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MAINTENANCE MANUAL FOR
450-470 MHz, 110 WATT POWER AMPLIFIER
19D902797G3
425-450 MHz, 90 WATT POWER AMPLIFIER
19D902797G7
403-425 MHz, 90 WATT POWER AMPLIFIER
19D902797G6
380-400 MHz, 75 WATT POWER AMPLIFIER
19D902797G8
470-494 MHz, 90 WATT POWER AMPLIFIER
19D902797G9
492-512 MHz, 90 WATT POWER AMPLIFIER
19D902797G10
410-430 MHz, 90 WATT POWER AMPLIFIER
19D902797G11
TABLE OF CONTENTS
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CIRCUIT ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exciter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Small Signal Gain Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Low Level Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Amplifier Finals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Theory of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal Interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,3
BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
POWER AMPLIFIER READINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ASSEMBLY DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5,6,7
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PRODUCTION CHANGES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9,10
IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OUTLINE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,12
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,12
LOW PASS FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,13
LBI-38674F
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Ericsson Inc.
Private Radio Systems
Mountain View Road
Lynchburg, Virginia 24502
1-800-592-7711 (Outside USA, 804-592-7711)
Printed in U.S.A.
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Table of Contents
Troubleshooting
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Summary of Contents for Ericsson 19D902797G3
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Page 1: Table Of Contents
LBI-38674F MAINTENANCE MANUAL FOR 450-470 MHz, 110 WATT POWER AMPLIFIER 19D902797G3 425-450 MHz, 90 WATT POWER AMPLIFIER 19D902797G7 403-425 MHz, 90 WATT POWER AMPLIFIER 19D902797G6 380-400 MHz, 75 WATT POWER AMPLIFIER 19D902797G8 470-494 MHz, 90 WATT POWER AMPLIFIER 19D902797G9 492-512 MHz, 90 WATT POWER AMPLIFIER... -
Page 2: Description
The signal from the Small Signal Gain stage, typically Power Control circuitry. input to the Exciter through a 10 dB resistive pad (R1, R2, and 26 dBm (400 mW), is input into the LLA. Under typical Copyright © July 1992, Ericsson GE Mobile Communications Inc. -
Page 3: Power Control
LBI-38674F The stripline directional coupler samples the output Zero volts on this line, when the PA is keyed, indicates the of supplying 5 volts at 1.0 mA. The appropriate key sequence POWER CONTROL power and produces a voltage, Vf, proportional to the for- forward power is cutback. -
Page 4: Power Amplifier Readings
LBI-38674F UHF POWER AMPLIFIER TYPICAL VOLTAGE READINGS TROUBLESHOOTING GUIDE (cont’d) (50 ohm, room temperature, 13.4 Vdc supply voltage, and rated output) Group High SYMPTOM AREAS TO CHECK INDICATIONS Frequency 450 MHZ 460 MHZ 470 MHZ Low power at PA output port Low RF input to PA from TX Power should be a minimum of 10 403 MHZ... - Page 5 LBI-38674F RATED POWER FOR MASTR III UHF BASE STATION FREQUENCY STANDARD ADJUSTABLE WITH WITH WITH DUPLEXER RANGE DUPLEXER ISOLATOR AND ISOLATOR @J104 450-470 110W 65-130W 100W 425-450 55-110W 403-425 55-110W 380-400 45-90W 410-430 55-110W 470-494 55-110W 492-512 55-110W...
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Page 6: Assembly Diagram
ASSEMBLY DIAGRAM LBI-38674F POWER AMPLIFIER ASSEMBLY 19D902797G3, G6, G7, G8, G9, G10 & G11 (19D902797 Sh. 3, Rev. 10) - Page 7 ASSEMBLY DIAGRAM LBI-38674F POWER AMPLIFIER ASSEMBLY COVER ASSEMBLY 19D902797G3, G6, G7, G8, G9, G10 & G11 19B801659G3 (19D902797 Sh. 2, Rev. 10) (19B801659, Sh. 2, Rev. 3)
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Page 8: Assembly Diagram 5
ASSEMBLY DIAGRAMS LBI-38674F LOW PASS FILTER MODULE 19D902856G3 (19D902856 Sh. 1, Rev. 0) -
Page 9: Parts List
PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION 110 WATT UHF POWER AMPLIFIER 19D902797G3 90 WATT UHF POWER AMPLFIER 19D902797G6, G7 & G9 - G11 Mica/teflon: 33 pF ±2%, 100 VDCW. (Used in G3). Porcelain: 15 pF ±5pF, 500 VDCW; simto 150JT500X. -
Page 10: Production Changes
- - - - - - - - - - - - - - - - CABLES - - - - - - - - - - - - - - - - Metal film: 21.5K ohms ±1%, 200 VDCW, 1/8 w. 19A702931P333 LOW PASS FILTER MODULE REV. A POWER AMPLIFIER 19D902797G3 Metal film: 9090 ohms ±1%, 200 VDCW, 1/8 w. 19B801529G4 RF Input Cable. Includes the following: 19A702931P293 19D902856G3 &... -
Page 11: Outline Diagram
PRODUCTION CHANGES AND OUTLINE DIAGRAM LBI-38674F PRODUCTION CHANGES - CONT. COMPONENT SIDE REV. C POWER AMPLIFIER 19D902797G3 POWER AMPLIFIER BOARD 19D902794G3 To update PWB for new band splits. REV. D POWER AMPLIFIER 19D902797G3 POWER AMPLIFIER BOARD 19D902794G3 To update PWB for new band splits and add power monitor circuitry. -
Page 12: Ic Data
SCHEMATIC DIAGRAM LBI-38674F POWER AMPLIFIER ASSEMBLY 19D902797G3, G6, G7, G8, G9, G10 & G11 (19D903622 Sh. 1, Rev. 11) -
Page 13: Low Pass Filter
1200 pF 3 turn 3 turn 3 turn 3 turn 3 turn 1 turn 3 turn LOW PASS FILTER MODULE POWER AMPLIFIER ASSEMBLY 19D902856G3 19D902797G3, G6, G7, G8, G9,G10 & G11 (19D903623 Sh.1, Rev. 1) (19D903622 Sh.2 Rev. 11) - Page 14 SCHEMATIC DIAGRAM & IC DATA LBI-38674F U100 19A705457P1, P2 AND P4 19A705532P2 PA Amplifier Module Voltage Regulator 344A3907P1 MMIC Amplifier 19A701789P4 Quad Op-Amp LOW PASS FILTER MODULE 470 - 512 MHz 19D902856G9 (19B804157, Rev. 0)
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