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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IC DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OUTLINE DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,12
SCHEMATIC DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,12
LOW PASS FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7,13
LBI-38674E
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Ericsson Inc.
Private Radio Systems
Mountain View Road
Lynchburg, Virginia 24502
1-800-528-7711 (Outside USA, 804-528-7711)
Printed in U.S.A.
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Table of Contents
Troubleshooting
Related Manuals for Ericsson 19D902797G3
Summary of Contents for Ericsson 19D902797G3
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Page 1: Table Of Contents
LBI-38674E 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-38674 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-38674 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-38674 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-38674 POWER AMPLIFIER ASSEMBLY 19D902797G3, G6, G7, G8, G9, G10 & G11 (19D902797 Sh. 3, Rev. 6) - Page 7 ASSEMBLY DIAGRAM LBI-38674 POWER AMPLIFIER ASSEMBLY COVER ASSEMBLY 19D902797G3, G6, G7, G8, G9, G10 & G11 19B801659G3 (19D902797 Sh. 2, Rev. 6) (19B801659, Sh. 2, Rev. 3)
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Page 8: Assembly Diagram 5
ASSEMBLY DIAGRAMS LBI-38674 LOW PASS FILTER MODULE 19D902856G3 (19D902856 Sh. 1, Rev. 0) -
Page 9: Parts List
DESCRIPTION SYMBOL PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION 110 WATT UHF POWER AMPLIFIER 19D902797G3 90 WATT UHF POWER AMPLFIER 19D902797G6, G7 Mica/teflon: 43 pF ±2%, 100 VDCW. Mica/teflon: 33 pF ±2%, 100 VDCW. 19A700006P57 19A700006P48 & G9 - G11 Porcelain: 8.2 pF ±5%, 500 VDCW;... - Page 10 PARTS LIST LBI-38674 SYMBOL PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION SYMBOL PART NO. DESCRIPTION Wirewound: 2.2 ohms ±10%, 2 w. 19A700050P17 19A705457P3 PA module: 470-512 MHz; sim to 19A701091G1 Coil (Used in G6, G7, G8 and G11). 19A149969P3 Shield.
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Page 11: Production Changes
Refer to the Parts List for the descriptions of parts affected by these revisions. PRODUCTION CHANGES REV. A POWER AMPLIFIER 19D902797G3 POWER AMPLIFIER BOARD 19D902794G3 To make unit ETS compliant. C17, C44, C45 were 19A702052P33. C50 was 0.068 µF (19A702052P24). -
Page 12: Ic Data
SCHEMATIC DIAGRAM LBI-38674 POWER AMPLIFIER ASSEMBLY 19D902797G3, G6, G7, G8, G9, G10 & G11 (19D903622 Sh. 1, Rev. 10) -
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. 10) - Page 14 SCHEMATIC DIAGRAM & IC DATA LBI-38674 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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