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Tyco Electronics M/A-Com 19D902797G3 Maintenance Manual

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450-470 MHz, 110 WATT POWER AMPLIFIER
403-425 MHz,
425-450 MHz,
380-400 MHz,
470-494 MHz,
492-512 MHz,
410-430 MHz,
Section
1.0
SPECIFICATIONS................................................................................................................................................... 3
2.0
DESCRIPTION ........................................................................................................................................................ 4
3.0
CIRCUIT ANALYSIS.............................................................................................................................................. 5
3.1
POWER AMPLIFIER .......................................................................................................................................... 5
3.1.1
Exciter (U7) .................................................................................................................................................. 5
3.1.2
Small Signal Gain Stage ............................................................................................................................... 5
3.1.3
Low Level Amplifier (U1)............................................................................................................................ 5
3.1.4
Driver (Q1) ................................................................................................................................................... 5
3.1.5
Power Amplifier Finals (Q2 & Q3) .............................................................................................................. 6
3.1.6
Low Pass Filter ............................................................................................................................................. 6
3.2
POWER CONTROL ............................................................................................................................................ 7
3.2.1
Keying and Unkeying the PA ....................................................................................................................... 7
3.2.2
PA Output Power Set.................................................................................................................................... 7
3.2.3
PA Protection................................................................................................................................................ 7
3.2.4
Theory of Operation...................................................................................................................................... 7
3.2.5
Signal Interface............................................................................................................................................. 8
4.0
TROUBLESHOOTING ......................................................................................................................................... 10
4.1
TROUBLESHOOTING GUIDE ........................................................................................................................ 10
4.2
LOW PASS FILTER TEST PROCEDURE ....................................................................................................... 13
4.2.1
Recommemded Test Equipment ................................................................................................................. 13
4.2.2
Test Set-Up and Procedure ......................................................................................................................... 13
5.0
PARTS LIST .......................................................................................................................................................... 14
6.0
PRODUCTION CHANGES................................................................................................................................... 23
7.0
IC DATA ................................................................................................................................................................ 26
8.0
ASSEMBLY DIAGRAMS..................................................................................................................................... 29
8.1
POWER AMPLIFIER 19D902797G3 & G6 THROUGH G11.......................................................................... 29
8.2
COVER ASSEMBLY 19B801659G3 ................................................................................................................ 30
9.0
ASSEMBLY, OUTLINE & SCHEMATIC DIAGRAMS FOR LOW PASS FILTER MODULE 19D902856G331
10.0
OUTLINE DIAGRAM........................................................................................................................................... 32
10.1
POWER AMPLIFIER BOARD A1 19D902856G3, G6, G7, G8, G9, G10 & G11........................................... 32
11.0
SCHEMATIC DIAGRAM ..................................................................................................................................... 33
11.1
POWER AMPLIFIER ASSEMBLY 19D902 797G3 & G6 THROUGH G11 .................................................. 33
12.0
All manuals and user guides at all-guides.com
90 WATT POWER AMPLIFIER
90 WATT POWER AMPLIFIER
75 WATT POWER AMPLIFIER
90 WATT POWER AMPLIFIER
90 WATT POWER AMPLIFIER
90 WATT POWER AMPLIFIER

TABLE OF CONTENTS

Maintenance Manual
19D902797G3
19D902797G6
19D902797G7
19D902797G8
19D902797G9
19D902797G10
19D902797G11
LBI-38674L
Page

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Summary of Contents for Tyco Electronics M/A-Com 19D902797G3

  • Page 1: Table Of Contents

    Maintenance Manual All manuals and user guides at all-guides.com LBI-38674L 450-470 MHz, 110 WATT POWER AMPLIFIER 19D902797G3 403-425 MHz, 90 WATT POWER AMPLIFIER 19D902797G6 425-450 MHz, 90 WATT POWER AMPLIFIER 19D902797G7 380-400 MHz, 75 WATT POWER AMPLIFIER 19D902797G8 470-494 MHz, 90 WATT POWER AMPLIFIER 19D902797G9 492-512 MHz,...
  • Page 2 All manuals and user guides at all-guides.com NOTE Repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier. Any repairs, alterations or substitution of recommended parts made by the user to this equipment not approved by the manufacture could void the user’s authority to operate the equipment in addition to the manufacture’s warranty.

  • Page 3: Specifications

    All manuals and user guides at all-guides.com SPECIFICATIONS 1.0 SPECIFICATIONS ITEM SPECIFICATION FREQUENCY 450 MHz - 470 MHz (G3) 403 MHz - 425 MHz (G6) 425 MHz - 450 MHz (G7) 380 MHz - 400 MHz (G8) 470 MHz - 494 MHz (G9) 492 MHz - 512 MHz (G10) 410 MHz - 430 MHz (G11) OUTPUT POWER (RF)

  • Page 4: Description

    All manuals and user guides at all-guides.com DESCRIPTION 2.0 DESCRIPTION The UHF Power Amplifier Assembly is a wide band RF power amplifier operating over the 380-400, 410-430, 403-425, 425-450, 450-470, 470-494, and 492-512 MHz range without tuning. Its main function is to amplify the 10 mW FM signal from the Transmitter Synthesizer to the rated RF output at the antenna port.

  • Page 5: Circuit Analysis

    All manuals and user guides at all-guides.com CIRCUIT ANALYSIS 3.0 CIRCUIT ANALYSIS POWER AMPLIFIER The power amplifier section of the PA Board consists of an Exciter, a Small Signal Gain Stage, a Low Level Amplifier, a Driver, and the Power Amplifier Finals. All these gain stages have an input and output impedance of 50 ohms.

  • Page 6: Power Amplifier Finals (Q2 & Q3)

    All manuals and user guides at all-guides.com CIRCUIT ANALYSIS 3.1.5 Power Amplifier Finals (Q2 & Q3) Each of the Power Amplifier final devices is capable of producing 5 to 6 dB of gain. The output signal from the Splitter is impedance-matched to each of the finals. Under optimum conditions each final amplifies the input signal to between 50 and 70 watts output power (depending on band split).

  • Page 7: Power Control

    All manuals and user guides at all-guides.com CIRCUIT ANALYSIS POWER CONTROL The Power Control circuitry performs three basic functions. It keys and unkeys the PA, sets the PA output power, and protects the PA against adverse conditions. 3.2.1 Keying and Unkeying the PA To key the PA, the digital controller places 5 volts on the PA key line, J201-2.

  • Page 8: Signal Interface

    All manuals and user guides at all-guides.com CIRCUIT ANALYSIS The microstrip directional coupler samples the output power and produces a voltage, Vf, proportional to the forward output power. The power control compares the forward voltage, Vf, to a reference voltage at U3. The output of U3 controls the current flow thru Q5 and the output of Q203.
  • Page 9 All manuals and user guides at all-guides.com CIRCUIT ANALYSIS 3.2.5.2 PA Key (Interface Connector pin 2) This line is used to key and unkey the PA. UNKEY = 0 volt and KEY = 5 volts. The driver of this line must be capable of supplying 5 volts at 1.0 mA. The appropriate key sequence requires RF from the transmit synthesizer be input to the PA before the KEY line is energized.

  • Page 10: Troubleshooting

    All manuals and user guides at all-guides.com TROUBLESHOOTING TROUBLESHOOTING TROUBLESHOOTING GUIDE SYMPTOM AREAS TO CHECK INDICATIONS 1. No Power or low Power at 1. Measure the transmitter output The presence of power at this port Antenna Port. power before the duplexer or is an indication of a defective antenna switch (for simplex duplexer, switch, or cables.
  • Page 11 All manuals and user guides at all-guides.com TROUBLESHOOTING Table 1 - UHF Power Amplifier Voltage Chart PARAMETER REFERENCE READINGS SYMBOL (Volts DC) (50 ohm, -30°C to +60°C) SUPPLY VOLTAGE 13.4 V ±20% CONTROL VOLTAGE Vct1 0 - 12 V FORWARD VOLTAGE 3 - 7 V REVERSE VOLTAGE 2 - 6 V...
  • Page 12 All manuals and user guides at all-guides.com TROUBLESHOOTING Continued Group High 2 - 3 Volts 2 - 3 Volts 2 - 3 Volts Vr (Volts DC) 2 - 3 Volts 2 - 3 Volts 2 - 3 Volts 2 - 3 Volts 2 - 3 Volts 2 - 3 Volts 2 - 3 Volts...

  • Page 13: Low Pass Filter Test Procedure

    All manuals and user guides at all-guides.com TROUBLESHOOTING Table 3 - Rated Power For MASTR III UHF Base Station WITH FREQUENCY STANDARD ADJUSTABLE WITH WITH DUPLEXER RANGE@J104 DUPLEXER ISOLATOR ISOLATOR 450-470 110W 65-130W 100W 425-450 55-110W 403-425 55-110W 380-400 45-90W 410-430 55-110W 470-494...

  • Page 14: Parts List

    All manuals and user guides at all-guides.com PARTS LIST 5.0 PARTS LIST 110-WATT UHF POWER AMPLIFIER 19D902797G3 90-WATT UHF POWER AMPLIFIER 19D902797G6, G7 & G9-G11 75-WATT UHF POWER AMPLIFIER 19D902797G8 Issue 8 Symbol Part Number Description ASSEMBLIES POWER AMPLIFIER BOARD 19D902794G3, G6 - G11 - - - - - - - - - - CAPACITORS - - - - - - - - - 19A116708P2...
  • Page 15 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description 344A3126P11 Porcelain: 8.2 pF ±5%, 500 VDCW; sim to 8R2CT500X. (Used in G7). 344A3126P15 Porcelain: 12 pF ±5%, 500 VDCW; sim to 120JT500X. (Used in G8). Porcelain: 8.2 pF ±5%, 500 VDCW; sim to 8R2CT500X. (Used in G3, G9, 344A3126P11 G10).
  • Page 16 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description 344A3126P5 Porcelain:4.7 pF ±0.25%, 500 VDCW; sim to 4R7CT500X. (Used in G9, G10). 19A700006P58 Mica/teflon: 47 pF ±2%, 100 VDCW. (Used in G8). Mica/teflon: 27 pF ±2%, 100 VDCW. (Used in G9 and G10). 19A700006P55 19A700006P50 Mica/teflon: 39 pF ±2%, 100 VDCW.
  • Page 17 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description 19A700006P48 Mica/teflon: 33 pF ±2%, 100 VDCW. (Used in G9 and G10). 19A700006P59 Mica/teflon: 51 ohms ±2%, 100 VDCW. (Used in G6, G8, and G11). Mica/teflon: 43 pF ±2%, 100 VDCW. (Used in G7). 19A700006P57 19A700006P50 Mica/teflon: 39 pF ±2%, 100 VDCW.
  • Page 18 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description 19A701091G1 Coil (Used in G6, G7, G8 and G11). 19C320617P10 Coil (Used in G6, G7, G8, G10 and G11). 19A705470P4 Coil, Fixed: 15 nH; sim to Toko 380NB-15nM. 19A705470P8 Coil, Fixed: 39 nH;...
  • Page 19 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description 19A700050P17 Wirewound: 2.2 ohms ±10%, 2 w. (Used in G3, G9, and G10). 19B800607P682 Metal film: 6.8K ohms ±5%, 1/8 w. Metal film: 10 ohms ±5%, 1/2 w. 19B801486P100 19A700050P17 Wirewound: 2.2 ohms ±10%, 2 w.
  • Page 20 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description - - - - - - - - - - - - - - RESISTORS - - - - - - - - - - - - - - Power: 100 ohm ±5%, 40 w.
  • Page 21 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description 19A700033P6 Loackwasher, external tooth, M3.5. N405P5B6 Lockwasher. 19A701312P4 Flatwasher: 3.2 ID. 19A702381P408 Tap screw, TORX Drive, M3-0.5 x 8. 19A705106P1 Resistor Spacer. COVER 19B801659G3 19D902421P1 Power Amplifier Cover. 19A702381P522 Screw, thread forming: 19A701365P4...
  • Page 22 All manuals and user guides at all-guides.com PARTS LIST Symbol Part Number Description - - - - - - INDUCTORS - - - - - - 19C320618P7 Coil. 19B227929P1 Coil thru UHF FILTER BOARD 19D902853G9 - - - - - - - - - - - - CAPACITORS - - - - - - - - - - - - 19A700006P1 Mica: 4.7 pF ±10%, 100 VDCW.

  • Page 23: Production Changes

    All manuals and user guides at all-guides.com PRODUCTION CHANGES 6.0 PRODUCTION CHANGES Changes in the equipment to improve performance or to simplify circuits are identified by a "Revision Letter" which is stamped after the model number of the unit. The revision stamped on the unit includes all previous revisions. Refer to the Parts List for the descriptions of parts affected by these revisions.
  • Page 24 All manuals and user guides at all-guides.com PRODUCTION CHANGES REV. A - POWER AMPLIFIER 19D902797G7 REV. A - POWER AMPLIFIER BOARD 19D902794G7 To update PWB to new band splits and add power monitor circuitry. Added dual operational amplifier U2 Added capacitor C48. Added resistors R54, R53, R55.
  • Page 25 All manuals and user guides at all-guides.com PRODUCTION CHANGES REV. G - POWER AMPLIFIER 19D902797G9 REV. G - POWER AMPLIFIER 19D902797G10 REV. G - POWER AMPLIFIER 19D902797G11 REV. G - POWER AMPLIFIER BOARD 19D902794G3 REV. C - POWER AMPLIFIER BOARD 19D902794G6 REV.

  • Page 26: Ic Data

    All manuals and user guides at all-guides.com IC DATA 7.0 IC DATA 19A705457P1, P2 AND P4 PA Amplifier Module U100 19A705532P2 Voltage Regulator 19A701789P4 Quad Op-Amp LBI-38674L...
  • Page 27 All manuals and user guides at all-guides.com IC DATA MMIC Amplifier 344A3907P1 LBI-38674L...
  • Page 28 All manuals and user guides at all-guides.com (Intentionally Left Blank) LBI-38674L...

  • Page 29: Assembly Diagrams

    All manuals and user guides at all-guides.com ASSEMBLY DIAGRAM 8.0 ASSEMBLY DIAGRAMS POWER AMPLIFIER 19D902797G3 & G6 THROUGH G11 (19D902797, Sh. 3, Rev. 16) LBI-38674L...

  • Page 30: Cover Assembly 19B801659G3

    All manuals and user guides at all-guides.com ASSEMBLY DIAGRAM COVER ASSEMBLY 19B801659G3 (19D902797, Sh. 2, Rev. 16) (19B801659, Sh. 2, Rev. 3) LBI-38674L...
  • Page 31 All manuals and user guides at all-guides.com ASSEMBLY, OUTLINE & SCHEMATIC DIAGRAM 9.0 ASSEMBLY, OUTLINE & SCHEMATIC DIAGRAMS FOR LOW PASS FILTER MODULE 19D902856G3 COMPONENT SIDE (19D902853, Sh. 2, Rev (19D903623, Sh. 1, Rev. 1) (19D902856, Sh. 1, Rev. 1) LBI-38674L...

  • Page 32: Outline Diagram

    All manuals and user guides at all-guides.com OUTLINE DIAGRAM 10.0 OUTLINE DIAGRAM 10.1 POWER AMPLIFIER BOARD A1 19D902856G3, G6, G7, G8, G9, G10 & G11 Lead Identification For Q7 used in G3 (19D902794 Sh. 2, Rev. 21) LBI-38674L...

  • Page 33: Schematic Diagram

    All manuals and user guides at all-guides.com SCHEMATIC DIAGRAM 11.0 SCHEMATIC DIAGRAM 11.1 POWER AMPLIFIER ASSEMBLY 19D902 797G3 & G6 THROUGH G11 (19D903622, Sh. 1, Rev. 16) LBI-38674L...

  • Page 34: Outline & Schematic Diagram For 470-512 Mhz Low Pass Filter Module 19D902856G9

    All manuals and user guides at all-guides.com SCHEMATIC DIAGRAM 12.0 OUTLINE & SCHEMATIC DIAGRAM FOR 470-512 MHz LOW PASS FILTER MODULE 19D902856G9 COMPONENT SIDE (19D902853, Sh. 3, Rev. 3) (19B804157, Rev. 0) (19D903622, Sh. 2, Rev. 16) LBI-38674L...
  • Page 35 All manuals and user guides at all-guides.com (Intentionally Left Blank) LBI-38674L...
  • Page 36 All manuals and user guides at all-guides.com M/A-COM Wireless Systems 221 Jefferson Ridge Parkway Lynchburg, Virginia 24501 (Outside USA, 434-385-2400) Toll Free 800-528-7711 www.macom-wireless.com Printed in U.S.A.

This manual is also suitable for:

M/a-com 19d902797g6M/a-com 19d902797g7M/a-com 19d902797g8M/a-com 19d902797g9M/a-com 19d902797g10M/a-com 19d902797g11

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