Table of Contents
Advertisement
Quick Links
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
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
Advertisement
Table of Contents
Related Manuals for M/A-Com 19D902797G3
Summary of Contents for M/A-Com 19D902797G3
-
Page 1: Table Of Contents
PARTS LIST ................................14 PRODUCTION CHANGES........................... 23 IC DATA ................................26 ASSEMBLY DIAGRAMS............................. 29 POWER AMPLIFIER 19D902797G3 & G6 THROUGH G11................29 COVER ASSEMBLY 19B801659G3 ........................ 30 ASSEMBLY, OUTLINE & SCHEMATIC DIAGRAMS FOR LOW PASS FILTER MODULE 19D902856G331 10.0 OUTLINE DIAGRAM............................32 10.1... - Page 2 This manual is published by M/A-COM, Inc., without any warranty. Improvements and changes to this manual necessitated by typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be made by M/A-COM, Inc., at any time and without notice. Such changes will be incorportated into new editions of this manual. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose, without the express written permission of M/A-COM, Inc.
-
Page 3: Specifications
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) 65 watts - 130 watts (G3) -
Page 4: Description
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
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. Figure 1 is a block diagram showing the signal flow within the Power Amplifier Assembly. -
Page 6: Power Amplifier Finals (Q2 & Q3)
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
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. Zero volts on the PA key line causes the PA to unkey. -
Page 8: Signal Interface
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 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
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 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 POWER SENSE J201-1...
- Page 12 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 2 - 3 Volts 2 - 3 Volts...
-
Page 13: Low Pass Filter Test Procedure
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 55-110W 492-512 55-110W LOW PASS FILTER TEST PROCEDURE This procedure is used to measure Insertion Loss and Harmonic Attenuation of Low Pass Filters 19D902856G3 and G9. -
Page 14: Parts List
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 Feedthru: 0.01µF +100-0%, 500 VDCW;... - Page 15 PARTS LIST Symbol Part Number Description Porcelain: 8.2 pF ±5%, 500 VDCW; sim to 8R2CT500X. (Used in G7). 344A3126P11 344A3126P15 Porcelain: 12 pF ±5%, 500 VDCW; sim to 120JT500X. (Used in G8). 344A3126P11 Porcelain: 8.2 pF ±5%, 500 VDCW; sim to 8R2CT500X. (Used in G3, G9, G10).
- Page 16 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). 19A700006P55 Mica/teflon: 27 pF ±2%, 100 VDCW. (Used in G9 and G10). 19A700006P50 Mica/teflon: 39 pF ±2%, 100 VDCW.
- Page 17 PARTS LIST Symbol Part Number Description Mica/teflon: 33 pF ±2%, 100 VDCW. (Used in G9 and G10). 19A700006P48 19A700006P59 Mica/teflon: 51 ohms ±2%, 100 VDCW. (Used in G6, G8, and G11). 19A700006P57 Mica/teflon: 43 pF ±2%, 100 VDCW. (Used in G7). 19A700006P50 Mica/teflon: 39 pF ±2%, 100 VDCW.
- Page 18 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; sim to Toko 380NB-39nM. 19C320617P17 Coil.
- Page 19 PARTS LIST Symbol Part Number Description Wirewound: 2.2 ohms ±10%, 2 w. (Used in G3, G9, and G10). 19A700050P17 19B800607P682 Metal film: 6.8K ohms ±5%, 1/8 w. 19B801486P100 Metal film: 10 ohms ±5%, 1/2 w. 19A700050P17 Wirewound: 2.2 ohms ±10%, 2 w. (Used in G3, G9). 19B801486P101 Metal film: 100 ohms ±5%, 1/2 w.
- Page 20 PARTS LIST Symbol Part Number Description - - - - - - - - - - - - - - RESISTORS - - - - - - - - - - - - - - Power: 100 ohm ±5%, 40 w. 19A143832P6 - - - - - - - - - - -INTEGRATED CIRCUITS - - - - - - - - - - - - 19A705457P2...
- Page 21 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 Washer. 19A149969P3 Shield.
- Page 22 PARTS LIST Symbol Part Number Description - - - - - - INDUCTORS - - - - - - 19C320618P7 Coil. 19B227929P1 Coil thru UHF FILTER BOARD 19D902853G9 - - - - - - - - - - - - CAPACITORS - - - - - - - - - - - - Mica: 4.7 pF ±10%, 100 VDCW.
-
Page 23: Production Changes
The revision stamped on the unit includes all previous revisions. Refer to the Parts List for the descriptions of parts affected by these revisions. REV. A - POWER AMPLIFIER 19D902797G3 REV. A - POWER AMPLIFIER BOARD 19D902794G3 To make unit ETS compliant. - Page 24 REV. A - POWER AMPLIFIER BOARD 19D902794G8, G9, G11 REV. B - POWER AMPLIFIER 19D902797G6, G7 REV. B - POWER AMPLIFIER BOARD 19D902794G6, G7 REV. E - POWER AMPLIFIER 19D902797G3 REV. E - POWER AMPLIFIER BOARD 19D902794G3 To update PWB to new band splits for 492-512 MHz.
- Page 25 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. C - POWER AMPLIFIER BOARD 19D902794G7 REV.
-
Page 26: Ic Data
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 IC DATA MMIC Amplifier 344A3907P1 LBI-38674L...
- Page 28 (Intentionally Left Blank) LBI-38674L...
-
Page 29: Assembly Diagrams
ASSEMBLY DIAGRAM 8.0 ASSEMBLY DIAGRAMS POWER AMPLIFIER 19D902797G3 & G6 THROUGH G11 (19D902797, Sh. 3, Rev. 16) LBI-38674L... -
Page 30: Cover Assembly 19B801659G3
ASSEMBLY DIAGRAM COVER ASSEMBLY 19B801659G3 (19D902797, Sh. 2, Rev. 16) (19B801659, Sh. 2, Rev. 3) LBI-38674L... - Page 31 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
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
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
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 (Intentionally Left Blank) LBI-38674L...
- Page 36 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.
Need help?
Do you have a question about the 19D902797G3 and is the answer not in the manual?
Questions and answers