31R2-2GRT-102-WA-1.pdf

TO 31R2-2GRT-102

NAVELEX 0967-LP-429-5010

TECHNICAL MANUAL

SERVICE AND CIRCUIT DIAGRAMS

RADIO TRANSMITTER

T-1108(V)/GRT-21(V) & T-1109(V)/GRT-22(V)

AND

RADIO FREQUENCY AMPLIFIER

AM-6154/GRT-21(V) & AM-6155/GRT-22(V)

(AN/GRT-21 AND AN/GRT-22)

DISCLOSURE NOTICE - This information is furnished upon the condition that it will not be released to another nation without the specific authority of the Department of the Air Force and Navy of the United States, that it will be used for military purposes only, that individual or corporate rights originating in the information, whether patented or not, will be respected, that the recipient will report promptly to the United States, any known or suspected compromise, and that the information will be provided substantially the same degree of security afforded it by the Department of Defense of the United States. Also, regardless of any other markings on the document, it will not be downgraded or declassified without written approval of the originating United States agency.

DISTRIBUTION STATEMENT B - Distribution authorized to U.S. Government Agencies only (Administrative or Operational Use) (1 August 1978).

Other requests for this document shall be referred to 406 SCMS/GULAC, Robins AFB, GA 31098. Questions concerning technical content shall be referred to WR-ALC/GRWBBC.

WARNING - This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C., Sec 2751, et seq.) or the Export Administration Act of 1979, as amended, Title 50, U.S.C., App. 2401, et seq. Violations of these export laws are subject to severe criminal penalties. Disseminate in accordance with provisions of DoD Directive 5230.25.

HANDLING AND DESTRUCTION NOTICE - Comply with distribution statement and destroy by any method that will prevent disclosure of contents or reconstruction of the document.

Published Under Authority of the Secretary of the Air Force and the Navy

1 AUGUST 1978 CHANGE 26 - 13 APRIL 2012

BASIC AND ALL CHANGES HAVE BEEN MERGED TO MAKE THIS A COMPLETE PUBLICATION.

LIST OF EFFECTIVE PAGES

*Zero in this column indicates an original page.

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Change . . . . 9. . . . . . . . . 1 April 1987 Change . . . . 10. . .18 September 1989 Change . . . . 11. . . . . . . . . 1 July 1991 Change . . . . 12. . . . . . 27 March 1992 Change . . . . 13. . . . 23 February 1993 Change . . . . 14. . . . .26 October 1993 Change . . . . 15. . . . 10 February 1995 Change . . . . 16. . . . . . 26 March 1996 Change . . . . 17. . .28 November 1997

Change . . . . 18 . . 28 November 1999 Change . . . . 19 . . . . . . . 31 July 2000 Change . . . . 20 . . . . . . . 15 May 2001 Change . . . . 21 . . . . . . 7 August 2001 Change . . . . 22 . . . 28 February 2003 Change . . . . 23 . . . . . . . 15 May 2006 Change . . . . 24 . . . . . . . 30 June 2006 Change . . . . 25 . . . . . . . 31 May 2007 Change . . . . 26 . . . . . . 13 April 2012

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Change 26 B/(C blank)

T.O. 31R2-2GRT-102

TABLE OF CONTENTS

Section/Para Page Section/Para Page

LIST OF ILLUSTRATIONS...................................... iii 2-37 VHF Cable Assembly ......................... 2-12 2-38 Tuneup and Test................................. 2-12

LIST OF TABLES........................................................v

IV PREPARATION FOR RESHIPMENT.................. 2-12

INTRODUCTION....................................................... vi 2-41 General ................................................ 2-12

CHAPTER 1. GENERAL CHAPTER 3. OPERATION.................................... 3-1

INFORMATION ....................................................... 1-1

1-1 Introduction .......................................... 1-1 I CONTROLS AND INDICATORS ........................... 3-1 1-2 Description and Purpose ...................... 1-1 3-2 General .................................................. 3-1 1-20 Leading Particulars.............................. 1-2 3-5 Interlocks............................................... 3-1 1-22 Capabilities and

II OPERATING INSTRUCTIONS ............................ 3-10Limitations.........................................1-2 3-6 Starting, Turning, Operat-1-24 Equipment Supplied............................. 1-2 ing and Stopping Procedure ...........3-101-26 Equipment Required but not 3-7 Pre-Operating Check........................3-10ASupplied .............................................1-2 3-8 Install Crystal..................................... 3-11

CHAPTER 2. INSTALLATION ............................. 2-1 3-9 Exciter Starting Procedure ................ 3-11 3-10 Exciter Tuning Procedure .................. 3-12

I INSTALLATION PLANNING................................. 2-1 3-11 Power Amplifier Starting 2-2 General .................................................. 2-1 Procedure .........................................3-18

3-12 Power Amplifier TuningII LOGISTICS .............................................................. 2-1 Procedure .........................................3-182-4 Receiving Data...................................... 2-1

3-13 System Check...................................... 3-222-6 Unpacking Data.................................... 2-2 3-14 Remote Operation............................... 3-222-8 Cable Requirements ............................. 2-2 3-15 A3 Keyer Card Adjustment ............... 3-22

III INSTALLATION PROCEDURES........................... 2-2 3-16 Stopping Procedure ............................ 3-22 2-10 Installation............................................ 2-2 3-17 G3 Oscillator Tuning 2-12 Exciter Only Operation ........................ 2-2 Procedure .........................................3-23 2-13 Exciter Mounting Brackets.................. 2-4 3-20 Oscillator-Multiplier Tun- 2-17 Input Power Connections..................... 2-6 ing Procedure...................................3-24 2-19 Exciter Strapping ................................. 2-6 3-21 Frequency Fine Tune ......................... 3-24 2-20 Power Amplifier Strapping.................. 2-6

III EMERGENCY OPERATION ................................ 3-252-21 Remote Input Connections................... 2-6 3-22 General ................................................ 3-252-23 Audio Input and Remote 3-24 Crystal Not Available......................... 3-25Keying Using Audio Lines ................2-6 3-25 AC Power Failure ............................... 3-262-24 Audio Input and Remote

Keying Using Line Ampli- CHAPTER 4. PRINCIPLES OF fier Module ........................................2-8 OPERATION ............................................................ 4-1

2-25 Local Input Connections ...................... 2-8 2-26 Carbon Microphone .............................. 2-8 I FUNCTIONAL SYSTEM OPERATION ................. 4-1 2-27 Dynamic Microphone............................ 2-8 4-2 General .................................................. 4-1 2-28 External DC Source.............................. 2-8 4-4 Functional Description......................... 4-1 2-29 Wide Band Modulation ...................... 2-11

II FUNCTIONAL OPERATION OF2-30 T/R Relay Control Line ...................... 2-11 ELECTRONIC CIRCUITS ...................................... 4-22-31 Special Keying Lines .......................... 2-11

4-9 General .................................................. 4-22-32 Installation of Optional 4-11 Oscillator A8 ......................................... 4-2AFCS A-3 Keyer Card.....................2-11 4-13 Crystal Oscillator.................................. 4-22-33 Inboard Monitor/Keyer 4-14 Buffer Amplifier ................................... 4-2(Optional) .........................................2-11 4-15 Oven....................................................... 4-22-34 Special Status Monitor 4-16 External Oscillator Input..................... 4-2Outputs with Inboard 4-17 Crystal OscillatorMonitor/Keyer..................................2-11

(8004290G3) .......................................4-22-35 Installation of Optional 4-18 Buffer Amplifier ................................... 4-2AFCS A3 Keyer Card......................2-11 4-19 Oven....................................................... 4-22-36 Low Level Audio Input Op- 4-20 External Oscillator Input..................... 4-3tional Strapping...............................2-11

Change 20 i

TABLE OF CONTENTS - Continued

Section/Para Page Section/Para Page

4-21 Oscillator-Synthesizer .......................... 4-3 4-89 Control RF/Modulator A6 .................. 4-14 4-22 General .................................................. 4-2 4-94 Control, Thermal/Detector 4-23 Reference Generator............................. 4-3 Modulation Percent- 4-24 Divider/Control ..................................... 4-3 age/Coaxial Relay Con- 4-27 RF Generator ........................................ 4-4 trol/Keyer Inhibit A7.......................4-16 4-30 Phase Comparator ................................ 4-4 4-96 Relay Control Circuits........................ 4-16 4-32 Switching Regulator ............................. 4-5 4-99 Thermal Detector Circuit................... 4-17 4-33 Oscillator-Multiplier A8 4-100 Percent Modulation Circuit ............... 4-17

(G1) .....................................................4-5 4-101 Keyer, Control Transfer A2 ............... 4-17 4-34 Generator .............................................. 4-5 4-106 Keyer KY-668/GRT A3 ....................... 4-18 4-35 Oscillator-Multiplier ............................. 4-5 4-108 Tone Keying ........................................ 4-18 4-36 Buffer Amplifier ................................... 4-5 4-109 Voltage Keying..................................4-18A 4-37 Output Amplifier.................................. 4-5 4-110 Current Keying .................................4-18A 4-38 Metering Circuit ................................... 4-5 4-111 AFCS A3 Keyer Card .......................4-18A 4-40 External Input ...................................... 4-5 4-111C Inboard Monitor/Keyer 4-41 Doubler, Radio Frequency A3................................................... 4-18A

(VHF) A9 ............................................4-6 4-111D General Information.........................4-18A 4-44 Quadrupler (UHF) A9 .......................... 4-6 4-111E Keyer Control....................................4-18A 4-47 Quadrupler Revised.............................. 4-7 4-111F Monitor Sensor Interface .................4-18B 4-49 Driver/Power Amplifier 4-112 Power Supply PS1A3........................4-18B

(VHF) A10 ..........................................4-7 4-114 Regulator PS1A1 and 4-50 Driver/Power Amplifier PS1A2...............................................4-19

(VHF) A10 ..........................................4-7 4-115 Overcurrent Protect 4-53 Power Amplifier (VHF) Circuit ..............................................4-20

A10A2.................................................4-7 4-117 Battery Charging Circuit ................... 4-20 4-54 Driver (VHF) A10A1............................. 4-8 4-119 Power Amplifier.................................. 4-20 4-56 Power Amplifier (VHF) 4-121 Tuned Cavity A7................................. 4-21

A10A2.................................................4-8 4-123 Tuned Cavity (VHF) ........................... 4-21 4-57 Driver/Power Amplifier 4-125 Tuned Cavity (UHF)........................... 4-21

(UHF) A10..........................................4-9 4-127 Power Supply Control 4-59 Driver (UHF) A10A1 ............................ 4-9 Grid/Thermal Control/AC 4-61 Driver (UHF) A10A1 .......................... 4-10 Control A3........................................4-22 4-63 Power Amplifier (UHF) 4-128 AC Control .......................................... 4-22

A10A2...............................................4-10 4-130 Filament Supply ................................. 4-22 4-64 Power Amplifier (UHF) 4-131 Grid Supply......................................... 4-23

A10A2............................................ 4-10A 4-132 Thermal Control Circuits................... 4-23 4-65 Hybrid A10A6 ...................................4-10A 4-133 AC to AC Converter Source 4-66 Hybrid/Detector A10A5 ....................4-10A Voltage .............................................4-23 4-66A VHF/UHF Driver/Power 4-134 Power Supply Plate/Screen

Amplifier ....................................... 4-10A Grid A4.............................................4-23 4-67 Tunable Filter ..................................... 4-11 4-137 Converter AC to AC A2...................... 4-24 4-69 Low Pass Filter FL1........................... 4-11 4-140 Blower B1............................................ 4-24 4-71 Power Sensor DC1.............................. 4-12 4-142 Buffer Amplifi- 4-73 Switch, Coaxial Transmis- er/Multiplier, Electrical sion Line...........................................4-12 Instrument .......................................4-24 4-75 Amplifier Compressor, Au- 4-144 Buffer Amplifier ................................. 4-24 dio A1 ...............................................4-12 4-146 Tune-Operate Control ........................ 4-25 4-79 Line Amplifier A1............................... 4-13 4-148 High Voltage Switch........................... 4-26 4-81 Keying Circuit..................................... 4-13 4-150 Solid-State Vane Switch 4-83 Filter Amplifier/Detector (SSVS) ..............................................4-26

A4......................................................4-13 III FUNCTIONAL OPERATION OF4-85 Audio Filter Circuit ............................ 4-14

MECHANICAL ASSEMBLIES4-86 Audio Level Detector .......................... 4-14 (Not Applicable).................................... 4-264-87 Buffer Modulator A5 .......................... 4-14 ii Change 20

TABLE OF CONTENTS - Continued

Section/Para Page Section/Para Page

CHAPTER 5. MAINTENANCE.............................. 5-1

ORGANIZATIONAL/FIELD

MAINTENANCE ..................................................... 5-1

5-2 General............................................ 5-1 5-5 Fault Diagnosis and

Corrective Maintenance............... 5-4 5-6 General............................................ 5-4 5-10 Normal Meter Indications............... 5-4 5-11 Test Position Descriptions .............. 5-4 5-14 Fault Diagnosis .............................5-14 5-15 Module Removal and

Replacement ..............................5-16 5-16 Exciter...........................................5-16 5-17 Top Cover .....................................5-16 5-18 Oscillator ......................................5-17 5-19 Tunable Filter ...............................5-17 5-20 Driver/Power Amplifier................5-17 5-21 Regulator ......................................5-18 5-22 Power Sensor and Low

Pass Filter ..................................5-32 5-23 Printed Circuit Cards ....................5-32 5-24 Power Supply................................5-32 5-25 Power Amplifier ...........................5-32 5-26 Top Cover .....................................5-32 5-27 Power Supply Control

Grid/Thermal Control/AC Control ...................5-32

5-28 Buffer Amplifier/Multiplier, Electrical Instrument..................5-32

5-29 Blower ..........................................5-32 5-30 High Voltage Power Supply .........5-32 5-31 Tuned Cavity ................................5-32 5-32 Tuned Cavity Vacuum Tube.........5-33 5-33 Chassis Maintenance ....................5-33 5-34 Exciter Chassis .............................5-33 5-35 Switch, Coaxial.............................5-33 5-36 APC Drive Transistor Q1 .............5-33 5-37 Audio Input Transformer..............5-33 5-38 Carrier Level and Mod

Level Potentiometers ................5-33

5-39 Tune-Opr Switch .......................... 5-33 5-40 Front Panel Switches, Indicators, and Jacks.................. 5-33 5-41 Power Amplifier Chassis .............. 5-33 5-42 Alignment ..................................... 5-34 5-45 Power Supply Regulator............... 5-34 5-46 Amplifier Compressor .................. 5-34 5-47 Line Amplifier .............................. 5-34 5-48 Filter Amplifier/Detector........... 5-34A 5-49 Buffer Modulator ...................... 5-34A 5-50 Control RF/Modulator .............. 5-34A 5-51 Control Thermal/Detector

Modulation Percentage/ Coaxial Relay Control/ Keyer Inhibit........................... 5-34A

5-53 Buffer Amplifier/Multiplier, Electrical Instrument............... 5-34B

5-54 Oscillator Synthesizer................... 5-36 5-56 Special Maintenance

Instructions ............................. 5-36A 5-57 Synthesizer Switching

Regulator ................................ 5-36A 5-59 Installation Instruction for a

Solid-State Vane Switch in the AM-6154/GRT-21 or

AM-6155/GRT-22

Amplifiers............................... 5-36A

5-61 Inspection, Repair and Replacement of the Intermediate Tube, P/N 8004256G1, a Part of the AN/GRT-22/22 Tuned Cavity Assembly, P/N 8004230G1/G2 ................... 5-42

CHAPTER 6. CIRCUIT DIAGRAMS ............................ 6-1

6-1 INTRODUCTION.......................... 6-1

ALPHABETICAL INDEX......................................... Index 1

Change 23 iii

LIST OF ILLUSTRATIONS

Figure Title Page Figure Title Page

1-1 Transmitting Set, Radio AN/GRT-21 and AN/GRT-22...................... 1-0

2-1 Interconnecting Cabling Diagram .................... 2-3 2-2 Typical View Relay Rack Mounting

Bracket (Left Side) ....................................... 2-4 2-3 Mounting Brackets ........................................... 2-5 2-4 Strapping Arrangement .................................... 2-6 2-5 Remote Audio Input and Keying Circuit ......... 2-7 2-6 Exciter, Outline Dimension Drawing............... 2-9 2-7 Power Amplifier, Outline Dimension

Drawing...................................................... 2-10 2-8 Keying Methods W/AFCS A3-Card, AN/GRT-21(V) & AN/GRT-22(V) ........... 2-13

2-9 Keying Methods W/AFCS A3-Card, AN/GRT-21(V) & AN/GRT-22(V) ........... 2-15

2-10 Keying Methods Using Inboard

Monitor/Keyer (IM/K) A3 Card and Audio Amplifier Compressor .............. 2-17

2-11 Keying Methods Using Inboard Monitor/Keyer (IM/K) A3 Card and Line Amplifier ..................................... 2-18

3-1 VHF Exciter and UHF Exciter Controls and Indicators ............................................... 3-5

3-2 VHF Power Amplifier and UHF Power Amplifier Controls and Indicators ............... 3-9

3-3 Exciter RF Carrier Power Vs.

Meter Reading ............................................ 3-17

3-4 Modulation Level Test Setup ......................... 3-17 3-5 Frequency Vs. Digital Units........................... 3-23 3-6 Frequency Vs. Plate Current, UHF ................ 3-26 3-7 RF Pager Output Vs. Meter Reading.............. 3-26 5-1 Exciter Module Location and Identification .... 5-2 5-2 Power Amplifier Module Location and

Identification ................................................ 5-3 5-3 Exciter RF Carrier Power Vs

Meter Reading ............................................ 5-13 5-4 Exciter Reverse (Reflected) RF

Power Vs. Meter Reading .......................... 5-13 5-5 Percent Modulation Vs. Meter Reading ......... 5-13 5-6 Audio Input Line Levels Vs

Meter Reading ............................................ 5-13 5-7 LPA RF Carrier Power Vs. Meter Reading.... 5-14 5-8 LPA Reverse (Reflected) RF Power

Vs. Meter Reading ..................................... 5-14 5-9 Test Set Up for Percent of Modulation .......... 5-36

5-10 Installation Drawing for A8A5U1 (Early Configuration) .............................. 5-36A

5-11 SSVS Printed-Circuit Board Mounting........5-36B 5-12 SSVS Inter-Module, Inter-Chassis Wiring...5-36C 5-13 Proper Orientation of RT2........................... 5-36D 5-14 Intermediate Tube Subassembly

(P/N 8004256G1) ....................................... 5-41 6-1 VHF/UHF Exciter (Unit 1) Block Diagram..... 6-2 6-2 VHF/UHF Power Amplifier (Unit 2)

Block Diagram ............................................. 6-3 6-3 Crystal Controlled Oscillator, (8004290G2) A8, Schematic Diagram......... 6-5 6-4 Crystal Controlled Oscillator

(8004290G3) A8, Schematic Diagram......... 6-7 6-5 Oscillator-Multiplier A8, Schematic Diagram ...................................... 6-8 6-6 Doubler, Radio Frequency (VHF) A9, Schematic Diagram ...................................... 6-9 6-7 Quadrupler (UHF) A9, Schematic Diagram .................................... 6-10 6-8 Quadrupler (UHF) A9, Schematic Diagram .................................... 6-11 6-9 Driver/Power Amplifier (VHF) A10, Schematic Diagram .................................... 6-12 6-10 Driver (VHF) A10A1, Schematic Diagram ... 6-13 6-11 Power Amplifier (VHF) A10A2, Schematic Diagram .................................... 6-14 6-12 Power Amplifier (UHF) A10A2, Schematic Diagram .................................... 6-15 6-13 Driver/Power Amplifier (UHF)

A10, Schematic Diagram ........................... 6-16 6-14 Driver (UHF) A10A1, Schematic Diagram ... 6-17 6-15 Driver (UHF) A10A1, Schematic Diagram ... 6-19 6-16 Power Amplifier (UHF) A10A2, Schematic Diagram .................................... 6-21 6-17 Power Amplifier (UHF) A10A2, Schematic Diagram ................................... 6-22 6-18 Power Amplifier (UHF) A10A2, Schematic Diagram ................................... 6-23 6-19 Power Amplifier (UHF) A10A2, Schematic Diagram .................................... 6-24 6-20 Hybrid A10A6, Schematic Diagram .............. 6-25 6-21 Hybrid/Detector A10A5, Schematic Diagram .................................... 6-26 6-22 Amplifier Compressor Audio A1, Schematic Diagram .................................... 6-27 iv Change 23

LIST OF ILLUSTRATIONS - Continued

Figure Title Page Figure Title Page

6-23 Line Amplifier A1, Schematic 6-41 Converter AC to AC A2, Sche- Diagram ....................................................6-29 matic Diagram..........................................6-59

6-24 Filter Amplifier/Detector A4, 6-42 Buffer Amplifier/Multiplier, Schematic Diagram ..................................6-31 Electrical Instrument A5, 6-25 Buffer Modulator A5, Schematic Schematic Diagram ..................................6-61 Diagram ....................................................6-33 6-43 Exciter, Schematic Diagram....................... 6-63

6-26 Control RF/Modulator A6, Sche- 6-44 Connector/Filter; Cavity Input matic Diagram..........................................6-35 Schematic Diagram ..................................6-65

6-27 Control RF/Modulator A6, Sche- 6-45 Synthesizer A8, Schematic matic Diagram..........................................6-37 Diagram ....................................................6-66

6-28 Control RF/Modulator Feedback 6-46 Divider/Control A8A1, Schemat- Loop, Block Diagram................................6-39 ic Diagram ................................................6-67

6-29 Control, Thermal/Detector Mod- 6-47 RF Generator A8A2, Schematic ulation Percentage/Coaxial Diagram ....................................................6-69 Relay/Control Keyer Inhibit 6-48 Phase Comparator A8A3, Sche- A7, Schematic Diagram ...........................6-40 matic Diagram..........................................6-71

6-30 Keyer, Control Transfer A2, 6-49 Switching Regulator A8A5, Schematic Diagram ..................................6-41 Schematic Diagram ..................................6-73

6-31 Audio Control Circuits, Sche- 6-50 Switching Regulator A8A5, matic Diagram..........................................6-43 Schematic Diagram ..................................6-74

6-32 Keyer KY-668/GRT A3, Sche- 6-51 Inboard Monitor/Keyer Card matic Diagram..........................................6-44 A3, Schematic Diagram ........................ 6-74A

6-33 Power Supply PS1A3, Regulator 6-52 AFCS Keyer Card A3, Sche- PS1A1 and PS1A2, Schematic matic Diagram....................................... 6-74C Diagram ....................................................6-45 6-53 VHF/UHF Driver/Power Am-

6-34 Power Amplifier, Schematic plif ier A10 Wiring Diagram Diagram ....................................................6-47 (8136838G1)........................................... 6-74D

6-35 Tuned Cavity VHF A7, Sche- 6-54 VHF/UHF Driver/Power Am-matic Diagram..........................................6-49 plifier A10A1, Schematic

6-36 Tuned Cavity UHF A7, Sche- Diagram ................................................. 6-74E matic Diagram..........................................6-51 6-54A. VHF/UHF Broadband Driv-

6-37 Power Supply, (Control er/Power Amplifier 1/2 A10 Grid/Thermal Control/AC Schematic Diagram ................................6-74F Control A3, Schematic Diagram..............6-53 6-54B. VHF/UHF Broadband DPA

6-38 AC/Control Circuits, Schematic (Byistor Version) 1/2 A10 Diagram ....................................................6-54 Schematic Diagram ............................... 6-74G

6-39 Power Supply, Plate/Screen Grid 6-55 SSVS Schematic Diagram........................ 6-74H A4, Schematic Diagram ...........................6-55

6-40 Power Supply, Screen Grid A4, Schematic Diagram ..................................6-57

Change 20 v

LIST OF TABLES

Number Title Page Number Title Page

0-1 GRR/GRT Radio Set Configura- 5-8 Fault Diagnosis, Normal Oper-tion Matrix..................................................viii ating Mode ................................................5-17

0-2 VHF Transmitter 5-9 General Fault Indications and T-1108(V)/GRT-21(V) Configuration Recommended Action for Fur- Matrix ............................................................ x ther Fault Diagnosis ................................5-18

0-3 UHF Transmitter 5-10 No Carrier - RGLTD +20 Posi- T-1109(V)/GRT-22(V) Configuration tion on Exciter Reads Zero ......................5-19 Matrix ........................................................... xi 5-11 No Carrier - RGLTD +20 in Ex-

0-4 Radio Frequency Amplifier citer Reads Normal ..................................5-20 (VHF/UHF) Configuration Matrix.............xii 5-12 Low RF Power-Modulation OK

1-1 Leading Particulars....................................... 1-2 or Not (50-Watt Configura- 1-2 Capabilities and Limitations ........................ 1-4 tion) (Transmitter OK per Ta- 1-3 Equipment Supplied...................................... 1-6 ble 5-6, 5-7, and 5-8) ................................5-22 1-4 Equipment Required but not 5-13 High RF Power-Modulation OK

Supplied ......................................................1-7 or Not (50-Watt Configura- 2-1 Unpacking Data............................................. 2-1 tion) (Transmitter OK per Ta- 2-2 Mating Plugs to Exciter and Pow- ble 5-6, 5-7, and 5-8) ................................5-23 er Amplifier Rear Connectors ...................2-2 5-14 Modulation Weak, Distorted or 3-1 VHF/UHF Exciter Controls and None, Carrier Power OK, Indicators ....................................................3-1 10-Watt or 50-Watt Mode 3-2 VHF/UHF Power Amplifier Con- (Transmitter OK per Tables 5-6, 5-7, and trols and Indicators....................................3-7 5-8) ............................................................5-25 5-1 Maintenance Test Equipment 5-15 Power Supply Fault Analysis and Special Tools .......................................5-1 Exciter.......................................................5-26 5-2 Normal Test Position Readings 5-16 Analysis of Automatic Shutdown

Exciter Only................................................5-8 for Over Temperature Condi- 5-3 Normal Test Position Readings, tions in Exciter .........................................5-27

Exciter and Power Amplifier, 5-17 Power Amplifier Fault Analysis ................ 5-29 50 Watt Mode of Operation .......................5-9 5-18 Exciter Tuning Fault Diagnosis

5-4 Typical Test Position Readings, Table and Recommended Ac- Exciter Only, 10 Watt Mode of tion for Further Fault Diagnosis ............5-30 Operation ..................................................5-11 5-19 Power Amplifier Tuning Fault

5-5 Typical Test Position Readings Diagnosis and Recommended with Power Amplifier, Action for Further Fault Diagnosis ........5-31 50-Watt Mode of Operation.....................5-12 5-20 Performance Test of VHF and

5-6 Transmitter Normal Operating UHF Transmitter .....................................5-37 Mode Conditions and Voltages 6-1 Exciter Wire List ......................................... 6-75 10-Watt Mode (Exciter Only) ..................5-15 6-2 Power Amplifier Wire List ......................... 6-82

5-7 Transmitter Normal Operating Mode Conditions and Voltages 50-Watt Mode (Exciter and Power Amplifier) ......................................5-16 vi Change 22

INTRODUCTION

NOTE controls, indicators, and interlocks, and provides starting, operating, stopping, and emergency oper-The term RADIO SET refers to a ation procedures. Chapter 4 discusses the princi-combination of both the Transmitter ples of operation on a functional system basis andand the applicable Radio Frequency also to an operational or signal sequence f low.Amplifier. The actual Radio Set Chapter 5 includes maintenance and alignmentnomenclature, part number and NSN procedures. Chapter 6 contains circuit diagrams.are for reference only and cannot be The alphabetical index following Chapter 6 pro-requisitioned. Not all locations vides references to the appropriate paragraphsrequire both Amplifier and Transmit-according to the subject covered.ter to accomplish their mission. The

Radio Frequency Amplifier is needed Table 1-1 is included here in the introduction only when more than 10 watts is nec- as a cross-reference and indicates which modules essary. Should a ‘‘set’’ be required at are used in each configuration of the transmitter any location that location will have to and which amplifier is used with each transmitter.

requisition both the Radio Frequency

Changes to this manual will be indicated by aAmplifier and Transmitter sepa-vertical line in the margin extending close to therately. When a ‘‘SET’’ is used the entire area of the material affected and at theTransmitter and Amplifier will need binding edge of the page. Change symbols are notto be listed separately on their Table used for:Of Allowance (TA). See Table 1-1 for correct configurations. a. Introductory material, indexes, and tabular data where the change cannot beThis manual contains information to install, identified.operate and maintain transmitter T-1108(V)/GRT-

21(V), or T-1109(V)/GRT-22(V) independent of or b. Blank space resulting from the deletion of in combination with RF Amplifier AM-6154/GRT- text or an illustration or a table.

21 and AM-6155/GRT-22.

c. Correction of minor inaccuracies, such as Both transmitters are identical in physical spelling, punctuation, relocation of mate-size as are either amplifier. Both transmitter and rial, etc., unless such correction changes amplifiers are designed for mounting in a stan- the meaning of instructive information and dard 19-inch rack or cabinet and can be installed procedures.

either independently or in combination.

Reference is made to T.O. 00-25-234, General Radio Transmitter T-1108(V)/GRT-21(V) oper- Shop Practice Requirements for the Repair, Main-ates in the amplitude modulation (AM) mode. It is tenance and Test of Electronic Equipment for capable of transmitting on any one of 680 channels instructions concerning procedures and specific spaced 50 KHz between 116.00 KHz and 149.95 materials to be used in soldering this equipment.

KHz (VHF). By exchanging certain of the fre-

The following publications are listed for refer-quency determining modules with their corre-ence and govern the manner of preparation, use ofsponding UHF modules, the T-1109(V)/GRT-22(V) symbols, terms, reference designations, and abbre-configuration is established which provides trans-viations in this manual.mission capabilities on any one of 3500 channels spaced 50 KHz between 225.00 and 399.95 MHz Military Specifications:(UHF).

Information in this manual is presented in MIL-M-38730 Manuals, Technical:six chapter and one index. Chapter 1 contains a (USAF) General Requirementdescription of the equipment from a functional

For Preparation Ofstandpoint including the capabilities and limita-tions. Information is provided covering leading MIL-T-9941 (USAF) Technical Manuals:

particulars, equipment supplied, and auxiliary Ground C-E Equip-equipment required but not supplied. Chapter 2 ment Facility Site and contains information for installation planning, System, Preparation logistics, installation procedures, and preparation Of for reshipment. Chapter 3 describes all operating

Change 22 vii

Military Standards: Style Manual:

Library of Congress Catalog No. Z253.U58 U.S.

MIL-STD-12 Abbreviations For Use Government Printing Office on Drawings and in Refer to T.O. 31R2-2GRT-512 ‘‘Addition ofTechnical Type Publi- High Voltage Switch on AN/GRT-21/22’’ and T.O.cations 31R2-2GRT-514 ‘‘Intermodulation Distortion Modi- MIL-STD-15-1 Graphical Symbols fication on T-1108/GRT-21.’’

For Electrical and Electronic Diagrams

ASA Y32.16-1965 Electrical and Elec-tronics Reference Des-ignations

Change 22 viiA/(viiB blank)

Table 0-1. GRR/GRT Radio Set Configuration Matrix viii Change 22

Table 0-1. GRR/GRT Radio Set Configuration Matrix (Cont)

Change 22 ix

Table 0-2. VHF Transmitter T-1108(V)/GRT-21(V) Configuration Matrix x Change 22

Table 0-3. UHF Transmitter T-1109(V)/GRT-22(V) Configuration Matrix

Change 22 xi

Table 0-4. Radio Frequency Amplifier (VHF/UHF) Configuration Matrix xii Change 22

Figure 1. Transmitting Set, Radio AN/GRT-21 and AN/GRT-22

NOTE

Transmitter Nomenclature, Part number, NSN are for reference only and cannot be requisitioned.

1-0 Change 22

CHAPTER 1

GENERAL INFORMATION

amplifier. When only 10 watts is required, the exciter only is necessary.

WARNING

1-4. Transmitting Set, Radio AN/GRT-22(V), hereinafter referred to as the UHF transmitting

With the switch off and the fuse cap set, is comprised of Transmitter Radio T-1109(V)/ removed, 115 VAC (hot side) on the GRT-22, hereinafter referred to as the UHF exposed end of fuse holder (F1). When exciter, and Amplifier, Radio Frequency AM-6155/ removing or replacing any fuse, the GRT-22, hereinafter referred to as the UHF power AN/GRT-21/22 should be disconnected amplifier. When only 10 watts is required, the from the 115 VAC source. Failure to exciter only is necessary.

comply with this WARNING could result in serious injury or death. 1-5. An oscillator-synthesizer module is available which is directly interchangeable with and NOTE replaces the crystal oscillator module

The term RADIO SET refers to a 1-6. The VHF exciter, utilizing the oscillator-syn-combination of both the Transmitter thesizer is capable of transmission on any one of and the applicable Radio Frequency 2720 channels spaced 12.5 khz between 116.00 Amplifier. The actual Radio Set mhz and 149.9875 mhz.

nomenclature, part number and NSN are for reference only and cannot be 1-7. The UHF exciter, utilizing the oscillator-syn-requisitioned. Not all locations thesizer is capable of transmission on any one of require both Amplifier and Transmit- 7000 channels spaced 25 khz between 225.00 and ter to accomplish their mission. The 399.975 mhz.

Radio Frequency Amplifier is needed

1-8. Frequency selection utilizing the oscillatoronly when more than 10 watts is nec-synthesizer module is obtained by direct dialingessary. Should a ‘‘set’’ be required at the required input frequency to the doubler orany location that location will have to quadrupler module.request both the Radio Frequency

Amplifier and Transmitter sepa- 1-9. An oscillator-multiplier module is available rately. When a ‘‘SET’’ is used the which is directly interchangeable with the crystal- Transmitter and Amplifier will need oscillator module or the oscillator-synthesizer mod-to be listed separately on the Table Of ule. This oscillator-multiplier module differs from Allowance (TA). See Table 1-1 for the crystal oscillator series in that it utilizes a fun-correct configurations. damental crystal rather than a fifth overtone type and the crystal oven is eliminated. Frequency 1-1. INTRODUCTION. This chapter contains accuracy is determined by ‘‘pulling’’ the crystal.

information concerning Transmitting Set, Radio Tuning is accomplished to the exact frequency by AN/GRT-21 (V) and Transmitting Set, Radio AN/ monitoring the frequency with a counter.

GRT-22(V). A description of the equipment, its

1-10. Common to both the VHF exciter and thepurpose and strategic mission, capabilities and UHF exciter is Keyer, KY-668/GRT, hereinafterlimitations, leading particulars, and operation are referred to as the special purpose keyer.discussed in the following paragraphs.

1-11. The VHF transmitting set and the UHF

1-2. DESCRIPTION AND PURPOSE. transmitting set are designed for worldwide deployment in the air-traffic control service and

1-3. Transmitting Set, Radio AN/GRT-21(V), provide ground-to-air and point-to-point voice com-hereinafter referred to as the VHF transmitting munication. See figure 1-1.

set, is comprised of Transmitter, Radio T-1108(V)/ GRT-21, hereinafter referred to as the VHF 1-12. The VHF transmitting set and the UHF exciter,and Amplifier, Radio Frequency AM-6154/ transmitting set are designed to perform reliably GRT-21, hereinafter referred to as the VHF power in an air-traffic control environment.

Change 22 1-1

1-13. The VHF exciter is a crystal-controlled self- 1-18. The special purpose keyer provides addi-contained solid-state assembly that operates in the tional keying capability when the standard keying amplitude modulation (AM) mode. It is capable of circuit is not adequate for the special environment transmission on any one of 680 channels spaced 50 confronted by the exciters.

khz between 116.00 mhz and 149.95 mhz as deter-

1-19. The VHF exciter and the UHF exciter andmined by the operating frequency of the crystal power amplifiers each have their own integralused. Transmitter has capability of Secure Voice power supplies.Operation.

1-14. The UHF exciter is a crystal-controlled 1-20. LEADING PARTICULARS.

self-contained solid-state assembly that operates in

1-21. The physical and electrical characteristicsthe amplitude modulation (AM) mode. It is capa-of the VHF exciter and the UHF exciter and powerble of transmission on any one of 3500 channels amplifiers are listed in table 1-1.spaced 50 khz between 225.00 mhz and 399.95 mhz as determined by the operating frequency of 1-22. CAPABILITIES AND LIMITATIONS.the crystal used. The UHF exciter configuration is normally obtained by substituting UHF modules 1-23. The capabilities and limitations of the VHFfor the comparable VHF frequency determining exciter, the UHF exciter, the VHF power ampli-and controlling modules. fier, and the UHF power amplifier are listed in table 1-2.1-15. The VHF exciter and the UHF exciter have provisions for use of an external precision oscilla- 1-24. EQUIPMENT SUPPLIED.tor in lieu of a crystal for frequency control.

1-25. Equipment supplied comprising the VHF1-16. The VHF exciter and the UHF exciter are transmitting set and the UHF transmitting set iscapable of providing a minimum carrier power of listed in table 1-3.10 watts with 90 percent modulation capability.

1-17. When driven by their corresponding excit- 1-26. EQUIPMENT REQUIRED BUT NOT SUPPLIED.

ers the VHF power amplifier and the UHF power amplifier are capable of providing a minimum car- 1-27. Test equipment or equivalent required for rier power of 50 watts with 90 percent modulation maintenance but not supplied with the VHF and capability. UHF transmitting set is listed in table 1-4.

Table 1-1. Leading Particulars

CHARACTERISTIC REQUIREMENT

PRIMARY INPUT POWER 105, 120, 210 and 240 volts ± 10%, single phase 47 hz to 420 hz, 140 watts maximum. If ac power fails, a 24 volt lead acid battery is automatically switched in to

VHF/UHF Exciter provide emergency power for a period dependent on the battery amp-hr (AH) capacity. A 100 AH battery will pro-vide power for approximately 15 hours to a transmitter con-tinuously keyed. When 210, 240 ac power operation is required and wire on PS1TB1, terminal 7 is a gray wire (this note does not apply when black with white tracer wire is on terminal 7) make certain that wire gauge size is No. 22 and that gray wire on terminal 5 of PS1TB1 is No. 20 gauge. In some equipments these wires have been inadvertently re-versed.

VHF/UFH Power Amplifier 105, 120, 210, and 240 volts ± 10%, single phase 47 hz to 420 hz 610 watts maximum. Automatic switching of anten-na from power amplifier to exciter upon loss of ac power or failure of the power amplifier.

1-2 Change 22

Table 1-1. Leading Particulars (Cont)

CHARACTERISTIC REQUIREMENT

PHYSICAL DESCRIPTION

VHF/UHF Exciter

Dimensions 5-1/4 inches high; 17-3/4 inches wide; 16-7/8 inches deep (Standard 19-inch rack or cabinet mounting).

Weight 43 pounds

VHD/UHF Power Amplifier

Dimensions 7 inches high; 17-3/4 inches wide; 18-1/2 inches deep (Stan-dard 19-inch rack or cabinet mounting).

Weight 70 pounds

CABLE REQUIREMENTS Provided by Air Traffic Control Central

Change 22 1-2A/(1-2B blank)

Table 1-2. capabilities and Limitations (Cont.)

CHARACTERISTICS REQUIREMENT

Audio Distortion At rated carrier output 90\ modulated and at all fre quencies between 300 hz and 6000 hz total harmonic distortion in demodulated output condition less than 10\ at 0 db compression and limiting. Under same con ditions with maximum compression and limiting total harmonic distortion less than 15\. When the line amplifier module is used in the exciter no compression exists. When R10 is properly adjusted distortion will be less than 10\.

Keying

Thermal Protection

Status Monitor

VHF/UHF POWER AMPLIFIER

Antenna Transfer Circuit

Thermal Protection

Semiconductor switching devices. External and local keying provisions.

Local:

a. CArbon microphone

b. Dynamic microphone

c. carrier test

Remote:

a. Simplex ground

b. XY-668/GRT, (Navy Only) Special Purpose Keyer:

Provides external keying in push-to-talk mode by 20 to 60 ma into 150 ohms and 50 volts or 100 volts into 47 K ohms or 300 hz to 3000 hz tone.

c. Inboard Monitor/Keyer (optional): Provides external non-polarized voltage keying up to 48 Vdc.

Solid-state protective circuitry actuated at 8S·C.

Typically. no air flow exists into the cavity. or the detected fan voltage is low due to fan failure.

With the Inboard Monitor/Keyer A3 installed (optional), Signal outputs are provided for external monitoring of forward power, reverse power, audio input, and output percentage of modulation. Impedance of each output is 300 ohms.

Automatic semiconductor control of coaxial relay switching of antenna from power amplifier to exciter upon loss of primary ac power or power amplifier failure, or vswr of greater than 3 to 1.

SOlid-state protective circuitry. activated when exit air from rear port exceeds 147·C typically.

Change 1.0 1- 5

I

T.O.31JU.1GRT.10l NA VELEX 0967.;LP4l9·5010

Table 1-3. Equipment SUpplied

OFFICIAL

NOMENCLATURE

Transmitter, Radio T-1108(V)/GRr-21

Keyer KY-668/GRr (Navy only)

Amplifier, Radio Frequency AM-6154/GRr-21 i •. ~

Transmitter, Radio T-1109(V)/GRr-22

Kayer KY-668/GRr (Navy only)

Slide, Drawer Extension

COMMON NAME

VHF Exciter

Special Purpose Keyer

VHF Power Amplifier

UHF Exciter

Special Purpose Keyer

ITT PIN 512308-1 & 512308-2

NOTE

Slide Drawer Extensions and Interface cable "Kit must be .Shipped with the radio set.

1-6 CHANGE 1

T.O.31R2-2GRT·l02

NA VELEX 0967·LP-429-5010

Table )·3. Equipment Supplied (Cont.)

OFFICIAL

NOMENCLATURE

Amplifier, Rad~o Frequency AM.61SS/GRT.22

Interface Cables, 8006149G 1 (For 50 Watt Configuration~ Required for AN/GRT-21(V) or AN/GRT-22(V) Transmitting Sets.' Consists of:

Cable, Special Purpose, ITT 8006147G2 (WO

Cable, Special Purpose, ITT 8006147G3 (W2)

Cable, Special Purpose, ITT 800614SGl (W3)

Cable, Special Purpose, ITT 800614SG2 (W4)

Cable, Special Purpose, ITT 80061S0Gl (WS)

Connector, Plug, HS3108A-24-28s

Clamp, Cable, MS30S7-16A

Interface Cables, B006149G2 (For 10Watt Configuration).

Required for T-ll08(V)GRT-21 or T-l109(V)GRT-22 Exciters only. (Required when requisitioned or returned as separate unit). COr:'lsists of:

Cable, Special Purpose, ITT 8006147G2 (Wl)

Connector, Plug HS3108A-24-28S·

.. Clamp, Cable, MS30S7-16A

Interfacr Cables, 8006149G3. Required for AM- 6154/GRT-21 or AM-6155/GRT-22, Linear Power Amplifiers only. (Required when requisitioned or returned as separate unit). Consists of:

Cable, Special Purpose, 8006147G3(W2)

Cable, Special Purpose, 8006145Gl(W3)

Cable, Special Purpose, 8006145G2(W4)

Cable, Special Purpose, 8006150G1(W5)

COMMON NAME

VHF Power Amplifier

Exciter AC Input Cable

Power Amplifier AC Input Cable

Coaxial Interconnect Cable

Coaxial Interconnect Cable

Interconnecting Cable

Connector

Clamp

Exciter AC ~nput Cable

Connector

. C~.amp

Power Amplifier AC Input Cable

Coaxial Interconnect Cable

Coaxial Interconnect Cable

Interconnecting Cable

CHANGE 1 1-6A/(1-6B blank)

T.O.31JU..2GRT.I01

NA VELEX 0967.LP419·S010

Table 1-4. Equipment Required (Or Equivalent) But Not Supplied

DESCRJPTION

Plug-In Unit, Electronic:

Dummy Load, Electronic

Counter, Frequency Measuring

Plug-In Unit, Electronic

Test Set, RF Power

OsciUoecope

Plug·ln Unit, Electronic:.

Plug In Unit, Electronic·

Meter, Vector Impedance.

Distortion Analyzer*

Voltmeter, Electronic.

Multimeter, Digital

Crystal Unit,.Quartz

Power Supply, 19.5 V@ lOa*

Directional Coupler"

Power Meter*

Tbennistor Mount*

Attenuator 10 dB, 5"W*

Attenuator 3 dB, 20 w*

Attenuator 20 dB, 100 W*

Attenuator 20 dB, 5 w*

Power Supply, 0-18 v*

Ammeter, 0-15 Amps*

Card Extender

MODEL OR TYPE

DESIGNATOR

Tektronix IA 1

Bird 8135

Hewlett Packard 5245L

Hewlett Packard 5253B

Bird 43

TektrOnix, RM547

Tektronix,IL20

Tektronix, lSI

Hewlett Packard 481 SA

Hewlett Packard 334A

Fluke SOl

Fluke 8300A

CR-143/U (Holder Type HC27/U)

New Jersey Electronics QR 36-10

. Hewlett PICkard 7780

Hewlett Packard 430C

Hewlett Packard 4778

Microlab/FXR AE-IO-N

Narda 766-3

Electro-Impulse AX20-100

Narda 765-20

Power Design 36505

Weston Model 931 rrT PIN 8004809

. FEDERAL STOCK

NUMBER

6615·929·1 89SY A

6615·121-1 694YA

6615·933-2719YA

6615-061-0225

6625-871-8012

6615·753-2114

6615-00-432-5221

S985-~9-3215

6615-560-6084

CHANGE I 1·7

T.O. 311U-2GRT.IIJ2

NA VELEX 0967·LP-419-S010

CHAPI'ER 2

INSTALLATION

2·1. INTRODUCTION. Infonnation and instnictions necessuy to unpack. install. make o~ble and prepare the VHF exciter, UHF exciter. VHF power amplifier and UHF power. ampUf.er for IeSbipment are included in this

. chapter. Section I provides installation planning information. Section II covers receipt aaw.'w.PacJwii' of the equipment. Section IU provides installation procedures. and Section IV contains preparation for reshipment data .

SECI10N I

INSTALLATION PLANNING

2·2. GENERAL.

2·3. .. The VHF exciter. UHF exciter. VHF power amplifier and UHF power amplifier are insta1led in standard relay racks in the Air Traffic: Control Central.

No installation planning is required as ~erac:ks .. ;bave .

provision to accept the chassis. Note: Slide, Drawer Ex· tensions. and Interface cable kit must be shipped with .

the radio set.

SECI'ION II

LOGISTICS

2-4. RECEIVING DATA.

2·5. The VHF exciter and the VIIF power amplifier are each packed in a separate expanded pqIystyiene foam container. Each container is sealed in a snug fitting barrier pouch. The two units are packed in a single style A cleated plywood box constructed of 3/8 inch plywood sheathing. The UHF exciter and the UHF power ampUfaer are packed identically to the VHF exciter and VHF power amplifier. Table 2-1 shows the packed and unpacked dimensions and weights of the units.

Table 2-1. Unpacking Data

UNPACKED

QUANTITY DESCRIPTION DIMENSIONS

1 VHF Exciter 5·1/4 in. high;

19 in. wide;

16.7/8 in. deep t VHF Power 7 in. high;

AmpUfIer 19 in. wide;

18-1/2 in. deep

1 UHF Exciter 5·1/4 in. high;

19 in. wide;

16.7/8 in. deep

I UHF Power 7 in. high;

Amplif'ler 19 in. wide;

18-1/2 in. deep .

.PACKEIJ

DIMENSIONS

21 in. high;

25 in. wide;

26 in. deep.

21 in. high;

25 in. wide;

26 in. deep.

UNPACKED

··WEIGKI'

43…