31R4-2FRN-41 CHANGE 6.pdf

TO 31R4-2FRN-41

1 SEPTEMBER 2003 Change 6 6 MARCH 2012

TECHNICAL MANUAL

OPERATION, INSTALLATION,

AND

MAINTENANCE INSTRUCTIONS

TACAN ANTENNA GROUP

AT-100

(OE-537/FRN)

(CONFIGURATION 6)

RANTEC MICROWAVE & ELECTRONICS, INC.

FO4606-95-C-0023

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 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 D - Distribution authorized to Department of Defense and U.S. DoD contractors only. Due to critical technology (6 February 2012). Other requests for this document shall be referred to OC-ALC/GKAAB, Tinker AFB, Oklahoma 73145-9155.

WARNING - This document contains technical data whose export is restricted by the Arms Export Control Act (Title 22, U.S.C. 2751 et seq.) or Executive Order 12470. 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 - Handle in compliance with distribution statement and destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

PUBLISHED UNDER THE AUTHORITY OF THE SECRETARY OF THE AIR FORCE

A Change 6 USAF

LIST OF EFFECTIVE PAGES

INSERT LAST CHANGED PAGES. DESTROY SUPERSEDED PAGES.

NOTE: The portion of the text affected by the changes is indicated by a vertical line in the outer margins of the page. Changes to illustrations are indicated by miniature pointing hands. Changes to wiring diagrams are indicated by shaded areas.

Dates of issue for original and changed pages are:

Original ................. 0 ................ 01 Sept 2003 Change ................... 4 ............... 03 June 2009 Change ................. 1 ................ 15 Nov 2007 Change ................... 5 ............... 06 Feb 2012 Change .................. 2 ................ 15 Mar 2008 Change ................... 6 ............... 06 Mar 2012 Change .................. 3 ................ 14 May 2009

TOTAL NUMBER OF PAGES IN THIS PUBLICATION IS 250, CONSISTING OF THE FOLLOWING:

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TABLE OF CONTENTS

Chapter/Para Page

LIST OF ILLUSTRATIONS ................................................................................................................ viii

LIST OF TABLES .............................................................................................................................. iv

1 GENERAL INFORMATION AND SAFETY PRECAUTIONS .......................................................... 1-1

1.1 Safety Precautions .......................................................................................................... 1-1

1.2 Introduction ..................................................................................................................... 1-2

1.3 General Description ........................................................................................................ 1-2

1.4 Description of Principal Units .......................................................................................... 1-2

1.4.1 OE-537/FRN TACAN Antenna ........................................................................................ 1-2

1.4.2 MG-100B Modulation Generator ..................................................................................... 1-3

1.5 Reference Data ............................................................................................................... 1-3

1.6 Equipment Required, But Not Supplied .......................................................................... 1-3

2 OPERATION ................................................................................................................................... 2-1

2.1 Introduction ..................................................................................................................... 2-1

2.2 Controls and Indicators ................................................................................................... 2-1

2.2.1 Modulation Generator ..................................................................................................... 2-1

2.2.2 Antenna ........................................................................................................................... 2-1

2.3 Operating Procedures ..................................................................................................... 2-1

2.3.1 Order of Turn-On ............................................................................................................. 2-1

2.3.2 Operator Turn-On ............................................................................................................ 2-10

2.3.3 Modes of Operation......................................................................................................... 2-11

2.3.4 Emergency Operation ..................................................................................................... 2-11

2.3.5 Operation With Status Indicators Out ............................................................................. 2-12

2.3.6 DME Only Operation ....................................................................................................... 2-12

2.3.7 Operator Turn-On ............................................................................................................ 2-12

2.3.8 Emergency Turn-On........................................................................................................ 2-12

2.3.9 TACAN Error Assessment for Azimuth Accuracy and Antenna Modulation Fault .......... 2-13

3 FUNCTIONAL DESCRIPTION ........................................................................................................ 3-1

SECTION I Overall Description ................................................................................................... 3-1

3.1 Introduction ..................................................................................................................... 3-1

3.2 TACAN Fundamentals .................................................................................................... 3-1

3.2.1 System Signal Components ............................................................................................ 3-1

3.2.2 Distance Information ....................................................................................................... 3-1

3.2.3 Bearing Information ......................................................................................................... 3-1

3.3 OE-537/FRN Functional Description ............................................................................... 3-2

3.3.1 Overall Functional Description ........................................................................................ 3-2

3.3.2 RF Signals ....................................................................................................................... 3-2

3.3.3 Modulation Drive Signals ................................................................................................ 3-2

3.3.4 Interface Connections ..................................................................................................... 3-2 ii

TABLE OF CONTENTS - Continued

Chapter/Para Page

SECTION II Major Functional Description .................................................................................... 3-7

3.4 Antenna 1A1 Functional Description ............................................................................... 3-7

3.4.1 Component Description................................................................................................... 3-7

3.4.2 Signal Paths .................................................................................................................... 3-7

3.4.3 Antenna Pattern Rotation ................................................................................................ 3-7

3.4.4 Monitor Circuits ............................................................................................................... 3-9

3.5 Modulation Generator 1A2 Functional Description ......................................................... 3-9

3.5.1 Overall Description .......................................................................................................... 3-9

3.5.2 System Clock and Dividers (1) ........................................................................................ 3-9

3.5.3 Reset and Deadman Logic (2) ........................................................................................ 3-9

3.5.4 Trigger Generator (3) ...................................................................................................... 3-9

3.5.5 Digital Drive Generator (4) .............................................................................................. 3-10

3.5.6 36 Output Multiplexed D/A Converter (5) ........................................................................ 3-10

3.5.7 36 Column Drivers (6) ..................................................................................................... 3-10

3.5.8 36 Input BITE MUX (7) .................................................................................................... 3-10

3.5.9 Digital BITE Generator (8)............................................................................................... 3-10

3.5.10 BITE D/A Converter (9) ................................................................................................... 3-10

3.5.11 Generator Null Circuits (10) ............................................................................................ 3-10

3.5.12 Analog References and Signal Conditioners (11) ........................................................... 3-10

3.5.13 A/D Converter (12) .......................................................................................................... 3-10

3.5.14 Operator Interface (13).................................................................................................... 3-10

3.5.15 NORTH and BITE Thumbwheel Switches (14) ............................................................... 3-10

3.5.16 Mode Select Switch (15) ................................................................................................. 3-11

3.5.17 Microprocessor (16) ........................................................................................................ 3-11

3.5.18 36 Pin Diode Modulator (17) ........................................................................................... 3-11

3.5.19 36 Monitor Diodes (18).................................................................................................... 3-11

3.5.20 Antenna Multiplexer (19) ................................................................................................. 3-11

SECTION III Software Flow Description ........................................................................................ 3-12

3.6 Introduction ..................................................................................................................... 3-12

3.7 Software Initialization ...................................................................................................... 3-12

3.8 Software Full Loop (Entry B) ........................................................................................... 3-12

3.9 Software Main Loop ........................................................................................................ 3-13

3.9.1 Software DME Mode ....................................................................................................... 3-13

3.9.2 Software TEST Mode ...................................................................................................... 3-13

3.9.3 Software Normal Mode ................................................................................................... 3-13

3.10 Software Shutdown Routine ........................................................................................... 3-13

SECTION IV Circuit Level Description ........................................................................................... 3-15

3.11 Antenna Circuit Descriptions ........................................................................................... 3-15

3.11.1 Introduction ..................................................................................................................... 3-15

3.11.2 3-Water Power Divider 1A1A40 ...................................................................................... 3-15

3.11.3 Azimuth Feeds 1A1A37, 1A1A38, 1A1A39..................................................................... 3-15

3.11.4 Vertical Columns 1A1A1 through 1A1A36 ...................................................................... 3-15

3.11.5 Antenna Monitor PC Card 1A1A40A1 ............................................................................. 3-15 iii

TABLE OF CONTENTS- Continued

Chapter/Para Page

3.12 Modulation Generator Clocks and Trigger generator Circuitry ....................................... 3-16

3.12.1 Introduction ..................................................................................................................... 3-16

3.12.2 Clock Circuits .................................................................................................................. 3-16

3.12.3 Trigger Generator ............................................................................................................ 3-16

3.13 Modulation Generator Microprocessor Circuitry ............................................................. 3-16

3.13.1 Introduction ..................................................................................................................... 3-16

3.13.2 Microprocessor & PROM ................................................................................................ 3-16

3.13.3 Address Latch ................................................................................................................. 3-17

3.13.4 External Address and Onboard Jumper Buffers ............................................................. 3-17

3.13.5 Reset Logic ..................................................................................................................... 3-17

3.13.6 Deadman Timers ............................................................................................................. 3-17

3.13.7 Deadman Counter and Latch .......................................................................................... 3-17

3.13.8 Two-Minute Remove ....................................................................................................... 3-17

3.13.9 Shutdown Logic ............................................................................................................... 3-17

3.13.10 Chip Select Logic ............................................................................................................ 3-17

3.13.11 RAM ................................................................................................................................ 3-18

3.13.12 Offboard Data Bus Buffer ................................................................................................ 3-18

3.13.13 Input Ports ....................................................................................................................... 3-18

3.13.14 Output Ports .................................................................................................................... 3-19

3.13.15 Bus Pullups ..................................................................................................................... 3-19

3.14 Modulation Generator Digital Driver Circuitry ................................................................. 3-19

3.14.1 Introduction ..................................................................................................................... 3-19

3.14.2 Divide-By-12 and Drive Counter Logic............................................................................ 3-19

3.14.3 Divide-By-32,400 Column Drive Counter ........................................................................ 3-19

3.14.4 Drive MUX Enable Decoder ............................................................................................ 3-19

3.14.5 Column Drive PROM and Drive Compression PROM .................................................... 3-19

3.14.6 D/A Converter and 36 Output MUX ................................................................................ 3-20

3.14.7 36 Column Drivers .......................................................................................................... 3-20

3.15 Modulation Generator Digital BITE Circuitry ................................................................... 3-20

3.15.1 Introduction ..................................................................................................................... 3-20

3.15.2 Programmed BITE Counter and BITE Count Adder ....................................................... 3-20

3.15.3 BITE PROM and BITE Compression PROM .................................................................. 3-20

3.15.4 BITE D/A Converter ........................................................................................................ 3-20

3.15.5 36 Input BITE MUX and GEN-MON Signal Buffer .......................................................... 3-20

3.15.6 Differential Amplifier, GNUL Comparator and GNUL Logic ............................................ 3-21

3.16 Modulation Generator Analog circuits ............................................................................. 3-21

3.16.1 Introduction ..................................................................................................................... 3-21

3.16.2 Master Reference ............................................................................................................ 3-21

3.16.3 3.68 V Trigger Bias Circuits ............................................................................................ 3-21

3.16.4 PIN Diode Bias Generator and Inverting Amplifier ......................................................... 3-21

3.16.5 Temperature Buffer (5) ................................................................................................... 3-21

3.16.6 Monitor Diode Buffer ....................................................................................................... 3-21

3.16.7 Selectable Gain Amplifier ................................................................................................ 3-21

3.16.8 Antenna Signal Peak Rider and Calibration Buffer ......................................................... 3-21

3.16.9 DC Power Scaling & Buffering ........................................................................................ 3-22

3.16.10 Analog MUX, A/D Converter and Reference .................................................................. 3-22

3.17 Operator Interface and Front Panel Circuits ................................................................... 3-22 iv

Chapter/Para Page

3.17.1 Introduction ..................................................................................................................... 3-22

3.17.2 Chip Select Logic and Thumbwheel Switches ................................................................ 3-22

3.17.3 Extended Output Ports and LED Drivers ........................................................................ 3-22

3.17.4 Shutdown Alarm Logic and Relay Drivers ...................................................................... 3-22

3.17.5 Extended Input Port ........................................................................................................ 3-23

3.18 Modulation Generator Power and Control Circuitry ........................................................ 3-23

3.18.1 Introduction ..................................................................................................................... 3-23

3.18.2 Input Power Circuits ........................................................................................................ 3-23

3.18.3 Power Supply .................................................................................................................. 3-23

3.19 Beacon Interface ............................................................................................................. 3-23

3.19.1 Introduction ..................................................................................................................... 3-23

3.19.2 North Trigger ................................................................................................................... 3-23

3.19.3 Auxiliary Trigger .............................................................................................................. 3-23

3.19.4 Identity Tone ................................................................................................................... 3-23

3.19.5 Beacon Shutdown ........................................................................................................... 3-23

3.19.6 Soft Failure ...................................................................................................................... 3-23

3.19.7 Frequency Status ............................................................................................................ 3-24

3.19.8 Power Status ................................................................................................................... 3-24

3.19.9 DME Command ............................................................................................................... 3-24

3.19.10 MODE Indication ............................................................................................................. 3-24

3.19.11 Beacon Reset .................................................................................................................. 3-24

3.19.12 Air Force Soft Fail ........................................................................................................... 3-24

3.19.13 RS 232 Signals ............................................................................................................... 3-24

4 SCHEDULED MAINTENANCE ....................................................................................................... 4-1

4.1 Scheduled Maintenance.................................................................................................. 4-1

4.2 Test Procedures .............................................................................................................. 4-2

4.2.1 Required Equipment ....................................................................................................... 4-2

4.2.2 Special Procedures and Adjustments ............................................................................. 4-2

4.2.3 Quarterly Tests - Modulation Generator ......................................................................... 4-2

4.2.4 Semiannual Tests - Antenna ........................................................................................... 4-10

5 TROUBLESHOOTING .................................................................................................................... 5-1

SECTION I Normal Operation and Fault Indicators .................................................................... 5-1

5.1 Normal Operation ............................................................................................................ 5-1

5.1.1 Control Settings ............................................................................................................... 5-1

5.1.2 Indicator Lamps/Column Display .................................................................................... 5-1

5.1.3 Test Jack ......................................................................................................................... 5-1

5.2 Fault Indication ................................................................................................................ 5-2

5.2.1 General............................................................................................................................ 5-2

5.2.2 Status Lamps .................................................................................................................. 5-2

5.2.3 Fault Lamps .................................................................................................................... 5-2

5.3 BITE Operation ............................................................................................................... 5-2

5.4 Test Mode Operation ...................................................................................................... 5-2 v

Chapter/Para Page

SECTION II Troubleshooting Procedures .................................................................................... 5-3

5.5 Introduction ..................................................................................................................... 5-3

5.5.1 Failure Indication ............................................................................................................. 5-3

5.5.2 References ...................................................................................................................... 5-3

5.6 Power-Related Failures .................................................................................................. 5-3

5.7 Fault Logic Diagram ........................................................................................................ 5-4

5.8 Return to Service ............................................................................................................ 5-5

5.9 Schematic and Parts Layout ........................................................................................... 5-5

6 CORRECTIVE MAINTENANCE...................................................................................................... 6-1

SECTION I Adjustment and Alignment........................................................................................ 6-1

6.1 Introduction ..................................................................................................................... 6-1

6.2 Power Supply 1A2A7 Voltage Adjustments .................................................................... 6-1

6.3 Reference Voltage Adjustments ..................................................................................... 6-1

6.3.1 5.75 VREF Adjust ............................................................................................................ 6-1

6.3.2 1.265 VREF Adjust.......................................................................................................... 6-1

6.4 Trigger Adjustments ........................................................................................................ 6-1

6.4.1 North Trigger Adjust ........................................................................................................ 6-1

6.4.2 Auxiliary Trigger Adjust ................................................................................................... 6-1

6.4.3 Tone Signal Adjust .......................................................................................................... 6-1

6.5 Radiated Power Test Level Adjustment .......................................................................... 6-1

6.6 North Alignment .............................................................................................................. 6-1

6.6.1 Compass Method ............................................................................................................ 6-1

6.6.2 Flight Check Method ....................................................................................................... 6-2

SECTION II Repair ....................................................................................................................... 6-3

6.7 Introduction ..................................................................................................................... 6-3

6.8 Antenna 1A1 ................................................................................................................... 6-4

6.8.1 Removal and Replacement of Vertical Aperture Column 1A1A1 through A36............... 6-4

6.8.2 Removal and Replacement of Monitor Diode Detector 1A1A1CR1 through

1A1A36CR1 .................................................................................................................... 6-5

6.8.3 Removal and Replacement of Azimuth Feed 1A1A37, 1A1A38, and 1A1A39 .............. 6-5

6.8.4 Removal and Replacement of Azimuth Feed PIN Diode/Resistor Set 1A1A37CR1 through CR12, 1A1A38C1 through CR12, and 1A1A39CR1 through CR12 .................. 6-6

6.8.5 Removal and Replacement of 3-Way Power Divider 1A1A40 ........................................ 6-6

6.8.6 Removal and Replacement of Antenna Monitor Printed Circuit Card 1A1A40A1 .......... 6-7

6.8.7 Removal and Replacement of Humidity Indicator 1A1DS1 ............................................ 6-7

6.8.8 Removal and Replacement of Breather Valve 1A1MP4 ................................................. 6-7

6.8.9 Removal and Replacement of Desiccant 1A1MP5 ......................................................... 6-8

6.8.10 Removal and Replacement of Desiccant Holder 1A1MP5 ............................................. 6-8

6.8.11 Removal and Replacement of Access Door Gasket 1A1MP7 ........................................ 6-8

6.8.12 Removal and Replacement of RF Cable 1A1W1 through W39 ...................................... 6-9 vi

Chapter/Para Page

6.8.13 Removal and Replacement of RF Cable 1A1W40 ........................................................ 6-9

6.8.14 Removal and Replacement of Monitor Logic Cable Harness 1A1W1 ............................ 6-9

6.8.15 Removal and Replacement of Modulation Cable Harness 1A1W42 .............................. 6-10

6.8.16 Removal and Replacement of Monitor Diode Cable Harness 1A1W43 ......................... 6-10

6.9 Modulation Generator 1A2 .............................................................................................. 6-10

6.9.1 Removal and Replacement of Unit from Equipment Rack or Cabinet ............................ 6-11

6.9.2 Removal and Replacement of Printed Circuit Cards 1A2A3 through 1A2A6 ................. 6-11

6.9.3 Removal and Replacement of Front Panel PCC 1A2A2A2 ............................................ 6-11

6.9.4 Removal and Replacement of Power Supply 1A2A7 ..................................................... 6-12

6.9.5 Removal and Replacement of Front Panel Power On Lamp .......................................... 6-12

6.9.6 Removal and Replacement of Fuse 1A1A2F1 or F2 ...................................................... 6-12

6.9.7 Removal and Replacement of Front Panel Power Switches .......................................... 6-12

6.9.8 Removal and Replacement of Front Panel Emergency Operation Switch ..................... 6-12

6.9.9 Removal and Replacement of Front Panel Audible Alarm ............................................. 6-13

6.10 Field Repairing and Repainting of the OE-537/FRN TACAN Antenna ........................... 6-13

6.10.1 Materials Required .......................................................................................................... 6-13

6.10.2 Equipment Required ....................................................................................................... 6-13

6.10.3 Procedures ...................................................................................................................... 6-13

7 REPLACEABLE PARTS ................................................................................................................. 7-1

7.1 Introduction ..................................................................................................................... 7-1

7.2 Replaceable Parts List .................................................................................................... 7-1

8 INSTALLATION ............................................................................................................................... 8-1

SECTION I Site Information ........................................................................................................ 8-1

8.1 Introduction ..................................................................................................................... 8-1

8.2 Installation Planning ........................................................................................................ 8-1

8.3 Installation Material ......................................................................................................... 8-1

8.4 Antenna Siting ................................................................................................................. 8-5

8.4.1 Ideal Site Location ........................................................................................................... 8-5

8.4.2 Typical Vertical Pattern ................................................................................................... 8-5

8.4.3 Radiation Below the Horizon ........................................................................................... 8-5

8.4.4 Reflecting Surface ........................................................................................................... 8-5

8.4.5 Site selection ................................................................................................................... 8-10

8.4.6 Range .............................................................................................................................. 8-10

8.4.7 Fresnel Zone ................................................................................................................... 8-10

8.4.8 Obstacles ........................................................................................................................ 8-10

8.4.9 Multiple reflection ............................................................................................................ 8-14

8.4.10 Side Reflections .............................................................................................................. 8-14

8.4.11 Antenna Height Relation to Surface Roughness ............................................................ 8-14

8.4.12 Roughness Coverage ..................................................................................................... 8-14 vii

Chapter/Para Page

SECTION II Installation Procedures ............................................................................................. 8-16

8.5 Antenna Installation......................................................................................................... 8-16

8.5.1 Installation Materials and Tools ...................................................................................... 8-16

8.5.2 Mounting Considerations ................................................................................................ 8-16

8.5.3 Antenna Mounting ........................................................................................................... 8-16

8.5.4 Lightning Rod Installation ................................................................................................ 8-17

8.5.5 Cable Connections .......................................................................................................... 8-17

8.5.6 Antenna Access Door Closing Procedure....................................................................... 8-18

8.6 Modulation Generator Installation ................................................................................... 8-18

8.6.1 Mounting ......................................................................................................................... 8-18

8.6.2 Cabling ............................................................................................................................ 8-18

8.7 System Interfacing Connections and Configuration Jumpers ......................................... 8-18

8.7.1 Interfacing Considerations .............................................................................................. 8-18

8.7.2 North Trigger ................................................................................................................... 8-19

8.7.3 Auxiliary Trigger .............................................................................................................. 8-19

8.7.4 Trigger Pulse Length ....................................................................................................... 8-19

8.7.5 Tone ................................................................................................................................ 8-19

8.7.6 Beacon Shutdown ........................................................................................................... 8-19

8.7.7 Soft Failure ...................................................................................................................... 8-19

8.7.8 Frequency ....................................................................................................................... 8-23

8.7.9 Power Status ................................................................................................................... 8-24

8.7.10 DME Mode Indication ...................................................................................................... 8-25

8.7.11 Remote Command of DME Mode ................................................................................... 8-25

8.7.12 Beacon Reset .................................................................................................................. 8-25

8.7.13 Ground ............................................................................................................................ 8-25

8.7.14 Shutdown Strap ............................................................................................................... 8-25

8.7.15 Other Jumpers on the 1A2A4 PCC ................................................................................. 8-26

8.8 Disassembly and Repacking ........................................................................................... 8-26

SECTION III Installation Checkout ................................................................................................ 8-27

8.9 Initial Adjustments ........................................................................................................... 8-27

8.9.1 Prior to Turn-on ............................................................................................................... 8-27

8.9.2 Initial Turn-On and GCAL Adjustment ............................................................................ 8-27

8.9.3 North Alignment .............................................................................................................. 8-28

8.9.4 Installation Verification Test ............................................................................................ 8-28

Appendix A TACAN Configuration VI BITE Limits .......................................................................... A-1

Appendix B TACAN Antenna System Diagnostics ......................................................................... B-1

Appendix C Antenna Monitor Fault Isolations ................................................................................. C-1

Appendix D Column Beacon Shutdown Conditions ........................................................................ D-1

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

FOLDOUT DIAGRAMS AND SCHEMATICS .................................................................................... FP-1 viii Change 2

LIST OF ILLUSTRATIONS

Figure Title Page

1-1 OE-537/FRN TACAN Antenna Group, Relationship of Units ................................................. 1-4 1-2 1A1 AS-4437/FRN TACAN Antenna ....................................................................................... 1-5 1-3 1A2 O-1882/FRN Modulation Generator ................................................................................ 1-6 2-1 Modulation Generator Front Panel Controls and Indicators ................................................... 2-2 2-2 Modulation Generator Chassis Controls, PCC, and Connectors ............................................ 2-6 2-3 Antenna Connectors and Humidity Control System ................................................................ 2-9 3-1 TACAN/DME Pulse Characteristics ........................................................................................ 3-3 3-2 Azimuth Radiation Pattern ...................................................................................................... 3-4 3-3 TACAN Far Field Signal as Received by Aircraft .................................................................... 3-5 3-4 OE-537/FRN TACAN Antenna Group, Overall Functional Block Diagram ............................. 3-6 3-5 Antenna Pattern Rotation ........................................................................................................ 3-8 5-1 Modulation Generator Test Sample Waveform ....................................................................... 5-6 5-2 Vertical Column Arrays 1A1A1 Through 1A1A36 Microwave Schematic Diagram ................ 5-19 5-3 Azimuth Feed 1A1A37, 1A1A38, and 1A1A39, Microwave Schematic Diagram ................... 5-20 5-4 PIN Diode Modulator, Schematic Diagram ............................................................................. 5-21 5-5 1A1A40 3-Way Power Divider Microwave Schematic Diagram .............................................. 5-22 5-6 1A1W41 Antenna Monitor Cable, Schematic Diagram ........................................................... 5-23 5-7 1A1W42 Modulation Drive Cable, Schematic Diagram .......................................................... 5-24 5-8 1AW43 Monitor Detector Cable, Schematic Diagram ............................................................. 5-25 5-9 1W1 Modulation Cable, Schematic Diagram .......................................................................... 5-26 5-10 1W2 Monitor Logic Cable, Schematic Diagram ...................................................................... 5-27 5-11 1W3 Beacon Interface Cable, Schematic Diagram ................................................................. 5-28 5-12 1W3 Beacon Interface Cable, Schematic Diagram (Cardion) ................................................ 5-29 5-13 1W3 Beacon Interface Cable, Schematic Diagram (Fernau) .................................................. 5-30 5-14 1W4 Power Input Cable, Schematic Diagram ......................................................................... 5-31 7-1 OE-537/FRN TACAN Antenna Group ..................................................................................... 7-4 7-2 Antenna Assembly P/N 11002646-1 ....................................................................................... 7-5 7-3 TACAN Modulation Generator Assembly ............................................................................... 7-7 7-4 Humidity Control Assembly ..................................................................................................... 7-8 8-1 System Interconnection ........................................................................................................... 8-2 8-2 AS-4437/FRN TACAN Antenna Installation and Mounting Data ............................................ 8-3 8-3 O-1882/FRN Modulation Generator Installation and Mounting Data ...................................... 8-4 8-4 Typical Vertical Pattern of OE-537/FRN Antenna ................................................................... 8-6 8-5 Antenna Setup Showing Direct and Reflected Rays ............................................................... 8-7 8-6 OE-537/FRN 24 Feet Above Ground ...................................................................................... 8-8 8-7 Grazing Angles for Nulls as a Function of Antenna Height ..................................................... 8-9 8-8 Coverage Chart ....................................................................................................................... 8-11 8-9 Distance to Mean Reflection Point for Nulls as a Function of Antenna Height ....................... 8-12 8-10 Fresnel Zones for a TACAN Site ............................................................................................. 8-13

Change 2 ix

LIST OF ILLUSTRATIONS (Continued)

Figure Title Page

8-11 Roughness Criteria ................................................................................................................. 8-15 8-12 Jumper Installation 1A2A4 ...................................................................................................... 8-21 8-13 Jumper Installation 1A2A3 ...................................................................................................... 8-22 FO-1 Block Diagram, Antenna, 1A1 ................................................................................................. FP-1 FO-2 Block Diagram, Modulation Generator, 1A2 ........................................................................... FP-3 FO-3 Software Flow Diagram ........................................................................................................... FP-5 FO-4 Block Diagram, Clocks and Trigger Generator Circuitry ......................................................... FP-7 FO-5 Block Diagram, Microprocessor Circuitry ................................................................................ FP-9 FO-6 Block Diagram, Digital Drive Circuitry ..................................................................................... FP-11 FO-7 Block Diagram, Digital BITE Circuitry ..................................................................................... FP-13 FO-8 Block Diagram, Analog Circuitry ............................................................................................. FP-15 FO-9 Block Diagram, Operator Interface and Front Panel ............................................................... FP-17 FO-10 Fault Logic Diagram (6 sheets) ............................................................................................... FP-19 FO-11 Schematic Diagram, Antenna Monitor, PCC 1A1A40A1 ..............................