Racal Instruments AN/TRC-207 Troubleshooting guide

TO 31R2-2TRC207-1
OPERATION AND MAINTENANCE INSTRUCTIONS
WITH ILLUSTRATED PARTS BREAKDOWN
ORGANIZATIONAL LEVEL
RADIO SET
AN/TRC-207
(BI-DIRECTIONAL REPEATER)
RACAL COMMUNICATIONS, INC.
5 RESEARCH PLACE
ROCKVILLE, MD 20850
CONTRACT NO: F19628-91-D-0012
DISTRIBUTION STATEMENT B - Distribution authorized to U.S. Government agencies only for administrative
or operational use 15 August, 1996. Other requests for this document shall be referred to Sacramento ALC/TILBE,
3200 Peacekeeper Way, Suite 1, McClellan AFB, CA 95652-1026.
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.
HANDLING AND DESTRUCTION NOTICE - Handle in compliance 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
15 JULY 1997

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TABLE OF CONTENTS
Chapter Page
LIST OF ILLUSTRATIONS......................................................................................................................................... IV
LIST OF TABLES.......................................................................................................................................................... V
SAFETY SUMMARY................................................................................................................................................... VI
FOREWORD................................................................................................................................................................. IX
CHAPTER 1 GENERAL INFORMATION............................................................................................................ 1-3
1-1 DESCRIPTION AND PURPOSE................................................................................................................. 1-3
1-1.1 Equipment Function and Purpose ........................................................................................................1-3
1-1.2 Equipment Description ........................................................................................................................1-3
1-2 LEADING PARTICULARS .........................................................................................................................1-5
1-3 CAPABILITIES AND LIMITATIONS........................................................................................................1-6
1-4 EQUIPMENT SUPPLIED ............................................................................................................................ 1-7
1-5 EQUIPMENT REQUIRED BUT NOT SUPPLIED..................................................................................... 1-8
1-6 SPECIAL TOOLS AND TEST EQUIPMENT.............................................................................................1-8
1-7 RELATED TECHNICAL MANUALS.........................................................................................................1-8
CHAPTER 2 INSTALLATION ...............................................................................................................................2-1
2-1 INTRODUCTION......................................................................................................................................... 2-1
SECTION I. INSTALLATION LOGISTICS ................................................................................................................2-1
2-2 SITE PREPARATION..................................................................................................................................2-1
2-3 UNPACKING AND INSPECTIONS. .......................................................................................................... 2-1
2-4 HOUSING..................................................................................................................................................... 2-3
2-5 RECEIVING DATA. ....................................................................................................................................2-3
2-6 MATERIAL HANDLING. ...........................................................................................................................2-3
2-7 CABLES........................................................................................................................................................2-4
2-8 BUILDING AND OTHER SUPPORTING STRUCTURES........................................................................2-4
SECTION II. INSTALLATION PROCEDURES .........................................................................................................2-5
2-9 SPECIAL TOOLS AND EQUIPMENT REQUIRED FOR FIELD INSTALLATION................................2-5
2-10 INSTALLATION SEQUENCE .................................................................................................................... 2-5
2-10.1 Antenna/Mast Installation ....................................................................................................................2-5
2-10.2 Lithium Battery Installation. ................................................................................................................2-9
2-10.3 Ground Rod Installation.......................................................................................................................2-9
2-10.4 External Power Supply.........................................................................................................................2-9
2-10.5 Diplexer Installation.............................................................................................................................2-9
2-10.6 Receiver-Transmitter Transceiver Module Installation........................................................................2-9
CHAPTER 3 PREPARATION FOR USE AND RESHIPMENT .........................................................................3-1
3-1 INTRODUCTION......................................................................................................................................... 3-1
SECTION I. PREPARATION FOR USE...................................................................................................................... 3-1
3-2 INSPECTION. .............................................................................................................................................. 3-1
3-3 POST-INSTALLATION CHECKOUT. .......................................................................................................3-1
3-3.1 Preliminary...........................................................................................................................................3-1
3-3.2 Alignment and Adjustment. .................................................................................................................3-2
3-3.3 Post-Installation Checkout Procedures ................................................................................................3-2
SECTION II. PREPARATION FOR RESHIPMENT ................................................................................................... 3-2
3-4 PREPARING UNIT FOR RESHIPMENT....................................................................................................3-2
3-5 PACKING. ....................................................................................................................................................3-3
3-6 HANDLING AND STORAGE. .................................................................................................................... 3-3
3-6.1 Protective Measures for Electrical Connectors. ................................................................................... 3-3
3-6.2 Preparation for Shipment and Storage. ................................................................................................3-3
3-6.3 Handling. .............................................................................................................................................3-3
CHAPTER 4 OPERATION......................................................................................................................................4-1
SECTION I. CONTROLS AND INDICATORS...........................................................................................................4-1
4-1 INTRODUCTION......................................................................................................................................... 4-1

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ii
4-2 CONTROLS AND INDICATORS................................................................................................................4-1
4-2.1 Indicators, Controls, and Switches. ......................................................................................................4-1
4-2.2 Power Supply Switches and Connectors. .............................................................................................4-1
4-2.3 Connectors............................................................................................................................................4-1
Diplexer Control................................................................................................................................................4-1
SECTION II. OPERATING INSTRUCTIONS .............................................................................................................4-7
4-3 OPERATING MODES AND FREQUENCY RECOMMENDATIONS ......................................................4-7
4-3.1 Operating Modes..................................................................................................................................4-7
4-3.2 Frequency Recommendations...............................................................................................................4-7
4-4 INITIAL POWER-UP AND DIPLEXER TUNING PROCEDURES.........................................................4-11
4-5 RECEIVING AND RETRANSMITTING MESSAGES.............................................................................4-12
4-6 COVERT OPERATIONS............................................................................................................................4-13
4-7 RECEIVER-TRANSMITTERS ..................................................................................................................4-13
4-8 EQUIPMENT SHUTDOWN ......................................................................................................................4-13
SECTION III. EMERGENCY OPERATION..............................................................................................................4-13
4-9 EMERGENCY POWER..............................................................................................................................4-13
4-10 ELECTROMAGNETIC PULSE PROTECTION........................................................................................4-13
4-10.1 EMP Susceptibility.............................................................................................................................4-13
4-10.2 EMP Protective Measures ..................................................................................................................4-13
4-11 NUCLEAR, BIOLOGICAL, AND CHEMICAL (NBC) CONTAMINATION..........................................4-14
CHAPTER 5 THEORY OF OPERATION ............................................................................................................ 5-1
SECTION I. FUNCTIONAL SYSTEM(S) OPERATION ............................................................................................5-1
5-1 GENERAL.....................................................................................................................................................5-1
5-2 FUNCTIONAL SYSTEM(S) OPERATION.................................................................................................5-1
5-2.1 +15V DC-DC Converter Circuit Card Assembly (CCA) (A1A1) ........................................................5-1
5-2.2 Repeater Control/Audio Circuit Card Assembly (CCA) (A1A2) .........................................................5-1
5-2.3 Repeater Interface CCA (A1A3) ..........................................................................................................5-1
5-2.4 Parent Board Circuit Card Assembly (CCA) (A1A4) ..........................................................................5-1
5-2.5 Control Panel (A1A5) ..........................................................................................................................5-1
5-2.6 RF Power Amplifier Assembly (A1A6) ...............................................................................................5-1
5-2.7 RF Matrix CCA (A1A7).......................................................................................................................5-2
5-2.8 Receiver-Transmitters ..........................................................................................................................5-2
5-2.9 Antenna System....................................................................................................................................5-3
5-2.10 Diplexer (A3) .......................................................................................................................................5-3
5-2.11 AC/DC Power Supply (A2)..................................................................................................................5-3
SECTION II. FUNCTIONAL OPERATION OF ELECTRONIC CIRCUITS..............................................................5-3
5-3 REPEATER CONTROL/AUDIO CIRCUIT CARD ASSEMBLY (CCA) (A1A2)......................................5-3
5-4 15 WATT POWER AMPLIFIER ASSEMBLY (A1A6) ..............................................................................5-4
SECTION III. FUNCTIONAL OPERATION OF MECHANICAL ASSEMBLIES.....................................................5-4
CHAPTER 6 MAINTENANCE............................................................................................................................... 6-1
6-1 GENERAL.....................................................................................................................................................6-1
6-2 OPERATIONAL CHECKOUT.....................................................................................................................6-1
6-2.1 Power-up Verification. .........................................................................................................................6-1
6-2.2 Display Off Control..............................................................................................................................6-1
6-2.3 Radio A Tune Mode Verification.........................................................................................................6-2
6-2.4 Radio B Tune Mode Verification.........................................................................................................6-2
6-2.5 Fault LED.............................................................................................................................................6-3
6-3 SERVICING. .................................................................................................................................................6-3
6-3.1 Servicing Intervals................................................................................................................................6-3
6-3.2 Inspection. ............................................................................................................................................6-3
6-3.3 Preventive Maintenance. ......................................................................................................................6-3
6-4 TROUBLESHOOTING.................................................................................................................................6-4
6-5 REMOVAL/REPLACEMENT PROCEDURES ...........................................................................................6-9
6-5.1 Removal/Replacement Procedures - Operator......................................................................................6-9
6-5.2 Removal/Replacement Procedures - Repair Specialist.......................................................................6-12

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iii
CHAPTER 7 ILLUSTRATED PARTS BREAKDOWN........................................................................................7-1
SECTION I. INTRODUCTION .................................................................................................................................... 7-1
7-1 GENERAL ....................................................................................................................................................7-1
7-2 MAINTENANCE PARTS LIST ................................................................................................................... 7-1
7-3 NUMERICAL INDEX.................................................................................................................................. 7-2
7-4 REFERENCE DESIGNATION INDEX.......................................................................................................7-3
7-5 ELECTROSTATIC DISCHARGE (ESD) SENSITIVE DEVICES. ............................................................ 7-3
7-6 CAGE CODE SUMMARY...........................................................................................................................7-4
SECTION II. MAINTENANCE PARTS LIST .............................................................................................................7-8
CHAPTER 8 CIRCUIT DIAGRAMS...................................................................................................................... 8-1
8-1 SCOPE ..........................................................................................................................................................8-1
GLOSSARY
ALPHABETICAL INDEX

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iv
LIST OF ILLUSTRATIONS
Figure Page
Figure 1-1. Radio Set AN/TRC-207........................................................................................................................... 1-0
Figure 1-2. Receiver-Transmitter RT-1695/TRC-199................................................................................................ 1-4
Figure 1-3. BDR Diplexer.......................................................................................................................................... 1-4
Figure 2-1. Packaging Diagram for the BDR............................................................................................................. 2-2
Figure 2-2. Antenna Mast/Antenna Installation (Sheet 1 of 6).................................................................................. 2-5
Figure 2-3. Antenna Mast/Antenna Installation (Sheet 2 of 6).................................................................................. 2-6
Figure 2-4. Antenna Mast/Antenna Installation (Sheet 3 of 6).................................................................................. 2-6
Figure 2-5. Antenna Mast/Antenna Installation (Sheet 4 of 6).................................................................................. 2-7
Figure 2-6. Antenna Mast/Antenna Installation (Sheet 5 of 6)................................................................................... 2-7
Figure 2-7. Antenna Mast/Antenna Installation (Sheet 6 of 6)................................................................................... 2-8
Figure 4-1. Location of Bi-Directional Repeater Indicators, Controls, and Switches ................................................ 4-1
Figure 4-2. Location of Power Supply Switches (Power Supply Top View) ............................................................. 4-3
Figure 4-3. Location of Power Supply Connectors (Power Supply Side View)......................................................... 4-4
Figure 4-4. Location of Bi-Directional Repeater Unit Connectors............................................................................. 4-5
Figure 4-5. Location of Bi-directional Repeater Diplexer Controls........................................................................... 4-6
Figure 4-6. Standard BDR Cabling Set-up............................................................................................................... 4-10
Figure 4-7. BDR Cross-Banding Cabling Set-up ..................................................................................................... 4-10
Figure 5-1. Bi-directional Repeater System, Functional Block Diagram................................................................... 5-2
Figure 5-2. Repeater Control/Audio CCA (A1A2), Functional Block Diagram ........................................................5-5
Figure 5-3. 15 Watt Power Amplifier Assembly (A1A6), Functional Block Diagram............................................... 5-6
Figure 6-1. Detail of diplexer shock mount assembly .............................................................................................. 6-11
Figure 7-1. Radio Set AN/TRC-207 (Sheet 1 of 2)................................................................................................... 7-8
Figure 7-2. Bi-directional Repeater Assembly (4101027-501) (Sheet 1 of 3) ......................................................... 7-13
Figure 7-3. Power Amplifier Assembly, 15W (SS-4100853-501) ........................................................................... 7-19
Figure 8-1. Radio Set AN/TRC-207, Interconnection Diagram................................................................................. 8-3

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v
LIST OF TABLES
Table Page
Table 1-1. BDR Configurations (by Frequency Band) ...............................................................................................1-3
Table 1-2. Leading Particulars....................................................................................................................................1-5
Table 1-3. Capabilities and Limitations......................................................................................................................1-6
Table 1-4. Equipment Supplied ..................................................................................................................................1-7
Table 1-5. Equipment Required but Not Supplied......................................................................................................1-8
Table 1-6. Related Technical Manuals .......................................................................................................................1-8
Table 2-1. BDR Packaging.........................................................................................................................................2-3
Table 2-2. BDR Interconnecting Cables.....................................................................................................................2-4
Table 2-3. External Power Supply Switch Settings ....................................................................................................2-9
Table 4-1. Description of Indicators, Controls and Switches .....................................................................................4-2
Table 4-2. Description of Power Supply Switches .....................................................................................................4-3
Table 4-3. Description of Power Supply Connectors..................................................................................................4-4
Table 4-4. Description of Repeater Unit Connectors..................................................................................................4-5
Table 4-5. Description of Diplexer Controls ..............................................................................................................4-6
Table 4-6. TR Simplex Mode Recommended Frequencies ........................................................................................4-8
Table 4-7. TR Half-Duplex Mode Recommended Frequencies..................................................................................4-8
Table 4-8. Single BDR Recommended Frequencies...................................................................................................4-8
Table 4-9. Tandemed BDR Recommended Frequencies............................................................................................4-9
Table 5-1. Antenna System Frequency Band Vs Gain................................................................................................5-3
Table 6-1. Initial Switch and Control Settings for Power-Up Verification.................................................................6-1
Table 6-2. Initial Switch and Control Settings for Radio A Tune Mode Verification ................................................6-2
Table 6-3. Initial Switch and Control Settings for Radio B Tune Mode Verification.................................................6-2
Table 6-4. Recommended Service Intervals ...............................................................................................................6-3
Table 6-5. Organizational Maintenance Guide - Operator..........................................................................................6-5
Table 6-6. Organizational Maintenance Guide - Repair Specialist.............................................................................6-8
Table 6-7. Cross-Reference to Removal/Replacement Procedures.............................................................................6-9
Table 7-1. Radio Set AN/TRC-207 ..........................................................................................................................7-10
Table 7-2. Bi-directional Repeater Assembly (4101027-501)..................................................................................7-16
Table 7-3. Power AMP Assembly, 15W (SS-4100853-501)....................................................................................7-20

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vi
SAFETY SUMMARY
The following are general safety precautions that are not related to any specific procedure, and do not appear elsewhere
in this manual. These Safety Summaries are recommended precautions that all personnel must understand and apply
during any given phase of operation and maintenance. Each chapter has other specific warnings and cautions.
KEEP AWAY FROM LIVE CIRCUITS
Personnel must at all times observe all safety regulations. Do not replace components or make
adjustments inside equipment with power turned on. Under certain conditions, dangerous
voltages may exist when the power switch is in the off position due to charges retained by
capacitors. To avoid injury, always remove power and discharge and ground a circuit before
touching it.
RESUSCITATION
Personnel working with or near high voltages should be familiar with modern methods of
resuscitation. Such information may be obtained from the Director of Base Medical Services.
Lithium oxide batteries or cells may be used in the battery enclosure and receiver-transmitters used in this equipment.
They are potentially hazardous if misused or tampered with before, during or after discharge. The following precautions
must be strictly observed to prevent possible injury to personnel or equipment damage.
Do not heat, incinerate, crush, puncture, disassemble, or otherwise mutilate the batteries.
Do not short-circuit, recharge, or bypass internal fuse.
Do not store batteries in equipment during long periods of non-use (in excess of 30 days).
Turn off the equipment immediately if you detect battery compartment becoming unduly hot, hear battery cells
venting (hissing sounds), or smell irritating sulfur dioxide gas.
WARNING
WARNING
LITHIUM BATTERIES

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vii
VOLTAGES WITHIN THIS EQUIPMENT ARE HIGH ENOUGH TO ENDANGER LIFE.
Covers are not to be removed except by persons qualified and authorized to do so and these persons should always take
extreme care once the covers have been removed.
Page
2-1 WARNING - Installation of the bi-directional repeater requires a minimum of two people.
2-1 WARNING - Removing the bi-directional repeater assembly from the shipping carton requires a
minimum of two persons.
2-5 WARNING - Ensure proper use of safety tools (work gloves and hard hat) during assembly and
disassembly of antenna.
2-6 WARNING - Before using the hammer, ensure a wedge is placed in the top of the hammer so that the
hammer head does not come loose, thereby endangering personnel.
3-3, 6-10,
6-12
WARNING - Before performing removal/replacement procedures, make sure power is removed from
the unit by disconnecting from power source. Failure to do so could result in personal injury or
equipment damage.
6-11 WARNING - This equipment is capable of generating RF power sufficient to cause RF burns. During
transmit, care should be taken to eliminate the possibility of touching exposed RF output points such as
the center conductors of coaxial cables or antenna feedpoints.
2-1 CAUTION - Exercise care when removing units from packing material in order to prevent damage to the
unit.
3-3 CAUTION - Never apply pressure sensitive tape directly to connectors. This could damage connector
pins.
3-3 CAUTION - Package all electrostatic discharge (ESD) sensitive assemblies in ESD bags before shipping
or storing.
3-3 CAUTION - Rough handling may cause unnecessary damage to electronic assemblies.
3-3 CAUTION - Electronic assemblies containing solid-state devices are susceptible to damage from static
electrical discharges. Wear protective clothing and grounded wrist straps
3-3 CAUTION - Forcing any tilted or cocked electronic assembly into position may result in bent or broken
pins.
3-4 CAUTION - When repairing an electronic assembly, be careful that the tool employed does not
inadvertently press against leads, pins, or other parts that are easily bent.
3-4 CAUTION - Because of the miniaturization of parts for electronic assembly construction, the leads,
connectors, and pins have been stiffened to make them more rugged. As a result, such parts are brittle
and will break easily if bent too often or pulled on too hard. When handling an assembly that has been
removed from its chassis, be careful not to press against the leads and pins. When removing an assembly,
be sure to pull it straight out from the equipment. Do not cock, twist, pry, or carelessly jerk an electronic
assembly to remove it from the mounting or connector.
3-4 CAUTION - The bi-directional repeater contains components that are susceptible to damage by static
electrical charges. Disassembly of the bi-directional repeater should only be done at a properly grounded
work station.
6-12 CAUTION - The bi-directional repeater contains components that are susceptible to damage by static
electrical charges. Disassembly of the bi-directional repeater should only be done at a properly grounded
work station.
WARNING

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viii
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ix
FOREWORD
This manual meets the technical content requirements of specification MIL-M-38798B, paragraph 3.3 (1 December 1975)
and MIL-M-38807A (1 June 1982) and format requirements of specification MIL-M-38784B (16 April 1983) for the bi-
directional repeater.
a. Chapter 1 - General Information. This chapter provides general information for the bi-directional repeater
including equipment description and purpose, leading particulars, capabilities and limitations, equipment
supplied, equipment required but not supplied, optional equipment, special tools and test equipment, and
related technical manuals.
b. Chapter 2 - Installation. This chapter provides complete installation instructions for the receiver-transmitter
including installation logistics and installation procedure.
c. Chapter 3 - Preparation for Use and Reshipment. This chapter contains information which will permit
operation and maintenance personnel to prepare the equipment for use, including reference to post-
installation checkout procedures, preparing the unit for reshipment, packing, handling, and storage
procedures.
d. Chapter 4 - Operation. This chapter provides complete operating instructions for the bi-directional repeater.
e. Chapter 5 - Theory of Operation. This chapter provides complete theory of operation for the bi-directional
repeater.
f. Chapter 6 - Maintenance. This chapter provides all instructions required for on-equipment and off-
equipment maintenance of the bi-directional repeater. It includes preventive maintenance, troubleshooting
procedures, and repair procedures.
g. Chapter 7 - Illustrated Parts Breakdown (IPB). The IPB provides complete illustrated parts breakdown for
the bi-directional repeater. The IPB is prepared in accordance with MIL-M-38807A.
h. Chapter 8 - Circuit Diagrams. This chapter contains the BDR interconnection diagram.
i. Glossary - The glossary provides a definition of the special terms and abbreviations used in the technical
order.
j. Alphabetical Index - The index provides cross-references to applicable paragraphs, figures or tables.

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1-0
Legend for Figure 1-1:
1. Bi-directional Repeater (BDR) Assembly (A1)
2. Cable Assembly, PS Power (W1)
3. Cable Assembly, Coaxial, RF (W2)
4. Strap Assembly, Ground (W5)
5. Power Supply (A2) (includes Power Supply Enclosure and Battery Enclosure)
6. Cable Assembly, Coaxial, RF (W4)
7. Weldment, Repeater Frame
8. Diplexer Assembly, 30-88 MHz (A3)
9. Cable Assembly, Coaxial, RF (W3)
10. Strap Assembly, Ground (W6)
11. Strap Assembly, Ground (W7)
12. Antenna, 403-470 MHz
13. Antenna, Mast, TR
14. Antenna, 136-174 MHz
15. Antenna, 30-88 MHz
16. Receiver-Transmitter RT-1695/TRC-199 Unit (A4, A5)
16a. Additional transceiver modules (p/o Receiver-Transmitter RT-1695/TRC-199)
17. Diplexer Assembly, 136-174 MHz (A3)
18. Case, Transit, Diplexer
19. Diplexer Assembly, 403-470 MHz (A3)
20. Rod Assembly, Ground
21. Cable, Coaxial, Antenna (W10)
22. Cable Assembly, 240 VAC, Power (W9)
23. Cable Assembly, 120 VAC, Power (W9)
24. Cable Assembly, 10-32 VDC, Power (W9)
25. Case, Transit, Diplexer
26. Cover, Frame
Figure 1-1. Radio Set AN/TRC-207
(Sheet 1 of 3)

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1-1
Figure 1-1. Radio Set AN/TRC-207
(Sheet 2 of 3)

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1-2
Figure 1-1. Radio Set AN/TRC-207
(Sheet 3 of 3)
12
13
14 15
13 13
21
21 21
19
16
a16
17
18
26
25
20
21
22
23
24

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1-3
CHAPTER 1 GENERAL INFORMATION
1-1 DESCRIPTION AND PURPOSE.
1-1.1 Equipment Function and Purpose
Radio Set AN/TRC-6728 (hereinafter referred to as the bi-directional repeater or BDR) is a communications unit capable
of operating in the 30-88, 136-174, or 403-470 Megahertz (MHz) frequency bands. It is used to extend the
communications range of fixed, mobile, or portable receiver-transmitters. The BDR is COMSEC (Communications
Security) transparent and provides repeater capability for all modes without the need for COMSEC encryption/decryption.
1-1.2 Equipment Description
(See Figure 1-1.) The BDR includes a bi-directional repeater assembly, two non-CCI (Controlled Cryptographic Item)
Receiver-Transmitter Sets, Radio RT-1695/TRC-199 (hereinafter referred to as the receiver-transmitters), three antenna
systems, an antenna mast, three diplexers, a tubular (weldment) frame, a power supply enclosure, and a battery enclosure.
1-1.2.1 BDR Unit.
(See Figure 7-2.) The BDR unit includes three circuit card assemblies (CCAs) that are accessible through a removable
cover on the underside of the unit. These are the +15 volt (V) DC-DC converter CCA (A1), repeater control/audio CCA
(A2), and repeater interface (A3). These CCAs plug into the parent board (A4), which interfaces with the control panel
assembly (A5), power amplifier assembly (A6), the RF matrix CCA (A7), the external power supply, and the plug-in
receiver-transmitters. The receiver-transmitters plug into sleeves (A8, A9) located on the left and right sides of the front
panel of the BDR unit. The power amplifier (A6) is mounted under a heatsink on top of the BDR unit.
1-1.2.2 Receiver-Transmitters.
(See Figure 1-2.) The receiver-transmitters provide transmit/receive communication in the 30-88, 136-174, or 403-470
MHz frequency bands. The operating band of the receiver-transmitters is determined by the transceiver module installed.
When the transceiver modules are changed, the BDR must be fitted with the proper antenna and diplexer. The proper
configurations are listed in Table 1-1.
Table 1-1. BDR Configurations (by Frequency Band)
Frequency Band Receiver-Transmitter Antenna Diplexer
30-88 MHz
136-174 MHz
403-470 MHz
SS-4100820-501
SS-4100821-501
SS-4100822-501
4242-MK2-RAC
4265-RAC
4266-RAC
SS-1600322-501
SS-1600322-502
SS-1600322-503
NOTE
The CCI Receiver-Transmitter RT-1696/U(C) is mechanically different from the RT-1695/TRC-
199 to prevent full insertion into the BDR sleeves to avoid the possibility of leaving a CCI radio
in an unattended repeater.
1-1.2.3 Antenna Assembly.
The BDR antenna system provides half-duplex transmit and receive capability over one of three bands of operation. The
selected antenna is mast mounted. Three antennas are provided to cover the three bands of operation. Refer to Table 1-1.
A mast is provided to elevate the selected antenna up to 10 feet (in 5 foot increments) to increase transmission range and
quality of transmitted and received signals. The antennas and mast can be installed on a roof or existing tower to further
increase range.

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1-4
Figure 1-1Figure 1-2. Receiver-Transmitter RT-1695/TRC-199
1-1.2.4 Diplexer.
(See Figure 1-3.) The BDR diplexer provides a method of using a receiver and a transmitter on a common antenna. The
diplexer has three coaxial connector ports - one port connects to the antenna via the power supply and the other two
connect to the Radio A and Radio B ports on the BDR. The diplexer, when properly tuned, provides a transmitter-to-
receiver isolation of 70 decibels (dB) at any frequency spacing of 4 MHz or 3% of the operating frequency, whichever
is greater. There are three separate diplexers, one for each frequency band. The frequency band of the diplexer must
correspond to that of the receiver-transmitter and antenna.
Legend for Figure 1-3
(136-174 MHz and 403-470 MHz diplexers have the same controls, but their appearance is slightly different):
1. Tuning Meter 3. RCV Frequency Meter and Tuning Knob 5. TUNE Pushbutton
2. SENS Control 4. XMT Frequency Meter and Tuning Knob
Figure 1-3. BDR Diplexer

TO 31R2-2TRC207-1
1-5
1-1.2.5 Power Supply Assembly.
The power supply assembly provides power for the operation of the BDR. The power supply will operate from any direct
current (DC) voltage between 10 and 32 volts and from 120/240 or 220 volts alternating current (VAC). The operation
of the power supply is controlled by the AC/OFF/DC and internal/external (INT/EXT) DC switches on the power supply.
The power supply assembly consists of the power supply enclosure and the battery enclosure, which are mounted on a
tray that is bolted to the BDR frame. There are two circuit breakers located on the side of the power supply enclosure
that must be in the ON position for BDR operation.
1-1.2.5.1 Power Supply Enclosure.
The power supply enclosure provides the BDR with regulated 28 VDC power and unregulated 15 VDC power. The
power supply enclosure includes a +28V DC-DC converter CCA (A2) and circuit breakers for the AC and DC input lines.
1-1.2.5.2 Battery Enclosure.
The battery enclosure is a weather-resistant container that can hold up to four of either Type BA-5590/U Lithium batteries
or Type BB-590/U NiCd batteries. The battery connectors are mounted in the bottom of the battery enclosure box. (For
battery installation see paragraph 2-10.2.)
1-2 LEADING PARTICULARS
Leading particulars for the BDR are given in Table 1-2.
Table 1-2. Leading Particulars
Characteristic Parameter
Equipment dimensions and weight
(BDR assembly - does not include antennas,
antenna cable, or mast):
Length
Width
Height
Volume
Weight (30-88 MHz configuration -
BDR unit w/radios, power supply,
diplexer, frame)
28.4 inches (in.) (72.0 centimeters (cm))
18.9 in. (48.0 cm)
18.9 in. (48.0 cm)
10145 cubic in. (166,247 cubic cm)
140.0 pounds (lbs) (63.5 kilograms (kg))
Environmental requirements:
Temperature:
Operating
Storage
Humidity
-40°Celsius (C) (-40°Fahrenheit (F)) to +49°C (120°F)
-51°C (-60°F) to +68°C (155°F)
0 to 95 percent relative humidity
Electrical power requirements 10V to 32V DC Battery Power
120/240 "10% (1 phase, 3 wire) at 50/60 Hertz (Hz)
220 VAC "10% (1 phase, 3 wire) at 50 Hz
Nominal power consumption 24 VDC
Transmit 2W - 2500 mA
Transmit 10W - 5000 mA
Standby - 500 mA

TO 31R2-2TRC207-1
1-6
1-3 CAPABILITIES AND LIMITATIONS
Capabilities and limitations of the BDR are given in Table 1-3.
Table 1-3. Capabilities and Limitations
Characteristic Parameter
Frequency Range (RCV and XMT) 30-88 MHz
136-174 MHz
403-470 MHz
Transmitter Output 2 and 10 watts selectable
Security BDR is COMSEC transparent (contains no COMSEC
equipment). Equipment will receive and re-transmit analog
(nonsecure), 12 kbps (secure), and 16 kbps (secure) FM signals
Interoperability Radio Set AN/PRC-139/U (C)
AN/PRC-77 Manpack Radio
Radio Set AN/PRC-128
Radio Set AN/GRC-238
Adapter Group OF-228/U
Radio Set AN/TRC-199
SINCGARS-V (single channel)
FED-STD-1023 compatible, 12 kbps secure voice
VINSON (KY-57) compatible, 16 kbps secure voice
Analog 12.5 and 25 kHz frequency modulated (FM) radios
Receiving/Transmitting 25 kilohertz (kHz) Bandwidth on all frequency bands
12.5 kHz Bandwidth on 136-174 MHz and 403-470 MHz
bands
12.5 kHz tuning steps
Channels (receive and transmit) 14 channels each programmable with frequency bandwidth,
output power, and squelch tones as variables (squelch tones
available only in receive)
Adjacent Channel Selectivity 50 dB over 30-88 MHz, 25.0 kHz Bandwidth
52 dB over 136-174 MHz, 12.5 kHz Bandwidth
60 dB over 136-174 MHz, 25.0 kHz Bandwidth
40 dB over 403-470 MHz, 12.5 kHz Bandwidth
48 dB over 403-470 MHz, 25.0 kHz Bandwidth
Sensitivity Analog (nonsecure) voice: -113 dBm or 0.50µV for 12 dB
SINAD.
Digital: -105 dBm.
Spurious Response and Image Rejection 65 dB.
Intermodulation Spurious Response 60 dB.

TO 31R2-2TRC207-1
1-7
1-4 EQUIPMENT SUPPLIED
Equipment supplied with Radio Set AN/TRC-207 is listed in Table 1-4.
Table 1-4. Equipment Supplied
Official Nomenclature Part Number Quantity
BDR Assembly
Power Supply Assembly
$Power Supply Enclosure
$Battery Enclosure
Diplexer Assembly, 30-88 MHz
Diplexer Assembly, 136-174 MHz
Diplexer Assembly, 403-470 MHz
Antenna, 30-88 MHz
Antenna 136-174 MHz
Antenna, 403-470 MHz
Mast, Antenna BDR
Case, Transceiver
Ground Rod Assembly
Receiver/Transmitter Set,
$Radio RT-1695/TRC-199
$$ System Module, w/o COMSEC
$$ Transceiver Module, 30-88 MHz
$$ Transceiver Module, 136-174 MHz
$$ Transceiver Module, 403-470 MHz
Cable Assembly, BDR Power
Cable Assembly, Coaxial, RF
Cable Assembly, Coaxial, RF
Cable Assembly, Coaxial, RF
Strap Assembly, Ground
Strap Assembly, Ground
Strap Assembly, Ground
Cable Assembly, Power Supply, 120 VAC Input
Cable Assembly, Power Supply, 240 VAC Input
Cable Assembly, Power Supply, DC
Cable Assembly, Coaxial, Antenna
Bumpers, Tactical repeater Frame
Bushing, Shock Mount
Clamp, Rear
Clamp, Front
Frame, Weldment
Case, Transit, Diplexer
Case, Transit, Diplexer
Cover, Frame
4101027-501
4101028-501
SS-1600322-501
SS-1600322-502
SS-1600322-503
4242-MK2-RAC
4265-RAC
4266-RAC
SP10SS
SS-3100552-501
SS-3100551-501
SS-4100807-512
SS-4100819-502
SS-4100820-501
SS-4100821-501
SS-4100822-501
4500117-501
SS-3500292-504
SS-3500292-505
SS-3500292-503
SS-3500279-502
SS-3500279-503
SS-3500279-504
SS-4500107-501
SS-4500108-501
SS-4500109-501
CPRG223/U-30-XX
SS-3400353-1
SS-2400577-1
SS-3100546-501
SS-3400355-1
SS-4400225-1
275-160-100-000
275-160-070-000
IC-3300RC
1
1
1
1
1
1
1
1
1
2
1
2
2
2
2
2
1
1
1
1
1
1
1
1
1
1
1
24
8
1
1
1
1
1
1

TO 31R2-2TRC207-1
1-8
1-5 EQUIPMENT REQUIRED BUT NOT SUPPLIED
Table 1-5 lists equipment required but not supplied.
Table 1-5. Equipment Required but Not Supplied
Equipment Part Number
Programmer Unit, Frequency Radio MX-11531/U SS-4100797-501
Cloning Cable SS-3500272-501
Antenna Cable (for cross-banding operation) CPRG223/U-30-XX
Antenna Mast Kit (for cross-banding operation) SP10SS
Batteries (if internal DC power operation selected) Lithium Type BA-5590/U or NiCad
Type BB-590/U
NiCad Battery Charger/Conditioner (if NiCad BB-590/U
batteries used)
MRC-590
1-6 SPECIAL TOOLS AND TEST EQUIPMENT
There are no special tools or test equipment required for maintenance.
1-7 RELATED TECHNICAL MANUALS
Table 1-6 lists related technical manuals.
Table 1-6. Related Technical Manuals
Publication Number Publication Title
31R2-2PRC139-1 Operation and Maintenance Instructions with Illustrated Parts Breakdown
(Organizational Level) for Radio Set AN/PRC-139(C) (includes
RT-1695/TRC-199, RT-1696/U (C), Programmer Unit, Frequency, Radio
MX-11531/U, Battery Chargers, and Battery Reconditioner)
31R2-2GRC238-1 Operation and Maintenance Instructions with Illustrated Parts Breakdown
(Organizational Level) for Radio Set AN/GRC-238
31R2-4-1085-1 Operation and Maintenance Instructions with Illustrated Parts Breakdown
(Organizational Level) for Adapter Group OF-228/U
31R2-2TRC207-1 Operation and Maintenance Instructions with Illustrated Parts Breakdown
(Organizational Level) for Radio Set AN/TRC-207
31R2-2PRC-139-06 Work Unit Code Manual
35C3-2-113-2 NiCad Battery Reconditioner, MRC-590