TM-32-5985-200-15
TM 32-5985-200-15
D E P A R T M E N T
O F
T H E
A R M Y
T E C H N I C A L
M A N U A L
OPERATOR, ORGANIZATIONAL, DIRECT SUPPORT,
GENERAL SUPPORT AND DEPOT MAINTENANCE MANUAL
ANTENNA SYSTEM,
QRC-280 (A)
This publication is not available through AG Publication
Channels.
Requisition through Commander, US Army
Security Agency, Materiel Support Command, Vint Hill
Farms, Warrenton, VA 22186.
H E A D Q U A R T E R S ,
D E P A R T M E N T
J A N U A R Y
1 9 6 8
O F
T H E
A R M Y
HANDBOOK OF OPERATING
AND
MAINTENANCE INSTRUCTIONS
FOR
QRC-280(A) ANTENNA SYSTEM
September 1, 1967
(Revised January 22, 1968)
Contract F30602-67-C-0155
CE-1008
LIST OF EFFECTIVE PAGES
TOTAL NUMBER OF PAGES IS 232, AS FOLLOWS:
Page No.
Issue
Title
A
± through v
vi
vii through viii
1-0
1-1
1-2 through 1-3
1-4 through 1-5
1-6
1-7 through 1-8
1-9
1-10
1-11 through 1-15
1-16
1-17 through 1-26
1-27
1-28 through 1-35
2-1 through 2-2
2-3
2-4
2-5 through 2-52
3-1 through 3-2
3-3
3-4 through 3-13
4-1
4-2 through 4-11
5-1 through 5-11
5-12
5-13 through 5-40
5-41
5-42 through 5-43
Blank
5-45 through 5-47
Page No.
22 January 1968
22 January 1968
Original
22 January 1968
Original
Original
22 January 1968
Original
22 January 1968
Original
22 January 1968
Original
22 January 1968
Original
22 January 1968
Original
22 January 1968
Original
22 January 1968
Original
22 January 1968
Original
Original
22 January 1968
Original
22 January 1968
Original
Original
22 January 1968
Original
22 January 1968
Original
5-48 through 5-60
5-61
5-62 through 5-111
APPENDIX I
Issue
Original
22 January 1968
Original
(To be published
later)
22 January 1968
The asterisk indicates pages revised, added or deleted by the current change.
A
CE-1008
TABLE OF CONTENTS
Page
SECTION I.
1.
GENERAL ...............................................................................................................................................
1-1
A.
B.
C.
Purpose and Scope of the Manual ................................................................................................
Purpose of the Equipment ............................................................................................................
Equipment Supplied......................................................................................................................
(1) Antenna System..................................................................................................................
(2) Antenna Pedestal ................................................................................................................
(3) Elevation Drive Assembly ...................................................................................................
(4) Type I Radome-Platform .....................................................................................................
(5) Antenna Control Power Supply............................................................................................
(6) Antenna Position Control Indicator ......................................................................................
(7) Scope..................................................................................................................................
Special Tools and Test Equipment................................................................................................
Condensed Data ...........................................................................................................................
(1) Equipment Specifications and Operating Characteristics .....................................................
(2) Special Design Features......................................................................................................
1-1
1-1
1-1
1-3
1-4
1-4
1-4
1-5
1-5
1-5
1-6
1-6
1-6
1-6
SYSTEM THEORY OF OPERATION ......................................................................................................
1-10
A.
B.
1-10
1-12
1-12
1-12
1-15
1-16
1-19
1-21
1-21
1-27
1-27
1-27
1-31
1-31
1-31
D.
E.
2.
GENERAL DESCRIPTION
C.
D.
E.
F.
General ........................................................................................................................................
Antenna Positioning and Drive Circuits .........................................................................................
(1) Antenna System Drive Circuits............................................................................................
(2) Manual Mode of Operation ..................................................................................................
(3) Slave Mode of Operation.....................................................................................................
(4) Scan Mode of Operation......................................................................................................
Cable-Wrap Circuits ..................................................................................................................... .
Polarization Diversity Control Circuits ..........................................................................................
Electromechanical Linear Actuator (Beam Broadener) and Indicator Circuits ................................
Radome-Platform Circuits.............................................................................................................
(1) Blower and Control Circuits .................................................................................................
(2) Pressure Safety Switches and Indicator Circuits ..................................................................
(3) Deicer Circuits.....................................................................................................................
(4) Utility Circuits ......................................................................................................................
(5) Intercom Circuit...................................................................................................................
i
CE-1008
TABLE OF CONTENTS (Cont)
Page
SECTION II.
INSTALLATION
1.
GENERAL ...............................................................................................................................................
2-1
2.
INSTALLATION TOOLS AND EQUIPMENT............................................................................................
2-1
3.
INSTALLATION CONSIDERATIONS AND GENERAL PROCEDURES...................................................
2-1
A.
B.
C.
General ........................................................................................................................................
Location of the Antenna System ...................................................................................................
Site Preparation and Equipment Unloading...................................................................................
(1) Equipment Unloading and Placement..................................................................................
3-1
2-1
2-1
2-3
ANTENNA SYSTEM SITE INSTALLATION PROCEDURES ...................................................................
2-3
A.
B.
C.
D.
E.
General ........................................................................................................................................
Removal of Transit Cover.............................................................................................................
80-Foot Tower Installation.............................................................................................................
Portable Stand and Hoisting Unit Installation ................................................................................
Assembling the System Inside the Radome ..................................................................................
2-3
2-4
2-4
2-5
2-7
CONTROL UNIT INSTALLATION PROCEDURES ..................................................................................
2-10
A.
B.
C.
D.
Antenna Control Power Supply .....................................................................................................
Antenna Position Control Indicator................................................................................................
Scope ...........................................................................................................................................
Installation ....................................................................................................................................
2-10
2-10
2-10
2-10
6.
ANTENNA PEDESTAL LEVELING PROCEDURES ................................................................................
2-10
7.
80-FOOT TOWER ERECTION PROCEDURES ......................................................................................
2-12
A.
B.
C.
D.
Assembled Tower .........................................................................................................................
Erection Equipment ......................................................................................................................
Erection Procedure .......................................................................................................................
Disassembly of Tower...................................................................................................................
2-12
2-12
2-12
2-39
8.
SYSTEM INTERCONNECTIONS ............................................................................................................
2-39
9.
BORESIGHTING PROCEDURE..............................................................................................................
2-39
A.
B.
Target Installation .........................................................................................................................
Check and Adjustment..................................................................................................................
2-39
2-45
EQUIPMENT RELOCATION ...................................................................................................................
2-45
4.
5.
10.
ii
CE-1008
TABLE OF CONTENTS (Cont)
Page
SECTION III.
OPERATION AND ADJUSTMENT
1.
GENERAL ...............................................................................................................................................
3-1
2.
RADOME INFLATION .............................................................................................................................
3-1
3.
ACTIVATING THE EQUIPMENT.............................................................................................................
3-3
A.
Initial Switch and Control Settings.................................................................................................
(1) Antenna Control Power Supply............................................................................................
(2) Antenna Position Control Indicator ......................................................................................
(3) Antenna Pedestal ................................................................................................................
3-3
3-3
3-3
3-3
PRE-OPERATIONAL TEST CHECK LIST ...............................................................................................
3-4
A.
Initial Turn-On Procedure..............................................................................................................
(1) Antenna Control Power Supply............................................................................................
(2) Antenna Position Control Indicator ......................................................................................
Static Accuracy Check..................................................................................................................
Limit Stop Check ..........................................................................................................................
Sector Scan Check .......................................................................................................................
Polarization Control Check ...........................................................................................................
Electromechanical Linear Actuator Check.....................................................................................
Safety Circuit Check .....................................................................................................................
3-4
3-4
3-4
3-5
3-6
3-7
3-7
3-7
3-8
SYSTEM ALIGNMENT AND ADJUSTMENT ...........................................................................................
3-8
A.
B.
C.
D.
E.
General .......................................................................................................................................
+24-Volt DC Regulated Adjustment ..............................................................................................
Beam Width Meter Adjustment .....................................................................................................
Cable Wrap Adjustment................................................................................................................
Sector Scan Adjustment. ..............................................................................................................
3-8
3-8
3-8
3-9
3-9
6.
OPERATING PRECAUTIONS.................................................................................................................
3-10
7.
SYSTEM OPERATING PROCEDURES ..................................................................................................
A.
General ........................................................................................................................................
B.
Manual Mode of Operation ...........................................................................................................
C.
Slave Mode of Operation ..............................................................................................................
D.
Scan Mode of Operation ...............................................................................................................
E.
Polarization Control ......................................................................................................................
F.
Beam Width Change ....................................................................................................................
3-11
3-11
3-11
3-11
3-11
3-12
3-12
8.
STOPPING PROCEDURES ....................................................................................................................
3-12
4.
B.
C.
D.
E.
F.
G.
5.
iii
CE-1008
TABLE OF CONTENTS (Cont)
Page
SECTION IV.
MAINTENANCE
1.
GENERAL ...............................................................................................................................................
4-1
2.
PERIODIC INSPECTION AND PREVENTIVE MAINTENANCE...............................................................
4-1
3.
TOOL REQUIREMENT ...........................................................................................................................
4-3
4.
TROUBLE ANALYSIS .............................................................................................................................
4-3
SECTION V.
1.
DESCRIPTION OF COMPONENTS
SYSTEMS DESCRIPTION ......................................................................................................................
5-1
A.
B.
General ........................................................................................................................................
Antenna System ...........................................................................................................................
(1) Description ..........................................................................................................................
(2) Parts List .............................................................................................................................
5-1
5-1
5-1
5-6
DESCRIPTION OF SYNCHROS .............................................................................................................
5-6
A.
B.
General ........................................................................................................................................
Types of Synchros Used ...............................................................................................................
(1) Synchro Transmitters ..........................................................................................................
(2) Control Transformers ..........................................................................................................
(3) Differential Control Transmitters..........................................................................................
Synchro Zeroing Procedures.........................................................................................................
(1) Control and Torque Transmitter...........................................................................................
(2) Control Transformer ............................................................................................................
(3) Differential Control Transmitter ...........................................................................................
5-6
5-6
5-6
5-6
5-7
5-7
5-7
5-8
5-9
3.
ANTENNA ...............................................................................................................................................
5-10
4.
ANTENNA VSWR TESTS AND TROUBLESHOOTING...........................................................................
5-11
A.
B.
VSWR Tests.................................................................................................................................
Troubleshooting ............................................................................................................................
5-11
5-11
POLARIZATION UNIT.............................................................................................................................
5-11
A.
B.
General Description and Theory of Operation ...............................................................................
Schematic Diagram and Parts List ................................................................................................
5-11
5-15
ELECTROMECHANICAL LINEAR ACTUATOR.......................................................................................
5-15
A.
B.
C.
5-15
5-15
5-17
2.
C.
5.
6.
General Description and Theory of Operation ...............................................................................
Adjustments..................................................................................................................................
Wiring Diagram and Parts List ......................................................................................................
iv
CE-1008
TABLE OF CONTENTS (Cont)
Page
SECTION V.
7.
DESCRIPTION OF COMPONENTS (coat)
ANTENNA PEDESTAL............................................................................................................................
5-17
A.
B.
General Description and Theory of Operation ...............................................................................
Adjustments and Repair................................................................................................................
(1) Limit Switch Adjustment ......................................................................................................
(2) Cable Wrap Adjustment ......................................................................................................
(3) Electric Brake, Installation and Adjustment..........................................................................
Schematic Diagram and Parts List ................................................................................................
5-17
5-21
5-21
5-25
5-25
5-27
ELEVATION DRIVE ASSEMBLY.............................................................................................................
5-27
A.
B.
General Description and Theory of Operation ...............................................................................
Adjustment and Repair .................................................................................................................
(1) Limit Switch Adjustment ......................................................................................................
Schematic Diagram and Parts List ................................................................................................
5-27
5-27
5-27
5-32
9.
RADOME-PLATFORM ............................................................................................................................
5-32
10.
PORTABLE STAND AND HOISTING UNIT.............................................................................................
A.
Description ...................................................................................................................................
B.
Parts List ......................................................................................................................................
5-32
5-32
5-37
11.
ELEVATION DRIVE ASSEMBLY HOIST.................................................................................................
5-37
A.
B.
Description ...................................................................................................................................
Parts List ......................................................................................................................................
5-37
5-37
80-FOOT TOWER...................................................................................................................................
5-37
A.
B.
Description ...................................................................................................................................
Parts List ......................................................................................................................................
5-37
5-37
ANTENNA POSITION CONTROL INDICATOR .......................................................................................
5-37
A.
B.
5-37
5-38
5-38
5-41
5-41
5-47
5-47
5-47
5-49
C.
8.
C.
12.
13.
C.
D.
General ........................................................................................................................................
Theory of Operation......................................................................................................................
(1) Function of Operating Controls and Indicators .....................................................................
(2) Location and Function of Test Points and Adjustments........................................................
(3) Scan Generator Theory of Operation...................................................................................
(4) Control Indicator Transmission Assembly ............................................................................
Alignment and Adjustment Procedures .........................................................................................
(1) Scan Clutch and Limit Switch Adjustment............................................................................
Schematic Diagram and Parts List ................................................................................................
v
CE-1008
TABLE OF CONTENTS (Cont)
Page
SECTION V.
14.
ANTENNA CONTROL POWER SUPPLY................................................................................................
5-49
A.
B.
General ........................................................................................................................................
Theory of Operation......................................................................................................................
(1) Function of Operating Controls and Indicators .....................................................................
(2) Location and Function of Test Points and Adjustments........................................................
Alignment and Adjustment Procedures .........................................................................................
Schematic Diagram and Parts List ................................................................................................
5-49
5-49
5-53
5-53
5-53
5-56
DIRECTION FINDING DISPLAY SCOPE ................................................................................................
5-56
A.
B.
C.
D.
E.
5-56
5-56
5-61
5-61
5-61
C.
D.
15.
DESCRIPTION OF COMPONENTS (cont)
General ........................................................................................................................................
Description of Modifications ..........................................................................................................
Modulator Circuit Board ................................................................................................................
Demodulator Circuit Board............................................................................................................
Writing Gun Relay Driver..............................................................................................................
APPENDIX I
LIST OF ILLUSTRATIONS
Figure
No.
1-1
1-2
1-3
1-4
1-5
1-6
1-7
1-8
1-9
1-10
1-11
Title
Antenna System QRC-280(A), Equipment Supplied......................................................................
Antenna System, PS-135-1, Overall Block Diagram .....................................................................
Antenna Positioning and Drive Circuits, Simplified Schematic Diagram ........................................
Scan Generator, Simplified Block Diagram ...................................................................................
Cable Wrap Circuit, Simplified Schematic Diagram ......................................................................
Polarization Diversity Circuits, Simplified Schematic Diagram ......................................................
Beam Width Control and Indicating Circuits, Simplified Schematic Diagram.................................
Radome-Platform Blower and Control Circuits, Simplified Schematic Diagram.............................
Radome-Platform Pressure Safety Switch and Indicator Circuits, Simplified Schematic Diagram .
Radome-Platform Deicer Circuit, Simplified Schematic Diagram ..................................................
Frequency vs. Feed Position, Typical Chart..................................................................................
Revised January 22, 1968
vi
1-0
1-11
1-13
1-17
1-20
1-23
1-25
1-28
1-29
1-33
1-35
CE-1008
LIST OF ILLUSTRATIONS (Cont)
Figure
No.
2-1
2-2
2-3
2-4
2-5
2-6
2-7
2-8
2-9
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
5-16
5-17
5-18
5-19
5-20
5-21
5-22
5-23
5-24
5-25
5-26
Title
Base Plate Installation, Portable Stand and Hoisting Unit..............................................................
Portable Stand and Hoisting Unit ..................................................................................................
Use of Elevation Hoist ..................................................................................................................
80-Foot Tower Assembly ..............................................................................................................
80-Foot Tower Erection Equipment...............................................................................................
80-Foot Tower Erection ................................................................................................................
80-Foot Tower Disassembly..........................................................................................................
System Interconnection Cabling Diagram .....................................................................................
Antenna System, Stowed Position ................................................................................................
Antenna System, Major Components Location..............................................................................
Antenna System Assembly, Exploded View ..................................................................................
VSWR Test Setup ........................................................................................................................
Polarization Diversity Mechanism, Schematic Diagram ................................................................
Electromechanical Linear Actuator, Wiring Diagram .....................................................................
Antenna Pedestal, Major Components Location............................................................................
Electric Brake Details....................................................................................................................
Schematic, AC Servo Amplifier ....................................................................................................
Schematic, Antenna Pedestal .......................................................................................................
Elevation Drive Assembly, Major Components Location ...............................................................
Schematic, Elevation Drive Assembly ..........................................................................................
Radome Box, Schematic Diagram ................................................................................................
Control Indicator, Antenna Position, Operating Controls and Indicators.........................................
Control Indicator, Antenna Position, Top View, Location of Adjustments and Test Points..............
Control Indicator, Antenna Position, Bottom View, Location of Adjustments and Test Points.........
Schematic, Scan Generator..........................................................................................................
Antenna Position Control Indicator, Gearing Diagram ...................................................................
Schematic, Antenna Position Control Indicator .............................................................................
Power Supply - Antenna Control, Front Panel Controls and Indicators ..........................................
Power Supply, Antenna Control, Location of Adjustments and Test Points....................................
Schematic, Power Supply - Antenna Control.................................................................................
Scope Modifications Block Diagram..............................................................................................
Scope Wiring Modifications ..........................................................................................................
Modulator Schematic Diagram......................................................................................................
Demodulator Schematic Diagram .................................................................................................
Writing Gun Relay Driver Schematic Diagram ..............................................................................
vii
Page
2-2
2-6
2-9
2-13
2-20
2-21
2-40
2-43
2-46
5-2
5-4
5-12
5-13
5-16
5-18
5-20
5-23
5-29
5-31
5-33
5-35
5-39
5-42
5-43
5-45
5-48
5-51
5-54
5-55
5-57
5-59
5-60
5-62
5-63
5-65
CE-1008
LIST OF TABLES
Table
No.
1-1
1-2
1-3
2-1
2-2
4-1
4-2
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
5-10
5-11
5-12
5-13
5-14
5-15
5-16
5-17
Title
Tabulated List of Equipment Supplied...........................................................................................
Special Tools and Test Equipment................................................................................................
Equipment Specifications and Operating Characteristics ..............................................................
80-Foot Tower Erection Equipment...............................................................................................
Cabling Chart................................................................................................................................
Periodic Inspection and Preventive Maintenance Schedule ..........................................................
Trouble Analysis Chart..................................................................................................................
Antenna System, Major Components Parts List ............................................................................
Antenna System, Parts List...........................................................................................................
Antenna Pedestal, Parts List .........................................................................................................
Azimuth Drive Assembly, Parts List ..............................................................................................
Polarization Diversity Mechanism .................................................................................................
Electromechanical Linear Actuator, Parts List ...............................................................................
Elevation Drive Assembly, Parts List ............................................................................................
Portable Stand and Hoist, Parts List..............................................................................................
Elevation Drive Assembly Hoist, Parts List ...................................................................................
80-Foot Tower, Parts List..............................................................................................................
Antenna Position Control Indicator, Location and Function of Test Points and Adjustments ..........
Control Indicator, Antenna Position, Parts List ..............................................................................
Antenna Control Power Supply, Location and Function of Test Points and Adjustments................
Power Supply - Antenna Control, Parts List...................................................................................
Modulator, Parts List.....................................................................................................................
Demodulator, Parts List ................................................................................................................
Writing Gun Relay Driver, Parts List .............................................................................................
viii
Page
1-1
1-6
1-8
2-12
2-47
4-1
4-4
5-68
5-70
5-75
5-81
5-84
5-85
5-86
5-88
5-89
5-91
5-93
5-94
5-103
5-104
5-106
5-108
5-110
CE-1008
Figure 1-1. Antenna System QRC-280(A), Equipment Supplied.
1-0
CE-1008
SECTION I
GENERAL DESCRIPTION
1.
GENERAL
A.
PURPOSE AND SCOPE: OF THE MANUAL -This handbook contains information concerning the Model
QRC-280(A) Antenna System (Figure 1-1), designed and fabricated by the Temec Division of the Systems Group,
Canoga Electronics Corporation, Canoga Park, California. Included herein is information relative to description and
theory of operation of the Antenna System and complete, concise procedures for system operation, maintenance,
installation, and adjustment. The theory and procedures are supplemented by the necessary schematic diagrams,
drawings and illustrations, and parts lists.
B.
PURPOSE OF THE EQUIPMENT - The Antenna System, which consists of a fixed-position communications
antenna with azimuth and elevation rotation capabilities, allows an area in space to be searched for a point or points of
uhf and microwave radiation. Searching may be accomplished by local manual (operator) control, slave, or automatic
sector scanning.
C.
EQUIPMENT SUPPLIED - The equipment supplied and required for operation of the Antenna System is listed
in Table 1-1 and the Antenna System is illustrated in Figure 1-1. A brief description of the Antenna System and the
major components therein is contained in the succeeding paragraphs. Major components comprising the Antenna
System are discussed in detail in Section V.
TABLE 1-1. TABULATED LIST OF EQUIPMENT SUPPLIED.
Nomenclature
Reflector, Parabolic
9 - Foot
Antenna, Log-Periodic
Dipole Feed
Polarization Unit
Actuator
Electromechanical,
Linear
Dimensions (Inches)
Width
Height
(Dia)
Depth
Part
Number
Qty
Weight
(Pounds)
728901
2
---
(108)
---
728967
1
---
---
---
728531-1
728542
2
1
--3.5
--17.5
--3.5
Revised January 22, 1968
1-1
CE-1008
TABLE 1-1. TABULATED LIST OF EQUIPMENT SUPPLIED (CONT).
Nomenclature
Antenna Pedestal
Elevation Drive
Support Casting
Extension, Support
Elevation Drive
Support, Elevation
Drive
Radome-Platform
Tower, Antenna,
80-Foot
Control Indicator,
Antenna Position
Power Supply,
Antenna Control
Lightning Rod
Weight
(Pounds)
Dimensions (Inches)
Width
Height
(Dia)
Depth
Part
Number
Qty
728733-5
728910-1
728599
728574
1
1
2
2
20
32
-----
(36)
28
-----
--18
-----
728619
1
---
---
---
980200
L1686
2
1
--86
--86
728922
1
700
(est)
41
--960
7
19
20.5
728917
1
51
10.5
19
18
10
(est)
10
(est)
300
(est)
25
(est)
10
(est)
300
(est)
80
(est)
12
(est)
---
---
---
---
---
---
---
---
72
32
8
---
---
---
---
---
---
---
---
---
---
---
---
728678-3 1
Lightning Rod
728698
1
Hoisting Unit and
Stand, Portable
Hoist, Elevation
728952
1
728833
1
Wire Rope Assembly
728680
3
Guy, Radome,
80-Foot Tower
Guy, Radome,
Ground Installation
Drive Tool
728753
4
728663-3 4
728685
1
1-2
CE-1008
TABLE 1-1. TABULATED LIST OF EQUIPMENT SUPPLIED (CONT).
Nomenclature
Ground Rod Assembly
Transmitter
DF Display
Oscilloscope
Part
Number
Qty
728701
1
Model 122
1
1
728930
1
Weight
(Pounds)
Dimensions (Inches)
Width
Height
(Dia)
Depth
10
(est)
---
---
---
12
(est)
60
24
(18)
---
8.71
19
23
Total weight 1700 lbs
(1) ANTENNA SYSTEM (See Figure 5-1) - The Antenna System is housed in a 16-foot inflatable radome on a
type I platform. It is designed for installation on an 80-foot tower or a portable hoisting stand. The Antenna System
consists of a 9-foot fiberglass parabolic reflector fed by a log-periodic dipole feed, an elevation drive assembly with
elevation capabilities of from -18 to +98 degrees, an elevation drive support casting, an elevation drive support
extension, an antenna pedestal with rotation capabilities of ± 300 degrees, two level bubbles, an elevation data cable
assembly, and r-f cable assemblies.
a. The antenna has a very narrow beam width and requires both azimuth and elevation rotation capabilities
in order to scan for, locate and receive r-f radiation from a point, or points, in space. The antenna operates over the
frequency range of from 1 to 12 GHz. The antenna is also provided with an electromechanical linear actuator (beam
broadener) with a motor-driven mechanism which provides remotely selectable actuation of the linear movement of the
feed support shaft relative to the focal point of the reflector. The primary effect of defocusing the feed toward the
reflector from the focal point is to increase the phase error across the reflector, broadening the main lobe by several
degrees and reducing the gain of the antenna. The antenna is capable of any one of four modes of remotely selected
linear polarization: horizontal, vertical, left-hand 45 degrees, or right-hand 45 degrees. Polarization and beambroadening is controlled from the remotely-located Antenna Position Control Indicator via cabling to the antenna
pedestal, the elevation data cable assembly, from the antenna pedestal to the elevation drive, and a cable from the
elevation drive to the antenna.
1-3
CE-1008
(2) ANTENNA PEDESTAL (See Figure 5-6) - The antenna pedestal used with the Antenna System consists of a
cylindrical riser base which houses the azimuth servo drive mechanism, azimuth synchro assembly, azimuth, electric
pressure brake, and part of the antenna polarization control unit. The azimuth servo drive mechanism consists of a
servoamplifier, an a-c servo motor, and a gear train connected to a vertical tubular shaft, mounted in a precision bearing
assembly, which has a mounting flange on top for mounting the antenna mast. An angle scale, graduated from 0 to 360
degrees, attached to the vertical tubular shaft, and an index marker attached to the stable part of the riser base provide a
visual indication of the pedestal azimuth rotation, and during installation they allow orientation of the pedestal either to
true north or to a selected reference point. A safety switch on the riser base controls operating power to the servo drive.
The azimuth synchro assembly contains two synchros which provide control and data outputs for the azimuth axis, a
cable-wrap potentiometer, and two electric limit switches. Two mechanical stops in the azimuth drive limit rotation of the
pedestal to ± 300 degrees. The electrical limit switch, which acts as a buffer for the mechanical stops, makes contact
approximately 30 degrees before the mechanical stops. The electric brake, which is released only when power is applied
to the system, prevents movement of the antenna in azimuth when the system is not operating. A detailed description
and theory of operation of the antenna pedestal are contained in Section V of this manual.
(3) ELEVATION DRIVE ASSEMBLY (See Figure 5-10) - The elevation drive assembly, which consists essentially
of a yoke assembly, a housing, and a drive motor, supports the antenna and tilts it in elevation. The yoke assembly, a
non-rotatable assembly with a stationary drive gear, is bolted to an elevation drive support casting which couples the
azimuth drive to the elevation drive. The elevation housing, a U-shaped casting which is bolted to and supports the
antenna, is supported through roller bearings in the yoke assembly. The drive motor, when powered, drives the elevation
housing around the yoke assembly. An angle scale, graduated from 0 to 360 degrees, affixed to the movable housing,
and an index marker affixed to the stable elevation yoke provide a visual indication of the elevation angle of the antenna,
and during installation they allow orientation of the antenna to zero-degree elevation, Two mechanical limit stop
assemblies prevent movement of the elevation housing below -18 degrees and above +98 degrees. An electrical limit
switch, which acts as a buffer for the mechanical stops, makes contact approximately 3 degrees before the mechanical
stops. Two synchros provide control and data outputs for the elevation axis. An electric pressure brake, which is
released only when power is applied to the system, prevents movement of the antenna in elevation when the system is
not operating.
(4)
TYPE I RADOME-PLATFORM -
a.
The type I radome-platform used with the Antenna System consists of an inflatable radome and a
box-type metal construction which serves as the radome base and houses the radome blowers and pressure switches
and the Antenna System. The type I platform measures 6 by 6 by 2.58 feet. The radome, when inflated, has a
maximum diameter of 16 feet.
Revised January 22, 1968
1-4
CE-1008
b.
The radome-platform contains an electric motor-driven blower to inflate the radome, automatic
pressure controls to maintain radome pressure within defined limits, pressure limit switches, and deicers. The pressure
limit switches interrupt servo drive power to the Antenna System when the radome pressure is below the defined safe
limit.
(5) ANTENNA CONTROL POWER SUPPLY (See Figure 5-19) - The Antenna Control Power Supply provided
with the Antenna System is capable of supplying power, servo excitation, and azimuth orient correction factors. In
addition, the unit provides the controls necessary to control power, pressure, and deicing of the radome-platform. A
detailed description of the Antenna Control Power Supply and the controls and indicators thereon is contained in Section
V of this manual, paragraph 14.
(6) ANTENNA POSITION CONTROL INDICATOR (See Figure 5-13) -- The Antenna Position Control Indicator is
provided with the Antenna System. It contains the controls necessary to control the Antenna System simultaneously in
azimuth and elevation and to provide a decimal display of the true azimuth and elevation position of the antenna.
Additional controls allow selection of the mode of system operation - scan, manual, or slave. In the scan mode of
operation, a scan generator in the unit allows the antenna to scan a predetermined sector in azimuth, within a maximum
sector of ± 270 degrees around the true azimuth zero references. In this mode, the antenna elevation angle is controlled
as in the manual mode. In the manual mode, synchros driven by manually operated handwheels on the front panel of
the unit provide the control voltages required to position the antenna in azimuth and elevation. In the slave mode,
control voltages from a radar or remote antenna system supply the azimuth and elevation positioning control voltages
through switches in the unit.
a. Additional controls are provided which allow the polarization of the antenna to be changed and the beam
width of the Antenna System to be increased or decreased. A meter is provided which indicates the beam width by
percentage of increase from the fixed focal point of the reflector. To attain proper beam-broadening, the meter reading
must be set according to the Frequency vs. Feed Position chart provided with the Control Indicator. A typical chart is
shown in Figure 1-11. A cable-wrap meter with an "O" center and two red limit makings affords a visual indication of the
azimuth cable wrap in the antenna pedestal. A detailed description of the Antenna Position Control Indicator and the
controls and indicators thereon is contained in Section V of this manual, paragraph 13.
(7) SCOPE --- The Direction Finding Display Scope is provided with the Antenna System. It is a plotting storage
oscilloscope which produces a visible output on the viewing screen corresponding to the antenna pattern signals. The
scope is used for determining the azimuth direction of a received signal. A detailed description of the scope is contained
in Section V of this manual, paragraph 15, and in Appendix I.
Revised January 22, 1968
1-5
CE-1008
D.
SPECIAL TOOLS AND TEST EQUIPMENT - Table 1-2 lists the special tools and test equipment required to
install, check out, operate, and maintain the Antenna System.
E.
CONDENSED DATA
(1) EQUIPMENT SPECIFICATIONS AND OPERATING CHARACTERISTICS Equipment specifications and
operating characteristics are contained in Table 1-3.
(2) SPECIAL DESIGN FEATURES - The special features of the Antenna System are contained in the
following paragraphs.
a.
Antenna and antenna feeds are designed to provide maximum usable signals that the present state
of the art permits. Small sector scanning, about 10 degrees, followed by manual heading of the antenna provides quick,
precise location of a source of uhf radiation in space.
b.
of heavy rectifiers.
Use of a-c motors and synchros reduces possibility of generating r-f interference and obviates use
TABLE 1-2. SPECIAL TOOLS AND TEST EQUIPMENT.
Qty
Description
Manufacturer
Part
Number
1
1
1
1
1
1
1
2
1
1
1
1
Box, Tool
Hammer, Plastic Head
Pliers
Wrench, Adjustable
Wrench, Open-End, 1-1/8”x 1-1/16”
Screwdriver, Phillips Head, 8”
Screwdriver, Slot
½ ”Drive Extension, 10”
Wrench Set, Allen, 14-Piece
Wrench, Open-End, ¾ ”x 7/8”
Wrench, Open-End, 9/16”x ½ ”
Wrench, Open-End, 5/8”x ¾ ”
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
1-6
CE-1008
TABLE 1-2. SPECIAL TOOLS AND TEST EQUIPMENT (CONT).
Qty
Description
Manufacturer
Part
Number
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
1
1
1
1
1
Wrench, Open-End, 3/8" x 7/16"
Universal Joint, ½ " Drive
1-1/8" Socket, ½ " Drive
¾ " Socket, ½ " Drive
9/16" Socket, ½ " Drive
Hammer, Sledge
Wrench, Allen, 3/8"
Transit (Surveyors, with Azimuth and Elevation
Scales)
Axe, 3-pound (Michigan or Connecticut Pattern)
Shovel, No. 3, Long Handle
Bar, Crow (6-foot approx.)
Bar, Digging and Tamp
Level, Plumb and (carpenter's, 28")
Line, Chalk - Mason's braided, 1000 feet
Bundle (24) Stakes, Locating 1" x 2" x 20" (Pine
(wood) No.1)
Bundle (24) Stakes, Locating 1" x 2" x 40" (Pine
(wood) No.1)
Oscilloscope
Vacuum Tube Voltmeter
Signal Generator 450-1230 mc
Signal Generator 1.8-4.0 kmc
Signal Generator 3.8-7.6 kmc
Signal Generator 7.0-11.0 kmc
Signal Generator 10.0-15.5 kmc
Revised January 22, 1968
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Furnished with System
Tektronix
Hewlett-Packard or equal
Hewlett-Packard or equal
Hewlett-Packard or equal
Hewlett-Packard or equal
Hewlett-Packard or equal
Hewlett-Packard or equal
1-7
535
HP-410
HP-612A
HP-616A
HP-618B
HP-620A
HP-626A
CE-1008
TABLE 1-2. SPECIAL TOOLS AND TEST EQUIPMENT (CONT).
Qty
Description
Manufacturer
Part
Number
1
VSWR Meter
Hewlett-Packard or equal
HP-415B
1
Coax Slotted Line
Hewlett-Packard or equal
HP-806B
1
Probe Carriage
Hewlett-Packard or equal
HP-809B
1
Slotted Line
Hewlett-Packard or equal
HP-805A
1
Standing Wave Detector
Polytechnic
Research
Development
and
PRD219
1
Calibrated Susceptance
Polytechnic
Research
Development
and
3302-L
1
Detector Mount
Hewlett-Packard or equal
HP-440A
1
Broadband Probe
Hewlett-Packard or equal
HP-442B
TABLE 1-3. EQUIPMENT SPECIFICATIONS AND OPERATING CHARACTERISTICS.
POWER REQUIREMENTS
Source:
Voltage:
Phase:
Frequency:
Maximum Current:
Commercial or Diesel Generator
120/208 ±10%
3-Phase, 4-Wire, Wye Connected
48 to 62 cps
80 AMP per Phase at 115V
Current Required by Major Components
Antenna System Power
Servo Excitation
Radome Power
Utilities
20 AMP MAX per phase (3 phase)
10 AMP MAX (single phase)
40 AMP MAX per phase (3 phase)
20 AMP MAX (single phase)
Revised January 22, 1968
1-8
CE-1008
TABLE 1-3. EQUIPMENT SPECIFICATIONS AND OPERATING CHARACTERISTICS (CONT)
Wattage Ratings of Major Components
Service Outlets in Radome Shelter
Azimuth Drive Motor
Elevation Drive Motor
Polarization Unit Motor
Linear Actuator Motor
100W Output
25W Output
15W (Estimated)
15W (Estimated)
Wattage - Heat Dissipation of Major Components
Power Supply - Antenna Control
Control Indicator - Antenna Position
260W (Estimated)
200W (Estimated)
ANTENNA CHARACTERISTICS
Antenna
Operating Frequency Range
Polarization
VSWR
1 to 12 GHz
HORIZ, VERT, RH 45°, LH 45°
3:1
PEDESTAL AND SERVO SYSTEM
CHARACTERISTICS
Servo
Type I
Azimuth Travel
± 270°to Electrical Stops
± 300°to Mechanical Stops
Elevation Travel
-15°to +95°to Electrical Stops
-18°to +98°to Mechanical Stops
Angular Rate
21°per second
Angular Acceleration
13°to 15°per second per second
Angular Accuracy
±½ °RMS either axis
Data Output
Azimuth and Elevation, 1-Speed Synchro
1-9
CE-1008
c.
Use of one cable-wrap meter for indicating cable wrap on the antenna reduces cable conductor
requirements, permits mounting the meter on the same panel with the antenna indicators, and simplifies operator
functions.
NOTE
Reference phase current for all synchros must be supplied from a common phase source.
2.
SYSTEM THEORY OF OPERATION
A.
GENERAL (See Figure 1-2) - The Antenna System is installed in an inflatable radome and has azimuth and
elevation rotation capabilities. The Antenna System and associated control units allow an area in space to be searched
for a point or points of UHF or microwave radiation throughout the frequency range of from 1 to 12 GHz.
(1) Operation of the Antenna System is possible in three modes - manual, slave or scan. In either of the
three modes, positioning of the antenna is controlled by two identical channels, an azimuth channel and an elevation
channel, each of which is capable of receiving control voltages from a local or remote source and converting these
voltages into azimuth and elevation positioning data. In addition, the azimuth channel may be controlled by voltages
originating in a scan generator in the Control Indicator. In the manual mode of operation, the antenna is positioned by a
60-cps control voltage generated by handwheel-driven synchros. In the slave mode of operation, the antenna and
counters on the Control Indicator are positioned by a 60-cps control voltage from a remote source. In the scan mode of
operation, the antenna scans a predetermined sector in azimuth in response to control voltages generated by the scan
generator. In this mode, the elevation positioning circuit functions as in the manual mode.
(2) Synchro outputs, which are proportional to the azimuth and elevation angles of the antenna, with respect
to zero-degree azimuth and elevation reference points, are provided by the Antenna System.
(3) The direction of true heading is relative to a furnished reference line and earth stable coordinates. The
azimuth orient controls on the Antenna Position Power Supply allow a compensation factor to be set into the system for
misorientation of a system to the established references.
(4) Figure 1-2 is an overall block diagram of the QRC-280(A) Antenna System which indicates the major
functional components of the Antenna System and the relationship of these components to the control units. The
Antenna Control Power Supply provides operating power, servo excitation, and azimuth
Revised January 22, 1968
1-10
CE-1008
Figure 1-2. Antenna System, PS-135-1, Overall Block Diagram.
1-11
CE-1008
orient control for the Antenna Position Control Indicator.
operating configuration.
The configuration illustrated in Figure 1-2 is the normal
(5) The major functional circuits in the Antenna System are discussed in the succeeding paragraphs. These
circuits are the antenna drive and positioning circuits, the cable-wrap circuit, the polarization selection circuits, the beambroadener circuit, the radome blower, deicer, and safety circuits.
B.
ANTENNA POSITIONING AND DRIVE CIRCUITS (See Figure 1-3) - The simplified schematic diagram of
Figure 1-3 illustrates the antenna drive and positioning circuits for the Antenna Position Control Indicator with both
azimuth and elevation positioning capability, and the power and azimuth orient circuits on the associated Antenna
Control Power Supply.
(1) ANTENNA SYSTEM DRIVE CIRCUITS - Drive power is interlocked with a SAFE-RUN switch S1 on the
antenna pedestal, the SERVO DRIVE switch S1 on the Control Indicator, and a SAFE PRESSURE switch in the radome.
When the switches are in the positions indicated on Figure 1-3 (i. e., the SAFERUN switch in the RUN position and the
SERVO DRIVE switch in the ON position), 28-volt DC is applied through the closed circuit to energize relays K2 and K3
in the Power Supply. With K2 and K3 energized, 115-volts AC is applied through the mated contacts of the relays to
energize the azimuth and elevation servo amplifiers in the antenna pedestal.
(2) MANUAL MODE OF OPERATION
NOTE
Since the azimuth and elevation channels function the same in the manual mode of operation,
only the azimuth channel is discussed herein.
In the manual mode of operation, the azimuth positioning voltage is generated by rotation of the azimuth handwheel,
located on the front panel of the Control Indicator. Mode selection is accomplished by placing the MODE SELECT switch
S2 to the MANUAL position. This allows 28-volts DC to be applied to the azimuth handwheel clutch, L1, energizing the
clutch and connecting the azimuth handwheel to the manual/scan control transmitter synchro, B3, in the Control
Indicator. The stator leads of B3 are connected through other contacts of MODE SELECT switch S2 to the azimuth
orient differential control transmitter synchros B1 and B2 in the Power Supply. The differential control transmitters allow
a preset factor, which compensates for misorientation of the antenna pedestal to true north or a selected reference point,
to be added to the error voltage generated by the manual/scan control transmitter synchro in the Control Indicator. The
stator leads of the differential control transmitters are
1-12
CE-1008
Figure 1-3. Antenna Positioning and Drive Circuits, Simplified Schematic Diagram.
1-13/1-14
CE-1008
connected to the stator leads of control transformer synchro B1, one in each of the antenna pedestals, which are geared
in a 1:1 ratio with the respective azimuth drive assembly. The output of the control transformer is an error voltage, the
amplitude of which is proportional to the rotational displacement and the phase of which is a function of the direction of
displacement between the shafts of the differential controlled transmitter in the Power Supply and the control transformer
in the antenna pedestal. This error voltage is applied to a solid-state servoamplifier in the antenna pedestal. The output
of the servoamplifier is an AC voltage which drives servo motor MG1 to reposition the antenna through a gear train,
which is also coupled to the rotor of control transformer synchro B1 and remote data torque transmitter synchro B2.
Thus, the antenna, and subsequently control transformer B1, is driven in a direction which reduces the error voltage from
the control transformer to zero. The limit switch on the output of the azimuth servoamplifier limits the azimuth rotation
capabilities of the antenna to ±270 degrees. When a limit is engaged, the limit switch opens, causing the current from
the servoamplifier to flow through the large load resistor, reducing the amount of drive voltage to MG1. This switch
opens 30 degrees before the mechanical stops are engaged and acts as a buffer for the mechanical stops. In elevation,
the limit switch functions the same, limiting the elevation capability of the antenna from -15 to +95 degrees, and engages
3 degrees before the mechanical stops.
(3) SLAVE MODE OF OPERATION
NOTE
Since the azimuth and elevation channels function the same in the slave mode of operation, only
the azimuth channel is discussed herein.
In the slave mode of operation, a 60-cps slave input voltage from a control transmitter synchro in a remote antenna or
radar system is applied to the stator leads of the slave control transformer synchro B1 in the Control Indicator and,
through contacts of MODE SELECT switch S2, which in this mode is in the SLAVE position, to the azimuth orient
differential control transmitter synchros in the power supply. The function of the system from the differential control
transmitter synchros through repositioning of the antenna is the same in the slave mode of operation as in the manual
mode of operation; however, the slave input from the remote system which is applied to slave control transformer B1 in
the Control Indicator is used to drive the true azimuth counter to indicate the position of the antenna pedestal. This is
accomplished as follows: The output of slave control transformer B1 in the Control Indicator is an error voltage, the
amplitude of which is proportional to the rotational displacement and the phase of which is a function of the direction of
displacement between the shaft of the remote master control transmitter synchro in the radar or antenna system and the
shaft of control transformer synchro B1 in the Control Indicator.
1-15
CE-1008
This output is applied to a servoamplifier AR2 in the Control Indicator which is identical to the servoamplifier in the
antenna pedestal. The output of the servoamplifier drives motor MG1 in the Control Indicator, which is coupled through
a gear train to the true azimuth counter and to slave control transformer B1. Thus, the slave control transformer B1 is
driven to null the error output on its stator leads and the true azimuth counter is driven to indicate the azimuth position of
the antenna. Servoamplifier AR2 receives 115-volts AC from relay K3 in the Power Supply, which is energized by 28volts DC through contacts of the MODE SELECT switch on the Control Indicator.
(4) SCAN MODE OF OPERATION - In the scan mode of operation, the antenna is automatically
repositioned in azimuth by a positioning voltage from a scan generator in the Control Indicator. This mode of operation
allows any preset sector in azimuth within a maximum sector of ±270 degrees, with reference to the system's zero
reference point, to be automatically scanned. In this mode, the elevation channel is controlled by the manually operated
handwheel on the front panel of the Control Indicator in the same manner as the manual mode of operation.
a.
The scan generator circuitry (see Figure 1-4) consists of the scan generator circuit card, the SCAN
CONTROL SECTOR potentiometer, R2, and the SCAN CONTROL GAIN potentiometer, R3, on the front panel of the
Control Indicator and the antenna position potentiometer, R4, which is coupled through a magnetic clutch to the gear
train driven by the azimuth drive motor. Potentiometer R2 controls the width of the sector to be scanned. Potentiometer
R3 controls the gain of the error output and, subsequently, the rate at which the sector is scanned. Potentiometer R4 is a
continuous rotation potentiometer which is spring loaded to its center position. This potentiometer is connected through a
magnetic clutch, L3, when the clutch is energized, to the azimuth gear train in the Control Indicator driven by the drive
motor MG1 and follows the gear train from its position when the clutch was energized. When the scan clutch is
deenergized, potentiometer R4 returns to its center position through the spring loading action. The output of R4 is,
therefore, an analog voltage which is proportional to the azimuth angle of the antenna, relative to the position of the
antenna prior to scan clutch engagement. Operation of this circuit is as follows:
b.
With the MODE SELECT switch, S2, in the SCAN position, 28-volts DC is applied through scan
limit switch S8 to energize scan clutch, L3, connecting potentiometer R4 to the azimuth gear train. The output of R4 is
an analog voltage which is proportional to the antenna position around the angle to be scanned. A 2: 1 voltage divider,
formed by R6, R9, R11 and R12, is connected between the arm of the potentiometer R4 and SCAN CONTROL SECTOR
width potentiometer R2. Differential amplifier Al senses the voltage difference between the voltage divider and the arm
of potentiometer R2. The outputs of Al are applied to two emitter-follower amplifiers, A2 and A3, which act as a buffer to
prevent differential amplifier A4 from loading Al. The outputs of A4
Revised January 22, 1968
1-16
CE-1008
Figure 1-4. Scan Generator, Simplified Block Diagram.
1-17/1-18
CE-1008
are used to set or reset a flip-flop, depending upon the direction of antenna rotation. When the output is from the ONE
side of the flip-flop, one side of a 6. 3-volt transformer winding is connected to ground. When the output is from the
ZERO side of the flip-flop, the other winding of the 6. 3-volt transformer is connected to ground. Thus, the voltage at the
center tap of the 6. 3-volt transformer will reverse phase when the flip-flop is alternately switched on and off. The
voltage from the 6. 3-volt transformer's center tap is AC-coupled by a capacitor C1 to SCAN CONTROL GAIN
potentiometer R3. The movable arm of R3 determines the amount of error voltage which is applied to the servoamplifier
and, subsequently, the rate at which the antenna scans the predetermined sector. The servoamplifier drives azimuth
drive motor MG1 which, in turn, through a gear train, drives the manual/scan control transmitter synchro B3, repositioning
the rotor of B3 so that a voltage appears on the stator leads. The system functioning from this point through
repositioning of the antenna is essentially the same as in the manual mode of operation. Drive motor MG1 also drives
potentiometer R4, through the gear train, in an increasing or decreasing direction depending upon the direction of
antenna rotation. When R4 is positioned such that it corresponds to the maximum sector to be scanned, either clockwise
or counterclockwise, the flip-flop in the scan generator is either set or reset, depending upon its previous condition, and
drives the antenna in the opposite direction. When SCAN CONTROL SECTOR width potentiometer R2 is rotated fully
counterclockwise, only a few degrees of movement of potentiometer R4 is required to set or reset the flip-flop. When the
potentiometer R2 is rotated clockwise, it requires proportionally larger angles of rotation of the potentiometer R4 to set or
reset the flip-flop. Therefore, with potentiometer R2 rotated full counterclockwise, the angle scanned will be small; that
is, approximately 10 degrees. With potentiometer R2 rotated full clockwise, the width of the angle scanned increases to
the full ±270 degrees. The function of scan limit switch S8 is to deenergize the clutch when the scanned angle exceeds
±270 degrees to avoid damaging the center positioning spring of potentiometer R4.
C.
CABLE-WRAP CIRCUITS (See Figure 1-5) - The cable-wrap circuit consists of: potentiometer A3R1 in the
antenna pedestal which is ganged to the azimuth limit switch and geared to the azimuth drive assembly, meter M1, and
resistors R8, R15, R7, R14 and R16 in the Control Indicator. The function of this circuit is to indicate the limits of the
azimuth cable wrap in either a CW or CCW direction. The cable-wrap meter M1 is essentially a 0- to 50-millimeter with a
zero center-scale marking and red markings which indicate the limits of the cable wrap in either a CW or CCW direction
at either end. With the antenna positioned at 0 degree, the movable arm of A3R1 is positioned so that the current
through M1 is such that the meter is balanced (at zero center scale). As the antenna travels in a CW direction, the
current through meter M1 increases, causing the deflection of the meter to increase. As the antenna travels in a CCW
direction, the current through meter M1 decreases, causing the deflection of the meter to decrease. CABLE WRAP
indicator M1 will indicate the position of the antenna. The cable-wrap meter is adjusted by potentiometers R8 and R7 so
1-19
CE-1008
005
736353
Figure 1-5. Cable Wrap Circuit, Simplified Schematic Diagram.
1-20
CE-1008
that the needle of the cable-wrap meter M1 goes into the red area of the scale whenever an electrical limit of ±270 is
reached.
D.
POLARIZATION DIVERSITY CONTROL CIRCUITS (See Figure 1-6)
(1) The Antenna System is capable of any one of four modes of linear polarization: left-hand, right-hand,
left-hand 45 degrees, or right-hand 45 degrees. The mode is selected by operation of POLARIZATION SELECT switch
S6. Refer to Figure 1-6. When the desired mode is reached, all lights except the one for the selected mode will go out.
a.
The antenna polarization is selected by a motor-driven Polarization Diversity Mechanism which is
mounted by struts on the reflector and supports the antenna feed. This mechanism is controlled by a detent relay in the
antenna pedestal which is, in turn, controlled in the aforementioned manner by the controls on the Control Indicator. The
motor-driven Polarization Diversity Mechanism shaft, which supports the antenna, has four positions and will drive
through 135 degrees of actual rotation. It has stops in positions that are one fourth of this total rotation. There is a dual
function of movement which indicates a coarse position of the polarizer, and an indexing movement which operates at
four times the polarizer speed and determines a precise motor stop position. When the polarizer motor reaches the limit
of travel, a switch controlled by the Geneva mechanism causes a reversing relay to be actuated or deenergized,
depending on the direction of rotation. The antenna polarization control then causes the motor to drive in the opposite
direction. For example, if the antenna is directed in a horizontal position and the operator desires to drive it to vertical
position, the motor will then be driving out of one stop into another stop position. If it is desired to turn it in the reverse
direction (for example, to the right-hand circular), the motor drive will drive forward to the limit stop, reverse its direction
of rotation, and then return to the newly selected position, which is between vertical and horizontal polarization. Due to
the time interval between the fine and the coarse indexing switches on the motor-driven polarizer, it is necessary that the
detent relay be operated which, in turn, prevents the reversing relays and the Control Indicator from operating until the
motor itself has come to a complete index stop in either direction of rotation. This sequence assures that the polarizer
will stop only in the correct polarizing position.
E.
ELECTROMECHANICAL LINEAR ACTUATOR (BEAM BROADENER) AND INDICATOR CIRCUITS (See
Figure 1-7) - The Antenna System is provided with an electromechanical linear actuator (beam broadener) which consists
of a motor-driven mechanism to provide remotely selectable actuation of the linear movement of the antenna feed
support shaft relative to the focal point of the reflector. The primary effect of defocusing the antenna feed toward the
reflector from the focal point is to increase the phase error across the reflector, broadening the main lobe by several
degrees and reducing the gain of the antenna.
1-21
CE-1008
Figure 1-6. Polarization Diversity Circuits, Simplified Schematic Diagram.
1-23/1-24
CE-1008
Figure 1-7. Beam Width Control and Indicating Circuits, Simplified Schematic Diagram.
1-25/1-26
CE-1008
Operation of this defocusing process is controlled by the BEAM INCREASE-BEAM DECREASE switch, S7, on the
Control Indicator. Switch S7 is a DPDT switch which applies 28-volts DC to one of the fields of a reversible actuator
motor in the electromechanical linear actuator on the antenna. This drives a shaft on the actuator which extends or
retracts, depending upon the positioning of S7, the feed on the antenna. Reversing the position of switch S7 reverses
the direction of shaft movement.
(1) BEAM WIDTH meter M2 on the Control Indicator, which is essentially a 0- to 50-millimeter graduated
from 0 to 100, indicates the position of the antenna feed as a percentage of increase relative to the focal point of the
antenna. The position of the pointer on the meter is controlled by a position-indicating potentiometer on the
electromechanical linear actuator which is mechanically ganged to the actuator drive motor and adjusting resistors R4
and R6 on the Control Indicator. The normal focal point of the antenna is obtained when the actuator is completely
retracted; in this position, the indicating potentiometer is at its further clockwise point and the beam width meter on the
Control Indicator indicates zero. As the beam width is defocused, the position-indicating potentiometer rotates in a
counterclockwise direction, increasing the current flow through the beam width meter and thus the position of the pointer.
Maximum defocusing is obtained when the beam width meter is at 100.
F.
RADOME-PLATFORM CIRCUITS
(1) BLOWER AND CONTROL CIRCUITS (See Figure 1-8) - The radome-platform blower and control
circuits consist of the RADOME POWER circuit breaker, CB1, and the BLOWER switch, S2, on the Antenna Control
Power Supply and blower B1, relay K1 and pressure switch S1 in the radome-platform. When the RADOME POWER
circuit breaker is operated to the ON position, three-phase AC power is made available to the open contacts of relay K1.
When the BLOWER switch is placed to the ON position, relay K1 is energized, allowing the blower to operate.
(2) PRESSURE SAFETY SWITCHES AND INDICATOR CIRCUITS (See Figure 1-9) - The radome-platform
pressure safety switch circuits consist of pressure switch S1 in the junction box in the radome-platform, which is in series
with the SAFE-RUN switch on the antenna pedestal. This provides two interlocks for the azimuth drive circuit and if
either one is inoperative, the antenna will not drive in azimuth or elevation. The pressure switch closes when radome
pressure falls below 6 inches of water (approximately 0.22 PSI). Indicator light DS2 on the junction box in the radomeplatform indicates when the pressure switch is closed if antenna system power is available in the pedestal. Another
indicator light, DS1, also on the junction box, indicates when the pressure switch is open or when any one of the SAFERUN switches is in the SAFE position. When pressure switch S1 is operated, +28-volts DC is applied to the PRESSURE
SAFE indicator light on the Antenna Control Power Supply.
Revised January 22, 1968
1-27
CE-1008
Figure 1-8. Radome-Platform Blower and Control Circuits, Simplified Schematic Diagram.
1-28
CE-1008
12648
009
736357
Figure 1-9. Randome-Platform Pressure Safety Switch
and Indicator Circuits, Simplified Schematic Diagram.
1-29/1-30
CE- 1008
Illumination of this light indicates that the radome is inflated to a safe pressure. A pressure transducer, MT1, in the
radome-platform, which is essentially a variable potentiometer, has its wiper connected through resistors R3 and R4 to a
pressure gauge on the Antenna Control Power Supply. The function of this circuit is to indicate the radome pressure in
pounds per square inch. The pressure transducer varies its resistance with radome pressure. The pressure gauge is
essentially a 0- to 100-microampere, graduated from 0 to 1, representing pounds per square inch from 0 to 1. With zero
radome pressure, the movable arm of the pressure transducer is positioned so that there is no current flow through the
meter and the needle on the meter is at 0. As radome pressure increases, the current through the meter increases,
causing the deflection of the needle on the meter to increase. The pressure gauge is adjusted by potentiometers R3 and
R6 so that when radome pressure is zero, the needle is at 0 and when radome pressure is 1 PSI, the needle is at 1.
(3) DEICER CIRCUITS (See Figure 1-10) - The radome-platform deicer circuits consist of RADOME POWER
circuit breaker CB1 and the DEICER switch on the Antenna Control Power Supply. When the radome circuit breaker is in
the ON position, three-phase AC power is made available to contacts of relay K3 in the radome-platform. The deicer
switch on the Power Supply controls operation of relay K3. This switch is in series with pressure switch S4 and
temperature switch S5 in the radome-platform. Should radome pressure fall below 9 inches of water (approximately 0.
35 PSI) or the temperature in the radome increase to 38 degrees Fahrenheit, the switches will open, automatically
shutting off the deicers. Assuming sufficient operating pressure at a temperature below 38 degrees Fahrenheit with the
deicer control switch on the Power Supply in the ON position, phase A from the primary power source energizes relay K3,
supplying one phase of the primary power source to a bank of three heat lamps.
(4) UTILITY CIRCUITS - The utility circuits in the radome-platform consist of two convenience outlets and a
power switch on panel Al and two work lights. Primary operating power for the utility circuits is obtained through the
UTILITIES circuit breaker, CB2, on the Antenna Control Power Supply.
(5) INTERCOM CIRCUIT - The radome-platform intercom circuit consists of head and chest set jack, J14, on
the junction box in the radome platform. This jack is connected through the antenna pedestal to a PHONE jack J6 on the
Power Supply.
1-31
CE-1008
Figure 1-10. Randome-Platform Deicer Circuit,
Simplified Schematic diagram
1-33/1-34
CE-1008
Figure 1-11. Frequency vs. Feed Position (Typical Chart)
1-35
CE- 1008
SECTION II
INSTALLATION
1. GENERAL
This section contains the procedures necessary to assemble the Antenna System into an operating configuration and to
install the system at an operating site. Prior to installing the system at an operating site, the siting requirements should
be reviewed, an appropriate site chosen, and the details of system layout planned.
2. INSTALLATION TOOLS AND EQUIPMENT
The tools and equipment required for installation of the Antenna System are listed in Table 1-3.
3. INSTALLATION CONSIDERATIONS AND GENERAL PROCEDURES
A. GENERAL - Installation of the QRC-280(A) Antenna System requires handling, positioning, and aligning and
interconnecting the major components of the Antenna System listed in Table 1-1.
NOTE
Do not remove the radome at any time unless absolutely necessary for maintenance or repair.
B. LOCATION OF THE ANTENNA SYSTEM - Location of the Antenna System is determined by the terrain at the
individual site, the chosen arrangement of the Antenna System, and a restricting cable length of 125 feet. The method of
installation of the Antenna System is as follows:
(1) On Top of an 80-Foot Tower
(2) On a Portable Stand and Hoist Unit
C. SITE PREPARATION AND EQUIPMENT UNLOADING - The first prerequisite for unloading the Antenna
System is a flat, relatively level area for parking the loaded cargo trailers, with a level area, or area that can be leveled,
around them. A 20-foot square area, or 12 small pad areas, should be leveled to accommodate the baseplates and
outrigger support tie rod baseplates of the portable stand and hoist assemblies. Figure 2-1 illustrates the layout and the
2-1
Revised January 22, 1968
CE- 1008
New Figure 2-1. Base Plate Installation, Portable Stand and Hoisting Unit
2-2
Revised January 22, 1968
C E- 1008
relative baseplate dimensions. The baseplate areas must be leveled to within one inch relative to each other.
NOTE
Leveling screws are located on each corner of the portable stand which provide approximately
one inch of adjustment for each corner of the Radome-Platform mounted thereon. The purpose
of these adjustments can be defeated if the Portable Stand baseplate areas are not leveled to
within one inch relative to each other prior to assembling the stand.
(1) EQUIPMENT UNLOADING AND PLACEMENT -When the site has been properly staked out and the area
leveled for the portable stand and hoisting unit, unload the equipment in accordance with the following procedures.
a. Unload the 80-foot towers and associated equipment.
b. Unload the portable stand and hoisting unit near the point where it will first be used.
c. If the Antenna System is to be installed on the 80-foot tower, park the trailer containing the system
near the base of the tower, leaving room to assemble and operate the portable hoisting unit between the trailer and the
tower. Position the trailer, relative to the four corners of the tower, so that the Antenna System is approximately oriented
to true north or the selected zero reference point.
1. If the Antenna System is to be installed on the portable stand and hoisting unit, park the trailer at
the installation site. Position the trailer so that the Antenna System is approximately oriented to true north or the selected
zero reference point.
4. ANTENNA SYSTEM SITE INSTALLATION PROCEDURES (See Figure 5-1)
A. GENERAL - When the Antenna System is shipped from the factory, the antenna pedestal, elevation drive
support casting, elevation drive assembly, and the center section of the reflector are installed in the radome-platform.
The reflector is stowed in the zenith position and the radome deflated and tucked into the platform. A portable transit
cover is installed over the Antenna System while the system is in transit or storage. If, upon receipt of the Antenna
System, it is not so assembled, the antenna pedestal, elevation drive support casting, elevation drive assembly, reflector
center section, and radome should be installed in accordance with Figure 5-2.
2-3
CE- 1008
NOTE
When the mounting location for the Antenna System is established, but before the Antenna
System is installed, locate the boresight target and survey the boresight azimuth as described in
Paragraph 9 of this section.
B. REMOVAL OF TRANSIT COVER - Prior to unloading the Antenna System from the trailer, the transit cover
should be removed in accordance with the following procedures. To perform this procedure, the trailer should be
approximately level.
(1) Unsnap top of transit cover and remove.
(2) Unsnap transit cover sides from radome-platform and remove.
(3) Install eye bolts in corners of radome-platform.
CAUTION
Care should be exercised when removing the transit cover from the Antenna System to avoid
snagging, chafing, or otherwise damaging the radome.
C. 80-FOOT TOWER INSTALLATION - Install the tower as described in paragraph 7 of this section, then proceed
as follows:
(1) Park the trailer containing the Antenna System near the base of the tower, leaving room to assemble and
operate the portable hoisting unit between the trailer and the tower. Position the trailer relative to the four corners of the
selected zero reference point.
(2) Assemble the portable stand and hoisting unit around the Antenna System and lift the system off the trailer
in accordance with the procedures set forth in paragraph 4D of this section.
(3) Lower the Antenna System to the ground.
(4) Using rollers, if available, slide the Antenna System under the 80-foot tower to facilitate fastening the 80foot tower hoist cables to the corner eye bolts on the radome-platform.
(5) Interconnect the Antenna System to the control units as shown in Figure 2-8.
(6) Hoist the Antenna System to the top of the 80-foot tower in accordance with the procedures set forth in
paragraph 7 of this section.
2-4
Revised January 22, 1968
CE- 1008
(7) Drive the ground rod assembly into the ground with a sledge hammer about 3-1/2 feet from a tower leg
until ground wire clamp is just above the ground.
(8)
Fasten the ground fitting to the tower leg.
(9)
Attach the armored ground wire to the fitting on the tower leg and to the ground rod.
NOTE
When attaching (armored) bare ground wire to a ground rod, remove sufficient armor to double
the end of the wire through the ground clamp. Insert the doubled end of the wire through the
clamp against the ground rod on the side opposite the clamp set screw. Tighten the ground
clamp firmly. After the clamp and wire have set a half hour or more, retighten the set screw.
(10) Assemble the Antenna System inside the radome in accordance with the procedures set forth in paragraph
4E of this section.
(11) Level the antenna pedestal in accordance with the procedures set forth in paragraph 6 of this section.
D.
PORTABLE STAND AND HOISTING UNIT INSTALLATION (See Figure 2-2) - The portable hoisting unit
should be assembled while the system is still on the trailer. Pad areas should be leveled for the hoisting unit support and
outrigger support tie rod baseplates prior to assembly. Then proceed as follows:
(1) Position each winch support leg in a hoisting unit support baseplate and place one assembly at each
corner of the type I radome-platform.
(2) Insert the cable assembly on each winch in the hole on the radome platform and adjust the winches until
the cable is taut.
(3)
Assemble the eight white end tensioning tie rods to the winch support legs.
(4)
Assemble the two red end tensioning tie rods to the winch support legs.
(5)
Assemble the eight outrigger support tie rods to the winch support legs.
2-5
CE-1008
Figure 2-2. Portable Stand and Hoisting Unit
2-6
CE- 1008
(6)
Assemble the yellow end tensioning tie rods to the two outrigger support tie rods at each corner of the
(7)
Assemble one blue/white end tensioning tie rod between the winch support leg and each outrigger support
(8)
Adjust each of the tensioning and outrigger support tie rods until the structure is rigid and level.
structure.
tie rod.
(9) With one man stationed at each of the winches, operate the winches to lift the Antenna System out of the
trailer to a height approximately five feet from the ground.
(10) Remove one of the white end tensioning tie rods and pull the trailer out from under the Antenna System.
Replace the tensioning tie rod.
(11)
Lower the Antenna System onto the box supports.
(12)
Fasten the radome-platform to the box supports with the special screws.
(13)
Free that part of the radome that is tucked in the platform.
(14)
Place the radome web strapping over the radome and attach the guy cables (Figure 5-1) to the strapping.
(15)
Interconnect the Antenna System to the control units as shown in Figure 2-7.
(16)
Inflate and guy the radome in accordance with the procedures contained in Section III, paragraph 2, of this
manual.
(17) Assemble the Antenna System inside the radome in accordance with the procedures set forth in paragraph
4E of this section.
(18)
Level the pedestal in accordance with the procedures set forth in paragraph 6 of this section.
E. ASSEMBLING THE SYSTEM INSIDE THE RADOME (Figure 5-2)
(1) When the radome has inflated to a safe pressure, enter the radome.
(2)
Place the SAFE-RUN switch on the antenna pedestal to the SAFE position.
(3) Move the four outer reflector sections from their stored position on the floor of the platform. Carefully
place the section against the side of the radome so that no rough edges are against the radome.
2-7
CE- 1008
(4)
Remove the counterweights from the elevation drive assembly and place them out of the assembly area.
(5)
Remove the reflector center section from the elevation drive assembly and place it out of the assembly
(6)
Install the elevation hoist to the elevation drive support coating in accordance with Figure 2-3, step 2.
(7)
Remove the socket-head cap screws holding the elevation drive assembly in place.
area.
(8) Raise the elevation drive assembly as illustrated in step 3, Figure 2-3, and install the elevation drive
support extension between the drive assembly and the support casting, aligning the red marks as indicated.
(9)
Remove the elevation hoist and reinstall the counterweights and center section of the reflector.
(10) Assemble the four outer reflector sections to the center section. Orient the sections by mating the
numbers on the sections with corresponding numbers on the center section. The sections are fastened to the center
section by tee-handle, quick-release pins on the inside flanged edges of the outer sections. The outer sections are
fastened together by quarter-turn clasp hook fasteners around the outer rim.
(11) Attach the three feed support assemblies to the polarization unit. Orient the polarization unit so that the
numbers on the unit correspond to the same numbered feed support. Secure the unit in position with the hardware called
out on Figure 5-2.
(12) Prior to installing the log-periodic dipole feed, install the electromechanical linear actuator by mating the
guide pin on the polarization unit with the corresponding hole on the actuator and securing in place with the hardware
called for in Figure 5-2. Install the feed and cabling in accordance with the procedures contained in steps (14) through
(16), mating the guide pin on the actuator with the corresponding hole in the polarization unit.
(13) Mate the guide pin on the polarization unit with the corresponding hole on the log-periodic dipole feed.
Secure the feed to the polarization unit with the hardware called out on Figure 5-2.
(14) Install the completed assembly to the reflector in accordance with Figure 5-2, orienting the assembly so
that the numbers on the support correspond with the numbers on the back of the reflector.
2-8
CE- 1008
Figure 2-3. Use of Elevation Hoist
2-9
CE- 1008
(15) Install the elevation data cable from receptacle connector J2 on the antenna pedestal to the connector on
the elevation drive assembly. Wrap the cable around the elevation drive support casting and extension as illustrated in
Figure 5-2. Secure the cable to the support casting with a cable clamp and associated hardware.
(16) Install the cable from the elevation drive assembly to the polarization unit. Secure the cable to the feed
support assembly with the furnished spiral wrap.
(17) Install the rf cables to the log-periodic dipole feed. Secure the cable to feed support assembly with the
furnished spiral wrap.
5. CONTROL UNIT INSTALLATION PROCEDURES
A.
ANTENNA CONTROL POWER SUPPLY - The Antenna Control Power Supply is a 10-1/2-inch high,
standard 19-inch wide, panel-mounted unit. The chassis extends 19 inches behind the panels and is slide mounted. The
slides extend 22-5/16 inches behind the panel so that overall depth of the assembly is 24 inches. The Antenna Control
Power Supply weighs about 65 pounds.
B. ANTENNA POSITION CONTROL INDICATOR - The Antenna Position Control Indicator is a seven-inch high,
standard 19-inch wide, panel-mounted unit. The chassis extends about 22 inches behind the panels and is slide
mounted. The control indicator slides extend 22-5/16 inches behind the panel so the overall depth is 24 inches. The
Antenna Position Control Indicator weighs about 40 pounds.
C. SCOPE - (Data to be supplied later) D. INSTALLATION - Installation of the units consists of engaging the slides,
in the proper position, with the chassis tracks in the furnished racks and sliding them into place. The panel and chassis
assemblies are held in place with standard type, number 10-32 thread, knurled and slotted head captive screws.
Interconnect the units to the systems as shown in Figure 2-7.
6. ANTENNA PEDESTAL LEVELING PROCEDURES
A. When the antenna pedestal is completely installed, level the pedestal in accordance with the following
procedures:
NOTE
Unless otherwise specified, the figure references contained in the following steps are in
reference to Figure 5-7.
2-10
CE- 1008
(1) Loosen the pedestal-to-riser base mounting bolts (four required).
(2) Observe the position of the bubble in one of the level bubbles located on top of the antenna mast mounting
flange on the elevation drive support assembly.
(3)
Rotate the antenna mast mounting plate 180 degrees in azimuth and again observe the position of the
(4)
Adjust one pair of opposing leveling screws to take out half of the error observed between steps (2) and
(5)
Rotate the antenna mast mounting plate 180 degrees in azimuth and repeat step (4).
(6)
Repeat step (4) until the level bubble indicates that the pedestal is level at these two positions.
(7)
Observe the position of the bubble in the second level bubble.
(8)
Repeat steps (3) through (6) for the second level.
bubble.
(3).
(9) When the second level bubble indicates that the pedestal is level at these two positions, observe the first
level bubble. Minor adjustments of the leveling screws for each level bubble may be necessary to assure that the
pedestal is level at any position on the azimuth axis.
(10)
When leveling is complete, tighten the pedestal-to-riser base bolts loosened in step (1).
(11) Pedestal Alignment - The servoamplifier has two potentiometers found by removing amplifier cover. After
entire system is aligned, set these two potentiometers (tach feedback and servo gain) at mid-range and turn on servo
drive. Then proceed as follows:
a. Push antenna off null and observe as it returns to null.
b. Increase servo gain until antenna hunts, then reduce gain until antenna returns to null without
excessive hunting.
c. If antenna responds sluggishly, increase gain and stop hunting by increasing tach feedback.
d. If when handwheel control is moved smoothly, antenna follows raggedly, reduce tach feedback and
servo gain to stop hunting.
2-11
CE- 1008
NOTE
Servo gain and tach feedback are interactive controls. Many adjustment settings will work, but
there is only one optimum setting, which can be found only after experimentation in the above
mentioned manner.
(12)
Boresighting - Complete boresighting procedure as described in paragraph 9 of this section.
7. 80-FOOT TOWER ERECTION PROCEDURES
A. ASSEMBLED TOWER - The assembled 80-foot tower is shown in Figure 2-4.
component parts of the 80-foot tower.
Table 5-10 identifies the
B. ERECTION EQUIPMENT - An erection davit, platform, and associated tackle is required for erection of the 80foot tower. This equipment is illustrated in Figure 2-5 and listed in Table 2-1.
TABLE 2-1. 80-FOOT TOWER ERECTION EQUIPMENT
Qty
Required
Part NO.
Description
L-1686-20
L-1686-21
L-1686-22
2123
651
2150
2163
2234
Erection Davit
Hoist Line, 380-Foot
Erection Platform
Tag Line, 140-Foot
Ratchet Wrench With Socket
Tensiometer
Tensiometer Case
Digging Bar
1
1
2
2
2
4
4
1
C. ERECTION PROCEDURE - Refer to Figure 2-6, sheets 1 through 18, for detailed illustrated procedures for
erection of the 80-foot tower.
2-12
CE- 1008
FOLLOWING PARTS ARE ALSO REQUIRED BUT ARE NOT SHOWN.
PART NO.
2150
2234
L-1686-18
L-1686-19
L-1686-7
DESCRIPTION
TENSIOMETER
DIGGING BAR
NYLON ROPE ASSY
NYLON ROPE ASSY
HORIZ CABLE BRACE
Figure 2-4. 80-Foot Tower Assembly, Sheet 1 of 7
2-13
REQD
4
1
1
1
18
CE-1008
DIMENSIONS MARKED AS SHOWN ARE TRUE ONLY IF TOWER IS
LOCATED ON A LEVEL SITE, OTHERWISE THE ANGLES SHOWN
IN VIEWS J AND H WILL DETERMINE THE ANCHOR LOCATIONS.
Figure 2-4. 80-Foot Tower Assembly, Sheet 2 of 7
2-14
CE- 1008
Figure 2-4. 80-Foot Tower Assembly, Sheet 3 of 7
2-15
CE- 1008
Figure 2-4. 80-Foot Tower Assembly, Sheet 4 of 7
2-16
CE- 1008
Figure 2-4. 80-Foot Tower Assembly, Sheet 5 of 7
2-17
CE- 1008
Figure 2-4. 80-Foot Tower Assembly, Sheet 6 of 7
2-18
C E- 1008
Figure 2-4. 80-Foot Tower Assembly, Sheet 7 of 7
2-19
CE- 1008
Figure 2-5. 80-Foot Tower Erection Equipment
2-20
CE- 1008
A.
B.
C.
D.
Insert adjustable legs into sockets of base plates.
Expand and lock base section and place over adjustable legs.
Install horizontal cable braces to be sure that the base section is square,
then use the base section assembly as a template to locate holes in
foundation.
Secure base plates to foundation.
Figure 2-6. 80-Foot Tower Erection, Sheet 1 of 18
2-21
CE- 1008
A. Remove base section.
B. Locate antenna set box in center of base plates.
Figure 2-6. 80-Foot Tower Erection, Sheet 2 of 18
2-22
CE-1008
A.
B.
C.
D.
E.
Expand and lock tower section while lying on its side.
Expand but do not lock base section until it is engaged with tower section.
Engage swing bolts and make fingertight.
Lock base section.
Install restrainer braces.
Figure 2-6. 80-Foot Tower Erection, Sheet 3 of 18
2-23
CE- 1008
A. Tip assembled section to the upright position.
B. Lift section over antenna box and set down on adjustable legs of base plates.
C. Level section by using adjusting hand nuts.
Figure 2-6. 80-Foot Tower Erection, Sheet 4 of 18
2-24
CE- 1008
NOTE: Antenna set box is not
shown for clarity.
A. Install 'adder and erection platforms as shown.
B. Attach tiedown cables to two uprights on ladder side
of tower section.
C. Assemble davit snatch blocks to base plates.
D. Assemble davit on the ground and reeve hoist line
as shown.
Figure 2-6. 80-Foot Tower Erection, Sheet 5 of 18
2-25
CE-1008
A. Install davit by raising to vertical position and hooking on to mid-rail
castings as shown.
B. Tip davit and install backstop and backstop cables.
Figure 2-6. 80-Foot Tower Erection, Sheet 6 of 18
2-26
CE- 1008
A. Tip davit to lifting position.
B. Assemble next section and attach lifting harness and ladder as shown.
C. Hook two tag lines to eyebolts on lifting harness.
Figure 2-6. 80-Foot Tower Erection, Sheet 7 of 18
2-27
CE- 1008
A. Lift section until it is approximately six inches under the top cross bar
of davit. (Section must be carefully guided with tag lines during the
lifting operation. )
B. Swing davit and section over base section.
Figure 2-6. 80-Foot Tower Erection, Sheet 8 of 18
2-28
CE- 1008
A.
B.
C.
D.
E.
Lower section until one upright member can be inserted and bolted.
Unlock slide tube while lifting and holding ladder clear.
Insert and bolt second upright member.
Replace ladder.
Unlock three remaining hinge braces, insert and bolt remaining upright
members.
F. Lock all hinge braces.
G. Unhook ladder from lifting harness and install on section.
H. Install restrainer braces.
Figure 2-6. 80-Foot Tower Erection, Sheet 9 of 18
2-29
CE- 1008
A.
Move erection platforms to next higher position by following sequence
shown above.
Figure 2-6. 80-Foot Tower Erection, Sheet 10 of 18
2-30
CE- 1008
A.
B.
C.
D.
E.
Leave lifting harness installed on section.
Pull up enough slack in hoist line and tie off to a vertical member clear
of davit.
Tip davit to a vertical position and lift hooks clear.
Use hand-over-hand method and raise davit to next position.
Install remaining tiedown cables to base section.
Figure 2-6. 80-Foot Tower Erection, Sheet 11 of 18
2-31
CE- 1008
A.
B.
C.
D.
Swing davit to lifting position.
Prepare next section for lifting and continue operations until tower
is completed.
As each guy level is reached, attach guys.
Apply 600 lbs tension equally to each guy.
Figure 2-6. 80-Foot Tower Erection, Sheet 12 of 18
2-32
CE- 1008
A. When first guy level is reached, install two horizontal cable braces on the tower just below guy level (see
detail D on figure 2-4).
B. Determine the location of the guy anchor as shown on figure 2-4, sheet 2.
C. With the digging bar or a shovel, dig a pilot hole about 6" deep x 12" dia to aid in starting the anchor.
D. Screw anchor into the ground at a 45-degree angle until the top of the eye is not more than 4" above the
ground surface.
E. Attach guy winch to the anchor with clevis or guy spacer (figure 2-4, sheet 5).
F. Pass the slack end of the guy through the snubbing slot of the winch.
G. Leave enough slack in the guy cable to allow at least 1-1/2 turns to be wound on the winch before tensioning
guy.
H. Do not place the guy under too much tension until all four guys of a given set are attached to their winches.
I. Guys should be tensioned simultaneously while checking the tower for plumb.
J. Use the tensiometer as shown in figure 2-6, sheet 14, and tension each guy to 800 lbs. The locking pin must
be installed in the guy winch after each takeup.
K. When proper tension has been reached, continue erecting tower as shown on sheet 12.
Figure 2-6. 80-Foot Tower Erection, Sheet 13 of 18
2-33
CE- 1008
A. The tensiometer, supplied in its case, is used to check the tension of the guys.
B. Use the tensiometer on guy cables as shown above.
C. Turn the knurled adjustment nut until the small calibrating hand moves in
line with the mark scribed on the tensiometer frame.
D. Then read the tension directly from the large indicating hand on the dial.
Figure 2-6. 80-Foot Tower Erection, Sheet 14 of 18
2-34
CE-1008
A. After tower has been fully erected, remove erection davit and lower it to the
ground.
B. Use tab line to lift the following parts and install on the tower in the order
listed:
1. Horizontal cable brace (2)
2. Spacer (4)
3. Anti-twist guy assy (8)
4. Box - lifting davit (4)
5. Outboard support (4)
6. Grip-strut platform (4)
C. Remove horizontal cable braces after guys have been installed and properly
tensioned.
Figure 2-6. 80-Foot Tower Erection, Sheet 15 of 18
2-35
CE- 1008
A.
B.
C.
Remove erection platforms from the tower.
Install davit winches (4) on the vertical members of the first tower section.
Reeve hoist line over the davit sheaves and attach hoisting hooks to antenna
set box.
Figure 2-6. 80-Foot Tower Erection, Sheet 16 of 18
2-36
CE-1008
Figure 2-6. 80-Foot Tower Erection. Sheet 17 of 18.
A. Make sure guys have been properly tensioned at each guy level, then remove all horizontal cable braces and
platforms from inside tower.
B. Carefully hoist box to top of tower by operating all four winches at equal speed.
C. Install box supports (4), then slowly lower the box until it rests firmly on supports.
2-37
CE-1008
Figure 2-6. 80-Foot Tower Erection, Sheet 18 of 18.
A. Relocate the grip-strut platforms from the outboard supports to the inside of the tower.
B. Remove the outboard supports and the box-lifting davits.
C. Install two horizontal cable braces in each tower section except top section and base section (see detail D on figure
2-4, sheet 4).
D. Use erection platforms as shown in figure 2-6, sheet 10.
E. Inflate the radome.
F. Install maintenance hoist.
G. Install grounding system at base of the tower as shown in detail C on figure 2-4, sheet 3.
2-38
CE-1008
D. DISASSEMBLY OF TOWER - Disassembly of the 80-foot tower is essentially the reverse of the procedure
described in Figure 2-6; however, in order to have an orderly cable arrangement inside the folded section, use the two
nylon rope assemblies, part No. L-1686-18 and -19, during the folding operation as described below.
(1) Position the section laying on its side (see Figure 2-7).
(2) Attach the snap hooks of -19 to the four cable crossings in the lower half of the section after
threading the nylon ropes through the section as shown in view 1. Always snap on the hook as shown. The hook axis
has to be in line with the direction of pull.
(3) Attach the snap hooks of -18 to the four cable crossings in the upper half of the section as shown in
view 2.
(4) While two men pull on -18 and -19, have all 8 brace joints unlocked.
(5) Slowly push the 4 uprights together until section is folded. During this operation, see that all cable
thimbles pivot into the pull direction of -18 and - 19.
(6) Gather cables together in two locations and attach 2 hose clamps as shown in view 4.
(7) Remove all hooks and pull out -18 and -19 rope assemblies.
8. SYSTEM INTERCONNECTIONS
A. System interconnection cabling is shown in Figure 2-8. Table 2-2 lists the signals applied to each connector pin.
9. BORESIGHTING PROCEDURE
A. TARGET INSTALLATION - After the mounting location for the Antenna System has been established, but before
the Antenna System has been installed, determine the azimuth of the boresight target as follows:
(1) Locate an r-f signal generator with boresight target at a distance of approximately one-half mile from the
Antenna System.
(2) Set up a transit or similar instrument on the Antenna System mounting location.
(3) Determine the true azimuth of the boresight target from the Antenna System. Record this position.
2-39
CE-1008
Figure 2-7. 80-Foot Tower Disassembly, Sheet 1 of 2.
2-40
CE-1008
Figure 2-7. 80-Foot Tower Disassembly, Sheet 2 of 2.
2-41
CE-1008
Figure 2-8. System Interconnection Cabling Diagram
2-43/2-44
CE-1008
B. CHECK AND ADJUSTMENT - When the Antenna System is installed and operating, check the boresight as
follows:
(1) Turn on the r-f signal generator.
(2) Acquire the r-f signal generator with the Antenna System and note the azimuth indication on the Control
Indicator.
(3) Subtract the indicated azimuth from the azimuth surveyed in step A(3).
(4) Set the AZ ORIENT control on the Antenna Control Power Supply to the algebraic difference determined in
step B(3).
(5) Repeat steps B(2) and B(3) to check boresight.
10. EQUIPMENT RELOCATION
A. Procedures for stowing and relocating the Antenna System are essentially the reverse of installation procedures
given in this section.
B. See paragraph 7 for special procedures applicable to stowing the 80-foot tower.
C. See Figure 2-9 for configuration of the Antenna System in the stowed position.
2-45
CE-1008
Figure 2-9. Antenna System, Stowed Position.
2-46
Item
Qty
Part Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
1
2
1
2
2
5
4
1
12
2
A/R
A/R
A/R
4
4
6
28
16
12
728451
728449
728448
728450
728452
728446
728976
51L1-1X1AA
728459-11
1357
728459-13
RTV-731
HS-25020-50
MS35307-306
MS51957.-87
MS15795-810
MS35338-82
MS35690-410
Nomenclature and Description
BRACKET, Stow, L. H.
BRACKET, Stow, R. H.
BRACKET, Stow, lower
BRACKET, Stow, top
CLAMP, Stow, elevation
BOLT ASSEMBLY, Stow, Elevator Drive supports
STRAP, Canvas
BUNGEE CORD, 3/8 in. dia x 18 in. long
HARD COVER ASSEMBLY
LATCH, Tension, adjust.
PAD, Rubber, solid, 1/16 in. thick
CEMENT, Contact
RUBBER, Foam, 1/2 in. thick
SEALANT, Rubber
INSERT-TAPLOCK, 1/4-20 I.D.
SCREW, Cap, hex. head, 1/4-20 x 3/4 lg.
SCREW, Pan head, 1/4-20 x 2.0 lg.
WASHER, Flat, 1/4 in
WASHER, Lock, split, 1/4 in
NUT, Hex., plain, 1/4-20
Figure 2-9. Antenna System, Stowed Portion, Index.
2-47
CE-1008
TABLE 2-2. CABLING CHART
Plug
& Pin
Plug
& Pin
Signal
J1, Antenna Pedestal
p
r
s
t
u
v
w
x
y
z
MS3102E36-7P
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
R
S
T
U
V
W
X
Y
Z
a
b
c
d
e
f
g
h
j
k
m
n
Servo Reference Hi
Servo Reference Lo
Safety On Light
Spare
Spare
Horizontal Polarization
Vertical Polarization
RHC/45ºPolarization
LHC/45ºPolarization
Pressure & Manual Disable
Cable Wrap Out
Frame Ground
B1S1
B1S2
B1S3
Spare
Beam Width Meter
Spare
Beam Width Increase
Beam Width Decrease
S1 E1 Ckt
S2 E1 Ckt
S3 E1 Ckt
Polarization Activate
Limit Reversing Switch i28V
Limit Reversing Switch
N.C. Contact
Motor Common
Limit Reversing Switch
N. O. Contact
Spare
Spare
Spare
Spare
B4S 1
Pressure & Manual Disable
Shield for h & j
Spare
Spare
Signal
B4R2
B4R1
B4R3
AC Power in Hi
AC Power in Lo
+28-Volts DC
28-Volts DC Return
Spare
Spare
Spare
J2, Antenna Pedestal
MS3112E22-55S
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
T
U
V
W
X
Y
Z
a
b
2-48
28V Return
R1 E1 TX Synchro
Beam Width Meter
Beam Width Increase
Beam Width Decrease
28-Volts DC
28-Volt Return
Frame Ground
Limit Reversing Switch
N.C. Contact
Detent Relay A1K1-6
Limit Reversing Switch
±28V
Polarization Activate
Horizontal Polarization
Vertical Polarization
RHC/45ºPolarization
LHC/45ºPolarization
Motor Common
Detent Relay A1K1-5
Frame Ground
R2 E1 TX Synchro
Spare
Spare
E1 Drive Jumper A
E1 Drive Jumper B
Spare
CE-1008
TABLE 2-2. CABLING CHART (CONT)
Plug
& Pin
c
d
e
f
g
h
i
k
m
n
p
q
r
s
t
u
v
w
y
z
AA
BB
CC
DD
EE
FF
GG
HH
Signal
Spare
Limit Switch
S1 E1 Ckt
S2 E1 Ckt
S3 E1 Ckt
Blower 01
Blower Common
Limit Switch
R2 E1 Ckt
R1 E1 Ckt
E1 Motor Hot
Spare
E1 Motor Common
E1 Motor Hot
E1 Tach Lo
E1 Tach Hi
Tach Ext.
S1 E1 TX
S2 E1 TX
S3 E1 TX
Frame Ground
Blower 02
Spare
Spare
Spare
Spare
Spare
Spare
Plug
& Pin
J
K
L
J4, Antenna Pedestal
MS3112E20-16S
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
Spare
Spare
Spare
Spare
Spare
Frame Ground
Low Pressure Safety On
Pressure Switch Interlock
28V Return
+28 VDC
Spare
Spare
Spare
Spare
Spare
Spare
J1, Control Indicator
MS3112E-20-41P
A
B
C
D
E
F
J3, Antenna Pedestal
MS3112E18-11S
A
B
C
D
E
F
G
H
Signal
R1 E1 TX
R2 E1 TX
Spare
Angle Data TX-S1
Angle Data TX-S2
Angle Data TX-S3
S1 E1 TX
S2 E1 TX
S3 E1 TX
Angle Data TX-R1
Angle Data TX-R2
G
H
J
K
L
2-49
Servo Reference Hi
Servo Reference Lo
Frame Ground
E1 Indicator Drive OA
E1 Indicator Drive Neutral
E1 Indicator Servo Power
Relay
Ant. 1 Drive Power 0C Hi
Ant. 1 Drive Power 0C Lo
Spare
Spare
Ant. 1 Drive Power Relay
CE-1008
TABLE 2-2. CABLING CHART (CONT)
Plug
& Pin
M
N
P
R
S
T
U
V
W
X
Y
Z
a
b
c
d
e
f
g
h
j
k
m
n
p
q
r
s
t
Signal
Az Ind. Servo Power Relay
Spare
Az. Ind. Drive Hi 0 A
+28 VDC
28 VDC Return
Spare
+24 VDC
Spare
Spare
R2 Synchro TX Excitation
R1 Synchro TX Excitation
24 VDC Return
S1 Az. Ant. Position
S2 Az. Ant. Position
S3 Az. Ant. Position
Oriented RSUR R1
Oriented RSUR R3
Shield
S3 Oriented Az. Ant.
Pos. Ant. 1
S2 Oriented Az. Ant.
Pos. Ant. 1
S1 Oriented Az. Ant.
Pos. Ant. 1
6.3 VAC CT
6.3 VAC CT
Spare
Resolver Excitation
Resolver Excitation
Shield
Spare
6.3 VAC CT
Plug
& Pin
E
F
G
H
J3, Control Indicator
MS3112E-36-7S
A
B
C
D
E
F
G
H
I
K
L
M
N
O
P
R
S
T
U
V
W
X
Y
Z
a
b
c
d
e
f
g
J2, Control Indicator
MS3112E-12-10S
A
B
C
D
Signal
S2 Az. Input
S1 Az. Input
R2 Synchro TX Excitation
R1 Synchro TX Excitation
S3 E1 Input
S2 E1 Input
S1 E1 Input
S3 Az. Input
2-50
Servo Ref. 0 A
Servo Ref. Neutral
Safety On Lamp
Spare
Spare
Horizontal Polarization
Vertical Polarization
LH Polarization
Manual Disable Pressure
Safety Interlock
Cable Wrap Pot Wiper
Frame Ground
AZ CT S1
AZ CT S2
AZ CT S3
Spare
Beam Width Pot Wiper
Spare
Beam Increase
Beam Decrease
EL PED CT S1
EL PED CT S2
EL PED CT S3
Polarizer Function F
+28V Polarizer Function E
Polarizer Function H
Polarizer Function G
Polarizer Function J
Spare
Spare
Spare
Spare
CE-1008
TABLE 2-2. CABLING CHART (CONT)
Plug
& Pin
h
j
k
m
n
p
q
r
s
t
u
v
w
x
Y
z
Signal
RSUR Excitation
RSUR Excitation
Shield
Spare
Spare
Shield
Ped Rsvr R1
Ped Rsvr R3
Ant. Drive Power
Ant. Drive Neutral
+28V
28V Return
Spare
Spare
Spare
J1, Power Supply
MS3112E-20-41S
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
T
U
V
W
Servo Ref. 0 A
Servo Ref. Neutral
Chassis Ground
E1 Ind. Drive 0 A
E1 Ind. Drive Neutral
E1 Ind. Servo & Ref.
Drive Relay
Ant. Drive 0 C
Neutral
Spare
Spare
Ant. Drive Relay
Az. Ind. Servo Relay
Neutral
Az. Ind. Drive 0 A
+28 VDC Unregulated
28 VDC Return
Spare
+24 VDC Regulated
Spare
Spare
Plug
& Pin
X
Y
Z
a
b
c
d
e
f
g
h
j
k
m
n
p
q
s
t
Signal
Remote Ref. Neutral
Remote Ref. Hot
24 VDC Return
CDX Input 1
CDX Input 2
CDX Input 3
Orient Resolver R1
Orient Resolver R3
Resolver Shield
CDX Output 3
CDX Output 2
CDX Output 1
Scan Ref.
Scan Ref.
Spare
Resolver Excitation
Resolver Excitation
Spare
Scan Ref. CT
J2, Power Supply
PT02SE14-18S
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
T
U
2-51
Resolver Excitation
Resolver Excitation
Resolver Shield
Spare
Spare
Spare
Spare
Spare
Spare
Resolver Ref.
Resolver Ref.
Resolver Shield
Resolver S1
Resolver S2
Ground
Neutral
Phase B to Scope
Phase A Ref.
CE-1008
TABLE 2-2. CABLING CHART (CONT)
Plug
& Pin
J3, Power Supply
Plug
& Pin
O
P
R
S
T
U
V
W
X
Y
Y
Z
a
b
c
d
e
Signal
MS3102E-18-10P
A
B
C
D
115/208 VAC 0 A
115/208 VAC 0 B
115/208 VAC 0 C
Neutral
J4, Power Supply
MS3102E-32-8S
A
B
C
D
E
F
G
H
J
K
L
M
N
Spare
Spare
Spare
Spare
Spare
Spare
Spare
Spare
Safe Pressure Light
Safe Pressure Light
Spare
Frame Ground
Phase A
Signal
Phase B
Radome Util. 0 B
Phase C
Neutral
Pressure Gauge
Anemometer
Phone
Phone
Deicers On
Spare
Spare
Spare
Spare
Spare
Spare
Spare
Spare
J5, Power Supply
MS3102E- 16-10S
A
B
C
2-52
Phase B
Neutral
Chassis Ground
CE-1008
SECTION III
OPERATION AND ADJUSTMENT
1. GENERAL
This section contains the procedures necessary for proper operation and adjustment of the Antenna System and is
written with the presupposition that operating personnel are thoroughly familiar with the content of the system and its
operating controls. If not, it is recommended that Section V of this manual and the appendix to this manual be reviewed
in detail prior to operation. Prior to system operation, the following cautions and notes should be observed.
CAUTION
•
When the input power cable is attached to the Antenna Control Power Supply and is
energized from an external power source, approximately 208-volts AC should be present in
the power supply at the line side terminals of the ANTENNA SYSTEM POWER circuit breaker,
CB3, and the RADOME POWER circuit breaker, CB1. Before these circuit breakers are turned
on, ensure that the electrical power is within the 208-volt ±10 percent AC limit across any two
of the three line side terminals of any of the circuit breakers by testing the voltage with a
portable meter before placing the circuit breakers to the ON position.
•
Check the AC power source to ensure that the line frequency is within the 48- to 62-CPS limit.
NOTE
Ensure that all switches and circuit breakers on the Antenna Position Control Indicator and
Antenna Control Power Supply are off.
2. RADOME INFLATION
A. After installation, and prior to system operation, the radome should be inflated in accordance with the following
procedures.
3-1
CE-1008
NOTE
It is assumed that during installation the radome guy straps have been positioned at the four
corners of the radome platform and smoothed out so that there are no kinks or twists in the guy
straps.
(1) Station one man at each of the four radome guy cables to stabilize the radome during inflation.
(2) Position the RADOME POWER circuit breaker, CB1, on the Antenna Control Power Supply controlling the
Antenna System to the ON position.
(3) Position the BLOWER switch S3 on the Antenna Control Power Supply to the ON position.
(4) Position the ANTENNA SYSTEM POWER circuit breaker to the ON position.
(5) Observe that the pressure gauge on the Antenna Control Power Supply indicates an increasing pressure.
When the radome is fully inflated, the pressure gauge should indicate approximately 0. 5 PSI and the PRESSURE
SAFE indicator light, DS1, should illuminate.
(6) When the radome is fully inflated, secure the radome guy cables, maintaining an equal tension on each
guy cable.
CAUTION
•
After installation, the radome control circuit breakers should be left on and the blower switch
maintained in the ON position until the system is disassembled for reshipment. Leaving the
radome inflated prevents the possibility of damaging the radome or the antenna feed and
allows instantaneous system operation.
•
Do not operate the DEICER power switch S1 on the Antenna Control Power Supply until the
radome inflates to a safe pressure to avoid damage to the radome, should the automatic
pressure switches in the radome fail. These pressure switches are in series with the deicer
switches. When a safe pressure is reached, the deicer switches should be operated
accordingly to prevent ice from forming on the radome and adversely affecting the antenna
pattern.
3-2
CE-1008
3. ACTIVATING THE EQUIPMENT
A. INITIAL SWITCH AND CONTROL SETTINGS - Prior to performing the procedures contained in paragraph 4 of
this section, the switches and controls on the Antenna Control Power Supply, Antenna Position Control Indicator and
antenna pedestal should be positioned as follows:
(1) ANTENNA CONTROL POWER SUPPLY (See Figure 5-19)
a. CB3, ANTENNA SYSTEMS POWER circuit breaker -ON, for operation of the radome pressure
meters.
b. CB4, SERVO EXCITATION circuit breaker - OFF.
c. AZ ORIENT-O.
(2) ANTENNA POSITION CONTROL INDICATOR (See Figure 5-13)
a. S1, SERVO DRIVE switch - OFF.
b. S2, MODE SELECT switch - MANUAL.
c. R2, SCAN GAIN adjustment - full CCW.
d. R3, SCAN SECTOR adjustment - full CCW.
(3) ANTENNA PEDESTAL
a. SAFE-RUN switch - RUN.
CAUTION
To avoid injury to personnel, the SAFE-RUN switch should be in the SAFE position while
personnel are working in the vicinity of the antenna. Placing SAFE-RUN switch in RUN position
will cause the antenna to rotate, aligning itself in accordance with the commands from the
Control Indicator.
NOTE
Due to the interlock of the SAFE-RUN switch on the antenna pedestal with the SERVO DRIVE
switch, S1, on the Control Indicator, the system will not operate if the SAFE-RUN switch is in the
SAFE position.
Revised January 22, 1968
3-3
CE-1008
CAUTION
The SAFE position of the SAFE-RUN switch assures the servo drive cannot be activated;
however, voltage is still present inside the pedestal.
4. PREOPERATIONAL TEST CHECK LIST
NOTE
Prior to performing the procedures contained in this paragraph, ensure that the procedures
contained in paragraphs 2 and 3 of this section have been performed.
A. INITIAL TURN-ON PROCEDURE
(1) ANTENNA CONTROL POWER SUPPLY (See Figure 5-19)
a. Set CB3, the ANTENNA SYSTEMS POWER circuit breaker, to the ON position. On the Antenna
Position Control Indicator, observe illumination of DS7, AZIMUTH MODE MANUAL indicator light. On the Antenna
Control Power Supply, observe that the RADOME PRESSURE meter is indicating radome pressure, and that the
PRESSURE SAFE indicator light is illuminated.
b. Set CB4, the SERVO EXCITATION circuit breaker, to the ON position.
(2) ANTENNA POSITION CONTROL INDICATOR (See Figure 5-13)
a. Set the S1 SERVO DRIVE switch to the ON position. Observe illumination of DS4 SERVO DRIVE
on indicator and DS21, ELEVATION MODE MANUAL indicator.
NOTE
If DS4 does not illuminate but DS18, the SAFETY ON indicator light illuminates, the SAFE-RUN
switch on the antenna pedestal is in the SAFE position or there is insufficient pressure in the
radome.
b. Rotate the azimuth handwheel CW. Observe that the TRUE AZIMUTH digital counter indicates an
increasing azimuth angle and the cable-wrap meter deflects toward its right red limit marking.
3-4
CE-1008
c. Rotate the azimuth handwheel CCW. Observe that the TRUE AZIMUTH digital counter indicates a
decreasing azimuth angle and the cable-wrap meter deflects toward its left red limit marking.
d. Rotate the LAMP INTENSITY control CW and CCW. Observe that CW rotation brightens and CCW
rotation dims the lights over the TRUE AZIMUTH and TRUE ELEVATION digital counters.
B. STATIC ACCURACY CHECK
NOTE
Prior to performing this check, the AZ ORIENT control on the Antenna Position Power Supply
should be set to zero.
(1) Rotate the azimuth handwheel CW to position the antenna to 120. 0240.0 degrees and to three
intermediate arbitrary positions as indicated on the TRUE AZIMUTH digital counter. Observe and record the antenna
position on the antenna pedestal vernier for each setting of the counter dial. The actual antenna heading should be
within ± 0.5 degree of the azimuth angle indicated on the TRUE AZIMUTH digital counter. Note and record the antenna
position deviation for each of the selected settings.
(2) Repeat step (1) by rotating the azimuth handwheel CCW so that the same positions are approached from
the opposite direction. Record the antenna positions and note that the positions are within ± 0.5 degree of the selected
position.
(3) Rotate the azimuth handwheel to position the TRUE AZIMUTH digital counter to 000.0.
(4) Position the AZ ORIENT control on the Antenna Control Power Supply to 5, 10, and 20 degrees. The
antenna should go to the complement of these settings, i.e., 355 degrees, 350 degrees, and 340 degrees, respectively.
Record the actual antenna position, as indicated on the vernier, for each setting.
(5) Return the AZ ORIENT dial knob to zero.
(6) Rotate the elevation handwheel to 000.0, 045.0, 090.0 degree and to three intermediate, arbitrary positions
as indicated on the TRUE ELEVATION digital counter. Record the actual antenna position as indicated on the vernier on
the elevation drive assembly for each setting.
3-5
CE-1008
(7) Rotate the elevation handwheel to position the TRUE ELEVATION digital counter to 000.9 degree.
C. LIMIT STOP CHECK
(1) Position the MODE SELECT switch, S2, to the MANUAL position.
(2) Rotate the azimuth handwheel CW to +270 degrees, the CW electrical limit. Prior to engaging the
mechanical stop, observe that antenna rotation slows up, as indicated by the cable-wrap meter. When the antenna is in
its CW limit, the needle in the cable-wrap meter should be fully in the right red limit marking.
(3) Rotate the azimuth handwheel CCW to -270 degrees, the CCW electrical limit. Prior to engaging the
mechanical stop, observe that antenna rotation slows up, as indicated by the cable-wrap meter. When the antenna is in
its CCW limit, the needle on the cable-wrap meter should be fully in the left red limit marking.
(4) Rotate the azimuth handwheel CW until the TRUE AZIMUTH digital counter indicates 000.0 degree.
NOTE
If a correction factor is set into the AZ ORIENT control, this factor should be added to the limit to
obtain the actual position in degrees at which the limit stops will be engaged (i.e., if 20 degrees
is set into the AZ ORIENT control, the electrical limit will be engaged at 290 degrees and the
mechanical limit at 310 degrees, as indicated by the azimuth vernier on the counter on the
Control Indicator.
(5) Slowly lower the antenna in elevation, by rotating the elevation handwheel CCW, until the lower electrical
limit is engaged at approximately -15 degrees. Prior to engaging the mechanical stop, observe that antenna rotation
slows up.
a. Repeat step (3), rotating the elevation handwheel CW to the upper electrical limit of +95 degrees.
b. Rotate the elevation handwheel CCW until the TRUE ELEVATION digital counter indicates 000.0.
3-6
CE-1008
D. SECTOR SCAN CHECK (1) With the MODE SELECT switch, S2, in the MANUAL position, rotate the azimuth
and elevation handwheels to position the TRUE ELEVATION to 000. 0.
(2) Rotate the SCAN CONTROL GAIN adjustment, R2, full CCW.
(3) Rotate the SCAN CONTROL SECTOR adjustment, R3, full CCW.
(4) Set the MODE SELECT switch, S2, to the SCAN position. Observe illumination of DS8, the AZIMUTH
MODE SCAN light.
(5) Slowly rotate the SCAN CONTROL SECTOR and GAIN adjustments, R3 and R2, a few degrees CW.
Observe on the TRUE AZIMUTH digital counter that the antenna scans a small angle around 000. 0 degree azimuth at a
slow speed.
(6) Rotate R3 and R2 to various positions and observe that the sector scanned can be increased from
approximately ± 5 to ± 270 degrees around 000. 0 degree azimuth. The rate at which the sector is scanned should
increase with CW rotation of R2. With R3 full CW, the sector scanned should be approximately ± 270 degrees, which
are the electrical limits of the antenna pedestal in azimuth.
(7) During sector scan operation, rotate the elevation handwheel and observe on the TRUE ELEVATION
digital counter that the antenna follows in elevation.
(8) Rotate R3 and R2 full CCW.
E. POLARIZATION CONTROL CHECK
(1) Set the POLARIZATION SELECT switch, S6, to the H position.
(2) Observe that when the antenna is horizontally polarized, all indicator lights, except the horizontal (H) light,
go off.
F. ELECTROMECHANICAL LINEAR ACTUATOR CHECK
(1) On the Control Indicator, set and hold the beam width change switch, S7, to the BEAM INCREASE
position. Observe that the needle on the BEAM WIDTH meter deflects in an increasing direction.
(2) Reposition S7 to the BEAM DECREASE position. Observe that the needle on the BEAM WIDTH meter
deflects in a decreasing direction.
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G. SAFETY CIRCUIT CHECK
(1) Set the SAFE-RUN switch on the antenna pedestal to the SAFE position. Observe, on the Control
Indicator, that the SAFETY ON indicator light illuminates and that the antenna will not drive, regardless of what mode of
operation is selected.
(2) Reposition the SAFE-RUN switch on the antenna pedestal to the RUN position.
NOTE
An automatic pressure safe switch in the radome-platform is also in series with the safety
switches on the antenna pedestal and/or radome junction box. The pressure safe switch opens
when radome pressure falls below approximately 0.3 PSI.
5. SYSTEM ALIGNMENT AND ADJUSTMENT
A. GENERAL - The contents of this subsection are presented with the presupposition that each unit has been
aligned individually in accordance with the procedures contained in Section V.
B. +24-VOLT DC REGULATED ADJUSTMENT
(1) Operate the equipment in accordance with the procedures contained in paragraph 4. A of this section.
(2) Connect a DC voltmeter between TP3 (+) and TP2 (ground) on the Power Supply.
(3) With a screwdriver, rotate potentiometer R1 (Figure 5-20) to obtain a 24-volt readong on the DC voltmeter.
C. BEAM WIDTH METER ADJUSTMENT
(1) Operate the equipment in accordance with the procedures contained in paragraph 4. A of this section.
(2) Position and hold the beam width change switch, S7, to the BEAM DECREASE position until the feed is
fully retracted (as reported by personnel in the radome).
3-8
CE-1008
(3) Adjust potentiometer R5 on the Control Indicator until the needle on the BEAM WIDTH meter is at zero.
(4) Position and hold the beam width change switch, S7, to the BEAM INCREASE position until the feed is
fully extended (as reported by personnel in the radome).
(5) Adjust potentiometer R6 on the Control Indicator until the needle on the BEAM WIDTH meter is at 100.
(6) Repeat steps (2) through (5) until optimum deflection of the needle on the BEAM WIDTH meter is obtained
in either direction.
D. CABLE WRAP ADJUSTMENT
(1) Operate the equipment in accordance with the procedures contained in paragraph 4.A of this section.
(2) Rotate the azimuth handwheel CCW to 90 degrees (-270 degrees limit). The needle on the CABLE WRAP
meter, M1, should deflect in a decreasing direction toward its left red limit marking.
(3) Adjust potentiometer R7 on the Control Indicator until the needle on the CABLE WRAP meter just enters
the left red limit marking.
(4) Rotate the azimuth handwheel CW to 270 degrees. The needle on the CABLE WRAP meter, M1, should
deflect in an increasing direction toward its right red limit marking.
(5) Adjust potentiometer R8 on the Control Indicator until the needle on the CABLE WRAP meter first enters
the right red limit marking.
(6) Repeat steps (2) through (5) until optimum deflection of the needle on the CABLE WRAP meter is
obtained in either direction.
E. SECTOR SCAN ADJUSTMENT
(1) Operate the equipment in accordance with the procedures contained in paragraph 4.A of this section.
(2) Perform the sector scan procedures contained in paragraph 4.D of this section.
(3) If, when scanning a sector, the angle scanned is not equal on either side of 000. 0 degree, within ± 5
degrees, deenergize the equipment and perform the following procedures:
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a. Remove the handwheels, four screws holding the meter panel to the gear box, and the six screws
securing the front panel to the chassis. Lower the front panel.
b. Reenergize the equipment and while scanning a small sector at a slow rate, loosen the three allenhead screws holding the antenna position potentiometer, R4, in position. Slowly rotate R4 on the Control Indicator until
the sector scanned is equal on either side of 000.0 degree within ± 5 degrees.
c. Tighten the allen-head screws loosened in step b. Care should be taken when tightening these
screws to keep the potentiometer from slipping.
d. Reinstall the hardware removed in step a.
(4) If, when scanning, the minimum sector scanned is not approximately ± 5 degrees, rotate potentiometer
A1R8 on the Control Indicator until the minimum sector scanned reaches these limits.
6. OPERATING PRECAUTIONS
A. No special precautions are to be observed during operation of the Antenna System. Operating procedures which
are essential to highlight are supplemented by notes in the operating procedures contained in paragraph 7 of this section.
The following CAUTION is to be observed prior to operation:
CAUTION
Do not operate the system until the green PRESSURE SAFE indicator light on the Antenna
Control Power Supply illuminates when the ANTENNA SYSTEMS POWER circuit breaker, CB3, is
in the ON position. The radome pressure meter should indicate approximately 0.5 PSI.
NOTE
During operation, the AZ ORIENT control should be in the position recorded in paragraph 3.A of
this section.
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7. SYSTEM OPERATING PROCEDURES
A. GENERAL - This subsection presents the procedures required to operate the equipment in each of its three
modes of operation and accomplish each unique operation feature. The AZ ORIENT control on the Antenna Control
Power Supply should be set as follows prior to actual system operation.
(1) AZ ORIENT -Position to compensate for any misalignment of the Antenna System to true north or a
selected reference point. Record the position of this control.
B. MANUAL MODE OF OPERATION
(1) Perform the initial turn-on procedures contained in paragraph 4.A of this section.
(2) Rotate the azimuth and/or elevation handwheels to the desired position.
C. SLAVE MODE OF OPERATION
(1) Perform the initial turn-on procedure contained in paragraph 4.A of this section.
(2) Position the antenna in the approximate azimuth and/or elevation direction of the slaving source with the
azimuth and/or elevation handwheels.
(3) Set the MODE SELECT switch, S2, to the SLAVE position. Observe illumination of DS6, the AZIMUTH
MODE SLAVE indicator light. The slaving source should now have full command of the system.
D. SCAN MODE OF OPERATION
(1) Perform the initial turn-on procedures contained in paragraph 4.A of this section.
(2) With the MODE SELECT switch, S2, in the MANUAL position, rotate the azimuth and elevation
handwheels to position the antenna to the azimuth angle about which it is desired to scan, as indicated on the TRUE
AZIMUTH and TRUE ELEVATION digital counters.
(3) Rotate the SCAN CONTROL GAIN adjustment, R2, full CCW.
(4) Rotate the SCAN CONTROL SECTOR adjustment, R3, full CCW.
(5) Set the MODE SELECT switch, S2, to the SCAN position. Observe illumination of DS8, the AZIMUTH
MODE SCAN indicator light.
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(6) Slowly rotate the SCAN CONTROL GAIN adjustment, R2, a minimum CW.
(7) Slowly rotate the SCAN CONTROL SECTOR adjustment, R3, CW until the antenna is scanning the
required sector.
(8) Slowly rotate the SCAN CONTROL GAIN adjustment, R2, CW to obtain the desired scanning rate. The
antenna will now automatically scan the preset sector at the desired rate.
(9) Rotate the elevation handwheel, on systems with elevation capabilities, as required to increase or
decrease the elevation angle of the antenna.
E. POLARIZATION CONTROL
(1) Set the POLARIZATION SELECT switch, S6, to the desired mode of polarization - H, V, LHC -45, or RHC
+45.
(2) Observe that when the antenna repolarizes as selected, all indicator lights, except the one for the selected
polarization, go off.
F. BEAM WIDTH CHANGE
(1) If it is desired to change the beam width of the antenna while the system is operating in any one of the
three possible modes of operation, set the beam width change switch, S7, to the BEAM INCREASE or BEAM
DECREASE position, as desired.
(2) Hold S7 in the selected position and observe an increase or decrease, depending on the position of S7, on
the BEAM WIDTH meter. Release S7 when the antenna beam, as indicated on the meter, reaches the desired width.
8. STOPPING PROCEDURES
A. When operation of the Antenna System is complete, the system should be shut down in accordance with the
following procedures:
(1) Set the SERVO DRIVE switch, S1, on the Antenna Position Control Indicator, to the OFF position.
(2) Set the SERVO EXCITATION circuit breaker, CB4, on the Antenna Control Power Supply, to the OFF
position.
(3) Set the ANTENNA SYSTEMS POWER circuit breaker, CB3, on the Antenna Control Power Supply to the
OFF position.
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(4) Set the DEICER power switch, S1, on the Antenna Control Power Supply to the OFF position.
CAUTION
The RADOME POWER circuit breaker on the Antenna Control Power Supply should be left on
and the BLOWER switch on the Antenna Control Power Supply maintained in the ON position to
keep the radome inflated. Leaving the radome inflated prevents the possibility of damaging the
radome or the antenna feeds and allows instantaneous operation.
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SECTION IV
MAINTENANCE
1. GENERAL
A. This section and the appendix to this manual provide the instructions necessary for inspection and preventive
and corrective maintenance of the Antenna System. The contents of this section presupposes that maintenance
personnel are thoroughly familiar with the physical makeup of the equipment, the installation and operating procedures,
and detailed theory of operation contained in other sections of this manual. The wiring and schematic diagrams
necessary for troubleshooting the system are contained in Section V of this manual. The simplified schematic diagrams
contained in Section I of this manual simplify system and component troubleshooting.
2. PERIODIC INSPECTION AND PREVENTIVE MAINTENANCE
A. Adherence to the inspection and preventive maintenance procedures and recommendations contained in Table
4-1 and in the appendix to this manual will increase the life of the equipment, assure continuity of service, and maintain
the equipment in peak operation condition.
NOTE
Do not remove radome at any time unless absolutely necessary for maintenance or repair.
TABLE 4-1. PERIODIC INSPECTION AND PREVENTIVE MAINTENANCE SCHEDULE
Component
All
Check
a. Visually inspect cables, connectors, and
all exposed components for signs of wear.
b. Perform a complete operational check.
c. Check the radome, tower, and antenna.
Schedule
Weekly
CAUTION
To avoid injury to personnel, the Antenna Pedestal SAFE-RUN switch should be in the SAFE
position while personnel are working in the vicinity of the antenna. Placing SAFE-RUN switch in
RUN position will cause antenna to rotate, aligning itself to the commands from the Control
Indicator.
Revised January 22, 1968
4-1
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TABLE 4-1. PERIODIC INSPECTION AND PREVENTIVE MAINTENANCE SCHEDULE (CONT)
Component
Check
All
a. Check for loose or damaged cables and
connectors.
b. Check fuses, switches, and relays.
Clean and burnish contacts.
c. Check the radome, tower, and antenna.
All
a. Disconnect all cables and inspect and
clean all receptacles and plugs.
b. Blow the dust out of the interior of all
components.
c. Check for loose mounting screws or other
mounting hardware. Do not exert sufficient force
to damage threads when tightening.
d. Check for corrosion. If present, remove
with sandpaper, polish, apply zinc chromate,
and repaint with matching color.
e. Inspect antenna pedestal and elevation
drive assembly drive motors for moisture
and water seepage. Examine brushes and
replace as required.
f. Check all gear assemblies for dirt, wear,
or looseness.
g. Check level of pedestal.
h. Check each unit for signs of excessive heating,
indicated by burned resistors or melted wax.
i. Check all potentiometers for wear, poor
contact, or noise.
j. Inspect each unit for loose or broken connections,
damaged parts, dirt, or signs of excessive wear.
k. Clean all slides on the electrical units and
apply a thin coating of vaseline or equivalent.
l. Check the radome, tower, and antenna.
4-2
Schedule
Monthly
Quarterly
CE-1008
TABLE 4-1. PERIODIC INSPECTION AND PREVENTIVE MAINTENANCE SCHEDULE (CONT)
Component
All
Check
a. Visually inspect all component parts.
Replace if any component shows evidence of damage.
b. Lubricate the azimuth and elevation drive gear train with
a thin coat of MIL-G-3278A grease.
c. Check the radome, tower, and antenna.
Schedule
Yearly
3. TOOL REQUIREMENT
A. No special tools, other than those listed in Table 1-3, are required for inspection and routine maintenance of the
equipment. It is assumed that a set of standard hand tools are available on site.
4. TROUBLE ANALYSIS
A. The trouble analysis chart, Table 4-2, is designed to enable maintenance personnel to rapidly isolate the cause of
trouble to a specific circuit. Once located, normal troubleshooting procedures may be used to isolate the faulty
component. The most important step in the rapid location of trouble is the application of common sense. Prior to starting
a troubleshooting procedure to locate a trouble, all fuses and switch and control settings should be checked.
B. Since the equipment is primarily electromechanical, most major troubles may be isolated rapidly by observing
the following:
(1) If the system will operate in the local and slave mode, but not in the sector scan mode, the trouble is
probably in the scan generator circuit card. This should be replaced if this trouble occurs.
(2) If the system will not slew in azimuth, the trouble is probably servo-amplifier AR1 in the pedestal.
(3) If the system will not slew in elevation, the trouble is probably in elevation servo-amplifier AR2 in the
pedestal.
4-3
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TABLE 4-2. TROUBLE ANALYSIS CHART
Step
No.
Procedure
Normal Indication
Corrective Step
1
All circuit breakers are turned
off and all switches are turned
off. One man is stationed at each
of the four radome guy cables to
stabilize radome during inflation
and the blower inlets are open.
2
Position the RADOME POWER
circuit breaker, CB1, on the
Antenna Control Power Supply
to the ON position.
Power will be applied to the
open contacts of all contactors
in the radome box.
a) Check input power
b) Check interconnecting cables
3
Position the BLOWER selector
switch, S2, on the Antenna
Control Power Supply to the
ON position.
K1 in radome box closes,
blower rotates.
a) Check pressure switch S3 and
K1 if B1 fails to operate
b) Check rotation of the blower;
if it rotates in the wrong direction,
reverse phase A and B,
phase A and C, or phase B
and C. Reversal of any two
phases will reverse the direction
of the motor. Check
interconnecting cable.
NOTE
The blower will operate in either direction; however, it is more efficient in one direction than the other. Radome inflation time
should be approximately 5 minutes. If it is much longer, blower is probably running in wrong direction.
4-4
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TABLE 4-2. TROUBLE ANALYSIS CHART (CONT)
Step
No.
Procedure
4
Position the ANTENNA SYSTEMS
POWER circuit breaker, CB3, to
the ON position.
5
Observe that the RADOME
PRESSURE gauge on the Antenna
Control Power Supply reaches
approximately 0.5 PSI when the
radome is inflated and that the
PRESSURE SAFE indicator light,
DS1, on the power supply
illuminates.
6
Set CB4, the SERVO EXCITATION
circuit breaker, on the Power Supply,
to the ON position.
7
Set S1, the SERVO DRIVE
switch on the Control Indicator,
to the ON position.
Normal Indication
The RADOME PRESSURE
meter on the Power Supply
should show an increasing
reading as the radome becomes inflated.
Corrective Step
a) If meter is inoperative, check
TP1 in the Power Supply for
+28 volts. Check fuse F4.
a) Check the light bulbs.
b) Check pressure switch S1 in
the radome.
c) Check pressure transducer
MT1 in radome box.
Illumination of DS4, the
drive indicator light.
4-5
a) Check radome pressure.
b) Check SAFE-RUN switch in
radome boxes.
c) Check SAFE-RUN switch on
the pedestal.
CE-1008
TABLE 4-2. TROUBLE ANALYSIS CHART (CONT)
Step
No.
Procedure
Normal Indication
Corrective Step
8
Rotate the azimuth handwheel
clockwise.
The TRUE AZIMUTH digital
counter will read an increasing
azimuth angle and the
CABLE WRAP meter will
deflect toward the right red
limit marking.
a) If, when the handwheel is
rotated, the gear train and the
associated digital counter do
not move, check the azimuth
handwheel clutch.
b) If the counter moves but the
cable-wrap meter does not deflect
toward the right red marking,
check to see that the pedestal
is not in a limit.
c) Check the azimuth servo amplifier
in pedestal.
d) Check servo excitation to the
pedestal.
e) If the antenna moves, but the
CABLE WRAP meter gives no
indication, check the cable-wrap
potentiometer in the antenna pedestal.
9
Rotate the azimuth handwheel
counterclockwise.
Reverse of step 8.
Same as step 8.
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TABLE 4-2. TROUBLE ANALYSIS CHART (CONT)
Step
No.
10
Procedure
Rotate the lamp intensity control
on the Control Indicator clockwise
and counterclockwise.
Normal Indication
The lights over the TRUE
AZIMUTH and TRUE ELEVATION digital counters,
the lights for the BEAM
WIDTH meter, and CABLE
WRAP meter will change
intensity.
Corrective Step
a) Check lamp intensity
potentiometer.
b) Check light bulbs.
NOTE
The AZ ORIENT control on the Power Supply should be set to zero for the following checks.
11
Rotate the azimuth handwheel to
position the antenna to 120º,
240º, and to three arbitrary
positions.
The azimuth angle scale on
the antenna pedestal will
read whatever the TRUE
AZIMUTH digital counter
reads, within ± 1/2º.
4-7
a) Check the zero of the CT in
the pedestal.
b) Check the zero of the Power
Supply CDX.
c) Check the zero of the azimuth
CX in the Control Indicator.
d) If the pedestal does not move,
or moves sluggishly or erratically,
check the azimuth servo amplifier
in the pedestal.
CE-1008
TABLE 4-2. TROUBLE ANALYSIS CHART (CONT)
Step
No.
Procedure
Normal Indication
Corrective Step
12
Position the AZ ORIENT control
to 5, 10 and 20 degrees with the
TRUE AZIMUTH counter on the
Control Indicator set to zero.
The antenna should follow the
complement of these settings
within ± 1/2º.
a) Check zero of the CDX being
rotated.
b) Check zero of the CT in the
pedestal.
c) Check zero of the azimuth CX
in the Control Indicator.
13
Rotate the elevation handwheel
to 0, 45 and 90 degrees and to
three intermediate arbitrary
positions.
The antenna in elevation
should follow within ± 1/2º.
a) If elevation does not move or
moves sluggishly or erratically, check the elevation servo
amplifier in the pedestal.
b) If elevation moves normally
but does not follow within
± 1/2º, check the zero of the
CT in the elevation assembly.
c) Check the zero of the elevation
CX in the Control Indicator.
14
Run the antenna into an azimuth
electrical limit.
The antenna's servo action
will become sluggish 30º
prior to contacting the
mechanical stop.
a) Check the setting of the limit
switches.
b) Check the azimuth limit
resistor.
15
Repeat step 14 for the opposite
limit.
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TABLE 4-2. TROUBLE ANALYSIS CHART (CONT)
Step
No.
Procedure
Normal Indication
Corrective Step
16
Run the elevation into an electrical
limit.
Servo action becomes sluggish
approximately 3ºbefore
contacting a mechanical stop.
a) Check setting of the elevation
limit switches.
b) Check the elevation limit
resistor.
17
With the TRUE AZIMUTH
counter set at zero and SCAN
CONTROL SECTOR and SCAN
CONTROL GAIN controls fully
counterclockwise, set the
MODE SELECT switch, S2, to
the SCAN position.
The antenna will not move;
the AZIMUTH MODE SCAN
indicator light will illuminate.
Check the light bulb.
18
Rotate the SCAN CONTROL
GAIN control to increase the
rate of the sector scanned.
The TRUE AZIMUTH counter
on the Control Indicator
will begin to slowly sector
scan back and forth about
zero. The antenna will
follow.
a) Check the scan generator
card.
b) Check the azimuth servo amplifier
in the Control Indicator.
c) Check the 6.3 -volts AC scan
reference voltage.
d) Check the position of the cam
on S8 in the gear train in the
Control Indicator.
e) Check the +24 volts on sector
scan potentiometer.
4-9
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TABLE 4-2. TROUBLE ANALYSIS CHART (CONT)
Step
No.
Procedure
Normal Indication
Corrective Step
19
Rotate R3 and R2 to various
positions.
Scan speed should increase
and decrease as R2 is
varied. The area sectored
should increase from an
approximate total of 10ºup
to an approximate total of
more than 180º.
a) Check the associated pots.
b) Check the position of the cam
that operates S8.
c) Check the adjustment of the
scan generator card if the
area scanned is not correct.
20
During scan operation, rotate
the elevation handwheel.
The TRUE ELEVATION
counter will change and
the antenna will follow.
Repeat troubleshooting in step 13.
21
Set the POLARIZATION SELECT
switch, S6, to the H position.
All four polarization lights,
H, V, RH and LH, should
light. Three of the four
will go out; the one that
remains lighted will be
the H light.
a) Check the light bulbs.
b) Check the polarization relays
in the Control Indicator.
c) Check the detent relay in the
antenna pedestal.
d) Check the polarization diversity
mechanism. Repeat above
procedure for all four polarization
modes.
22
Repeat step 21 in turn for the
for the V, LH, and RH
positions.
Same as step 21.
Same as step 21.
4-10
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TABLE 4-2. TROUBLE ANALYSIS CHART (CONT)
Step
No.
Procedure
Normal Indication
Corrective Step
23
Switch the beam width change
switch, S7, to the BEAM INCREASE position.
The beam broadener will extend. The BEAM WIDTH
meter will move from left to
right.
a) Check the beam broadener.
b) Check for 28 volts at the
beam width change switch, S7.
c) If the beam broadener operates
but the BEAM WIDTH meter
does not operate, check the
potentiometer on the beam
broadener.
d) Check for 28 volts at this beam
broadener potentiometer.
e) Check the BEAM WIDTH
meter.
24
Set the beam width change
switch, S7, to the BEAM
DECREASE position.
Reverse action of the beam
increase.
Same as step 23.
25
Set the SAFE-RUN switch on
each pedestal to the SAFE
position.
The SAFETY ON lights on
the Control Indicator will
illuminate; the antenna will
not drive.
a) Check the light bulb.
b) Check the switch.
4-11
CE-1008
SECTION V
DESCRIPTION OF COMPONENTS
1.
SYSTEMS DESCRIPTION
A.
GENERAL - This subsection contains a description of the Antenna System and describes the components
therein. The description is referenced to a major component location diagram and to exploded views which clearly
illustrate all of the major components comprising the system. Appendix I, which contains detailed information on the
scope, supplements the information provided in this section.
B.
ANTENNA SYSTEM (See Figure 5-1)
(1) DESCRIPTION - The Antenna System, which is housed in a 16-foot inflatable radome-platform, is
designed for installation on an 80-foot tower, on a portable hoisting unit or on a portable stand. Two guying structures,
one for the portable stand installation and one for the 80-foot tower installation, are provided. Two lightning rod mounts
and one lightning rod are provided. For system shipment and storage, a transit cover with removable panels is provided.
This cover fits over the disassembled Antenna System and is held in position by snap-lock fasteners.
a.
The Antenna System (Figure 5-2) consists of a 9-foot fiberglass paraboloidal reflector fed by a logperiodic dipole feed (item 5), an elevation drive assembly with elevation capabilities of from -15 to +95 degrees, an
elevation drive support casting (item 8), an elevation drive support extension (item 7), an antenna pedestal (item 10) with
rotation capabilities of + 300 degrees, two level bubbles (item 24), an elevation data cable assembly (item 2), three rf
cable assemblies (items 67, 68 and 69), and one portable stand.
b.
The antenna has a very narrow beam width and requires both azimuth and elevation rotation
capabilities in order to search for, locate, and receive rf radiation from a point, or points, in space. The antenna operates
over the frequency range of from 1 to 12 MHz. The antenna is also provided with an electromechanical linear actuator
(beam broadener) with a motor-driven mechanism which provides remotely selectable actuation of the linear movement
of the feed support shaft, relative to the focal point of the reflector. The primary effect of defocusing the feed toward the
reflector from the focal point is to increase the phase error across the reflector, broadening the main lobe by several
degrees and reducing the gain of the antenna. The antenna is capable of generating linear polarization only. Each feed
is mounted on a polarization mechanism which rotates it to any one of four orientations to provide horizontal, vertical,
+45-degree or -45-degree linear polarization. Polarization and beam
5-1
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Figure 5-1. Antenna System, Major Components Location (Sheet 1 of 2).
5-2
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Figure 5-1. Antenna System, Major Components Location (Sheet 2 of 2).
5-3
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Figure 5-2. Antenna System Assembly, Exploded View (Sheet 1 of 2).
5-4
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Figure 5-2. Antenna System Assembly, Exploded View (Sheet 2 of 2).
5-5
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broadening is controlled from the remotely located Control Indicator via cabling to the antenna pedestal, the elevation
data cable assembly from the antenna pedestal to the elevation drive, and a cable from the elevation drive to the
antenna.
(2)
PARTS LIST - Table 5-1 is a major component parts list for the Antenna System and is referenced to
Figure 5-1. Table 5-2 is a parts list for the Antenna System and is referenced to Figure 5-2.
2.
DESCRIPTION OF SYNCHROS
A.
GENERAL - The Antenna System employs synchro devices throughout the positioning and drive circuits
(Control Indicator and Azimuth and Elevation drives) to transmit and receive local and remote antenna position data.
Detailed synchro theory is not included in this handbook; however, a general description of each type of synchro used is
presented.
B.
TYPES OF SYNCHROS USED - Synchro devices used in the Antenna System consist of synchro control
transmitters. control transformers, and differential control transmitters. A brief description of these devices is presented
in the following paragraphs to assist in a better understanding of the system.
(1)
SYNCHRO TRANSMITTERS - Synchro control transmitters (CX) are used in the antenna system. The
control transmitter can drive only a relatively small load. In the Antenna System, the synchro transmitters are used to
drive control transformers (CT). The rotor winding of these synchros consists of a single machine-wound coil with the
axis perpendicular to the shaft. The rotor functions as the excitation for the primary winding of the synchro. The stator is
a cylindrical structure of slotted laminations on which Y-connected coils are wound with their axes 120 degrees apart.
The stator acts as a secondary winding and its excitation is supplied by the rotor through transformer action.
(2)
CONTROL TRANSFORMERS - The control transformer is used as a companion unit with a control
transmitter to comprise a synchro control system. This type of control transformer is designed to supply an AC voltage
from its rotor terminals with a magnitude and phase determined by its angular position relative to that of the control
transmitter and the signal applied to the stator winding. The control transformer differs from the synchro units previously
discussed in several important respects. The rotor winding is never connected to the AC supply voltage, it induces no
voltage in the stator winding, and stator currents are determined only by the voltage supplied to the high impedance
windings. Also, rotor position has very little effect on stator current. There is no appreciable current flowing in the rotor
winding because its output voltage is always applied to a high-impedance load. In the Antenna System, the highimpedance load is the servoamplifier in the Antenna Position Control Indicator or in the antenna pedestal. The rotor is
not attracted to a particular position when voltage is applied to the stator winding. The rotor shaft is turned by an
5-6
CE-1008
external source and produces varying output voltages from the rotor winding. The output voltage of the control
transformer can be varied either by displacement of the rotor or by varying the input data signal applied to the stator
input from the associated control transformer.
(3)
DIFFERENTIAL CONTROL TRANSMITTERS - The differential control transmitters used in the
Antenna System connect the stators of control transmitters to the stators of control transformers so that the rotation of
any one shaft is either the sum of or the difference between the rotation of the other two. Both the rotor and stator
winding of the differential control transmitters consist of three Y-connected coils. The stator of the differential receives its
excitation from the stator of a control transmitter. The voltages appearing across the rotor terminals of the differential
are determined by the magnetic field produced by the stator currents and the physical position of the rotor. The magnetic
field created by the stator currents assumes an angle corresponding to that of the magnetic field in the transmitter
supplying the excitation. If the rotor position changes, the voltage present at the rotor terminals changes.
C.
SYNCHRO ZEROING PROCEDURES - Synchros are factory adjusted to electrical zero at zero-degree
azimuth and elevation. The following procedure should be followed to rezero the synchros if the factory adjustments
have been altered.
NOTE
Before zeroing the synchros on the elevation drive assembly and antenna pedestal, set the
elevation and azimuth angles to zero as read on their respective angle dials. This will place the
azimuth angle in the center of its travel, midway between the limit stops, and the elevation angle
will correspond to horizon pointing.
(1)
CONTROL AND TORQUE TRANSMITTER
a.
Loosen the clamps holding the synchro transmitter in place sufficiently to permit rotating the
synchro by hand with moderate force. Disconnect the external wiring to the stator terminals.
b.
c.
0- to 250-volt scale.
d.
Connect a jumper between rotor terminal R2 and stator terminal S3.
Connect a voltmeter between rotor terminal R1 and stator terminal S2. Set the voltmeter to its
Energize the rotor of the synchro transmitter from a 115-volt, 60-cycle a-c source.
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e.
Carefully rotate the synchro transmitter until the voltmeter indicates approximately 37 volts.
f.
Remove the 115-volt a-c source from the rotor.
g.
Remove the jumper from between R2 and S3 and connect the voltmeter across stator terminals
h.
Reconnect the 115-volt a-c source to R1 and R2.
S1 and S3.
i.
Carefully rotate the synchro transmitter to obtain minimum voltmeter indication and secure the
clamps loosened in step a without moving the synchro transmitter.
j.
(2)
Remove the test connections and replace the original wiring.
CONTROL TRANSFORMER
CAUTION
When 115-volts AC is connected to the control transformer, it may overheat and cause permanent
damage if left connected over 2 minutes. If the zeroing procedure cannot be accomplished
within that time, use 78-volts AC.
a.
Loosen the clamps holding the control transformer in place sufficiently to permit rotating the
transformer by hand with moderate force. Disconnect the external wiring to the stator terminals.
b.
Connect a jumper between stator terminal S1 and rotor terminal R1.
c.
Connect an a-c voltmeter across stator terminal S3 and rotor terminal R2. Set the voltmeter to
its 0- to 250-volt scale.
d.
Apply 115-volt, 60-cycle a-c power from a local source to control stator terminals S1 and S3.
e.
Carefully rotate the control transformer to obtain minimum voltmeter indication.
f.
Remove the 115-volt a-c power source from the rotor.
g.
Remove the jumper from between terminals R1 and S1 and connect between terminals S1 and
S3.
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h.
Connect an a-c voltmeter across rotor terminals R1 and R2. Set the voltmeter to its 0- to 5-volt
i.
Apply 115-volt, 60-cycle a-c power from a local source to stator terminals S1 and S2.
scale.
j.
Carefully rotate the control transformer to obtain minimum voltmeter indication and secure the
clamps loosened in step a without moving the control transformer.
k.
(3)
Remove the test connections and replace the original.
DIFFERENTIAL CONTROL TRANSMITTER
a.
Position the orient control on the front panel of the Antenna Control Power Supply for the
differential to be zeroed to 0 degree.
b.
Loosen the clamps holding the differential control transmitting synchro in place sufficiently to
permit rotating the differential by hand.
c.
Remove all rotor and stator connections from the differential.
d.
Connect a jumper between rotor terminals R1 and R3.
e.
Connect a jumper between stator terminals R1 and S3.
f.
Connect a 115-volt, 60-cycle, a-c source between stator terminals S2 and S3.
g.
Connect a 0- to 250-volt a-c voltmeter, using the 0-to-250 scale, between the R2 and S2
terminals of the differential. Rotate the differential until the voltmeter indicates minimum.
h.
Remove the 115-volt a-c source from terminals S2 and S3.
i.
Disconnect the voltmeter from between terminals R2 and S2.
j.
Remove the jumper from between rotor terminals R1 and R3.
k.
Connect the 115-volt a-c source between rotor terminals S2 and S3.
l.
Set the voltmeter to the 0- to 5-volt scale and connect across rotor terminals R1 and R3.
m.
Rotate the differential until a null reading is obtained on the voltmeter and carefully secure the
clamps loosened in step b without moving the differential.
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n.
Remove the test connections and replace the original wiring.
CAUTION
The differential control transmitter will overheat if connected to the 115-voit AC for any length of
time. If the zeroing procedure cannot be accomplished quickly, use an autotransformer and 70volts AC.
3.
ANTENNA
A.
The antenna consists of a 9-foot fibreglas paraboloidal reflector fed by a log-periodic dipole feed. The
antenna is capable of generating any one of four modes of polarization: horizontal, vertical, right-hand 45 degrees, or
left-hand 45 degrees linear. Polarization selection is controlled from the remotely located Control Indicator and
implemented by a polarization unit (refer to paragraph 5, this section) which rotates to place the feed at the correct angle
for the polarization selected. An electromechanical linear actuator is installed between the polarization unit and the
dipole feed. The actuator contains a motor-driven shaft which displaces the feed in respect to the focal point of the
reflector, broadening the secondary radiation pattern and reducing the gain of the antenna. Beam broadening is also
remotely controlled by the Antenna Position Control Indicator.
B.
The 9-foot diameter antenna reflector is constructed of 1/8-inch thick fiberglass which contains a metallic
coating to provide the required reflectivity. It is formed with a circular center section about 40 inches in diameter and
four equal segments which fit around the perimeter of the center section. The five parts of the dish are fastened together
by quarter-turn, tee-handle, quick-release pins on the inside flanged edges and quarter-turn clasp hook fasteners around
the outer rim. The four outer segments are easily fastened to the center section and adjacent sections by inserting the
quick release pins which are captive or short lengths of flexible cable adjacent to the attaching holes. The outside
segments are clamped together at the perimeter by four three-quarter inch, hex-head, eccentric cam fasteners. The
dipole feed is mounted on the electromechanical actuator which, in turn, is mounted on the polarization unit and is
correctly oriented on the polarization unit by key pin-hole arrangement. The feed-polarization unit is held in place at the
focal point of the reflector by three supports secured to the outer rim of the reflector. These supports and the attaching
hardware have been predrilled for key pins to assure that the feed is installed at the reflector focal point during assembly.
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4.
ANTENNA VSWR TESTS AND TROUBLESHOOTING
A.
VSWR TESTS - Figure 5-3 illustrates the test setup required to perform VSWR tests on the antenna. To
obtain true VSWR of the antenna under test, the VSWR as indicated should be corrected for the loss due to the length of
RG-87/U cable used.
B.
TROUBLESHOOTING - Troubleshooting of the antenna is performed by measuring the VSWR at the input
(back) of a parabola. A VSWR of 3: 1 or less indicates proper operation. If VSWR exceeds 3: 1, move along the feed
line, measuring wherever a connector permits a break in the line, until an acceptable reading (less than 3: 1) is obtained.
The component measured just prior to the acceptable measurement should be the faulty component.
5.
POLARIZATION UNIT (See Figure 5-4)
A.
GENERAL DESCRIPTION AND THEORY OF OPERATION - The polarization unit for the antenna consists
of a 28-volt DC drive motor, a Geneva drive mechanism, four high-speed cam-operated switches, S1 through S4, and an
indexing switch, S5. The motor actuates the Geneva drive mechanism which, in turn, operates the polarizing device
through 135 degrees of rotation to obtain horizontal, vertical, +45-degree or -45-degree linear polarization. In order that
the motor will stop at a precise point, the indexing or zero-seeking action consists of two parts to provide the accurate
polarization control. The first is through the Geneva drive mechanism (an 8-position-per-revolution control), which
provides a coarse control for the polarization movement, and the second is through an indexing control which
deenergizes the motor at a precise position and at the same time applies an electric braking action to the motor.
(1)
One set of contacts on the high-speed cam-operated, fine-indexing switch, S5, provides a cycling
action of a detent relay in the antenna pedestal. This cycling action operates the detent relay to interrupt the 28-volt DC
supply to the drive motor at each detent position. Therefore, when the motor-driven polarizer reaches either limit of
travel (or one of the intermediate stop positions), the voltage to the motor is cut off so that the motor stops. Then
reversed polarity of 28-volts DC can be supplied to reverse the motor and permit the polarizer to progress to the selected
position.
(2)
The cam which operates the indexing switch turns one full revolution in progressing to each
polarization control position. There are four control positions marked H, V, RHC, or +45o, and LHC, or -45°. These
positions represent horizontal, vertical, right-hand 45 degrees, and left-hand 45 degrees linear polarization, respectively.
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Standing Wave Amplifier:
Hewlett-Packard 415B
Generator:
Hewlett-Packard 614A (800-2100 MCS,
Hewlett-Packard 616B (1800-4200 MCS)
Hewlett-Packard 618B (3.2-7.6 MCS)
Hewlett-Packard 620A (7-11 KMC)
Hewlett-Packard 626A (10-0-15.5 KMC)
Slotted Line:
Hewlett-Packard 805C (500-4000 MCS)
Hewlett-Packard 809B Universal
Probe Carriage
Hewlett-Packard 442B Broad Band Probe
Hewlett-Packard 440A Detector Mount
(2.6-12.4 KMC)
Hewlett-Packard Slotted Section 806B
(3.0-12.0 KMC)
HIGH FREQUENCY, 9-FOOT REFLECTOR
12648
017
736360
Figure 5-3. VSWR Test Setup
Revised January 22, 1968
5-12
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Figure 5-4. Polarization Diversity Mechanism, Schematic Diagram.
5-13/5-14
CE-1008
(3)
When the system is energized and ready for operation, the POLARIZATION MODE select switch on
the Control Indicator may be set to the desired mode; for example, RHC +45°. The motor then starts and runs until it
reaches the right-hand 45-degree position. At this time, the normally closed contacts on the RH switch, S3, open and
then the normally open contacts close. Also in the circuit is an index switch which physically supports the feed element
in the unit. Due to the fine action of this switch, its contacts remain closed until the polarizer reaches a precise position,
at which time its closed contacts open and its open contacts close, resulting in two important functions: connecting a
resistive load across the motor, providing an effective electromagnetic braking action to the motor, and at the same time
reversing the polarity of the 28-volts DC which was received through the reversing switch contacts. This leaves the
circuit in a ready condition for the next actuation.
B.
SCHEMATIC DIAGRAM AND PARTS LIST - Figure 5-4 is the schematic diagram for the polarization unit.
The parts list is contained in Table 5-5.
6.
ELECTROMECHANICAL LINEAR ACTUATOR (See Figure 5-5)
A.
GENERAL DESCRIPTION AND THEORY OF OPERATION - The electromechanical linear actuator consists
essentially of a reversible DC motor geared to a movable shaft, two electrical limit switches, and a position indicator
potentiometer. The DC drive motor is controlled by a DPDT BEAM INCREASE BEAM DECREASE switch on the
Antenna Position Control Indicator which, when operated, applies 28-volts DC to one or the other fields of the motor,
causing the geared shaft to extend or retract, depending upon the direction of rotation of the drive motor. The length of
the actuator in its fully retracted position is 17. 375 inches and in its fully extended position 29.375 inches. Mechanical
stops are provided at these points. Two electrical limit switches are provided which limit extension and retraction of the
actuator shaft to 29.250 and 17.500 inches, respectively. The position indicating potentiometer, which is also geared to
the actuator drive motor, provides a voltage which is proportional to amount of extension of the actuator shaft to drive the
BEAM WIDTH meter on the Antenna Position Control Indicator.
(1)
The electromechanical actuator is installed between the dipole feed and the polarization unit. The
primary purpose of this unit is to provide remotely selectable actuation of the linear movement of the dipole feed relative
to the focal point of the reflector. The primary effect of defocusing the antenna feed toward the reflector from the focal
point is to increase the phase error across the reflector, broadening the main lobe by several degrees and reducing the
gain of the antenna.
B.
ADJUSTMENTS - The only adjustment possible on the electromechanical linear actuator is the position
indicator potentiometer. This potentiometer should be adjusted as follows:
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Figure 5-5. Electromechanical Linear Actuator, Wiring Diagram.
5-16
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(1)
Position the actuator to its center position.
(2)
Connect an ohmmeter from pin H to pin A on connector P1.
(3)
Loosen the screws holding the potentiometer in position and rotate the potentiometer until the
ohmmeter indicates one-half the total resistance of the potentiometer.
(4)
Tighten the screws loosened in step (3).
C.
WIRING DIAGRAM AND PARTS LIST - Figure 5-5 is a wiring diagram of the electromechanical linear
actuator. The parts list is contained in Table 5-6.
7.
ANTENNA PEDESTAL (See Figure 5-6) A. GENERAL DESCRIPTION AND THEORY OF OPERATION - The
antenna pedestal used with the Antenna System consists of a cylindrical riser base (item 7) which houses the azimuth
servo drive assembly (item 1), azimuth electric pressure brake, and motor control units (items 10 and 11).
(1)
The azimuth servo drive assembly consists of an AC servo motor and a gear train connected to a
vertical tubular shaft mounted in a precision bearing assembly. This assembly has a mounting flange on top for
mounting the antenna mast. An angle scale, which is graduated from 0 to 360 degrees and attached to the vertical
tubular shaft and two index markers, one at zero and one 180 degrees, attached to the stable part of the riser base,
provides a visual indication of the pedestal's azimuth rotation. An azimuth synchro assembly which contains two
synchros, two rotary electrical limit switches, a resolver, and a cable-wrap potentiometer is also geared to the azimuth
drive motor. The synchros provide control and data signals for the azimuth axis. The resolver provides position
information to the display scope. The electrical limit switches limit rotation of the azimuth axis to ±270 degrees. The
limit switches engage 30 degrees before mechanical stops in the azimuth drive assembly and act as a buffer for the
mechanical stops. The detailed theory of operation for the synchros is contained in paragraph 2 of this section. The
theory of synchros, cable-wrap potentiometer and limit switches as used in the Antenna System is contained in Section I.
The azimuth electric pressure brake in the azimuth drive assembly is a solenoid-operated brake which engages any time
power is removed from the antenna pedestal. With the pedestal deenergized, the brake may be manually released by
rotating the release knob in a clockwise direction as shown on Figure 5-7.
5-17
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Figure 5-6. Antenna Pedestal, Major Components Location (Sheet 1 of 2).
5-18
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Figure 5-6. Antenna Pedestal, Major Components Location (Sheet 2 of 2).
5-19
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Figure 5-7. Electric Brake Details.
5-20
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(2)
Two motor control units are used in each antenna pedestal. These units are designated motor control
No. 1 and No. 2. Motor control No. 2, which is designated unit A1, consists essentially of terminal strips A1TB1 through
A1TB3, resistors A1R1 through A1R4, and capacitors A1C1 through A1C3. Motor control No. 1, which is designated unit
A2, contains servoamplifier A2AR1 (see Figure 5-8), radio interference filters A2FL1 through A2FL2, capacitors A2C1
through A2C4, resistors A2R1 and A2R2, and terminal boards A2TB1 and A2TB2. The detailed theory of operation of
the pedestal electrical components is contained in Section I.
(3)
A safety switch (item 56) on the riser base, with the positions SAFE and RUN, controls operating power
to the pedestal servo drive. When in the SAFE position, the servo drive is disabled.
CAUTION
When the servo drive is disabled, voltages are still present inside the riser base.
B.
ADJUSTMENTS AND REPAIR - The components requiring adjustment on the antenna pedestal are:
synchros, cable-wrap potentiometer, limit switches, and the electric pressure brake. The synchro adjustment procedures
are contained in paragraph 2 of this section. Procedures for adjustment of the cable-wrap potentiometer, limit switches,
and electric pressure brake are contained in subsequent paragraphs as are procedures for repair of the pressure brake.
(1)
LIMIT SWITCH ADJUSTMENT
a.
Release the electric brake.
b.
Connect an ohmmeter across the azimuth limit resistor.
c.
Rotate the pedestal CW to 270 degrees, as indicated on the azimuth vernier.
d.
Loosen the three allen-head screws holding the upper section of the limit switch in position.
Slowly rotate the switch until the ohmmeter just indicates zero.
e.
Tighten the retaining screws on the limit switch.
f.
Rotate the pedestal CCW through 0 to 90 degrees, as indicated on the azimuth vernier.
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Figure 5-8. Schematic - AC Servo Amplifier
5-23/5-24
CE-1008
g.
Loosen the three allen-head screws holding the lower section of the limit switch in position.
Slowly rotate the switch until the ohmmeter just indicates zero.
h.
(2)
Tighten the retaining screws, remove the ohmmeter, and release the pressure brake.
CABLE WRAP ADJUSTMENT
a.
Release the electric brake and position the pedestal to the O-degree position as indicated on the
b.
Connect an ohmmeter across A1TB1-7 (CW) and J1-K.
azimuth vernier.
c.
Loosen the three screws holding the cable-wrap potentiometer, A3R1, in the antenna pedestal
and slowly rotate the potentiometer until the ohmmeter indicates the center of the total resistance.
d.
Tighten the retaining screws, remove the ohmmeter and reengage the electric brake.
(3)
ELECTRIC BRAKE, INSTALLATION AND ADJUSTMENT (See Figure 5-7)
a.
INSTALLATION PROCEDURE
1.
Locate the hub (part F) on the motor shaft 5/16 inch from the mounting face and set the
2.
Remove the housing, support plate assembly, stationary ring and friction lining.
3.
Attach the endplate to the motor endbell.
4.
Reassemble the items removed in step (2).
screw securely.
b.
ADJUSTMENT FOR LINING WEAR
1. With the power off and the indicator knob (part G) at NORMAL position, indicates the brake is
in proper adjustment.
2.
When the indicator knob is at the ADJUST position, or if marked increase in stopping time
is noted, lining wear adjustment is necessary.
3.
To adjust the lining.
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(a)
Rotate the wear adjustment screws (part M) approximately one-eighth turn
(b)
The solenoid gap should be 7/16 inch when in proper adjustment.
clockwise.
(c)
Maximum torque may be obtained after operating the brake several times and then
rotating either wear adjustment screw very slightly either way and noting which position of fine adjustment provides
satisfactory stopping without changing the solenoid gap.
c.
REPLACEMENT OF FRICTION LININGS
1.
To replace the friction linings.
(a) After the housing has been removed, remove the 3 screws (part A) holding the
support plate assembly (part B) to the endplate (part C) and lift the support plate assembly from the endplate.
(b)
Remove the stationary ring (part D) and lining (part E).
(c)
Reassemble with new lining.
(d) With the coil deenergized, rotate both wear adjustment screws
(part H)
counterclockwise until the brake lining is free to rotate or until the solenoid gap is not increased by further rotation of the
wear adjustment screws.
(e) Rotate one wear adjustment screw clockwise until the solenoid plunger moves
downward slightly. Repeat utilizing the other wear adjustment screws. The initial movement of the plunger occurs when
the wear adjustment screw contacts the stationary ring (part D).
d.
REPLACEMENT OF SOLENOID COIL
1. Disconnect the solenoid from circuit.
2.
Insert a screwdriver between the support plate (part K) and the lever arm (part L).
3.
solenoid link and plunger.
Wedge apart and remove the bearing and pin (part N) and solenoid lever (part M) with the
4.
Remove the coil clamp screw and washer (part P), coil clamp (part Q), and coil holder and
5.
Remove old coil and insert new coil. Reassemble and connect leads.
plunger guides (part R).
5-26
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C.
SCHEMATIC DIAGRAM AND PARTS LIST - The schematic diagram for the antenna pedestal is contained
in Figure 5-9. The parts list for the antenna pedestal is contained in Table 5-3 and referenced to Figure 5-6 for
component location. The parts list for the azimuth drive assembly is contained in Table 5-4.
8.
ELEVATION DRIVE ASSEMBLY (See Figure 5-10)
A.
GENERAL DESCRIPTION AND THEORY OF OPERATION - The elevation drive assembly, which consists
essentially of a yoke assembly (item 8), a housing (item 2), and a drive motor (item 3), supports the antenna and tilts it in
elevation. The yoke assembly, a nonrotatable assembly with a stationary drive gear, is bolted to an elevation drive
support casting which couples the azimuth drives to the elevation drive. The elevation housing, a U-shaped casting
which is bolted to and supports the antenna, is supported through roller bearings in the yoke assembly. The drive motor,
when powered, drives the elevation housing around the yoke assembly. An angle scale, graduated from 0 to 360
degrees, affixed to the movable housing and an index marker affixed to the stable elevation yoke, provides a visual
indication of the elevation angle of the antenna and, during installation, allows orientation of the antenna to O-degree
elevation. Two mechanical limit stop assemblies (item 9) prevent movement of the elevation housing below -18 degrees
and above +98 degrees. An electrical limit switch (item 7), which acts as a buffer for the mechanical stops, makes
contact 3 degrees before the mechanical stops. Two synchros (items 4 and 5) provide control and data signals for the
elevation axis. An electric pressure brake (item 6), which is released when power is applied to the system, prevents
movement of the antenna in elevation when the system is not operating. The detail theory of operation of the circuits in
the elevation drive assembly is contained in Section I.
B.
ADJUSTMENT AND REPAIR - The components requiring adjustment on the antenna pedestal are the
synchros, electrical limit switch, and the electric brake. The synchro adjustment procedures are contained in paragraph
2, this section, and the electric brake adjustment procedures in paragraph 7.B(3), this section. Procedures for adjustment
of the electrical limit switch are contained in the following paragraph.
(1)
LIMIT SWITCH ADJUSTMENT
a.
Release the electric brake.
b.
Connect an ohmmeter between pins k and d on receptacle connector J1 on the elevation drive
c.
Position the elevation housing to 345 (-15) degrees, as indicated on the elevation vernier.
assembly.
5-27
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Figure 5-9. Schematic, Antenna Pedestal.
5-29/5-30
CE-1008
Figure 5-10. Elevation Drive Assembly, Major Components Location.
5-31
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d.
Loosen the two screws holding the switch actuator block on the elevation yoke and position the
block until the ohmmeter just indicates zero.
e.
Tighten the screws loosened in step d.
f.
Position the elevation housing to +95 degrees, as indicated on the elevation vernier, and repeat
steps d and e for the other switch actuator.
C.
SCHEMATIC DIAGRAM AND PARTS LIST - The schematic diagram for the elevation drive assembly is
contained in Figure 5-11. The parts list for the elevation drive assembly is contained in Table 5-7 and referenced to
Figure 5-10 for component location.
9.
RADOME-PLATFORM
A.
Section I of this manual contains information concerning the radome-platform circuits which are
interconnected with other circuits in the Antenna System. The schematic diagram for the radome box is shown in Figure
5-12.
10.
PORTABLE STAND AND HOISTING UNIT (See Figure 2-2)
A.
DESCRIPTION - The portable stand and hoisting unit consists of four tubular aluminum alloy winch support
legs approximately six feet high; four hoisting unit baseplates 14 inches square; four pairs (eight identical) of tubular
aluminum outrigger support tie rods which form the braces for the wind support legs; eight blue/white end tensioning tie
rods; four winches, four T-bar assemblies, four red end tensioning tie rods; eight adjustable tie rods, four horizontal
bottom braces, four horizontal top braces, and four box supports. The winch support legs are spaced and braced in place
by the tensioning tie rods, which have threaded clevis bolts at the ends. The clevis bolts have right-hand and left-hand
threads which permit tightening each corner assembly into a rigid structure. The tensioning tie rods and corner outrigger
support tie rods are attached with bolts to mating pads welded to the winch support legs, hoisting unit support baseplate,
and outrigger support tie rods. A hand-operated winch is mounted on each vertical support. A cable from the winch
passes over two pulleys mounted on the T-bar and is attached to the radome-platform base. When the hand crank on
the winch is turned, it raises or lowers the radome. Holes in the corners of each hoisting unit support and outrigger
support tie rod baseplate are provided for securing the baseplates in place with ground stakes. The portable hoisting unit
is used for lifting a radome-platform out of the transporting trailers for lowering them to the ground. This is done when
the radome-platform is installed on an 80-foot tower. The same hoisting procedure is used for lifting the radome-platform
to mount it on the portable stand so that the radome-platform can be operated while it is supported by the portable
hoisting unit. Box supports bolt to the radome base to hold it securely in operating position.
5-32
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Figure 5-11. Schematic, Elevation Drive Assembly.
5-33/5-34
CE-1008
Figure 5-12. Radome Box, Schematic Diagram.
5-35/5-36
CE-1008
NOTE
•
Careful leveling of the areas for locating the baseplates for the portable hoisting unit will
greatly facilitate installation.
•
Four installers can assemble the portable hoisting unit to a ready condition in
approximately a half hour.
B.
PARTS LIST - The parts list for the portable hoisting unit is contained in Table 5-8 and referenced to Figure
2-2.
11.
ELEVATION DRIVE ASSEMBLY HOIST (See Figure 2-3)
A.
DESCRIPTION - The elevation hoist consists of three sections: a lower section which contains the winch
drum and bolts to the elevation drive support casting when used to install the elevation assembly, a tubular middle
section, and a top T-shaped support with two pulleys. Use of the elevation hoist is illustrated in Figure 2-3 and discussed
in Section II of this manual. The hardware for attaching the hoist to the elevation drive support casting is also included
as a part of the elevation hoist.
B.
12.
PARTS LIST - The parts list for the elevation hoist is contained in Table 5-9.
80-FOOT TOWER
A.
DESCRIPTION - An 80-foot tower is provided for mounting the antenna system well above any nearby
interference such as hills or buildings. The tower (Figure 2-4) consists of a base section, ten tower sections, and
associated braces, guys, anchors, ladders, etc. Davits and winches are provided with the tower for lifting the antenna
assembly and other supplies to the top of the tower.
B.
13.
PARTS LIST - The parts list for the tower is contained in Table 5-10.
ANTENNA POSITION CONTROL INDICATOR
A.
GENERAL - An Antenna Position Control Indicator is provided with the QRC-280(A) Antenna System. It
contains the controls necessary to operate the Antenna System simultaneously in azimuth and elevation and provide a
decimal display of the true azimuth and elevation position of the antennas, relative to the E and H planes. The azimuth
and elevation controls allow selection of the mode of system operation - scan, manual, or slave. in the scan mode of
operation, a scan generator in the unit allows the antenna to scan a predetermined
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sector in azimuth, within a maximum sector of ±270 degrees around the true azimuth zero reference. In this mode, the
antenna elevation angle is controlled as in the manual mode. In the manual mode, synchros, driven by manually
operated handwheels on the front panel of the unit, provide the control voltages required to position the antenna in
azimuth and elevation. In the slave mode, control voltages from a radar or remote antenna system supply the azimuth
and elevation positioning control voltages through switches in the unit.
(1)
Additional controls are provided which allow the polarization of the antenna to be changed and the
beam width of the Antenna System to be increased or decreased. A meter is provided which visually indicates the beam
width by percentage of increase from the fixed focal point of the reflector. A cablewrap meter with a "0" center and two
red limit markings affords a visual indication of the azimuth cable wrap in the antenna pedestal.
B.
THEORY OF OPERATION - This subsection contains the theory of operation for the components within the
Control Indicator. A detailed description of these components, as used in the system. is contained in paragraph 2,
Section I, of this manual. The theory of operation of the synchro devices used on the Control Indicator is contained in
paragraph 2 of this section.
(1)
FUNCTION OF OPERATING CONTROLS AND INDICATORS (See Figure 5-13)
a.
SERVO DRIVE SWITCH AND INDICATORS - The SERVO DRIVE switch (item 8), S1, which is
interlocked with the SAFE-RUN switch on the antenna pedestal, provides 28-volts DC to operate relays K2 and/or relay
K3 on the Power Supply, depending on the position of switch S3. The indicator light, D64 (item 7), illuminates when the
switch S1 is in the ON position and power is being applied to the servo drive. The SAFETY ON indicator light, DS18
(item 18), illuminates if the SAFE-RUN switch on the antenna pedestal is in the SAFE position.
b.
ANTENNA OPERATION CONTROLS AND INDICATORS - The antenna operation controls and
indicators consist of the MODE SELECT switch (item 16), S2; the AZIMUTH MODE SCAN (item 13), MANUAL (item 14),
and SLAVE (item 15) indicator lights, DS8, DS7 and DS6, respectively; the ELEVATION MODE MANUAL (item 25) and
SLAVE (item 26) indicator lights DS21 and DS20, respectively; and the azimuth and elevation handwheels (items 10 and
3, respectively).
1.
The MODE SELECT switch, S2, with SCAN MANUAL and SLAVE positions, provides
selection of the desired mode of system operation. The selected mode of operation is indicated by illumination of the
associated AZIMUTH MODE and ELEVATION MODE indicator lights. DS8, DS7 or DS6, and DS20 or DS21.
5-38
C E-1008
Figure 5-13. Control Indicator, Antenna Position, Operating
Controls and Indicators
5-39
CE- 1008
2. The azimuth and elevation handwheels are connected through magnetic clutches (L1 for azimuth, L2 for
elevation) to control transmitter synchros B1 and B5, respectively. When the system is energized and placed in the
manual mode of operation, 28-volts DC is applied through contacts of switch S2 to energize the magnetic clutches,
connecting the handwheels to their respective synchros. Rotation of the handwheel causes the respective synchro to
generate an error voltage which is used to reposition the antenna.
c. POLARIZATION CONTROLS AND INDICATORS - The polarization controls and indicators consist of the
POLARIZATION SELECT switch (item 22), S6; and the POLARIZATION V (item 23), H (item 24), RHC/+45 (item 21),
and LHC/-45 (item 20) indicator lights, DS15, DS16. DS14, and DS13, respectively.
1. The POLARIZATION SELECT switch, S6, allows selection of the desired mode of polarization. The
OPERATE pushbutton switch, S5, when depressed, implements the polarization change. When the antenna is
repolarized to the selected position, all indicator lights except the one associated with that position will go off.
d. BEAM WIDTH CONTROLS AND INDICATORS - These controls and indicators consist of the BEAM WIDTH
meter (item 5), M2, and the BEAM INCREASE BEAM DECREASE switch (item 4), S7.
1. The BEAM WIDTH meter, M2, which is graduated from 0 to 100, is electrically connected to a potentiometer
on the electromechanical linear actuator and indicates the position of the antenna feed as a percentage of increase
relative to the focal point of the antenna.
2. The BEAM INCREASE BEAM DECREASE switch, S7, is electrically connected to a reversible DC drive
motor on the electromechanical linear actuator on the antenna. Operation of switch S7 to the BEAM INCREASE position
energizes the DC drive motor, which is geared to a shaft supporting the antenna feed, driving the shaft toward the
antenna (i.e., extending the shaft). Operation of S7 to the BEAM DECREASE position causes the shaft to retract.
e. DIGITAL COUNTERS - Two digital counters, a TRUE ELEVATION counter (item 1) and a TRUE AZIMUTH
counter (item 12), are provided to indicate the azimuth and elevation angles of the antenna in degrees and tenths of
degrees.
f. CABLE WRAP. METER - The CABLE WRAP meter (item 6), M1, is essentially a 0- to 50-millimeter with a zero
center-scale marking and red markings, which indicate the limits of the cable wrap in either a CW or CCW direction at
either end.
5-40
CE- 1008
(2) LOCATION AND FUNCTION OF TEST POINTS AND ADJUSTMENTS (See Figures 5-14 and 5-15) - The
location and function of the test points and adjustments on the Antenna Position Control Indicator are contained in Table
5-11.
(3) SCAN GENERATOR THEORY OF OPERATION (See Figure 5-16) The scan generator circuitry consists of a
scan generator circuit card, potentiometers R2, R3, and R4 on the Control Indicator, and a 6. 3-volt AC transformer on
the Antenna Position Power Supply. These components control the antenna for sector scanning. The scan generator
circuit card contains the circuitry which senses the antenna position as indicated by antenna position potentiometer R4,
amplifies the positioning voltage and allows reversing the direction of rotation of the azimuth servo drive while the
antenna is scanning.
a. Antenna position potentiometer R4 is coupled by magnetic clutch L3 to the shaft which rotates R4. Rotation of R4
varies a voltage representing the antenna position. When the clutch is deenergized, the wiper of R4 is centered by a
spring. With the clutch deenergized, the antenna is pointed ill the. direction to be scanned. To scan, the clutch is
energized and as the antenna turns, the voltage on the wiper of R4 is proportional to antenna position. Twenty-four volts
DC is applied to one side of R4 and to a two-to-one voltage divider formed by resistors R6, R11, R9 and R12. These
resistors form a bridge circuit on the scan generator circuit card. Sector width potentiometer R3 is connected between
the wiper of R4 and the center of the divider. A different: al amplifier on the scan generator circuit card, consisting of
transistors Q2 and Q3, senses the voltage difference between the voltage divider and the wiper of R3. Transistors Q1
and Q4 comprise two emitter-follower amplifiers which act as buffers for the differential amplifier formed by transistors
Q2 and Q3 against the loading of the differential amplifier formed by transistors Q5 and Q6.
b. Approximately 0. 15-volt difference between the bases of Q2 and Q3 drives the collectors of Q5 and Q6 to either
set or reset a flip-flop formed by transistors Q7 and Q8. When sector width potentiometer R3 is turned fully
counterclockwise, only a few degrees of movement of R4 is sufficient to develop the 0. 15-volt difference between the
bases of Q2 and Q3. When the wiper of R3 is rotated clockwise, it requires proportionately larger angles of rotation of
R4 to develop the 0. 15-volt difference between the bases of Q2 and Q3. Therefore, with R3 rotated fully
counterclockwise, the angle scanned will be small; that is, approximately 10 degrees. With the R3 rotated almost fully
clockwise, the width of the angle scanned is approximately +270 degrees.
Revised January 22, 1968
5-41
CE-1008
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
AR1, Elevation Servo Amplifier
AR2, Azimuth Servo Amplifier
P2, Azimuth Error Input Test Point
5, Elevation Slave/Follow-Up
G2, Elevation AC Servomotor
4, Elevation Manual/Scan Control Transmitter
Synchro Clamp (Typical, 3 per Synchro)
1, Azimuth Handwheel Clutch
2, Elevation Handwheel Clutch
3, Azimuth Manual/Scan Control Transmitter
G1, Azimuth AC Servomotor
1, Azimuth Slave/Follow-Up Control Transformer
P1, Elevation Error Input Test Point
AIR 8, Scan Generator Level Set Potentiometer
12648-028
Figure 5-14. Control Indicator, Antenna Position, Top View,
Location of Adjustments and Test Points
5-42
CE-1008
1.
2.
3.
4.
5.
6.
7.
R8, Cable 'Wrap Meter Max. Adj. Pot.
R7, Cable Wrap Meter Min. Adj. Pot.
R5, Beam Width Meter Min. Adj. Pot.
R6, Beam Width Meter Max. Adj. Pot.
R4, Antenna Position Potentiometer
L3, Scan Generator Clutch
S8, Sector Scan Limit Switch
12648-029
Figure 5-15. Control Indicator, Antenna Position, Bottom View,
Location of Adjustments and Test Points
5-43
CE-1008
Figure 5-16. Schematic, Scan Generator
5-45/5-46
CE- 1008
c. Diode switching is used to select one phase or the other from a 6. 3-volt center-tapped transformer
winding. Diodes CR8 and CR11 perform this function. When transistor 07 is turned on, one side of the 6. 3-volt
transformer winding is connected to ground by diode CR8. When transistor Q8 is turned on, the other side of the 6. 3volt transformer winding is connected to ground by diode CR11. Thus, the voltage at the centertap of the 6. 3-volt
transformer will reverse phase when Q7 and Q8 are alternately switched on. The voltage from the 6. 3-volt transformer
center tap is AC coupled by a capacitor Cl to scan control gain potentiometer R2.
d. The voltage picked up by the wiper of R2 is applied to azimuth servo amplifier AR2, as shown in
Figure 5-18, to control the speed at which a sector is scanned. The phase of this voltage controls the direction of the
servo motor rotation. A level-set potentiometer, A1R8, is provided on the scan generator circuit card for initial alignment
of the circuits to set the voltage level of the collectors of transistors Q5 and Q6 at approximately 8.5 volts. The voltage
on the collectors of transistors Q5 and Q6 should be balanced for zero volt difference. Balancing can be accomplished
by adjusting the voltage from R4 to set the voltage on the collector of Q6 to the same level as the voltage on the
collector of Q5. When this is done, the sector width can be selected by adjusting R3. When scan control gain
potentiometer R2 is set to scan at the desired speed, the antenna will scan the preset arc at the desired speed.
(4) CONTROL INDICATOR TRANSMISSION ASSEMBLY - Figure 5-17 illustrates the gearing ratios and
arrangement for the synchros, drive motors, handwheels, digital counters, and, in the case of azimuth, scan clutch L3,
sector scan limit switch S8, and antenna position potentiometer R4. This diagram is self-explanatory.
C. ALIGNMENT AND ADJUSTMENT PROCEDURES - The only alignment and adjustment procedures which are to
be performed on the Control Indicator when not connected into the system is adjusting the sector scan clutch and limit
switch and zeroing the synchros. Synchro zeroing procedures are contained in paragraph 2 of this section. Additional insystem adjustment procedures for the Control Indicator are contained in Section III of this manual.
(1) SCAN CLUTCH AND LIMIT SWITCH ADJUSTMENT
a. Manually rotate the azimuth and elevation gear trains until the TRUE AZIMUTH and TRUE ELEVATION
digital counters are at 0000.
b. Zero all synchros in accordance with the procedures set forth in paragraph 2 of this section.
Revised January 22, 1-" 8
5-47
CE-1008
Figure 5-17. Antenna Position Control Indicator, Gearing Diagram
5-48
CE- 1008
c. Remove the allen-head screws holding the sector scan clutch and potentiometer in position -and move
the assembly far enough to disengage the gears. Position the cam so that sector scan limit switch S8 is aligned with the
center of the cam lobe. Reengage the gears and secure the assembly to the transmission housing.
d. Connect an ohmmeter between the B and CW terminals of potentiometer R4.
e. Loosen the screws holding R4 in position and slowly rotate R4 until the ohmmeter indicates approximately
500 ohms. Secure R4 in position and remove the ohmmeter.
NOTE
R4 should be readjusted in accordance with the procedures set forth in Section m of this manual,
paragraph 5. A(4), when the system is operating.
f. Manually rotate the azimuth gear train CW (TRUE AZIMUTH counter increasing) 630 degrees. The
counter should indicate 270. 0.
g. Loosen sector scan limit stop switch S8 and rotate the gear train CCW 540 degrees. Observe that the
contacts of switch S8 again make between 90 and 60 degrees.
D. SCHEMATIC DIAGRAM AND PARTS LIST - The schematic diagram for the Antenna Position Control Indicator is
contained in Figure 5-18. The parts list for the Antenna Position Control Indicator is contained in Table 5-12.
14. ANTENNA CONTROL POWER SUPPLY
A. GENERAL - The unit is capable of supplying power, servo excitation, and azimuth orient correction factors for the
Antenna System. In addition, the unit provides the controls necessary to control power, pressure, and driving of the
radome-platform.
B. THEORY OF OPERATION - This subsection contains the theory of operation for the components within the
Power Supply. A detailed description of these components, as used in the system, is contained in paragraph 2, Section I,
of this manual. The theory of operation of the synchro devices used in the Power Supply is contained in paragraph 2 of
this section.
5-49
CE-1008
Figure 5-18. Schematic, Antenna Position Control Indicator
5-51/5-52
CE-1008
(1) FUNCTION OF OPERATING CONTROLS AND INDICATORS (See Figure 5-19)
a. ANTENNA SYSTEM POWER CIRCUIT BREAKER - The ANTENNA SYSTEMS-POWER circuit breaker,
CB3, controls application of the 120/208volt AC power to the Antenna System.
b. RADOME CONTROLS AND CIRCUIT BREAKERS - The radome controls and circuit breakers consist of:
CB1, RADOME POWER Circuit Breaker
M1, RADOME PRESSURE Meter
S1, DEICER Power Switch
S2, BLOWER Power Switch
DS1, PRESSURE SAFE Indicator Light
RADOME POWER (CB1) circuit breaker controls power application to the radome when the BLOWER (S2) power switch
is in the appropriate position. The DEICER (S1) power switch controls power to the deicers in the radome. When the
deicer is in operation, should radome pressure fall below 9 inches of water (approximately 0.35 psi) or the temperature in
the radome increase to 38 degrees Fahrenheit, pressure switches in the radome open, rendering the deicers inoperative.
c. SERVO EXCITATION CIRCUIT BREAKER- The SERVO EXCITATION circuit breaker (CB4) applies
primary power to the servo circuits in the Control Indicator and antenna pedestals.
d. WIND SPEED METER - The WIND SPEED meter (M2) indicates the local wind speed in mph. It is
connected to an anemometer mounted on a mast adjacent to the radome.
e. UTILITIES POWER - The UTILITIES circuit breaker (CB2) controls 115-vac power available at
convenience receptacles in the radome and on the tower.
f. AZIMUTH ORIENTATION - The AZ ORIENT control is used to set the true azimuth of the antenna
installation so that the TRUE AZIMUTH indicator on the Control Indicator unit will be correctly oriented for the site.
(2) LOCATION AND FUNCTION OF TEST POINTS AND ADJUSTMENTS (See Figure 5-20) - The location and
function of the test points and adjustments on the Antenna Control Power Supply are contained in Table 5-13.
C. ALIGNMENT AND ADJUSTMENT PROCEDURES - The only alignment and adjustment procedures which are to
be performed on the Power Supply when not connected into the system is zeroing the azimuth differential control
5-53
CE-1008
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
M1, Radome Pressure Meter
M2, Wind Speed Meter
CB4, Servo Excitation Circuit Breaker
CB2, Utilities Circuit Breaker
CB3, Antenna Systems Power Circuit Breaker
CB1, Radome Power Circuit Breaker
J6, Phone Jack
B1, B2, AZ Orient Control
S1, Deicer Switch
S2, Blower Switch
R7, Dimmer Control
DS1, Radome Indicator
12648-033
Figure 5-19. Power Supply - Antenna Control, Front Panel
Controls and Indicators
5.54
CE-1008
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
F1, 5A Fuse (L8V Unregulated)
F2, 3A Fuse (Remote Reference)
F3, 3A Fuse (Primary Power ∅A)
F4, 3A Fuse (Primary Power ∅B)
F5, 10A Fuse (Primary Power ∅C)
R1, +24 VDC Regulated Adjustment
TP3, +24 VDC Regulated Test Point
TP2, Ground Test Point
TPl, +28 VDC Unregulated Test Point
R3, Pressure Gauge M1 Min. Adj. Pot.
R6, Pressure Gauge M1 Max. Adj. Pot.
Synchro Clamps (Typical, 3 per Synchro)
B1, Differential Control Transmitter
12648-034
Figure 5-20. Power Supply, Antenna Control, Location of
Adjustments and Test Points
5-55
C-1008
transmitter synchros and resolver. These synchros should be zeroed n accordance with the procedures set forth in
paragraph 2 of this section.
D. SCHEMATIC DIAGRAM AND PARTS LIST - The schematic diagram for the Antenna Control Power Supply is
contained in Figure 5-21. The parts list is contained in Table 5-14.
15. DIRECTION FINDING DISPLAY SCOPE
A. GENERAL - The scope displays the antenna pattern in azimuth and is used for indicating the azimuth direction of
a received signal. Append I contains complete instructions applicable to the basic scope. Some modifications have
been added to the scope; they are described below.
B. DESCRIPTION OF MODIFICATIONS -The modifications added to the basic scope are shown in Figure 5-22.
This consists of the addition of four circuit cards and some interconnection wiring. The circuit cards are a modulator, two
demodulators. and a writing gun relay driver.
(1) Inputs to the scope are the AGC signal from the associated receiver and the resolver reference voltage. The
modulator produces a square wave output with amplitude proportional to the magnitude of the AGC signal (which in turn
is proportional to signal strength) and in phase with the resolver reference voltage.
(2) The resolver block is actually two resolvers, one in the Pedestal and one in the Antenna Control Power
Supply. The resolver in the pedestal is geared to antenna azimuth direction and is corrected for boresighting errors b)y
the AZ ORIENT resolver in the power supply. The two resolver outputs are proportional to the sine and cosine of the true
azimuth angle. These AC signals are demodulated to DC and applied to the X and Y deflection amplifiers of the scope.
(3) To avoid damaging the scope face with a spot burn when no signal is present, the writing gun is kept off until
a signal is present. The writing gun relay driver is adjusted to energize the WRITE-DON'T WRITE relay at an AGC level
just above zero signal level. When the relay is energized, the writing gun is enabled.
(4) Interconnection wiring changes are shown in Figure 5-23. The circuit boards are described in greater detail in
the following paragraphs.
5-56
CE-1008
Figure 5-21. Schematic, Power Supply - Antenna Control
5-57/5-58
CE- 1008
Figure 5-22. Scope Modifications Block Diagram
5-59
CE-1008
Figure 5-23. Scope Wiring Modifications
5-60
CE- 1008
C. MODULATOR CIRCUIT BOARD See Figure 5-24)
(1) The modulator produces a square wave output signal whose amplitude is proportional to the magnitude of the
receiver AGC signal. It consists of two operational amplifiers, a 60-cps reference generator, and an output amplifier.
(2) The AGC signal is applied through pin 34 to operational amplifier A1. A 115-volt, 60-cps resolver reference
signal is applied through pins 2 and 6 to transformer T1. The output winding of T1 controls transistors Q2 and Q4 which
in turn switch Q1 and Q3 at a 400-cps rate. Thus the output of Al is a 60-cps square wave proportional to the AGC signal
in amplitude. This signal is further amplified by operational amplifier A2 and output amplifiers Q5 and Q6.
(3) PARTS LIST AND SCHEMATIC - The parts list for the modulator is contained in Table 5-15. The schematic
diagram is shown in Figure 5-24.
D. DEMODULATOR CIRCUIT BOARD (See Figure 5-25)
(1) The demodulator is a dual-purpose card. It provides a full-wave phase sensitive demodulator and an
operational amplifier for compensation. The demodulator consists of two transistor switches Q1 and Q2. Q1 and Q2
switch the inputs alternately to ground. Q1 and Q2 are caused to switch by the reference generator Q3 and Q4. Al is a
high gain operational amplifier which provides an integration. Amplifier current balance is provided by BAL control R10.
(2) PARTS LIST AND SCHEMATIC - The parts list for the demodulator is contained in Table 5-16.
schematic diagram is shown in Figure 5-25.
The
E. WRITING GUN RELAY DRIVER (See Figure 5-26)
(1) The writing gun relay driver controls operation of the scope writing gun so that a scope display will be present
only when a signal is being received. The circuit card consists of an operational amplifier, a transistorized relay driver
and a relay.
(2) The AGC signal from the receiver is applied to pin 3 and TP2. This signal is amplified by amplifier Al and,
when of sufficient magnitude, triggers relay driver Q1 to the ON condition. When Q1 is on, a ground path is completed
for the coil of relay K1 which is energized, applying +15V to pin 30 and enabling the writing gun in the scope to operate.
When K1 is deenergized, a ground is applied to pin 30 and the writing gun is disabled.
(3) ADJUSTMENTS - Set LEVEL control R8 so that relay K1 is energized at an AGC voltage just above zero
signal level. This control setting will vary
Revised January 22, 1968
5-61
CE-1008
Figure 5-24. Modulator Schematic Diagram
5-62
CE-1008
Figure 5-25. Demodulator Schematic Diagram
5-63
CE-1008
Figure 5-26. Writing Gun Relay Driver Schematic Diagram
5-65/5-66
CE- 1008
with the receiver in use. The circuit card will operate over a wide range of AGC voltage; however, the object is to have
the writing gun operate only when a signal is present.
(4) PARTS LIST AND SCHEMATIC - The parts list for the Writing Gun Relay Driver is contained in Table 5-17.
The schematic diagram is shown in Figure 5-26.
5-67
CE-1008
TABLE 5-1. ANTENNA SYSTEM, MAJOR COMPONENTS PARTS LIST
Figure
Ref.
5-1
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
Ref.
Desig.
Air Force
Part Number
Description
Antenna System (See Table 5-2)
Guy, Radome Ground
Installation
Stand, Portable (See Table 5-8)
Lightning Rod, Ground
Rod
Rod
Rod
Rod
Rod
Rod
Wire Rope Assembly
Drive Tool
Lightning Rod, Tower
Rod
Rod
Rod
Rod
Rod
Rod
Ground Rod Assembly
Guy, Radome, 80-Foot
Tower Installation
Hoist, Elevation Drive
(See Table 5-9)
Cover Assembly, Hard
5-68
Fed. Standard
Part Number
Commercial
Part Number
Qty
Per
Unit
Mfr.
728906
728663-3
98825
98825
1
4
728952
728673-3
MS-54
MS-53
MS-52
MS-51
MS-50
MS-49
728680
728685
728698
MS-54
MS-53
MS-52
MS-51
MS-50
MS-49
728701
728753
98825
98825
97540
97540
97540
97540
97540
97540
98825
98825
98825
97540
97540
97540
97540
97540
97540
98825
98825
1
1
1
4
1
1
1
1
3
1
1
1
4
1
1
1
1
1
4
728833
98825 1
728976
98825 1
CE-1008
TABLE 5-1. ANTENNA SYSTEM, MAJOR COMPONENTS PARTS LIST (CONT)
Figure
Ref.
5-1
- 12
-13
-14
-15
-16
-17
-18
-19
-20
-21
-22
Ref.
Desig.
Air Force
Part Number
Description
Mounting Assembly,
Anemometer
Washer, Flat; CRES,
3/4-Inch
Screw, Cap, Hex Head; CRES,
3/4- l(x4. 00 Inch Lg
Washer, Lock, Split; CRES,
3/4-Inch
Washer, Flat; CRES, 1/4
Washer, Lock, Split; CRES,
1/4
Screw, Cap, Socket Head;
1/4- 20x 1. 00 Inch Lg
Tower Assembly, 80-Foot
Anemometer Mounting
Assembly, Tower
Adapter, Mast
Transmitter, Wind Speed
Fed. Standard
Part Number
Commercial
Part Number
728977
5-69
Mfr.
98825
Qty
Per
Unit
1
MS15795-322
4
MS35307-495
4
MS35338-89
4
MS15795-810
MS35338-52
6
6
MS16995-52
6
L-1686
728988
88900
98825
1
1
515333
Model 122
23667
23667
1
1
CE-1008
TABLE 5-2. ANTENNA SYSTEM, PARTS LIST
Figure
Ref.
5-2
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
Ref.
Desig.
Air Force
Part Number
Description
Radome-Platform, Type I
Cable Assy, Elevation Data
Counterweight
Reflector, 9-Foot Diameter
Antenna, Log-Periodic
Clip
Extension, Support
Support, Elevation Drive
Assembly
Adapter
Pedestal, Antenna
(See Table 5-3)
Support Assembly
Bracket
Polarization Diversity
Mechanism (See Table 5-5)
Bracket
Clamp, 9-Foot Antenna
Washer, Tapered
Actuator, Electromechanical
Linear (See Table 5-6)
Socket, 8-Point, 1/4-Inch,
1/4 Drive
Extension Bar, 1/4 Drive
Wrench, Speeder, 1/4 Drive
Fed. Standard
Part Number
Commercial
Part Number
Mfr.
6009-18A
728574
728599
98825
98825
98825
72171
91506
98825
98825
1
1
2
1
1
2
1
1
728603
728733-5
98825
98825
1
1
728710
728600
728920
98825
98825
98825
3
1
1
728605
728624
728650
728542-1
98825
98825
98825
98825
1
4
3
1
4708-S
93389
1
TM-2
TM-4A
55719
55719
1
1
728937-2
728794
728901
5-70
Qty
Per
Unit
CE-1008
TABLE 5-2. ANTENNA SYSTEM, PARTS LIST (CONT)
Figure
Ref.
5-2
-21
-22
-23
-24
-25
-26
-27
-28
-29
-30
-31
-32
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Drive Assembly, Elevation
(See Table 5-7)
Support, Counterweight
Sealant, Rubber, Silicone
Level Bubble
Screw, Machine, Pan Head;
CRES, #2-56x3/4 Inch Lg
Screw, Machine, Flat Head;
CRES #10-32x1/2 Inch Lg
Screw, Machine, Fillister
Head; CRES #6-32x1-1/4
Inch Lg
Auxiliary Pedestal Support
Screw, Cap, Socket Head;
CRES # 10-32x3/4 Inch Lg
Screw, Cap, Socket Head;
CRES 1/4-20x1/4 Inch Lg
Screw, Shoulder, Socket
Heat; (E 10-24) Steel Cad
Plate, 1/4x3/4 Inch Lg
Screw, Cap, Socket Head,
CRES, 3/8-16x2-1/4 Inch Lg
Commercial
Part Number
Mfr.
728910
98825
1
728622
RTV-731
98825
71984
2
AR
1986G
57163
MS35233-9
2
4
MS35250-72
6
MS35275-35
4
728888-1
5-71
Qty
Per
Unit
MS16996-12
2
13
MS16995-53
8
MS16638-4
6
MS16995-86
12
CE-1008
TABLE 5-2. ANTENNA SYSTEM, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Commercial
Part Number
Qty
Per
Unit
Mfr.
5-2
-33
-34
-35
-36
-37
-38
-39
-40
-41
-42
-43
-44
-45
Screw, Cap. Socket Head;
CRES, 1/2-13x 1-1/4 Inch Lg
Screw, Cap, Socket Head;
CRES, 1/2-13x2-1/4 Inch Lg
Screw, Cap, Hex Head; CRES,
3/8-16x 1-1/4 Inch Lg
Screw, Cap, Hex Head; CRES,
3/8-16x4-1/2 Inch Lg
Screw, Cap, Hex Head; CRES,
1/2-20x2-1/4 Inch Lg
Setscrew, Cup Point, Steel,
Cad Plate, 5/16-18-1/4
Inch Lg
Screw, Cap,. Socket Head;
CRES, #10-32x1/2 Inch Lg
Pin, Spring, CRES 1/16 Dia
x 3/4 Inch Lg
Washer, Lock, Split, CRES
#10
Washer, Lock, Split,
CRES 1/4
Washer, Lock, Split
Washer, Lock, Split,
CRES 1/2
Screw, Cap, Socket Head,
CRES # 10-32x7/8 Inch Lg
5-72
MS16995-95
12
MS16995-99
7
MS35307-62
8
MS35307-76
4
MS35308-116
6
MS51017-90
2
MS16996-10
2
MS16562-198
3
MS35338-81
38
MS35338-82
8
MS35338-84
MS35338-86
24
28
MS16996-13
1
CE-1008
TABLE 5-2. ANTENNA SYSTEM, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
5-2
-46
-47
-48
-49
-50
-51
-52
-53
-54
-55
-56
-57
-58
-59
-60
-61
-62
-63
|
Air Force
Part Number
Description
Cable Clamp
Washer, Flat; CRES 3/8
Washer, Flat; CRES #6
Washer, Flat; CRES #10
Washer, Flat; CRES 1/4
Washer, Flat; CRES 3/8
Washer, Flat; CRES 1/2
Washer, Flat; CRES 5/16
Nut, Plain, Hex; CRES
#10-32
Nut, Plain, Hex (JAM);
CRES 5/16-18
Nut, Plain, Hex; CRES
#6-32
Nut, Plain, Hex; CRES
#10-24
Nut .t, Plain, Hex; CRES
3/8-16
Nut, Plain, Hex; CRES
1/2-13
Support, Cable Clamp
Assembly
Bracket, Cable Clamp
Spacer Clip, Mounting
Nut., Plain, Hex; CRES
#2-56
Fed. Standard
Part Number
Commercial
Part Number
728821
Mfr.
98825
AN960C616
MS15795-305
MS15795-308
MS15795-310
MS15795-314
MS15795-318
MS15795-312
MS35650-104
o
MS35691-510
1
5-73
Qty
Per
Unit
1
24
4
52
14
16
35
2
18
2
MS35649-64
12
MS35649-104
6
MS35690-610
16
MS35690-810
13
MS35649- 24
728965
98825
1
728834-1
728817
98825
98825
1
2
4
CE-1008
TABLE 5-2. ANTENNA SYSTEM, PARTS LIST (CONT)
Figure
Ref.
5-2
-64
-65
-66
-67
-68
-69
-70
-71
-72
-73
-74
-75
-76
Ref.
Desig.
Air Force
Part Number
Description
Washer, Lock, Split;
CRES #2
Washer, Flat: CRES # 2
Bracket, Cable Clamp
Cable Assembly, Radio
Frequency, 9-Foot Dish
Cable Assembly, Mixer
Switching Units
Cable Assembly, Radio
Frequency, 9-Foot Dish
Cable Clamp
Spiral Wrap
Support, Split
-Washer, Sealing
Test Probe Assembly
Pressure Transducer,
0-1 PSID Range
Pressure
Transducer
Screw Machine, Pan Head;
#10-32x 7/8 in. lg
Fed. Standard
Part Number
Commercial
Part Number
Mfr.
MS35338-77
4
MS15795-302
MS51958-66
5-74
Qty
Per
Unit
728863
728726
98825
98825
4
1
1
728453
98825
2
728727
98825
1
SWN-3/8
84971
05593
1
AR
2230-8
728454
2010-1PD-10
98159
98825
27151
1
1
1
728997
98825
1
14
CE-1008
TABLE 5-3. ANTENNA PEDESTAL, PARTS LIST
Figure
Ref.
5-6
Ref.
Desig.
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
C1
C3
C4
K1
R1
Air Force
Part Number
Description
Drive Assembly, Azimuth
See Table 5-4)
Gasket Azimuth Drive
Cover Access, Synchro
Cover, Access, Motor
Control
Cover, Access, Motor
Deleted
Base, Riser, Azimuth Drive
Packing "O" Ring
Plate, Unit Identification
Control, Motor, No. 2
Capacitor, 15 µf, 600 VDC
Capacitor, 2 µf, 600 VDC,
MIL-C- 25/7
Capacitor, 4 µf, 600 VDC,
MIL -C-25/7
Relay
R2
Resistor, 10Ω, 10W,
MIL-R- 18546/1
Resistor, WW, 50W
R3
R4
Same as R1
Same as R2
Fed. Standard
Part Number
Commercial
Part Number
Mfr.
728615-1
98825
1
728702
728690-5
728690-1
98825
98825
98825
1
1
1
728691
98825
1
728675-7
98825
728919-7
728739-1
331P3U
98825
98825
96733
1
3
1
1
3
1
AN6227-3
CP70BIEF205K1
CP70BIEF405K1
09026
RE65G1R00
1
2
91637 2
5-75
Qty
Per
Unit
1
CE-1008
TABLE 5-3. ANTENNA PEDESTAL, PARTS LIST (CONT)
Figure
Ref.
5-6
-10
Ref.
Desig.
-11
-12
-13
-14
-15
-16
-17
-18
-19
Description
R5
Resistor, WW, 50W
R6
TB1
Same as R5
Terminal Strip 10Terminal
Same as TB1
Same as TB1
Control, Motor, No. 1
Amplifier
TB2
'i'B3
Air Force
Part Number
Filter, Radio Interference
Capacitor, 0. 47 µf,
200 VDC
RF Filter
Resistor, 2.2K, 1/2W, 5%.
MIL-R-11/3
Capacitor, 1.5 if, 200 VDC
Clip
Stat-O-Seal #8
Screw, Leveling
Label, Pressure Sensitive
Ratchet Wrench, 1/4-Inch
Drive
Socket, 8-Point, 1/4-Inch
"D" Washer
Deleted
Fed. Standard
Part Number
Commercial
Part Number
Mfr.
RH-50, 200
±3%g
91637
2
10-140
71785
3
728741-1
A539-250C13B6-A
GF-2967
12M2474-DG
98825
1
2
07294
96733
2
2
GF-3410
07294
4
1
44M2155-DG
6008-2A
600-001-8
728793
728765
4749
96733
91506
83259
98825
98825
93389
1
1
1
4
3
1
4708-S
D-191
93389
95987
1
3
RC20GF222J
3
5-76
Qty
Per
Unit
CE-1008
TABLE 5-3. ANTENNA PEDESTAL, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
Description
5-6
-20
-21
-22
"D" Washer
Solder, QQ-S-571
Gasket
-23
Gasket
-24
Gasket
-25
Gasket
-26
Sealing Compound, Ret,
MIL-S-22473 CL30
Nut, Plain, Hex; CRES
#4-40 UNC
Nut, Plain, Hex; CRES
#8-32 UNC
Nut, Plain, Hex; CRES
5/8-11 UNC
Washer, Flat; CRES #4
Washer, Flat; CRES #8
Washer, Flat; CRES #10
Washer, Flat; CRES 5/8
Screw, Machine, Pan Head,
CRES #8-32 UNC x 3/4
Inch Lg
Washer, Lock, Split;
CRES #4
-27
-28
-29
-30
-31
-32
-33
-34
-35
Air Force
Part Number
Fed. Standard
Part Number
Commercial
Part Number
Mfr.
D- 167
95987
10-10194918
10-10194920
10-10194922
10-4045036
77820
5
AR
1
77820
1
77820
1
77820
1
SN60WARP2
5-77
Qty
Per
Unit
E Grade
AR
MS35649-44
12
MS35649-84
8
MS35690-1010
4
MS15795-303
MS15795-307
MS15795-308
MS15795-320
MS35233-47
24
12
3
12
4
MS35338-78
12
CE-1008
TABLE 5-3. ANTENNA PEDESTAL, PARTS LIST (CONT)
Figure
Ref.
5-6
-36
-37
-38
-39
-40
-41
-42
-43
-44
-45
Ref.
Desig.
Air Force
Part Number
Description
Washer, Lock, Split,
CRES # 10
Washer, Lock, Split.
CRES 5/8
Washer, Lock, Split,
CRES #8
Screw, Cap, Hex Head,
CRES 5/8-11 UNC x
3-1/4 Inch Lg
Nut, Plain, Hex (JAM),
CRES 5/8-11 UNC
Screw, Cap, Socket Head,
CRES # 10-32 UNF x 5//8
Inch Lg
Screw, Cap, Socket Head,
CRES #10-32 UNF x 5/8
Inch Lg
Screw, Machine, Pan Head,
CRES #8-32 UNC x 7-1/8
inch Lg
Screw, Machine, Pan Head,
CRES #2-56 UNC x 3/16
inch Lg
Screw, Machine, Pan Head,
CRES #4-40 UNC x 1/2
Inch Lg
5-78
Fed. Standard
Part Number
Commercial
Part Number
Qty
Per
Unit
Mfr.
MS35338-8 1
8
MS35338-88
4
MS35338-80
8
MS35307-169
4
MS35691-1010
4
MS16996-11
5
MS16996-12
3
MS35233-48
1
MS35233-2
2
MS35233-17
8
CE-1008
TABLE 5-3. ANTENNA PEDESTAL, PARTS LIST (CONT)
Figure
Ref.
5-6
-46
Ref.
Desig.
Description
-48
Screw, Machine, Pan Head,
CRES #8-32 UNC x 5/8
Inch Lg
Screw, Drive #4 x 3/16 Inch
Lg Steel Cad Plate
Cable Clamp
-49
-47
Air Force
Part Number
Fed. Standard
Part Number
Commercial
Part Number
Mfr.
Qty
Per
Unit
MS35233-46
3
MS21318-20
4
3/4-6
95987
1
Cable Clamp
7/16-6
95987
2
-50
Cable Clamp
1/2-6
95987
2
-51
Cable Clamp
7/8-6
95987
2
-52
Receptacle
-53
Receptacle
-54
Receptacle
-55
Receptacle
-56
Switch
-57
Plug
-58
Dust Cap
-59
Protection Cap
-60
Protection Cap
MS3112E1811S
MS3112E2016S
MS3112E2255S
MS3102R367P
MS24524-23
1
1
1
1
1
PT06E-1419S(SR
77820
MS25D43-36C
1
10-101960183
10-101960203
5-79
2
77820
1
77820
1
CE-1008
TABLE 5-3. ANTENNA PEDESTAL, PARTS LIST (CONT)
Figure
Ref.
5-6
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Commercial
Part Number
77820
1
-61
Protection Cap
-62
Deleted
-63
-64
Screw, Round Head, Sit
CRES 4-40 UNC x 1/2
Inch Lg
Deleted
-65
Deleted
-66
Base, Riser, Azimuth Drive
-67
Bolt, Eye, Special
-68
Washer, Split Lock, CRES
1/2
Washer, Flat, CRES 1/2
MS35338-86
4
AN960C816
4
Nut, Hex, Plain, CRES
1/2-13 UNC
Guy, Pedestal Support
MS35690-810
4
-69
-70
-71
10-101960223
Mfr.
Qty
Per
Unit
4N515-4-8
4
728675-7
98825
1
728889
98825
4
728905
5-80
98825
2
CE-1008
TABLE 5-4. AZIMUTH DRIVE ASSEMBLY, PARTS LIST
Figure
Ref.
Commercial
Part Number
728597
Mfr.
98825
Qty
Per
Unit
1
Shaft
728596
98825
1
Cone, Class 3
29675
60038
1
Cup, Class 3
29620
60038
2
Ring
728638
98825
2
9-1004-31
15840
10
Cone, Class 3
29680
60038
1
Spacer, Azimuth
728786
98825
1
Bearing, ABEC-1
303SZZG
38443
2
Gearshaft
728582
98825
1
Gear
728583
98825
1
Gear, Spur
728579
98825
1
Limit Stop Assembly
728652
98825
1
Ring, Collector
728618
98825
1
Ring, Collector
728617
98825
1
Seal
53X3355
08479
1
Dial
728674
98825
1
Gasket
728704
98825
1
DB-3516
49367
1
Brake, NEMA C Flange, 7/16 Bore, 3/32 Sq Key
728941
05805
1
Motor
728762
98825
1
Gearshaft
728581
98825
1
201SZZG
38443
4
728580
98825
1
Ref.
Desig.
Air Force
Part Number
Description
Housing
Spring
Sealing Grip
Bearing, ABEC-1.
Gearshaft
5-81
Fed. Standard
Part Number
CE-1008
TABLE 5-4. AZIMUTH DRIVE ASSEMBLY, PARTS LIST (CONT)
Figure
Ref.
Commercial
Part Number
728639-1
Mfr.
98825
Qty
Per
Unit
1
Synchro., Control Transformer -
23CT6
97497
1
Synchro, Torque Transmitter -
23TX6
97497
1
Overtravel Switch
727235
98825
1
Gear Cluster
728671
98825
1
Clam-Synchro
C 12
00328
8
Clamp-Cable
1/2-3
95987
1
Shaft
728641
98825
1
Bearing, ABEC-5
SFR4SS
70854
1
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Synchro Assembly
Retaining Ring
MS16624-4025
1
Retaining Ring
MS16624-4037
1
Bearing, ABEC-5
SFR6FF
70854
1
Shaft Extension
AU-3
00141
1
251-195/
SHA. 2500
AB150-231/
CT. 250
AB250-126/
CT. 250
SC-313
01351
1
01351
1
01351
2
01351
5
Gear
Gear
Gear
Clamp-Gear
Pin, Spring, CRES, 1/16 Dia x 1/8 Inch Lg
79-012-062125
Set Screw, CRES, 6-32 x 3/16
MS51029-17
5-82
3
1
CE-1008
TABLE 5-4. AZIMUTH DRIVE ASSEMBLY, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
Air Force
Part Number
Description
Pin, Spring, CRES, 1/16 Dia x 9/16 Inch Lg
Resolver
Capacitor, 0.47 µf, 200 VDC
Indicator, Azimuth +180°
5-83
Fed. Standard
Part Number
MS16562-195
Commercial
Part Number
Mfr.
Qty
Per
Unit
1
VRE23-6H2
97497
1
12M2474-DG
96733
1
728846
98825
1
CE-1008
TABLE 5-5. POLARIZATION DIVERSITY MECHANISM
Figure
Ref.
Spacer, Stepped
Commercial
Part Number
728566
Mfr.
98825
Qty
Per
Unit
1
Drive, Polarizer
728543
98825
1
Shaft, Polarizer
728584
98825
1
Washer, Flat
728570
98825
1
Cam. Control
728569
98825
1
Spacer, Sleeve
728567
98825
1
Washer, Laminated
728585
98825
2 max
Ref.
Desig.
Air Force
Part Number
Description
Connector
Fed. Standard
Part Number
MS3114E-1419P
MS3114E-8-4S
Connector
1
1
Bearing
200-SZZ
38443
1
Bearing
202-SZZ
38443
1
Switch, Sub Min
1SM1-T
91929
8
JS-51
91929
1
RHM-25
30Ω, 3%
91637
1
Roller Leaf
Resistor, 25W
5-84
CE-1008
TABLE 5-6. ELECTROMECHANICAL LINEAR ACTUATOR, PARTS LIST
Figure
Ref.
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Actuator, Linear
Connector
Commercial
Part Number
728542-1
Mfr.
98825
MS3106R-181P
Qty
Per
Unit
1
1
Flange, Mounting
728542-3
98825
1
Flange, Mounting
728542-5
98825
1
Connector
1
Pin, Straight
MS3106R-181P
MS16555-32
Pin, Straight
MS16555-650
1
Label, Unit Identification
1
728918-1
5-85
1
CE-1008
TABLE 5-7. ELEVATION DRIVE ASSEMBLY, PARTS LIST
Figure
Ref.
5-11
Ref.
Desig.
Description
Air Force
Part Number
Fed. Standard
Part Number
Commercial
Part Number
Qty
Per
Unit
Mfr.
B1
Motor, Synchro
23TX6
97497
1
B2
Motor, Synchro
23CT6
97497
1
B3
Motor, Elevation Drive
728761
98825
1
C1
Capacitor, 1.5 µf, 200 VDC
44M2155-DG
96733
1
C2
Capacitor, 0 47 µf, 200 VDC
12M2474-DG
96733
I
L1
Brake, NEMA “C" Flange
728940
98825
1
MG1
Same as B3
S1
Switch
BZE6-2RN2
74059
1
Shaft, Elevation Drive
728627
98825
1
Dial. Index Pointer
728637
98825
1
Bumper, Limit Stop
728662
98825
2
Gearshaft, Spur
728634
98825
1
Gearshaft, Spur
728632
98825
1
Gearshaft, Spur
728629
98825
1
Clamp, Synchro
C 12
10123
6
Clamp, Synchro
C2
10123
3
Bearing, ABEC-5
SFR6FF
70854
2
Bearing, ABEC-1
201SZZG
38443
2
Bearing, ABEC- 1
203SZZG
38443
2
Cone, Bearing, Class 3
29680
60038
1
Cup, Bearing, Class 3
29620
60038
2
Cone, Bearing, Class 3
29675
60038
1
Dial
65DRR14CC
08674
1
Seal
63X 1471
08479
1
Seal
71X6304
08479
2
Clamp, Gear
YC21A-1S
12444
a
5-86
CE-1008
TABLE 5-7. ELEVATION DRIVE ASSEMBLY, PARTS LIST (CONT)
Figure
Ref.
5-11
Commercial
Part Number
Mfr.
Qty
Per
Unit
ACM2405-84
12444
2
728657
98825
2
72962
2
Cable Clamp, 3/8-6
79-012-062125
3/8-6
95987
1
Cable Clamp, 9/16-6
9/16-6
96987
1
PT06E 1419S(SR)
77820
1
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Gear, Antibacklash
Limit Stop Assembly
Pin, Spring, CRES, 1/16 Dia x 1/8 Inch Lg
Plug
Plug
MS3101R- 181S
MS3112E2255P
Connector
Clamp, Cable, CRES
1
1
TA716SS13
5-87
84971
1
CE-1008
TABLE 5-8. PORTABLE STAND AND HOIST, PARTS LIST
Figure
Ref.
Commercial
Part Number
728667
Mfr.
98825
Qty
Per
Unit
4
728957-11
98825
8
728950
98825
8
728957-12
98825
4
Plate, Base
728943
98825
4
Brace, Horizontal, Bottom
728960
98823
4
Support, Vertical
728947
98825
1
Brace, Horizontal, Top
728961
98825
1
Winch Assembly
728959
98825
4
T-Bar Assembly
728946
98825
4
Box Support
728951
98825
4
Knee, Box Support
728962
98825
4
Tie Rod, Adjustable
728957-13
98825
8
728963
98825
1
Ref.
Desig.
Air Force
Part Number
Description
Screw, Special
Tie Rod, Adjustable
Tie Rod, Outrigger Support
Tie Rod, Adjustable
Cable Assembly
5-88
Fed. Standard
Part Number
CE-1008
TABLE 5-9. ELEVATION DRIVE ASSEMBLY HOIST, PARTS LIST
Figure
Ref.
Winch, Drum
Commercial
Part Number
728646
Mfr.
98825
Qty
Per
Unit
1
Hoist, Section
728826
98825
1
Tube, Hoist
728887
98825
1
Support
728828
98825
1
Bracket, Pulley
728829
98825
2
Clamp
728830
98825
2
Wire Rope Assembly
728835
98825
1
Support Arm
729890
98825
1
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Washer, Lock, Split; CRES, 5/16 Nom.
MS35338-83
2
Screw, Cap, Hex Head; CRES, 1/4-20 NC x 2-1/2
MS35307-16
4
Washer, Flat, Round; CRES, 1/4 Nom.
MS15795-310
6
Washer, Lock, Split; CRES, 1/4 Nom.
MS35338-82
4
Nut, Plain, Hex (Jam); CRES, 1/4-20 NC
MS35691-410
6
Washer, Flat, Round; CRES, 1/4 Nom.
MS15795-311
2
Screw, Shoulder; Steel(5/16), 1/4-20x2-7/6 Inch Lg
MS16638-15
2
Washer, Flat; CRES, 5/16 Norm.
MS15799-312
4
Sheave; Steel
2011
5-89
2
CE-1008
TABLE 5-9. ELEVATION DRIVE ASSEMBLY HOIST, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
Description
Clamp, Wire Rope: Steel Cad Plate, 1/8 Dia x1-3/4 Lg
Wire Rope Thimble; Steel Galv. 1/8 Dia x 1-3/4 Lg
Anchor Shackle; Steel Galv, 1/2 Dia Pin
5-90
Air Force
Part Number
Fed. Standard
Part Number
Commercial
Part Number
1/8 Dia
Mfr.
75535
Qty
Per
Unit
1
#323 1/8 Dia
79577
1
#290, Size
7/16
79577
1
CE-1008
TABLE 5-10. 80-FOOT TOWER, PARTS LIST
Figure
Ref.
2-4
Tower Section
Commercial
Part Number
L-1686-1
Mfr.
88900
Qty
Per
Unit
10
Base Section
L-1686-2
88900
1
Restrainer Brace
L-1686-3
88900
40
Leg Assembly
L- 1686-4
88900
4
Base Plate Assembly
L-1686-5
88900
4
Ladder
L-1686-6
88900
10
Horizontal Cable Brace
L-1686-7
88900
18
75-Foot Guy Assembly
L-1686-8
88900
4
90-Foot Guy Assembly
L-1686-9
88900
4
155-Foot Wire Rope Assembly (Anti-twist)
L-1686-10
88900
8
Spacer
L-1686-11
88900
4
Box Lifting Davit
L-1686-12
88900
4
Box Lifting Winch Assembly
L-1686-13
88900
4
Outboard Support
L-1686-14
88900
4
Grip-Strut Platform
L-1686-15
88900
4
Box Support
L-1686-16
88900
4
Maintenance Hoist
L-1686-17
88900
1
Nylon Rope Assembly
L-1686-18
88900
1
Nylon Rope Assembly
L-1686-19
88900
1
Restrainer Brace
L-1686-23
88900
40
Anchor
2047
88900
12
Guy Lug
2080
88900
8
Clevis
2394
88900
16
Guy Winch
2480
88900
8
Ground Rod
J8336
91824
4
Ref.
Desig.
Air Force
Part Number
Description
5-91
Fed. Standard
Part Number
CE-1008
TABLE 5-10. 80-FOOT TOWER, PARTS LIST (CONT)
Figure
Ref.
2-4
Ref.
Desig.
Air Force
Part Number
Description
Grounding Wire, Copper NO. 6 x 25 ft lg
Grounding Wire Clamp
5-92
Fed. Standard
Part Number
Commercial
Part Number
— — —
Mfr.
— — —
Qty
Per
Unit
4
J8492
91824
4
CE-1008
TABLE 5-11. ANTENNA POSITION CONTROL INDICATOR, LOCATION
AND FUNCTION OF TEST POINTS AND ADJUSTMENTS
Figure
Ref.
Test Point or
Adjustment
TP2, Azimuth Error
Input
Function
Test point for checking the azimuth slave or manual error
input to azimuth servo amplifier AR2.
TP1, Elevation Error
Input
Test point for checking the elevation error input to
elevation servo amplifier AR1.
A1R8, Scan Generator
Level Set Potentiometer
Adjustment for setting the range around which the
antenna will sector scan.
R8, Cable Wrap Meter
Max. Adj. Pot.
Allows adjustment of the maximum deflection of the
needle on CABLE WRAP meter M1.
R7, Cable Wrap Meter
Min. Adj. Pot.
Allows adjustment of the minimum deflection of the
needle on CABLE WRAP meter M1.
R5, Beam Width Meter
Min. Adj. Pot.
Allows adjustment of the minimum deflection of the
needle on the BEAM WIDTH meter M2.
R6, Beam Width Meter
Max. Adj. Pot.
Allows adjustment of the maximum deflection of the
needle on BEAM WIDTH meter M2.
R4, Antenna Position
Potentiometer
Establishes the center position of the angle to be scanned
during sector scan operation.
S8, Sector Scan Limit
Switch
Limits sector scan to ± 270 degrees.
5-93
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST
Figure
Ref.
Ref.
Desig.
R4
Commercial
Part Number
728925
Mfr.
98825
Qty
Per
Unit
1
Clamp
728551
98825
3
Shaft, Ctr DR (R.H.)
728553
98825
1
Shaft, Intermediate
728554
98825
7
Control
728594
98825
1
Shaft Extension
728613
98825
1
Coupling
728608
98825
1
Spring, Helical Torque
728595
98825
1
Gear, Hubless
728616
98825
1
Setscrew, Special; CRES #6-32
728601
98825
1
Cam
728815
98825
1
Clamp
YC5- IS
12444
3
Clamp
YC 12-1S
12444
3
Clutch
C-28-1
06315
1
Model 100
02111
1
Terminal Strip
2-141
71735
1
Angle Counter
1503
99479
2
Magnetic Clutch
F-24
08699
2
Motor-Generator
728778
98825
2
Synchro, Control Transmitter
23CX6
97497
2
Synchro, Control Transformer
23CT6
97497
2
Bearing
SFR4SS
70854
4
Bearing
SFR3SS
70854
14
Air Force
Part Number
Description
Transmission Assembly
Fed. Standard
Part Number
Potentiometer, 1000
Ring, Retaining, 1/4 x 0.025
MS16624-4025
5-94
2
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
Commercial
Part Number
Mfr.
Qty
Per
Unit
14
Clamp
YC5-2S
12444
12
Clamp
C75
57533
4
Clamp
YC20A- 1S
12444
2
Clamp
YC21A- 1S
12444
8
Clamp
YC5-4S
12444
11
Air Force
Part Number
Description
Ring, Retaining, 3/16 x 0.015
Ring, Retaining, Bowed 1/4 x 0.025
Fed. Standard
Part Number
MS16624-1018
MS16628-4025
Gear, Bevel (Set)
N1-1-S-C
12139
2
Gear, Spur
H28-60
12139
2
Gear, Spur
G14-120
12139
2
Gear, Spur
G14-30
12139
2
Gear, Spur
G12-130
12139
2
Gear, Spur
G12-40
12139
4
Gear, Spur
G12-120
12139
3
Gear, Spur
G12-60
12139
4
Gear, Spur
251-120SHA
2498
N48A-26
01351
2
12444
2
Gear, Spur AB
ACD6-120
12444
2
Gear, Spur AB
ACN2405-120
12444
4
Gear, Spur
Pin, Spring, CRES 1/16 Dia x 3/8
MS16562-192
13
Pin, Spring, CRES 1/16 Dia x 1/2
MS16562-194
6
Switch, Subminiature
Roller Leaf
CR3
2
Diode
5-95
1SM1-T
91929
1
JS-5
91929
1
IN1707
Coml
1
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
M1
M2
Meter, Cablewrap
Commercial
Part Number
728298-1
Mfr.
98825
Qty
Per
Unit
1
Meter, Beamwidth
727298-3
98825
1
Resistor Assembly
728718
98825
1
Resistor Subassembly
728720
98825
1
Air Force
Part Number
Description
Fed. Standard
Part Number
Resistor, MIL-R-11/3
RC20GF512J
1
Resistor, MIL-R- 11/3
RC20GF103J
1
Resistor, MIL-R-11/3
RC20GF392J
1
Resistor, MIL-R- 11/3
RC20GF272J
1
A1
Card, Scan Generator
728688
R1
Resistor, 1500Ω, 1/2W, 5%, MIL-R-11/3
RC20GF152J
1
R2
Resistor, 18K, 1/2W, 5%, MIL-R-11/3
RC20GF183J
2
R3
Resistor, 5620Ω, 1/8W, 1%, MIL-R-10509/1
RN60B5621F
2
R4
Resistor, 47Ω, 1/2W, 5%, MIL-R-11/3
RC20GF470J
1
R5
Resistor, 432Ω, 1/8W, 1%, MIL-R-10509/1
RN60B4320F
2
R6
Resistor, 909Ω, 1/2W, 1%, MIL-R-10509/3
RN70B909OF
4
R7
Resistor, 3920Ω, 1/8W, 1%, MIL-R-10509/1
RN60B3921F
1
R8
Potentiometer, 5K, 1W, 5%,
R9
Same as R6
R10
Same as R5
R11
Same as R6
224P-1502
5-96
98825
80294
1
1
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Air Force
Part Number
Same as R6
R13
Same as R3
R14
Same as R2
R 15
Resistor, 1820Ω, 1/8W, 1%, MIL-R-10509/1
RN60B1821F
2
R16
Resistor, 221Ω, 1/8W, 1%, MIL-R-10509/1
RN6OB2210F
2
R 17
Resistor, 475Ω, 1/4W, 1%, MIL-R-10509/2
RN65B4750F
1
R18
Same as R16
R19
Same as R15
R20
Resistor, 2700Ω, 1/2W, 5%, MIL-R-11/3
RC20GF272J
4
R21
Same as R20
R22
Resistor, 12K, 1/2W, 5%, MIL-R- 11/3
RC20GF123J
2
R23
Resistor, 100K, 1/2W, 5%, MIL-R-11/3
RC20GF104J
2
R24
Same as R23
R25
Same as R20
R26
Same as R20
R27
Same, as R22
C1
Capacitor, 15 µf, 15V, 10%
C2
Same as C1
C3
Same as C1
Description
Fed. Standard
Part Number
Commercial
Part Number
Qty
Per
Unit
Ref.
Desig.
R12
SCM156BP015D2
5-97
Mfr.
06228
3
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
Q1
Air Force
Part Number
Description
Transistor, MIL-T-19500A/99
Q2
Same as Q1
Q3
Same as Q1
Q4
Same as Q1
Q5
Transistor, MIL-T-19500/177
Q6
Same as Q5
Q7
Same as Q1
Q8
Same as Q1
Fed. Standard
Part Number
USA/2N697
Diode, MIL-F-1/1026
CR2
Same as CR1
CR3
Same as CR1
CR4
Same as CR1
CR5
Same as CR1
CR6
Same as CR1
CR7
Same as CR1
CR8
Same as CR1
CR9
Diode, Zener, MIL-S-19500/127
CR10
Same as CR9
CR11
Same as CR1
CR12
Same as CR1
CR13
Same as CR1
CR14
Same as CR1
Mfr.
USN/2N 1132
Nylon Transipad
CR1
Commercial
Part Number
2
A-10095
JAN/ 1N457
USN/1N752A
5-98
Qty
Per
Unit
6
07047
8
12
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Commercial
Part Number
728768
Mfr.
98825
Qty
Per
Unit
2
Grommet
G51H-C
0329 6
AR
Shaft, Extension
S025-11
57533
2
Ref.
Desig.
Air Force
Part Number
Description
Fed. Standard
Part Number
Bracket, Cable
J1
Receptacle
J2
Receptacle
J3
Receptacle
J4
Not used
J5
Not used
J6
Not used
J7
Not used
J8
Not used
J9
Not used
J10
Not used
J11
Connector
TP1
Test Point
TP2
Same as TP1
TB2
Terminal Strip
TB3
Same as TB2
R1
Resistor, Variable, 250Ω, 5W
R2
Resistor, Variable, 5K, MIL-R-94 15
R3
Resistor, Variable, 50K, MIL-R-94/5
MS3112E-2041P
MS3112E-1210S
MS3112E-3737S
1
1
1
K1-1500-22
05712
MS16108-2
RV4NAYSD502A
RV4NAYSD503A
5-99
1
2
10-140
75173
2
WN251
71590
1
1
1
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Description
Resistor, 620, ±5%, 1/2W. MIL-R- 11/3
R18
Resistor, 2.2K, ±5%, 1/2W. MIL-R-11/3
RC20GF222J
1
S1
Switch
MS35039-22
1
S2
Switch
S3
Not used
S4
Not used
S5
Not used
S6
Switch
S7
Switch
FL1
Filter
FL2
Same as FL1
K1
Relay
A2
Amplifier, Model A539
A3
Same as A2
C1
Capacitor, MIL-C-25/4
C2
Same as C1
C3
Capacitor, 1.5 µf, 200 VDC
C4
Same as C3
C5
Capacitor, 0.47 µf, 200 VDC
C6
Same as C5
CR4
Air Force
Part Number
Fed. Standard
Part Number
RC20GF621J
Commercial
Part Number
Qty
Per
Unit
1
Ref.
Desig.
R17
Mfr.
PA-2039
71590
1
PA-6003
71590
1
MS35059-27
1
GF-2967
07294
2
MHJ- 12D265V
A539-250CL3B6-A
70309
1
12745
2
CP53BIEF205KI
Diode
5-100
2
44M2155-DG
96733
2
12M2474-DG
96733
2
IN1601
Comrl
1
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
P1
P2
Commercial
Part Number
Mfr.
Qty
Per
Unit
2
Knob Crank
125-6-2G
49956
2
Knob, Dial
90-3-2G
49956
2
Knob, Control
70-2-2G
49956
3
Light Shield Assembly
4-1930
72619
2
Air Force
Part Number
Description
Connector
Fed. Standard
Part Number
MS3116E-1419S(SR)
Same as P1
Light, Indicator
MS2504 1-3
1
Lampholder
MS90282-1
2
Lamp, 28V, 0.04A
MS25237-327
13
Lamp, 28V, 0.04A
MS15571-6
2
Light, Indicator
MS2504 1-2
1
Light, Indicator
MS2504 1-4
9
Resistor Assembly
728718
98825
R5, R7
Resistor, Variable, 1K, 2W, 10%
RV4LAYSA102A
RV4LAYSA-
R6, R8
Resistor, Variable, 50K, 2W, 10%
R9, R10
Resistor, Fixed, 1Ω, 2W, 10%
RH-10
91637 2
Resistor Subassembly
728720
98825
1
2
2
1
R11
Resistor, Fixed, 5.1K, 1/2W, 5%
RC20GF512J
1
R12
Resistor, Fixed, 3.9K, 1/2W, 5%
RC20GF392J
1
R13, R16
Resistor, Fixed, 2.7K, 1/2W, 5%
RC20GF273J
2
5-101
CE-1008
TABLE 5-12. CONTROL INDICATOR, ANTENNA POSITION, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
R14
Description
Resistor, Fixed, 2.7K, 1/2W, 5%
R15
Resistor, Fixed. 10K, 1/2W. 5%
Air Force
Part Number
Fed. Standard
Part Number
RC20GF272J
RC20GF103J
5-102
Commercial
Part Number
Mfr.
Qty
Per
Unit
1
1
CE-1008
TABLE 5-13. ANTENNA CONTROL POWER SUPPLY, LOCATION AND
FUNCTION OF TEST POINTS AND ADJUSTMENTS
1.
Figure
Ref.
5-20
2.
Test Point or
Adjustment
Function
TP1, +28 VDC
Unregulated
Test point for checking the voltage level of the
+28 volts in unregulated DC.
5-20
TP2, Chassis Ground
Test Point
Test point for ground connection.
14.
5-29
R6, Radome Pressure
Gauge M1, Max. Adj.
Pot.
Allows adjustment of the maximum deflection of
the needle on pressure gauge M1.
15.
5-20
R3, Radome Pressure
Gauge M1, Min. Adj.
Pot.
Allows adjustment of the minimum deflection of
the needle on pressure gauge M1.
23.
5-20
TP3, +24 VDC
Regulated
Test point for checking the voltage level of the
+24 volts regulated DC.
25.
5-20
R1, +24 VDC Regulated
Adjustment
Allows adjustment of the level of the regulated DC
voltage.
5-103
CE-1008
TABLE 5-14. POWER SUPPLY - ANTENNA CONTROL, PARTS LIST
Figure
Ref.
Ref.
Desig.
M1
Air Force
Part Number
Description
Fed. Standard
Part Number
Meter, Pressure
Commercial
Part Number
728928-3
Mfr.
98825
Qty
Per
Unit
1
M2
Meter, mph
728428-1
98825
1
B1
Control, Synchro
23CDX6
75298
1
B2
Resolver
23RS6B
75298
1
Drive, Dual Speed
DSD-3
80134
1
T1
Transformer
H-133
80223
1
T2
Transformer
H-96
80223
1
K1, K2,
K3
CR1
thru
CR4
CR5
Relay, 10 Amp, 2 PDT, Class B8, Sealed
MS25273-D1
3
Diode, Semiconductor Device with insulating hardware
1N1199
81483
4
Diode, Semiconductor Device with insulating hardware
1N1608
81483
1
CB4
Circuit Breaker
225-290-101
79405
1
CB1
Circuit Breaker
225-220-101
79405
1
CB2
Circuit Breaker
124-210-101
79405
1
CB3
Circuit Breaker
124-220-101
79405
1
Switch, Toggle
MS24523-22
2
Light, Indicator
MS2504 1-3327
1
Fuseholder
HKL
74100
5
313005
75915
1
F1
Fuse
F2, F3,
Fuse
MS90078-12
3
Fuse
MS90080-2
1
F4
F5
5-104
CE-1008
TABLE 5-14. POWER SUPPLY - ANTENNA CONTROL, PARTS LIST (CONT)
Figure
Ref.
Air Force
Part Number
Jack, Tip, White
Fed. Standard
Part Number
MS16108-1
TP2
Jack, Tip, Black
MS16108-3
1
TP3
Jack, Tip, Red
MS16108-2
1
MS3112E-2041S
PT02SE-1418S
MS3102R-1810P
MS3112E-328S
MS3112E-1610S
1
Description
J1
Connector, Recp, Elec
J2
Connector, Recp, Elec
J3
Connector, Recp, Elec
J4
Connector, Recp, Elec
J5
Connector, Recp, Elec
A1
Resistor, Rect. Assembly
C1
Capacitor, 3300 , µf, 50 VDC
R1
Resistor, Variable, 250Q, 2W
R2
Resistor, 200Ω, 10W, 3%
R3
Resistor, Variable
R4
Commercial
Part Number
Qty
Per
Unit
1
Ref.
Desig.
TP1
Mfr.
1
1
1
1
728758
98825
1
CET1C-332G
05571
1
RV4LAYSA251A
1
1
Resistor, 1K, 1/2W, 5%
RA20LASB502A
RC20GF102K
R5
Resistor, 470Ω, 1/2W, 5%
RC20GF47 1K
1
R6
Resistor, Variable
RA20LASB501A
1
R7
Resistor, Variable, 250Ω 5%
R8
Resistor, 1.2K, 1/2W, 5%
Q1
Transistor
1
WN251
RC20GF122J
1
01295
1
1
2N 1718
5-105
71590
CE-1008
TABLE 5-15. MODULATOR, PARTS LIST
Figure
Ref.
Ref.
Desig.
A1, A2
Description
Integrated Circuit, Operational Amplifier
C1, C2
Capacitor, CER Disc, 0.01 µf, 1K V, ± 10%
C3, C4
Capacitor, CER Disc, 0.002 µf, 1K V, ± 20%
CR1 thru
CR8
Q1, Q3
Air Force
Part Number
Fed. Standard
Part Number
Commercial
Part Number
PP65AU
Mfr.
95023
CK63AW103K
Qty
Per
Unit
2
2
CCD202
04062
2
Diode, General Purpose
1N457
8
Transistor, PNP
2N3219
2
Q2, Q4
Transistor, NPN
2N3568
2
Q5, Q6
Transistor, NPN
2N697
2
R1, R7
Resistor, Fixed Carbon, 100K, 1/2W, ± 5%
RC20GF104J
2
R2, R9,
R10
R3
Resistor, Fixed Carbon, 20K, 1/2W, ± 5%
RC20GF203J
3
Resistor, Fixed Carbon, 500K 1/2W, ± 5%
RC20GF501J
1
R4, R6,
R12, R14
R8, R22
Resistor, Fixed Carbon, 10K, 1/2W, ± 5%
RC20GF103J
4
R11, R13
Resistor, Fixed Carbon, 15K, 1/2W, ±5%
RC20GF153J
2
R15, R17
Resistor, Fixed Carbon, 180K, 1/2W, ± 5%
RC20GF184J
2
Resistor, Fixed Carbon, Select, 1/2W, ± 5%
2
5-106
CE-1008
TABLE 5-15. MODULATOR, PARTS LIST (CONT)
Figure
Ref.
Description
Resistor, Metal Film, 1 meg, ±1%
R19, R20
Resistor, Metal Film, 475K, ±1%
RN65C4753F
2
R21, R24
Resistor, Fixed Carbon, 160K, 1/2W, ±5%
RC20GF164J
2
R23
Resistor, Fixed Carbon, 180Ω, 1/2W, ±5%
RC20GF 181J
1
R25
Resistor, Fixed Carbon, 8.2K, 1/2W, ± 5%
RC20GF822J
1
R26
Resistor, Fixed Carbon, 2.7K, 1/2W, ± 5%
RC20GF272J
1
R27
Resistor, Fixed Carbon, 270Ω, 1/2W, ±5%
RC20GF272J
1
R28
Resistor, Fixed Carbon, 15K, 2W, ±5%
RC42GF153J
1
R5
Resistor, Variable, 50K, 1W, ± 10%
56PR50K
80740
1
R16
Resistor, Variable, 20K, 1W, ±10%
56PR20K
80740
1
Transformer
SSO-3P
80223
1
Terminal, Turret
2010B
15849
8
PC Board
728439
98825 1
T1
TP1
thru
TP8
Air Force
Part Number
5-107
Fed. Standard
Part Number
RN65C1004F
Commercial
Part Number
Qty
Per
Unit
1
Ref.
Desig.
R18
Mfr.
CE-1008
TABLE 5-16. DEMODULATOR, PARTS LIST
Figure
Ref.
Ref.
Desig.
A1
Description
Integrated Circuit, Operational Amplifier
C1, C2
Capacitor, CER Disc, 0.01, µf, 1 KV, ± 10%
Air Force
Part Number
Fed. Standard
Part Number
Commercial
Part Number
PP65AU
CK63AW103K
Mfr.
95023
Qty
Per
Unit
1
05162
2
C3
Capacitor, Mylar, 0.1, µf, 100V, ± 10%
210B1B106M
14752
1
C4
Capacitor, Mylar, 10 µf, 100V, ±20%
210B1B106M
14752
1
CR1 thru
CR10
R1, R3
Diode, General Purpose
1N457
10
Resistor, Fixed Carbon, 4.7K, 1/2W, ±5%
RC20GF472J
2
R4, R5,
R16
R6, R7
Resistor, Fixed Carbon, 15K, 1/2W, ±5%
RC20GF153J
3
Resistor, Fixed Carbon, 10K, 1/2W, ±5%
RC20GF103J
2
R8,R15
Resistor, Fixed Carbon, 100K, 1/2W, ±5%
RC20GF104J
2
R9, R11
Resistor, Fixed Carbon, 180K, 1/2W, ±5%
RC20GF184J
2
R12, R13
Resistor, Metal Film, 20.0K, 1/2W, ±1%
RN65C2002F
2
R14
Resistor, Metal Film, 1 meg, 1/2W, ± 1%
RN65C1004F
1
5-108
CE-1008
TABLE 5-16. DEMODULATOR, PARTS LIST (CONT)
Figure
Ref.
Air Force
Part Number
Fed. Standard
Part Number
RC20GF
Commercial
Part Number
Qty
Per
Unit
1
Ref.
Desig.
R17
Description
Resistor, Fixed Carbon, Select, 1/2±, ±5%
R18
Resistor, Fixed Carbon, 160K, 1/2W, ±5%
RC20GF164J
1
R19
Resistor, Fixed Carbon, 2K, 1/2W, ±5%
RC20GF202J
1
R20
Resistor, Fixed Carbon, 20K, 1/2W, ±5%
RC20GF203J
1
R21
Resistor, Fixed Carbon, 15K, 2W,± 5%
RC42GF153J
1
R10
Resistor, Variable, 20K, 20K, 1W, 10%
R2
Resistor, Fixed Carbon, 470Ω, 1/2W, 5%
T1
Transformer
56PR20K
Mfr.
80740
RC20GF47 1K
1
1
SSO-3P
80223
1
2010B
15849
6
TP1
thru
TP6
Q1, Q2
Terminal-Turret
Transistor, PNP
2N3219
2
Q3, Q4
Transistor, NPN
2N3568
2
PC Board
728443
5-109
98825
1
CE-1008
TABLE 5-17. WRITING GUN RELAY DRIVER, PARTS LIST
Figure
Ref.
Ref.
Desig.
A1
C1
C2, C3
CR1
thru
CR6
K1
Q1
Air Force
Part Number
Description
Integrated Circuit, Operational Amplifier
Fed. Standard
Part Number
Capacitor, Mylar, 10 µf, 100V, ±20%
Commercial
Part Number
PP65AU
Mfr.
95023
Qty
Per
Unit
1
210B1B106M
14752
1
05162
2
CK63AW103K
Capacitor, Ceramic Disc, 0.01µf, 1 KV, ± 10%
Diode, General Purpose
1N457
Relay, 25V, DPDT
6
5D600V25
Transistor, NPN
1
2N697
1
RC42GF680J
4
R1, R2,
Resistor, Fixed Carbon.
R3, R4
68Q, 2W, ± 5%
R5, R6,
R10
R7, R9
Resistor, Fixed Carbon, 51K, 1/2W, ±5%
RC20GF513J
3
Resistor, Fixed Carbon, 5.1K, 1/2W, ± 5%
RC20GF512J
2
RC20GF
1
R11
Resistor, Fixed Carbon, Select, 1/2W, ± 5%
R12
Resistor, Fixed Carbon, 4.7K, 1/2W, ± 5%
RC20GF472J
1
R13
Resistor, Fixed Carbon, 10K, 1/2W, ± 5%
RC20GF103J
1
R8
Resistor, Variable, 10K, 1W, ± 10%
TP1
thru
TP6
Terminal-Turret
5-110
56PR100K
80740
1
2010B
15849
6
CE-1008
TABLE 5-17. WRITING GUN RELAY DRIVER, PARTS LIST (CONT)
Figure
Ref.
Ref.
Desig.
VR1
thru
VR6
Air Force
Part Number
Description
Diode, Zener
PC Board
5-111
Fed. Standard
Part Number
1N4733A
Commercial
Part Number
Mfr.
Qty
Per
Unit
6
728435
98825
1
By Order of the Secretary of the Army:
HAROLD K. JOHNSON,
General, United States Army,
Chief of Staff.
Official:
KENNETH G. WICKHAM,
Major General, United States Army,
The Adjutant General.
U.S. GOVERNMENT PRINTING OFFICE: 1974 O - 580-851(5702A)
The Metric System and Equivalents
Linear Measure
Liquid Measure
1 centiliter = 10 milliters = .34 fl. ounce
1 deciliter = 10 centiliters = 3.38 fl. ounces
1 liter = 10 deciliters = 33.81 fl. ounces
1 dekaliter = 10 liters = 2.64 gallons
1 hectoliter = 10 dekaliters = 26.42 gallons
1 kiloliter = 10 hectoliters = 264.18 gallons
1 centimeter = 10 millimeters = .39 inch
1 decimeter = 10 centimeters = 3.94 inches
1 meter = 10 decimeters = 39.37 inches
1 dekameter = 10 meters = 32.8 feet
1 hectometer = 10 dekameters = 328.08 feet
1 kilometer = 10 hectometers = 3,280.8 feet
Square Measure
Weights
1 sq. centimeter = 100 sq. millimeters = .155 sq. inch
1 sq. decimeter = 100 sq. centimeters = 15.5 sq. inches
1 sq. meter (centare) = 100 sq. decimeters = 10.76 sq. feet
1 sq. dekameter (are) = 100 sq. meters = 1,076.4 sq. feet
1 sq. hectometer (hectare) = 100 sq. dekameters = 2.47 acres
1 sq. kilometer = 100 sq. hectometers = .386 sq. mile
1 centigram = 10 milligrams = .15 grain
1 decigram = 10 centigrams = 1.54 grains
1 gram = 10 decigram = .035 ounce
1 decagram = 10 grams = .35 ounce
1 hectogram = 10 decagrams = 3.52 ounces
1 kilogram = 10 hectograms = 2.2 pounds
1 quintal = 100 kilograms = 220.46 pounds
1 metric ton = 10 quintals = 1.1 short tons
Cubic Measure
1 cu. centimeter = 1000 cu. millimeters = .06 cu. inch
1 cu. decimeter = 1000 cu. centimeters = 61.02 cu. inches
1 cu. meter = 1000 cu. decimeters = 35.31 cu. feet
Approximate Conversion Factors
To change
To
inches
feet
yards
miles
square inches
square feet
square yards
square miles
acres
cubic feet
cubic yards
fluid ounces
pints
quarts
gallons
ounces
pounds
short tons
pound-feet
pound-inches
Multiply by
centimeters
meters
meters
kilometers
square centimeters
square meters
square meters
square kilometers
square hectometers
cubic meters
cubic meters
milliliters
liters
liters
liters
grams
kilograms
metric tons
Newton-meters
Newton-meters
2.540
.305
.914
1.609
6.451
.093
.836
2.590
.405
.028
.765
29,573
.473
.946
3.785
28.349
.454
.907
1.356
.11296
To change
ounce-inches
centimeters
meters
meters
kilometers
square centimeters
square meters
square meters
square kilometers
square hectometers
cubic meters
cubic meters
milliliters
liters
liters
liters
grams
kilograms
metric tons
To
Newton-meters
inches
feet
yards
miles
square inches
square feet
square yards
square miles
acres
cubic feet
cubic yards
fluid ounces
pints
quarts
gallons
ounces
pounds
short tons
Temperature (Exact)
°F
Fahrenheit
temperature
5/9 (after
subtracting 32)
Celsius
temperature
°C
Multiply by
.007062
.394
3.280
1.094
.621
.155
10.764
1.196
.386
2.471
35.315
1.308
.034
2.113
1.057
.264
.035
2.205
1.102
PIN: 019680-000
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