Valcom AS-3772B/U Manuale utente
TECHNICAL MANUAL
OPERATION AND INSTALLATION
INSTRUCTIONS
ANTENNA
AS-3772B/U
Document No: VTM-91-772/C
Valcom Manufacturing Group, Inc.
175 Southgate Drive, P.O.Box 603, Guelph, Ontario, Canada N1H 6L3 Tel: 519-824-3220 Fax: 519-824-3411
VTM-91-772/C
i
RECORD OF CHANGES
CHANGE
NUMBER DATE TITLE OF BRIEF
DESCRIPTION ENTERED
BY
A Mar 2004 General Formatting Edits Jason Soper
B Aug 2007 Added Maintenance Section Jason Soper
C Nov 2013 Various minor improvements Jason Soper
VTM-91-772/C
ii
TABLE OF CONTENTS
Section Page
1 GENERAL INFORMATION AND SAFETY PRECAUTIONS
1-1 General Safety Precautions ............................................... 1
1-2 SpecificWarnings ...................................................... 1
1-3 Introduction ........................................................... 2
1-4 Equipment Description .................................................. 2
1-5 RelationshiptoOtherEquipment........................................... 2
1-6 ReferenceData......................................................... 2
1-7 Equipment Accessories, and Documents Supplied ............................. 2
2 OPERATION ................................................................ 5
2-1 Introduction ........................................................... 5
2-2 ControlsandIndicators .................................................. 5
2-3 OperatingProcedures.................................................... 5
2-3.1OperatorTurn-on .................................................. 5
2-3.2ModesofOperation ................................................ 5
2-3.3OperationUnderInterferingConditions................................. 5
2-3.4OperatorTurn-off .................................................. 5
2-3.5EmergencyOperation............................................... 5
2-3.6EmergencyTurn-off ................................................ 5
3 FUNCTIONAL DESCRIPTION ................................................. 6
3-1 Introduction ........................................................... 6
3-2 OverallLevel ........................................................ 6
3-3 MajorFunctionLevel ................................................... 6
3-3.1 Feedwire Assembly ................................................ 6
4 INSTALLATION ............................................................. 7
4-1 SiteInformation ........................................................ 7
4-2 ToolsandMaterialsRequired ............................................. 7
4-3 UnpackingandRepacking................................................ 7
4-4 Foundation ............................................................ 7
4-5 Input Requirements ..................................................... 7
4-6 InstallationProcedures................................................... 7
4-7 Installation Checkout .................................................... 8
5 MAINTENANCE ............................................................ 10
5-1 PreventativeMaintenance ............................................... 10
5-2 CorrectiveMaintenance................................................. 10
6 QUICK REFERENCE DATA .................................................. 12
6-1 General.............................................................. 12
6-2 Manufacturer’sAddress................................................. 12
VTM-91-772/C
iii
LIST OF ILLUSTRATIONS
Figure Page
4-1 InstallationData...................................................9
LIST OF TABLES
Table Page
1-1 ReferenceData..........................................................3
1-2 EquipmentandDocumentsSupplied.........................................4
VTM-91-772/C
-1-
SECTION 1
GENERAL INFORMATION AND SAFETY PRECAUTIONS
1-1. GENERAL SAFETY PRECAUTIONS
Thefollowing general safety precautionsare not related to any specific procedures and therefore do
not appear elsewhere in this publication. These are recommended precautions that personnel must
understand and apply during many phases of operation and maintenance.
WARNING
Keep away from live circuits. Operating personnel must at all times observe all
safety regulations, to prevent serious injury or death due to electrical shock.
Do not service or adjust alone. Under no circumstances should any person service
or adjust the equipment except in the presence of someone who is capable of
rendering aid.
Personnel working with or near high voltages should be familiar with modern
methods of resuscitation.
1-2 SPECIFIC WARNINGS
The following specific precautions are related to inspecting and removing the antenna.
WARNING
Ensure that the transmitting equipment is de-energized prior to inspection of the
antenna. Make sure the test equipment is properly grounded, to prevent electric
shock.
CAUTION
Makesuretheantennaisproperlysupportedbeforeremovingitsmountinghardware.
CAUTION
Do not coat the insulator with any substance; do not paint with lead base paints.
VTM-91-772/C
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1-3. INTRODUCTION
1-3.1 Purpose. This manual provides general information on the AS-3772B/U, as well as an
operational and functional description of the antenna and installation data. Information in this
manual will assist in installing and operating the antenna.
1-3.2 Scope. This technical manual is provided to aid in the operation and installation of the
antenna.
1-3.3 Applicability. This manual applies to the single whip application of Antenna AS-3772B/U.
Wherethisantennaisusedintwinwhipapplication,consulttheappropriateantennagrouptechnical
manual.
1-4. EQUIPMENT DESCRIPTION
1-4.1 General Description. The antenna, shown in Figure 4-1 is a 35 foot transmitting/receiving
whip antenna for general use with HF communications equipment. The antenna has an aluminum
radiating element and an integral fibreglass insulator/mounting base.
1-4.2 Capabilities. The antenna provides vertically polarized, omnidirectional azimuth radiation
from 2 to 30 MHz when the antenna is operated in either a twin whip and tuner configuration or
single whip and tuner configuration. It may be employed for general purpose broadband
communications reception from VLF to 30 MHz. The antenna is a two section antenna and is base
mounted. The mounting flange is a single integral part made from fibreglass.
1-4.3 Limitations. When used as directed, the antenna has no limitations.
1-5. RELATIONSHIP TO OTHER EQUIPMENT
The AS-3772B/U Antenna interfaces with the HF receiving and transmitting equipment.
1-6. REFERENCE DATA
Table 1-1 lists the reference data for the antenna.
1-7. EQUIPMENT ACCESSORIES, AND DOCUMENTS SUPPLIED
Table 1-2 lists the equipment and documents supplied.
VTM-91-772/C
-3-
Table 1-1. Reference Data
PARAMETER SPECIFICATION
NOMENCLATURE
MANUFACTURER
FREQUENCY RANGE
IMPEDANCE
POLARIZATION
POWER CAPABILITY
RADIATION PATTERN
TEMPERATURE
WIND VELOCITY
HUMIDITY
SHOCK
VIBRATION
ANTENNA AS-3772B/U
VALCOM MANUFACTURING GROUP, INC. 35736
TRANSMITTING: 2 TO 30 MHZ
VARIES
VERTICAL
5 KW SINGLE ANTENNA
OMNIDIRECTIONAL
OPERATING: -54°C TO +65°C
NON OPERATING: -62°C TO +71°C
115 MPH
95%
QUALIFIED TO MEET MIL-S-901C, GRADE A
QUALIFIED TO MEET MIL-STD-167-1 TYPE I
VTM-91-772/C
-4-
Table 1-2. Equipment, Accessories and Documents Supplied
QTY NOMENCLATURE
OVERALL DIMENSIONS (INCHES) WEIGHT
(POUNDS)
UNCRATED
CRATED UNCRATED
HEIGHT DIA HEIGHT DIA
1 ANTENNA
AS-3772B/U --- --- 421 13.00
(BASE) 196
1 TECHNICAL
MANUAL FOR
AS-3772B/U
ANTENNA
VTM-91-770
1 SILCONE
SEALANT
12 MS24693-C140
3/8-16 x 0.75 L
FLAT HD SCREW
1 MIL-A-907E ANTI-
SEIZE
COMPOUND
VTM-91-772/C
-5-
SECTION 2
OPERATION
2-1. INTRODUCTION
This chapter provides operating instructions for the antenna.
2-2. CONTROLS AND INDICATORS
The antenna contains no controls or indicators.
2-3. OPERATING PROCEDURES
2-3.1 Operator Turn-On. No operator turn-on procedures apply since no power is required to
operate the antenna. However, the antenna is coupled to RF equipment (transmitter/receiver) and
to associated systems which may require energizing. For operating instructions, consult the
appropriate technical manuals.
2-3.2 Modes of Operation. The antenna operated automatically, and no operator intervention is
required other than interconnecting various associated equipment with the antenna.
2-3.3 OperationUnderInterferingConditions.Noadditionaloralternateinstructionsarenecessary
to operate the antenna under interfering conditions.
2-3.4 Operator Turn-off. Since no power is required to operate the antenna, no operator turn-off
is required. However, the specific equipment connected to the antenna may require operator turn-
off. Consult the associated technical manuals for turn-off procedures.
2-3.5 Emergency Operation. No additional or alternate steps are necessary to operate the antenna
under emergency conditions.
2-3.6 Emergency Turn-off. The antenna requires no emergency turn-off. For emergency turn-off
of specific equipment connected to the antenna, consult the associated technical manuals.
VTM-91-772/C
-6-
SECTION 3
FUNCTIONAL DESCRIPTION
3-1. INTRODUCTION
This chapter provides the functional description of the antenna.
3-2. OVERALL LEVEL
The antenna is a base mounted, high-power antenna which provides omnidirectional coverage for
general purpose communications reception and transmission from 2 to 30 MHz when used in either
a twin whip and tuner configuration or single whip and tuner configuration.
3-3. MAJOR FUNCTION LEVEL
Theantennaconsistsofanaluminumradiatingelementandanintegralfibreglassinsulator/mounting
flange. The aluminum radiating element tapers from approximately 8 inches in diameteratthe base
insulatorto2inchesindiameteratthetop.Theintegralfibreglassinsulator/mountingflangeisolates
the radiating element of the antenna from the ground and physically supports the element. The
insulator/mounting flange is constructed of high-strength, laminated epoxy fibreglass materials.
When assembled, the overall length of the antenna is approximately 35 feet. The antenna
disassembles into 2 sections.
Whenthe antennais used for transmitting, an antenna coupler is required. Whenusedfor receiving,
theantennarequirestheuseofaterminationbox. Fortransmittingorreceiving,afeedwireassembly
is required to connect the antenna to the antenna coupler or termination box.
3-3.1 Feedwire Assembly. The feedwire assembly is provided by installing activity and provides
a means of attaching the antenna tuner or termination box to the antenna.
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