Valcom AS-3226B/URC Manuale utente
Valcom Manufacturing Group, Inc.
175 Southgate Drive, P.O. Box 603, Guelph, Ontario, Canada N1H 6L3 Tel: 519-824-3220 Fax: 519-824-3411
TECHNICAL MANUAL
VTM-01-009 -RevE
OPERATION AND INSTALLATION
INSTRUCTIONS
AS-3226B/URC
VHF ANTENNA
AS-3226B/URC VTM-01-009-RevE
REVISION SHEET
Revision Description Date
A - Original Issue - January 8, 1998
B
- Assigned Document Reference Number : VTM-01-009
-RemovedreferencestohavingareplaceableRFconnector
- Edited VSWR specification from 3.5:1 to 3.0:1
- Miscellaneous formatting changes
October 19, 2001
C- bolt circle changed from 3.500 to 3.375 on pg 15
- reformat title page to preferred standard July 3, 2002
D- Added the Inspection and wash down preventative
maintenance paragraph in section 4.2 on page 7
- Other minor improvements to formatting April 19, 2012
E- Fixed base dimensions on page 15
- Edited Reference info February 25, 2019
Errors in this publication can be reported to the Manufacturer.
Refer to Section 7 for contact information and address
attention to the Engineering Department.
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AS-3226B/URC VTM-01-009-RevE
TABLE OF CONTENTS
Section Page
1 GENERAL INFORMATION AND SAFETY PRECAUTIONS ............... 1
1-1 Safety Precautions ................................................ 1
1-2 Introduction ..................................................... 1
1-3 EquipmentDescription ............................................ 1
1-4 RelationshiptoOtherEquipment .................................... 1
1-5 ReferenceData .................................................. 1
1-6 EquipmentandDocumentsSupplied ................................. 1
1-7 EquipmentandPublicationsRequiredButNotSupplied .................. 1
2 OPERATION ........................................................ 5
2-1 General ........................................................ 5
3 FUNCTIONAL DESCRIPTION ......................................... 6
3-1 FunctionalDescription .............................................. 6
a. ElectricalBalance .......................................... 6
b. RadiationPatterns .......................................... 6
4 SCHEDULED MAINTENANCE ........................................ 7
4-1 Introduction ..................................................... 7
4-2 ScheduledMaintenanceActionIndex ................................ 7
4-3 PreventiveMaintenanceProcedures .................................. 7
4-4 ScheduledPerformanceTests ....................................... 8
a. Safety Precautions .......................................... 8
b. ToolsandTestEquipment ................................... 8
c. Title of Test ............................................... 8
d. MinimumRatingofTechnician ............................... 8
e. VSWRTestSetup .......................................... 8
f. Procedures ................................................ 9
g. TestValues ............................................... 9
h. CorrectiveActions ......................................... 9
5 TROUBLESHOOTING ............................................... 10
5-1 Introduction .................................................... 10
5-2 Troubleshooting Index ........................................... 10
5-3 MaintenanceTurn-OnProcedures .................................. 10
5-4 Troubleshooting Procedures ....................................... 10
Valcom Manufacturing Group Inc
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AS-3226B/URC VTM-01-009-RevE
6 CORRECTIVE MAINTENANCE ...................................... 12
6-1 Introduction .................................................... 12
6-2 AdjustmentsandAlignment ....................................... 12
6-3 Repair ........................................................ 12
7 PARTSLIST ........................................................ 13
7-1 Introduction .................................................... 13
a. ListofParts ............................................. 13
b. ListofManufacturers ...................................... 13
8 INSTALLATION .................................................... 14
8-1 SiteInformation ................................................ 14
8-2 ToolsandMaterialsRequired ...................................... 14
8-3 UnpackingandRepacking ........................................ 14
8-4 Foundation .................................................... 14
8-5 Input Requirements .............................................. 14
8-6 InstallationProcedures ........................................... 14
8-7 Installation Checkout ............................................ 14
LIST OF FIGURES
Figure Page
1-1 VHF Antenna AS-3226B/URC ...................................... 2
3-1 BalancingTransformerArrangement ................................. 6
4-1 VSWRTestSetup ................................................ 9
8-1 InstallationData ................................................ 15
LIST OF TABLES
Table Page
1-1 ReferenceData ........................................................ 3
1-2 EquipmentandDocumentsSupplied ....................................... 3
1-3 EquipmentandPublicationsRequiredButNotSupplied ........................ 4
4-1 ScheduledMaintenanceActionIndex ...................................... 8
5-1 Troubleshooting Index ................................................. 10
5-2 Troubleshooting Procedures ............................................. 11
7-1 ListofParts .......................................................... 13
7-2 ListofManufacturers .................................................. 13
Valcom Manufacturing Group Inc
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AS-3226B/URC VTM-01-009-RevE
SECTION 1
GENERAL INFORMATION AND SAFETY PRECAUTIONS
1-1. SAFETY PRECAUTIONS.
When working in the vicinity of the VHF Antenna AS-3226B/URC, make sure the
antenna is deenergized in accordance with the WARNING in paragraphs 4-3 and 4-4, and
when testing the antenna, make sure the test equipment is properly grounded in
accordance with WARNING in paragraph 4-4.
1-2. INTRODUCTION.
This manual provides general information, operating and functional descriptions,
maintenance and troubleshooting instructions, parts list data, and installation data for
VHF Antenna AS-3226B/URC.
1-3. EQUIPMENT DESCRIPTION.
The AS-3226B/URC VHF Antenna (see figure 1-1) is a general purpose, high
performance, reliable, vertically polarized, broadband dipole covering the 30 to 88 MHz
frequency range. It is designed for use under the severe environmental conditions
encountered aboard naval vessels. It is used for either receiving or transmitting Very High
Frequency signals. The antenna is a base-mounted light-weight, single piece fiberglass
vertical dipole.
1-4. RELATIONSHIP TO OTHER EQUIPMENT.
The AS-3226B/URC VHF Antenna interfaces with the ship's VHF receiving and
transmitting equipment.
1-5. REFERENCE DATA.
Table 1-1 lists the reference data for the antenna.
1-6. EQUIPMENT AND DOCUMENTS SUPPLIED.
Table 1-2 lists the equipment and documents supplied.
1-7. EQUIPMENT AND PUBLICATIONS REQUIRED BUT NOT SUPPLIED.
Table 1-3 lists the equipment and publications required but not supplied.
Valcom Manufacturing Group Inc
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AS-3226B/URC VTM-01-009-RevE
Figure 1-1 VHF Antenna AS-3226B/URC
Valcom Manufacturing Group Inc
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AS-3226B/URC VTM-01-009-RevE
Table 1-1. Reference Data
Parameter Specification
Nomenclature Antenna AS-3226B/URC
Manufacturer Valcom Manufacturing Group Inc 35736
Frequency Range 30 to 88 MHz
Impedance 50 ohms
VSWR less than 3.0:1
Polarization Vertical
Power Capability 800 watts
Gain 0 dBi
Radiation Pattern Horizontal - omnidirectional
Vertical - figure 8
Temperature Operating: -54EC to +65EC
Non Operating: -62EC to +71EC
Wind Velocity 120 mph
Humidity 95%
Shock Qualified to meet MIL-S-901C, Grade A
Vibration Qualified to meet MIL-STD-167, Type I
Table 1-2. Equipment and Documents Supplied
Qty Nomenclature
Overall Dimensions (inches) Weight
Uncrated
Crated Uncrated
Length Width (sq) Height Diameter
1VHF Antenna AS-
3226B/URC 156 18 149 4.25 47 lbs
1Technical Manual
VTM-01-009 -- -- -- -- --
Valcom Manufacturing Group Inc
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AS-3226B/URC VTM-01-009-RevE
Table 1-3. Equipment and Publications Required But Not Supplied
Category Recommended
Equipment Alternate Test
Parameter Application
Power Supply General Radio
Type 1203-B Hewlett
Packard
Generator
Model 608E
VSWR equal to
or less than 3.0:1
Scheduled
maintenance
and trouble-
shooting
Modulating
Source General Radio
Type 1214-A
VHF Generator General Radio
Type 1211-C and
Type 1215-C
Impedance
Bridge PRD Electronic
Type 3302 --
Standing Wave
Indicator HP Model 415B General Radio
Type 1234
Electronic
Counter HP Type 5246L HP Type
5340A
Megohmmeter Freed Type 1620 --
Insulation
Resistance
greater than 1
megohm
Trouble-
shooting
Valcom Manufacturing Group Inc
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AS-3226B/URC VTM-01-009-RevE
SECTION 2
OPERATION
2-1. GENERAL.
The AS-3226B/URC Antenna has no operating controls or indicators. It operates only
when the ship's VHF receiving and transmitting equipment is operated.
Valcom Manufacturing Group Inc
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AS-3226B/URC VTM-01-009-RevE
Figure 3-1 Balancing Transformer Arrangement
SECTION 3
FUNCTIONAL DESCRIPTION
3-1. FUNCTIONAL DESCRIPTION.
The AS-3226B/URC VHF Antenna is a general purpose, high performance, vertically
polarized, broadband, balanced dipole covering the 30 to 88 MHz frequency range. It is
used for either transmitting or receiving. The antenna is a cylindrical dipole radiator fed
by a conventional coaxial RF line. Integrated into the antenna structure is a balancing
transformer arrangement, which allows the dipole radiator to be fed in a balanced manner
eliminating extraneous line currents. (see figure 3-1).
a. Electrical Balance. The electrical balance provided for the radiating elements permits
feeding the antenna directly by 50 ohm coaxial cable. The input VSWR is less than
3.0:1 on 50 ohms.
b. Radiation Patterns. Radiation patterns for the antenna correspond to those of a
balanced dipole in free space. Coverage in the plane perpendicular to the radiating
elements is omnidirectional. Figure 8 coverage, with nulls off the ends of the
elements, is provided in the plane of the radiators. The inherent broadband impedance
characteristics make the antenna relatively insensitive to its mounting environment and
minimize azimuth and zenith pattern distortion at any location.
Valcom Manufacturing Group Inc
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