Valcom AS-3226C/URC Manuale utente
TECHNICAL MANUAL
VTM-07-007
OPERATION AND INSTALLATION
INSTRUCTIONS
AS-3226C/URC
VHF ANTENNA
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
i
Valcom Manufacturing Group, Inc.
175 Southgate Drive, P.O. Box 603, Guelph, Ontario, Canada N1H 6L3 Tel: 519-824-3220 Fax: 519-824-3411
REVISION SHEET
Revision Description Date
- - Original Issue - November 13, 2007
Errors in this publication can be reported to the Manufacturer.
Refer to Section 6 for contact information and address
attention to the Engineering Department.
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
ii
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
6 CORRECTIVE MAINTENANCE ...................................... 12
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
iii
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-3226C/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
1-4 FieldandFactoryChanges ............................................... 4
4-1 ScheduledMaintenanceActionIndex ...................................... 8
5-1 Troubleshooting Index ................................................. 10
5-2 Troubleshooting Procedures ............................................. 11
7-1 ListofParts .......................................................... 13
7-2 ListofManufacturers .................................................. 13
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
1
SECTION 1
GENERAL INFORMATION AND SAFETY PRECAUTIONS
1-1. SAFETY PRECAUTIONS. When working in the vicinity of VHF Antenna AS-
3226C/URC, make sure the antenna is de-energized 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-3226C/URC.
1-3. EQUIPMENT DESCRIPTION. The AS-3226C/URC VHF Antenna (see figure 1-1) is a
general purpose, high performance, reliable, vertically polarized, broadband dipole covering the
30 to 108 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-3226C/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.
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
2
Figure 1-1 VHF Antenna AS-3226C/URC
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
3
Table 1-1. Reference Data
Parameter Specification
Nomenclature Antenna AS-3226CB/URC
Manufacturer Valcom Mgf Grp, Inc 35736
Frequency Range 30 to 108 MHz
Impedance 50 ohms
VSWR less than 3.0:1
Polarization Vertical
Power Capability 1000 watts
Gain 0 dBi (nominal)
Radiation Pattern Horizontal - omnidirectional
Vertical - figure 8
Temperature Operating: -54°C to +65°C
Non Operating: -62°C to +71°C
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-
3226C/URC 156 18 149 4.25 47 lbs
1Technical Manual
VTM-07-00? -- -- -- -- --
Table 1-3. Equipment and Publications Required But Not Supplied
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
4
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
Table 1-4. Field and Factory Changes
Change Number Nomenclature Description
None -- --
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
5
SECTION 2
OPERATION
2-1. GENERAL. The AS-3226C/URC Antenna has no operating controls or indicators. It
operates only when the ship's VHF receiving and transmitting equipment is operated.
AS-3226C/URC VTM-07-007
Valcom Manufacturing Group, Inc.
6
Figure 3-1 Balancing Transformer Arrangement
SECTION 3
FUNCTIONAL DESCRIPTION
3-1. FUNCTIONAL DESCRIPTION. The AS-3226C/URC VHF Antenna is a general
purpose, high performance, vertically polarized, broadband, balanced dipole covering the 30 to
108 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.
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