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AS-3226B/URC

VTM-01-009-RevE

SECTION 6

CORRECTIVE MAINTENANCE

6-1. INTRODUCTION

. No corrective maintenance can be performed on the AS-3226B/URC

VHF Antenna.

6-2. ADJUSTMENTS AND ALIGNMENT

. No adjustments and alignment are applicable to

the antenna.

6-3. REPAIR

. No repair of the antenna or any of its parts is applicable.

Valcom Manufacturing Group Inc

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Summary of Contents for AS-3226B/URC

Page 1: ...hgate Drive P O Box 603 Guelph Ontario Canada N1H 6L3 Tel 519 824 3220 Fax 519 824 3411 Web Site www valcommfg ca E mail sales valcomguelph com TECHNICAL MANUAL VTM 01 009 RevE OPERATION AND INSTALLATION INSTRUCTIONS AS 3226B URC VHF ANTENNA ...

Page 2: ...ircle 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...

Page 3: ... 6 3 1 Functional Description 6 a Electrical Balance 6 b Radiation Patterns 6 4 SCHEDULED MAINTENANCE 7 4 1 Introduction 7 4 2 Scheduled Maintenance Action Index 7 4 3 Preventive Maintenance Procedures 7 4 4 Scheduled Performance Tests 8 a Safety Precautions 8 b Tools and Test Equipment 8 c Title of Test 8 d Minimum Rating of Technician 8 e VSWR Test Setup 8 f Procedures 9 g Test Values 9 h Correc...

Page 4: ...rements 14 8 6 Installation Procedures 14 8 7 Installation Checkout 14 LIST OF FIGURES Figure Page 1 1 VHF Antenna AS 3226B URC 2 3 1 Balancing Transformer Arrangement 6 4 1 VSWR Test Setup 9 8 1 Installation Data 15 LIST OF TABLES Table Page 1 1 Reference Data 3 1 2 Equipment and Documents Supplied 3 1 3 Equipment and Publications Required But Not Supplied 4 4 1 Scheduled Maintenance Action Index...

Page 5: ... 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 ...

Page 6: ...AS 3226B URC VTM 01 009 RevE Figure 1 1 VHF Antenna AS 3226B URC Valcom Manufacturing Group Inc 2 ...

Page 7: ...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 1 VHF Anten...

Page 8: ...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 Troubl...

Page 9: ...09 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 5 ...

Page 10: ...d 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...

Page 11: ...scheduled performance tests When used in salt water environments it is recommended to wash the antenna base with fresh water to remove any build up of dried salt residue This should be performed on a monthly basis or after prolonged exposure to sea spray 4 3 PREVENTATIVE MAINTENANCE PROCEDURES The following procedures included the information required for the antenna preventive maintenance The ant...

Page 12: ...uled Maintenance Action Index Periodicity Maintenance Action Reference A Inspect antenna for dirt 4 3 a A Check painted surfaces for wear chipping etc 4 3 b A Check the VSWR of the antenna 4 4 b Tools and Test Equipment No tools are required The power supply modulating source VHF generator impedance bridge standing wave indicator and electronic counter in table 1 3 are used for this check c Title ...

Page 13: ...lectronic counter b Tune impedance bridge for maximum reading as indicated on standing wave indicator c Set reference level on standing wave indicator to 1 0 on SWR scale d Tune impedance bridge for minimum reading as indicated by standing wave indicator e Read VSWR on standing wave indicator on SWR scale g Test Values If VSWR is 3 0 1 or greater internal damage is indicated h Corrective Action Re...

Page 14: ... in this section The antenna is essentially a sealed assembly and as such is non repairable 5 2 TROUBLESHOOTING INDEX Table 5 1 lists possible troubles with references to the appropriate procedures in this section 5 3 MAINTENANCE TURN ON PROCEDURE The AS 3226B URC VHF Antenna is turned on when the ship s VHF receiving and transmitting equipment is turned on 5 4 TROUBLESHOOTING PROCEDURES Table 5 2...

Page 15: ...ohmmeter connected between inner and outer conductors of RF connector 1 Defective RF connector or RF gasket 2 Defective internal assembly in antenna Replace antenna High VSWR greater than 3 0 1 as indicated by VSWR test described in paragraph 4 4 1 Defective RF connector or RF gasket 2 Defective internal assembly in antenna Replace antenna Valcom Manufacturing Group Inc 11 ...

Page 16: ...UCTION No corrective maintenance can be performed on the AS 3226B URC VHF Antenna 6 2 ADJUSTMENTS AND ALIGNMENT No adjustments and alignment are applicable to the antenna 6 3 REPAIR No repair of the antenna or any of its parts is applicable Valcom Manufacturing Group Inc 12 ...

Page 17: ... Table 7 2 contains the name address and Federal Supply Code for Manufacturers of the manufacturers supply items for the equipment as referenced in Table 7 1 Table 7 1 List of Major Units UNIT NUMBER NOMENCLATURE Name of Unit Designation Page Number 1 VHF Antenna AS 3226B URC 7 1 Table 7 3 List of Manufacturers Valcom Manufacturing Group Inc CageCode 35736 Postal address Shipping address Valcom Ma...

Page 18: ... precautions when handling the antenna 8 4 FOUNDATION The antenna should be installed vertically on a mounting plate that has bolt holes matching those in the antenna base see Figure 8 1 The mounting plate must have a center hole to accommodate the transmission line to the antenna 8 5 INPUT REQUIREMENTS The antenna has an RF power handling capability of 800 watts in the 30 to 88 MHz frequency rang...

Page 19: ...n Data of the AS 3226B URC Antenna 8 7 INSTALLATION CHECKOUT Checkout of the antenna after installation can only be accomplished by operating the ship s receiving and transmitting equipment that is used with the antenna Valcom Manufacturing Group Inc 15 ...

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