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SAC "H" Helipad Manual

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SOUTHERN AVIONICS COMPANY
MANUFACTURERS OF LOW FREQUENCY RADIOBEACONS AND ASSOCIATED PRODUCTS
"H" Helipad Antenna
Manual #SD400008 Revision E
Printed
August 22, 2008
Box 5345 • Beaumont • Texas • 77726-5345 • USA • Phone (409) 842-1717 • Fax (409) 842-2987 • Email
sales@southernavionics.com
www.southernavionics.com

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  • Page 1 SOUTHERN AVIONICS COMPANY MANUFACTURERS OF LOW FREQUENCY RADIOBEACONS AND ASSOCIATED PRODUCTS “H” Helipad Antenna Manual #SD400008 Revision E Printed August 22, 2008 Box 5345 • Beaumont • Texas • 77726-5345 • USA • Phone (409) 842-1717 • Fax (409) 842-2987 • Email sales@southernavionics.com www.southernavionics.com...
  • Page 2 It applies only if the goods are submitted to normal use and service and does not apply if the goods are misused or mismatched with other goods such as antennas, couplers, or any other third party goods that have not been approved by SAC in writing for use with SAC equipment.
  • Page 3 Freight Costs: The Customer pays for freight costs to and from Southern Avionics Company. SAC will not be responsible for any loss or damage of any items in transit either to or from SAC. Expiration of Support: SAC supports all items manufactured by SAC for no less than ten (10) years from date of original purchase.
  • Page 4 SOUTHERN AVIONICS COMPANY MANUFACTURERS OF LOW FREQUENCY RADIOBEACONS AND ASSOCIATED PRODUCTS Box 5345 • Beaumont • Texas • 77726-5345 • USA • Phone (409) 842-1717 • Fax (409) 842-2987 • Email sales@southernavionics.com www.southernavionics.com...

  • Page 5: Table Of Contents

    SOUTHERN AVIONICS COMPANY Contents 1 Introduction ......................1-1 2 Planning ........................2-1 3 Installation ....................... 3-1 4 Tune Up........................4-1 5 Preventive Maintenance ..................5-1 6 Parts List........................6-1 Monitor Receiver Contents...
  • Page 6 SOUTHERN AVIONICS COMPANY Figures Figure 2-1 SQUARE HELIPAD WITH END FED ANTENNA WIRE ......2-3 Figure 2-2 SQUARE HELIPAD WITH CENTER FED ANTENNA WIRE ...... 2-3 Figure 2-3 HELIPAD OVERHANGING A PLATFORM WITH AN END FED ANTENNA WIRE..........................2-4 Figure 2-4 OCTAGON HELIPAD WITH END FED ANTENNA WIRE ......2-4 Figure 2-5 COUPLER INSTALLATION ON OFFSHORE PLATFORM GUARDRAILS 2-5 Figure 2-6 FINAL TIGHENING OF BANDS ..............

  • Page 7: Introduction

    SOUTHERN AVIONICS COMPANY 1 Introduction The SAC “H” (helipad) antenna is a low frequency radiobeacon antenna designed for installation around the perimeter of the helicopter landing decks of offshore platforms and drilling ships. The antenna is composed of 1/8”, 6x7 fiber core, phosphor bronze wire rope suspended on insulators approximately 7.5 feet (2.2 meters) outboard from the heliport deck.
  • Page 8 SOUTHERN AVIONICS COMPANY This page intentionally left blank. Introduction “H” Antenna...

  • Page 9: Planning

    SOUTHERN AVIONICS COMPANY 2 Planning The following factors should be considered when planning the location of the helipad antenna. The following figures show installation of antennas to various styles of helipads. 1. By using the following figures, and also the transmitter installation instructions, determine the suitability of mounting locations for the radiobeacon transmitter and antenna coupler.
  • Page 10 SOUTHERN AVIONICS COMPANY This page intentionally left blank. Planning H Antenna...

  • Page 11: Figure 2-1 Square Helipad With End Fed Antenna Wire

    SOUTHERN AVIONICS COMPANY Figure 2-1 SQUARE HELIPAD WITH END FED ANTENNA WIRE Figure 2-2 SQUARE HELIPAD WITH CENTER FED ANTENNA WIRE “H” Antenna Planning...

  • Page 12: Figure 2-3 Helipad Overhanging A Platform With An End Fed Antenna

    SOUTHERN AVIONICS COMPANY Figure 2-3 HELIPAD OVERHANGING A PLATFORM WITH AN END FED ANTENNA WIRE Figure 2-4 OCTAGON HELIPAD WITH END FED ANTENNA WIRE Planning H Antenna...

  • Page 13: Figure 2-5 Coupler Installation On Offshore Platform Guardrails

    SOUTHERN AVIONICS COMPANY Figure 2-5 COUPLER INSTALLATION ON OFFSHORE PLATFORM GUARDRAILS “H” Antenna Planning...

  • Page 14: Figure 2-6 Final Tighening Of Bands

    SOUTHERN AVIONICS COMPANY Figure 2-6 FINAL TIGHENING OF BANDS Planning H Antenna...

  • Page 15: Installation

    SOUTHERN AVIONICS COMPANY 3 INSTALLATION 1. Place each antenna insulator support pole on the helipad deck adjacent to the intended mounting location. 2.Attach each of the antenna insulator support poles to the appropriate safety net support post according to the following procedures. (See “Final Tightening of Bands”.) •...
  • Page 16 SOUTHERN AVIONICS COMPANY Note: As the support poles are lowered into place, additional wire may need to be unreeled from the wire coil. Note: If the antenna wire is end fed, the wire is pulled tight and fed directly to the insulator at the antenna coupler.

  • Page 17: Figure 3-1. Bushing Installation

    SOUTHERN AVIONICS COMPANY Figure 3-1. BUSHING INSTALLATION “H” Antenna INSTALLATION...

  • Page 18: Figure 3-2. "H" Antenna Insulator Installation

    SOUTHERN AVIONICS COMPANY “h Figure 3-2. “H” ANTENNA INSULATOR INSTALLATION INSTALLATION “H” Antenna...

  • Page 19: Figure 3-3. Lowering Insulator Pole Assembly

    SOUTHERN AVIONICS COMPANY Figure 3-3. LOWERING INSULATOR POLE ASSEMBLY Figure 3-4. INSULATOR POLE ASSEMBLY “H” Antenna INSTALLATION...
  • Page 20 SOUTHERN AVIONICS COMPANY 17. Attach the feed insulator to the antenna coupler using the insulator mounting bracket. 18. Pass the antenna wire thought the insulator clevis and around the wire thimble. Take up excess slack in the antenna wire, bend the wire back, and secure the antenna wire with the antenna lead with 2 split blts.

  • Page 21: Tune Up

    SOUTHERN AVIONICS COMPANY 4 TUNE-UP Tune-up of the transmitter to the helipad antenna is performed according to the procedure listed in the transmitter manual for tune-up to an unknown antenna. The initial tap selection may be an intermediate value between that listed for the 90 Foot Tower antenna and that of the Symmetrical “T”...
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  • Page 23: Preventive Maintenance

    SOUTHERN AVIONICS COMPANY 5 PREVENTIVE MAINTENANCE 1. Maintain all insulator surfaces of the antenna and antenna coupler free of all contamination, salt spray, and paint. Any contamination on the insulator will cause reduced reception range of the radiobeacon signal, turning problems and broadband RFI, especially during damp weather. As required, the insulators should be cleaned by first turning off the radiobeacon and then cleaning the insulators with fresh water.
  • Page 24 SOUTHERN AVIONICS COMPANY This page intentionally left blank. PREVENTIVE MAINTENANCE “H” Antenna...

  • Page 25: Parts List

    SOUTHERN AVIONICS COMPANY 6 PARTS LIST SLF10022 Assembly 20089064 BOLT HEX HD MACH 3/8-16X2 SS (RC) 2088D048 BOLT HEX HD MACH 1/2-13X1-1/2 GALV (RC) 21009000 NUT HEX 3/8-16 SS 218D0000 NUT HEX 1/2"-13 HOT DIP GALVANIZED STEEL (RC) 22009000 WASHER FLAT 3/8 SS (RC) 22019000 WASHER SPLIT LOCK 3/8 SS (RC) 2280A000...
  • Page 26 SOUTHERN AVIONICS COMPANY This page intentionally left blank. PARTS LIST “H” Antenna...

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