COBHAM Sea Tel Tracker 6000, Руководство по установке

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Sea Tel Tracker 6000 Site Survey – Land Based
2.3. Mounting Foundation
2.3.1. Mounting on a Concrete Pad
When installing the antenna on a concrete pad in a land based configuration, care should be
taken to locate the ADE away from surrounding buildings, towers, cranes or other structures
that will cause significant degradation of the signal when in direct line-of-sight between the
antenna and the LEO satellite it is tracking.
The ADE should be mounted on a contractor grade concrete pad with multiple attachment
points around the perimeter of the base frame to mount the ADE (refer to the Installation
Arrangement drawing for more information). The installation must allow acces through a
door in one of the side panels.
2.4. Below Decks Equipment Location
The Antenna Control Unit and other equipment that are standard 19” rack mount design should be
installed in one of these racks. Plan to allow access to the rear of the equipment in the rack.
The Satellite Receiver, router, computers and any other associated equipment should be properly
mounted per their design.
2.5. Cables
During the site survey, walk the path where the cables will be installed. Pay particular attention to
how cables will be installed; such as what obstacles they will be routed around, difficulties that will be
encountered and the overall length of the cables. The ADE should be installed using good electrical
practice. Sea Tel recommends referring to IEC 60092-352 for specific guidance in choosing cables
and installing cables onboard a ship. Within these guidelines, Sea Tel will provide some very general
information regarding the electrical installation.
In general, all cable shall be protected from chaffing and secured to a cableway. Cable runs on open
deck or down a mast shall be in metal conduit suitable for marine use. The conduit shall be blown
through with dry air prior to passing cable to ensure all debris has been cleared out of the conduit
and again after passing the cable to ensure no trapped moisture exists. The ends of the conduit shall
be sealed with cable glands (preferred), mastic or low VOC silicon sealant after the cables have been
passed through.
Cables passing through bulkheads or decks shall be routed through approved weather tight glands.
2.5.1. ADE/BDE Coaxial Cables
The first concern with the coaxial cables installed between the ADE & BDE is length. This
length is used to determine the loss of the various possible coax, Heliax or fiber-optic cables
that might be used. You should always provide the lowest loss cables to provide the
strongest signal level into the satellite modem.
Be sure that the shield(s) of the coaxes are not in contact with the ships ground.
The coaxes must be of adequate conductor cross-sectional surface area for the length of the
cable run and that the loop resistance of the cable run is less than 2.0 ohms. Copper clad
iron center conductor cables should never be used.
Signal cable shall be continuous from the connection within the ADE radome, through the
structure of the ship to the BDE. Splices, adapters or dummy connections will degrade the
signal level and are discouraged.
Be careful of sharp bends that kink and damage the cable. Use a proper tubing bender for
Heliax bends.
Penetrations in watertight bulkheads are very expensive, single cable, welded penetrations
that must be pressure tested.
Always use good quality connectors that are designed to fit properly on the cables you are
using. Poor quality connectors have higher loss, can allow noise into the cable, are easily
damaged or fail prematurely.
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EAR Controlled - ECCN EAR99