Furuno FS-1575 Installation Manual page 12

Outdoor installation
• The coupler is water-jetsproof, but is not designed to take a continual soaking. If necessary,
cover the top and sides with a wooden housing (or similar enclosure) or by sealing any opening
in the top or sides with silicone sealant.
• Keep wires as short as possible and keep the wires away from any grounded conductors such
as lifelines, mast shrouds, or fittings.
• Locate the insulator away from funnels, etc.
1.2.2 Ground
The ground connection must have the lowest possible RF-impedance. Losses in the ground con-
nection reduce the communication distance.
Make the ground connection to the Antenna Coupler with a copper strap, constructed as shown
below. For vessels with conducting hulls, make the width at least 60 mm and the length not
more than one meter. For FRP vessels, make the width at least 60 mm and the length not more
than five meters.
Connect to the ground termnaml of the
antenna coupler.
Solder
For outdoor installation, apply a coat
of marine paint to prevent corrosion.
For outdoor installation, do the following.
• Coat the junction where the copper strap connects to the ground terminal of the antenna coupler
with silicone sealant.
• Coat the copper strap between the ground plate and ground terminal of the anntenna coupler
with marine paint to prevent corrosion.
• Add a supplemental ground wire (local supply, more than 14 sq) and fasten it to the ground ter-
minal of the antenna coupler as shown below.
Copper strap
CAUTION CAUTION
Ground the equipment.
Ungrounded equipment can
give off or receive electro-
magnetic interference or
cause electrical shock.
Copper strap
Ground terminal of the antenna coupler.
1. HOW TO INSTALL THE SYSTEM
Ground plate
(a piece of steel plate)
Braze
Fasten the supplemental
ground wire (more than
14 sq).
4
Weld to ship's structure