Furuno FS-1503 - Manual (Page 10)

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1.2 Mounting of Antenna Coupler
The antenna coupler is installed between the antenna and the transceiver, and tunes the antenna
to the transmitter.
Mounting considerations
The splashproof construction of the antenna coupler permits installation indoors or outdoors.
When selecting a location, keep in mind the following points:
• All wires from the coupler to the antenna radiate radio energy. Keep wires as short as pos-
sible and routed away from any grounded conductors such as lifelines, mast shrouds, or
fittings.
• For optimum radio energy, locate the coupler close to the antenna base and as near to the
ground as possible.
• For outdoor installation, be sure to select a place where the coupler will not take a con-
tinual soaking. If necessary, cover the top and sides with a wooden housing or by sealing any
opening in the top or sides with silicone sealant.
• For indoor installation, locate the coupler away from GPS and SATNAV receivers and
radio equipment to avoid mutual interference. The lead-in wire should be as near to the
coupler as possible.
• Select a place where the coupler can be easily maintained, but where it will not interfere with
crew or passengers.
• Leave sufficient space around the sides of the coupler for maintenance and checking.
• Observe the compass safe distance listed in the Safety Instructions to prevent deviation of a
magnetic compass.