Mounting; Antenna Unit - Furuno FAR-2117 Installation Instruction

1. MOUNTING

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Antenna Unit

Mounting considerations
• The antenna unit is generally installed either on top of the wheelhouse or on the radar
mast, on a suitable platform. Locate the antenna unit where there is a good all-round
view.
• No funnel, mast or derrick should be within the vertical beamwidth of the antenna unit in
the bow direction, especially zero degrees
on the radar picture.
• It is rarely possible to place the antenna unit where a completely clear view in all
directions is available. Thus, you should determine the angular width and relative bearing
of any shadow sectors for their influence on the radar at the first opportunity after fitting.
• Locate a direction finder antenna clear of the antenna unit to prevent interference to the
direction finder. A separation of more than two meters is recommended.
• To lessen the chance of picking up electrical interference, avoid where possible routing
the signal cable near other onboard electrical equipment. Also avoid running the cable in
parallel with power cables.
• A magnetic compass will be affected if the antenna unit is placed too close to the
magnetic compass. Observe the compass safe distances on page ii to prevent deviation
of the magnetic compass.
• Do not paint the radiator aperture, to ensure proper emission of the radar waves.
• The signal cable run between the antenna and processor units is available in lengths of
15 m (standard), 30 m and 50 m. Whatever length is used it must be unbroken; namely,
no splicing allowed.
• The antenna base is made of cast aluminum. To prevent electrolytic corrosion of the
antenna base, use the seal washers and corrosion-proof rubber mat and ground the unit
with the ground wire (supplied).
• Deposits and fumes from a funnel or other exhaust vent can adversely affect the aerial
performance and hot gases may distort the radiator portion. The antenna unit must not be
mounted where the temperature is more than 55°C.
• Leave sufficient space around the unit for maintenance and servicing. See the antenna
unit outline drawing for recommended maintenance space.
5°, to prevent blind sectors and false echoes
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