Furuno FAR-2157 - Manual (Page 9)

1-1
1. MOUNTING
1.1 Antenna Unit
Mounting considerations
The antenna unit is generally installed either on top of the wheelhouse, on the radar mast, or on
a suitable platform. The mounting location should afford a good all-round view and satisfy the
siting and mounting considerations mentioned below.
Siting
• No funnel, mast or derrick should be within the vertical beamwidth of the antenna unit in the bow
direction, especially zero degrees ±5°, to prevent blind sectors and false echoes on the radar
picture.
• Deposits and fumes from a funnel or other exhaust vent can adversely affect the aerial perfor-
mance and hot gases may deform the radiator. The antenna unit must not be mounted where
the temperature is more than 70°C.
• Locate a direction finder antenna clear of the antenna unit to prevent interference to the direc-
tion finder. A separation of more than two meters is recommended.
• Choose a location where reflections from the radar reflector will not be received by the radar
antenna.
• The "standard" antenna unit orientation has the cable glands directed toward the bow.
• Leave sufficient space around the unit for maintenance and servicing. See the antenna unit out-
line drawing for recommended maintenance space.
Mounting
• Use rope and crane to hoist the antenna unit to the mounting location. Lifting fixtures are pro-
vided on the antenna chassis to which to fasten rope.
• Mount the unit parallel to the waterline.
• A hole is required in the mounting platform for the antenna cable.
• An appropriate platform should be constructed at the mounting location to facilitate installation
and maintenance work.
• Connect ground wire between antenna terminal on antenna chassis and ground point.
• If the mounting platform is made of steel paint it to prevent electrolytic corrosion. DO NOT paint
the antenna radiator.
NOTICE
Do not apply paint, anti-corrosive sealant
or contact spray to coating or plastic
parts of the equipment.
Those items contain organic solvents that
can damage coating and plastic parts,
especially plastic connectors.