1-1
1.
MOUNTING
1.1
Antenna Unit
1.1.1
Mounting considerations
• The antenna unit is generally installed either on top of the wheelhouse or on the ra-
dar mast, on a suitable platform. Locate the antenna unit in an elevated position to
permit maximum target visibility.
• No funnel, mast or derrick should be within the vertical beamwidth of the antenna in
the bow direction, especially zero degrees ±5°, to prevent blind sectors and false
echoes 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 the antenna of a direction finder clear of the antenna unit to prevent interfer-
ence 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 a power cable.
• A magnetic compass will be affected if placed too close to the antenna unit. Observe
the compass safe distances shown on page ii to prevent deviation of a magnetic
compass.
• Do not paint the radiator aperture to ensure proper emission of the radar waves.
• 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 ae-
rial 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 an-
tenna unit outline drawing for recommended maintenance space.
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.
NOTICE
Summary of Contents for FR-1908V-BB
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