Furuno FR-2115/2125 - Manual (Page 9)

1-1
MOUNTING
1.1 Scanner Unit
Mounting considerations
• The scanner unit is generally installed either on top of the wheelhouse or on the
radar mast, on a suitable platform. Locate the scanner unit where there is a
good all-round view.
(a) On bridge (b) Common mast (c) Radar mast
Figure 1-1 Mounting methods
• No funnel, mast or derrick should be within the vertical beamwidth of the scan-
ner 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 scanner 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 scanner 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 placed too close to the scanner unit.
Observe the following compass safe distances to prevent deviation of a mag-
netic compass: Standard compass,1.70 m (FR-2115), 2.10 m (FR-2125), Steer-
ing compass, 1.90 m (FR-2115), 1.20 m (FR-2125).
• Do not paint the radiator aperture, to ensure proper emission of the radar waves.
• The signal cable run between the scanner and the display is available in lengths
of 15 m (standard), 20 m, and 30 m. Whatever length is used it must be unbro-
ken; namely, no splicing allowed.
• The scanner base is made of cast aluminum. To prevent electrolytic corrosion
of the scanner 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 scan-
ner unit must not be mounted where the temperature is more than 70
°
C.
• Leave sufficient space around the unit for maintenance and servicing. See the
scanner unit outline drawing for recommended maintenance space.