Furuno 1830 - Page 12

Scanner Unit Preparation;
After deciding the location of the Scannar Unit, preparation of the Scanner
Unit is necessary. Use the foUowing procedure.
1. O pen the radome package carefully. Remove the four MIO bolts together
with spring and flat washers on the bottom of the radome base assembly.
These bolts, spring and flat washers raay be discarded, but do not use
the bolts in step 4.
RADOME
]
- RADOME BASE
ASSY,
Fig.3 Preparing the Radome Base for Mounting
2. U n bolt the four fixing bolts used to hold the white radome cover to the
blue radome base and carefully lift the radome up. Remove the antenna
stoppers. This will release the antenna from its shipping preparation
position, and ailow it to rotate freely.
Fig-.4 Rcmoving the KaUoiiie Cover
^rvT^nTiCaæ
J_PW
T—SW
A— M
10 BOLT
Scanner Unit Mounting:
The mounting surface must be parallel with the ship’s waterline and
provided with six holes whose dimensions are shown in Fig.5; Four 12mm
(1/2") holes for fixing. one 27mm (1.1") hole for the cable entry, and one
20mm (3/4") hole for the vent tube.
There is a vent tube on the base of the Scanner Unit which should face the
stem direction. The unit is adjusted so that a target echo returned from
the bow direction will be shown on the 0° (Heading Marker) position on the
screen. When drilUng holes, take care that the holes are parallel with the
fore and aft line.
In very hot and huraid climates, moisture may condense inside the radome,
causing corrosion. To prevent this, the vent tube is fitted. This tube is
deaigned to allow the radome to "breathe" while not allowing entry of water
from outside into the radome. Therefore, make sure the tube is kept free
of foreign materiels and is not pinched or kinked. The vent tube extends
downward by 27mm (1.1") from the radome base. Ensure the vent tube
extends downward before installing the radome. See Fig.6.
3. N ow install the radome base on the platform having 5-lOmm (l/5"'2/5") in
thickness. Find the vent tube on the radome base. Next, position the
radome base so that the vent tube faces the stem direction. This
alignment should be carried out as accurately as possible-
8