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1.4 Mounting the Antenna Unit of MODEL1833C-BB
Mounting considerations
See the mounting considerations for the MODEL1823C-BB on page 1-5.
The compass safe distance of 0.90 meters (standard compass) and 0.70 meters (steering
compass) should be observed to prevent deviation of the magnetic compass.
Mounting the antenna unit of MODEL1833C-BB
1. Open the antenna unit packing box carefully.
2. Unbolt the four bolts at the base of the radome cover to remove it.
Radome cover
Antenna unit
The mounting surface must be parallel with the waterline and provided with five holes (four
fixing holes and one cable entry) whose dimensions are shown in the outline drawing
attached at back of this manual.
The unit is adjusted so a target echo returned from the bow direction will be shown on the
zero degree (heading line) position on the screen. When drilling holes, be sure they are
parallel with the fore and aft line.
3. Prepare a platform (wood, steel*, or aluminum) of 5 to 10 millimeters in thickness for the
antenna unit.
A mounting bracket for mounting the antenna unit on a sailboat mast is optionally
available. (Refer to page 1-17.) Find the cable entry on the radome base. Next, position
the radome base so the cable entry faces the stern direction. This alignment must be as
accurate as possible.
*: For steel platform, take appropriate measures to prevent corrosion.
Flat washer
Spring washer
M10 x 25 Hex bolt
Platform
4- 10 Holes
Cable
entry
Ship's bow
Cable entry hole
(approx. 20)