Furuno 841 MARK-2 manual Holes for antenna unit, Parallel with the fore and aft line

Mounting platform

Holes for antenna unit:

The mounting surface must be parallel with the waterline and provided with five holes whose dimensions are shown in the outline drawing attached at the end 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

CABLE

ENTRY

FLAT WASHER SPRING WASHER M10 x 25 HEX BOLT

SHIP'S BOW

4-φ12 HOLES

PLATFORM

parallel with the fore and aft line.

Figure 5-4 Antenna Unit, cover removed

3. Prepare a platform 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. See Fig-

ure 5-1.) 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.

Fasten the radome base to the mounting plat-

Effective thread length

25 mm

Flat washer

Antenna base plate

Packing

Radome

5 - 10 mm

form with four each of M10 x 25 hex bolts,

flat washers and spring washers.

Mask size;

φ70 to φ 125 mm

Type: OP03-92

Code no.: 008-445-070

Figure 5-3 Assembling the sailboat mast

mounting bracket (option)

Spring	Platform
washer	M10 x 25
Apply silicone sealant
	Hex bolt

Figure 5-5 How to fasten the radome base

to the mounting platform

Wiring and final preparation

4.Drill a hole of at least 20 millimeters diam- eter through the deck or bulkhead to run the signal cable between the antenna unit and the display unit. (To prevent electrical inter- ference avoid running the signal cable near other electrical equipment and in parallel with power cables.) Pass the cable through the hole. Then, seal the hole with sealing compound for waterproofing.

5.Remove two shield covers in the radome.

6.Remove the cable clamping plate by unfas- tening four screws and removing a gasket.

Pan head screws

M4x8 4 pcs.

Cable clamping plate

Pan head Shield cover

screws Gasket M4x8 7 pcs.

Shield cover

Pan head screws M4x8 7 pcs.

Figure 5-6 Antenna unit, inside view

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