Manual Eagle FishMark 320 Fishfinder (page 23 of 92) (English)

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If the arch slopes up – but not back down – then the front of the trans-

ducer is too high and needs to be lowered. If only the back half of the

arch is printed, then the nose of the transducer is angled too far down

and needs to be raised.

NOTE:

Periodically wash the transducer's face with soap and water to re-

move any oil film. Oil and dirt on the face will reduce the sensitivity

or may even prevent operation.

SHOOT-THRU-HULL PREPARATION

The transducer installation inside a fiberglass hull must be in an area

that does not have air bubbles in the resin or separated fiberglass lay-

ers. The sonar signal must pass through solid fiberglass. A successful

transducer installation can be made on hulls with flotation materials

(such as plywood, balsa wood or foam) between layers of fiberglass if

the material is removed from the chosen area.

Epoxy the transducer to a solid portion of the hull.

For example, some (but not all) manufacturers use a layer of fiberglass,

then a core of balsa wood, finishing with an outer layer of fiberglass.

Removing the inner layer of fiberglass and the balsa wood core exposes

the outer layer of fiberglass. The transducer can then be epoxied di-

rectly to the outer layer of fiberglass. After the epoxy cures, the hull is

watertight and structurally sound. Remember, the sonar signal must

pass through solid fiberglass. Any air bubbles in the fiberglass or the

epoxy will reduce or eliminate the sonar signals.

Fill with epoxy

Inner hull

Epoxy to hull first

Outer hull

Flotation material

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Eagle FishMark 320 Fishfinder Manual

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