Manual Lowrance LMS-337C DF (page 24 of 216) (English)

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usually give you the best combination of smooth water flow and protec-

tion from bangs and bumps.

Align transducer centerline with hull bottom.

However, there are times when you may need to adjust the transducer

slightly higher or lower. (The slots in the mounting brackets allow you

to loosen the screws and slide the transducer up or down.) If you fre-

quently lose bottom signal lock while running at high speed, the trans-

ducer may be coming out of the water as you cross waves or wakes.

Move the transducer a little lower to help prevent this.

If you cruise or fish around lots of structure and cover, your transducer

may be frequently kicking up from object strikes. If you wish, you may

move the transducer a little higher for more protection.

There are two extremes you should avoid. Never let the edge of the

mounting bracket extend below the bottom of the hull. Never let the

bottom – the face – of the transducer rise above the bottom of the hull.

Shoot-thru-hull vs. Transom Mounting

In a shoot-thru-hull installation, the transducer is bonded to the inside

of the hull with epoxy. The sonar "ping" signal actually passes through

the hull and into the water. This differs from a bolt-thru-hull installa-

tion (often called simply "thru-hull"). In that case, a hole is cut in the

hull and a specially designed transducer is mounted through the hull

with a threaded shaft and nut. This puts the transducer in direct contact

with the water.

Typically, shoot-thru-hull installations give excellent high speed opera-

tion and good to excellent depth capability. There is no possibility of

transducer damage from floating objects, as there is with a transom-

mounted transducer. A transducer mounted inside the hull can't be

knocked off when docking or loading on a trailer.

However, the shoot-thru-hull installation does have its drawbacks.

First, some loss of sensitivity does occur, even on the best hulls. This

varies from hull to hull, even from different installations on the same

hull. This is caused by differences in hull lay-up and construction.

Transom

Hull bottom

Transducer

centerline

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Lowrance LMS-337C DF Manual

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