Lowrance electronic X515C DF Manuale Utente

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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 con-

tact 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. 
Second, the transducer angle cannot be adjusted for the best fish 

arches on your sonar display. (This is not an issue for flasher-style