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post #1 of 3 Old 04-08-2004 Thread Starter
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tranducer installation

I need to install a transducer (depth) but I don''t want to put another hole in my boat. So I''m planning on using an in-hull unit. The folks at Garmin say I must use a dual frequency xducer, although I''m not convinced I need the lower (50khz) in shallow coastal areas where I sail. Also, since my full-keel boat is devoid of any level hull area, any suggestions for getting a relatively vertical mount?
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post #2 of 3 Old 04-08-2004
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tranducer installation

You can purchase 200Khz in-hull transducers that are designed to allow compensation for mounting on a slant. In-hull mounting does require mounting on a non cored area of the hull (i.e. solid glass) If your hull is cored, you must cut through the core material to obtain a suitable surface for the transducer to "look" through.

50 KHz transducers provide a wider angle view of the bottom. They are usually used for fish finders. If you are only interested in depth with little interest in what the bottom looks like, the 200KHz only transducer should work OK.

West Marine has an in-hull transducer shown on page 125 of their 2003 catalog for $70.
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post #3 of 3 Old 04-09-2004
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tranducer installation

I may have to retract some of the previous information. It has occurred to me that your unit may need the load of the 50Khz transducer if the unit automatically switches back and forth from 200 to 50 Khz. If that is the case, without the 50Khz transducer load, the output circuitry may generate excessive heat and fail pre-maturely .
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