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Old 15 April 2007, 14:42   #1
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Garmin fishfinder transducer doesn't like Duoprop

My Garmin 240 fishfinder doesn't like my Volvo duoprop.

Saying that, at certain RPM the fishfinder stops working. It's pretty annoying since I can't tell how much water I havre under me. I can only presume that it's the turbulance from the duoprop.

What alternatives have I here? A thru-hull/in-hull transducer? Are they expensive and do they work at speed? I don't really want to go down the through-hull transducer as I dont like drilling holes in my hull, so would be more interested in getting info about an in-hull transducer

Thanks in advance!
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Old 15 April 2007, 15:55   #2
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I presume the transducer is mounted on a transom bracket. If so, take it off and stick it inside the engine compartment with a big dod of silicon sealer. Make sure there are no air bubbles between the transducer and the hull.
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Old 15 April 2007, 19:08   #3
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Quote:
Originally Posted by jwalker View Post
I presume the transducer is mounted on a transom bracket. If so, take it off and stick it inside the engine compartment with a big dod of silicon sealer. Make sure there are no air bubbles between the transducer and the hull.
Sorry forgot to mention that it's a transom mounted transducer that I have, yeah.

OK so you're saying that I should take that transducer and stick it to the bottom of the bilge with silicone? What about the angle of the 'V', will that have an effect?!
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Old 15 April 2007, 19:24   #4
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What about the angle of the 'V', will that have an effect?!
I've got mine on the side of the V at the bottom, forward of the engine. Just chock it up level while the silicon is setting.
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Old 17 April 2007, 15:05   #5
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I fitted mine to the inside of the hull with Sikaflex and it seemed to work fine. I think the key whatever you do is to ensure there are no air bubbles in the Silicon (or Sikaflex). Take the nozzle off the tube of sealant and put a good amount on the face of the transducer. Pressing transducer firmly to hull will then ensure there are no air gaps.

I believe the recommended approach is to bed it in epoxy resin but I was standing next to the transducer with my sikaflex gun and thought I'd give it a go!
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Old 17 April 2007, 15:52   #6
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Interesting! I presume you had to level the transducer?
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Old 17 April 2007, 18:08   #7
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In my case I mounted it in the rear well on a piece of hull just off centre so it was pretty level anyway. I did kind of level it out in the sealent so it was parallel to water surface. To be honest, I don't think it has to be spot on level tho - if you consider that it works well when the boat is rolling. I think the transmission pattern is quite wide anyway. I guess the straighter the transducer, the better the range.

I tried mine in various positions just by filling the well up with water. I believe you can also put the transducer in a plastic bag full of water and place it against the hull at various points untill you get a good reading (the important thing being that there is no air gap between the transducer and hull.
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Old 19 April 2007, 05:27   #8
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The old trick on yachts with echo sounders used to be to run the transducer in a container filled with linseed oil that was glued to the inside of the hull. Don't know how well it'd work with a transom mounted transducer though-you might have to replace with a through-hull type.
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Old 19 April 2007, 11:55   #9
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Nos;

I don't think there's all that much difference between a shoot-through and a transom mount transducer except the physical package. The actual guts are at least pretty similar, if not identical. They should both shoot through fiberglass fine, as long as you don't have air bubbles in whatever it's sitting in (oil or caulk or glue or whatever.)

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Old 19 April 2007, 14:08   #10
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AFAIK the insides are identical too-but I can see it being a PITA to try and mount a transom mount transducer inside a bottle and keep it at the right angle.
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