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Old 21 July 2011, 18:31   #11
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I'm not seeing it in that pic. Is it right next to your elephant trunk?
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Old 22 July 2011, 03:01   #12
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circled now.
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Old 22 July 2011, 05:04   #13
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Originally Posted by wavelength View Post
therin lies the problem one would think esp if as you say it sorts itself out afterwards. Humminbirds I have had never coped with speed and once they lost the plot as it were it took them a while to get their acts together again. Any air passing under the hull in disturbed water will destroy readings. Whereabouts exactly is the transducer?
I had much the same problem with my Humminbird on the old rib, over about 20 knots it more than likely wouldn't work at all and it was fitted about where that one is. I bust the bracket on mine in some kelp and IIRC it was a bit (more) intermittent (than usual) and then fell off completely so I made a new metal bracket for it but seem to remember it was a bit cranky getting the angle right on the new bracket so it might have had a knock and be pointing back a bit.

In-hull transducer, that's the answer to all problems
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Old 22 July 2011, 06:51   #14
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it makes sense now the bracket is perhaps weak or getting a tweak now under way. when it first occured the back end got a bit of a knock when coming off a ferry wave. not enough to jolt me/boat but certainly enough to upset the angle of this thing perhaps given where it is.

i have never had a problem before at anyspeed reading depth so i'll go have a look at it tonight and get some more pics if i don't see anything obvious.

is there a set angle range for these to work within?

thanks for help mean time peeps.

cheers
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Old 22 July 2011, 12:55   #15
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is there a set angle range for these to work within?
Depending on the depth of the water it can be quite sensitive to changes in angle. Like when you are riding bow high and the transducer points "forward". Generally it should point straight down while underway AND while at rest. This requires a bit of fiddling and splitting the difference in practice.

Ther is about ~15degs of wiggle room on the angle, because that's how big the signal cone is. If a signal is not being returned from the bottom because its "skipping" off the bottom at an angle the unit will flash nonsense or read a very very shallow or over-range depth (I have gotten both bogus signals from my Humminbird).

The plastic bracket on the transducer has two nubs on the inside. The actual sensor is supposed to break free and swing up on impact with an object. If those nubs are worn it won't stay snapped back down though.
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