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Sonar troubleshooting question

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  • Garyak
    replied
    I guess it is possible, but I doubt it. Everything is secured and protected throughout the cable run...certainly nothing flopping around.

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  • Frostbitten
    replied
    Is it possible that the transducer cable has been damaged somewhere due to vibration, chafing etc?

    Leave a comment:


  • Garyak
    replied
    Originally posted by DRIFTER_016 View Post
    Mine is closer than yours and I get readings at full speed so the paddle wheel is not your issue.





    Check under the boat for any strakes or chines anywhere close to the path the water takes passing under the hull.
    Most likely culprit is air travelling along the bottom of the hull. Moving the transducer further inboard may very likely rectify the issue.
    The boat has a flat clean bottom..no strakes or anything else down there. The inboard edge of the transducer is 14 1/8 inches from the center line of the lower unit. I was concerned that mounting it too far inboard might have an effect on the prop function...but I don't know if that is even a concern. How much further inboard do you think I could/should move it? It was installed per instructions guidelines but I suppose there can always be variables to consider. I'm appreciating everyone's input!

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  • cod
    replied
    Originally posted by Garyak View Post
    I installed it at the same time as the 'ducer so I've had the issue from day 1. I have exactly 2 inches I could move it outboard before the hull begins to upsweep...and even further if mounting it on the upsweep wouldn't hurt anything...but it would likely be out of the water during turns.


    In looking at your pics.... Probably NOT the problem. I thought the wheel would be bigger than what your pic shows. Don't think that little thing could cause enough turbulence.


    looking at your pics.... Probably NOT the problem. I thought the wheel would be bigger than what your pic shows. Don't think that little thing could cause enough turbulence.

    Leave a comment:


  • BrownBear
    replied
    Originally posted by kodiakbound View Post
    ...started flaking....
    Something just wiggled my memory gland, Kevin....

    Maybe too basic, but did you use dieiectric silicone grease on the plug between the unit and the transducer wire? I wasn't doing that a few years back and developed symptoms similar to yours- complete blackout on step. Cleaned the terminals and added the dielectric goop, and no problems since.

    Leave a comment:


  • DRIFTER_016
    replied
    Mine is closer than yours and I get readings at full speed so the paddle wheel is not your issue.



    If you've had the issue from day one it is most likely one of two things. A defective/weak transducer or the location of the transducer on the back of the boat.
    Check under the boat for any strakes or chines anywhere close to the path the water takes passing under the hull.
    Most likely culprit is air travelling along the bottom of the hull. Moving the transducer further inboard may very likely rectify the issue.

    Leave a comment:


  • Garyak
    replied
    Originally posted by cod View Post
    Absolutely. Is that a 'new' addition? If so, almost guarantee that's your prob.
    I installed it at the same time as the 'ducer so I've had the issue from day 1. I have exactly 2 inches I could move it outboard before the hull begins to upsweep...and even further if mounting it on the upsweep wouldn't hurt anything...but it would likely be out of the water during turns.

    Leave a comment:


  • cod
    replied
    Absolutely. Is that a 'new' addition? If so, almost guarantee that's your prob.

    Leave a comment:


  • Garyak
    replied
    I agree, cod...when participating, the sonar seems to work fine. I went ahead and adjusted it up a notch. As I recall that really messed things up while at rest but I'll give it a shot. I also have a paddle wheel down there. It is 3 1/4 inches from the edge of the 'ducer to the edge of the paddle wheel. Do you think that could be close enough to cause a problem?

    Leave a comment:


  • cod
    replied
    Transducer angle doesn't have to change very much at all to lose signal. The fact u have signal and then lose it as u speed up leads one to believe that u are either getting cavitation bubbles under it or when on step your hull angle ( and thus your transducer angle) has changed enough to lose signal. Generally when accelerating your hull angle will become steeper. When on step it will flatten a bit. It may be the 'flattening' of the angle that is causing signal lose. Try adjusting just enough to compensate for it.
    Since u do get signal, I would have to believe nothing's wrong w the sonar.
    Let us know what u find.

    Leave a comment:


  • kodiakbound
    replied
    Thanks for all the replies. I didn't find anything that jumped out at me. It didn't look like the angle had changed or the transducer had been struck or moved any. Nothing on the bottom that should cause any turbulance. I did make a small angle change but have not had a chance to test on the water yet, kids have been keeping me busy!!!

    Leave a comment:


  • tzieli22
    replied
    In upgrading my electronics this year I was informed that transducers do go bad. A bit disappointing given you can spend thousands of dollars on them, but then again, not much out there that works for ever. Might want to call lowrance to see how you might test it. That is as long as nothing has changed on your hull to give you turbulence.

    Leave a comment:


  • Garyak
    replied
    Originally posted by cod View Post
    Yep, or the tranducer angle has changed.
    I have a problem similar to kodiakbound's with my Lowrance LMS 527-CDF transom mount transducer. I lose sonar at only 10 mph but have to drop down under 5 mph to reacquire. The 'ducer is undamaged and clean as is the hull which has a flat bottom...I've adjusted the angle both up and down and find the sweet spot..which isn't sweet at all.. to be where it was initially installed. ???

    Leave a comment:


  • cormit
    replied
    If your transducer is a transom mount ...... it is always possible to hit something in the water that is unseen. Even a slight change in transducer angle can spoil a clean signal.

    Leave a comment:


  • kodiakbound
    replied
    I'll give things a good look over today. Thanks for the tips!

    Leave a comment:

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