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Depth finder doesn't read past idle speed

Old 03-25-2007, 09:58 AM
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Default Depth finder doesn't read past idle speed

I just put all new electronics in my boat. I had a Lowrance X126DF depth finder which is a mid tier monochrome unit along with the Airmar tilted element thru hull transducer. With this set up I was able to read depth at 50+ MPH. I now have a new Lowrance X515cDF depth finder with the same Airmar ducer and for some reason it won't read depth past idle or slow speed. As soon as I hit the throttles I lose depth even before the boat gets on a plane and the depth won't appear again until I am completely off plane.

I tried changing the settings to get a different result but with no change. I even read the instruction book and it didn't tell me anything except that it may be noise intrusion. But I didn't alter anything in the boat other than swapping out the display. Am I missing something?
Old 03-25-2007, 10:09 AM
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Default Re: Depth finder doesn't read past idle speed

Can we assume that the transducer is in the same place or was it moved? Anything else in the external environment of the hull that was changed that might be creating turbulence that wasn't there before. If it is a transom mount transducer, is there any chance it may have kicked up for some reason and is not in its normal orientation?
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Old 03-25-2007, 10:50 AM
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Default Re: Depth finder doesn't read past idle speed

Ther ducer is an Airmar thruhull ducer. Its in the hull and has not been moved. Nothing was changed except the display. I can only assume that is some setting in the display that I am missing. The new unit is a much better quality DF than the old one that was reading at 50+ MPH. For it to lose depth at anything over 6-8 MPH is very odd.
Old 03-25-2007, 12:02 PM
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Default Re: Depth finder doesn't read past idle speed

I would plug the old unit back in and verify operation, if it is still good then you know for sure nothing has changed with the ducer and the problem is the new unit or a setting.
Old 03-25-2007, 01:56 PM
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Default Re: Depth finder doesn't read past idle speed

Call Irene at Airmar 603-673-9570. She can tell you if there might be an incompatibility between your new unit and the transducer. She was very helpful when I had a problem.
Old 03-26-2007, 08:37 AM
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Default Re: Depth finder doesn't read past idle speed

I verified the compatibilty between the new display and the ducer which is also pretty new before I bought the new unit. After playing with it at the dock I did notice that the sensitivity was all the way up. The screen has much less clutter now and the bottom is more defined. I'll have to take out for a fast run to test it out.
Old 03-26-2007, 09:39 AM
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Default Re: Depth finder doesn't read past idle speed

with the boat drifting (and presumably the depth finder working accurately) rev the engines up to the same rpm you were at when you had problems while running, but with the boat out gear this time. If the unit goes schizo again, you are chasing a RF noise problem, not a turbulence issue.
Old 03-26-2007, 03:36 PM
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Default Re: Depth finder doesn't read past idle speed

In Shermans' "Powerboat Guide to Electrical Systems" he attributes some sounder problems to high voltage spikes from the charging system.

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