knot / log display - SailNet Community
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post #1 of 4 Old 05-30-2012 Thread Starter
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knot / log display

Hi all.

Because we have good display of the boat speed over the ground with our GPS, I have not worried much about fixing / replacing the not working old Kenyon analog speed / log display.

I am at home and so cannot be more specific, but, she seems to have a brand new thru hull unit. Other than purchasing a display and trying it, what is eh likelihood of a display (not the old brand that is in there) working with eh thru hull? Are they all propitiatory or do they pretty much put out the same data?

Sorry for such a simple minded question.

Rik

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post #2 of 4 Old 05-30-2012
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Re: knot / log display

The chance of a new display unit working with your old Kenyon transducer is basically zero. Other than the newer ones that output a standard NMEA signal, I think they are different from manufacturer to manufacturer.
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post #3 of 4 Old 05-30-2012 Thread Starter
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Re: knot / log display

Thanks Jim - the funny thing is that it looks like a brand new modern transducer.

Who know?

I wonder if there is a way to test the output?

Rik

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Re: knot / log display

Most of the newer sensors output a digital pulse signal. The paddlewheel blade passing a hall effect device in the body produces a pulse and this frequency varies with the speed of rotation. The display measures the frequence and then displays in knots. You could look at that signal with and oscilloscope. I suspect an old analog system would produce a voltage that varied with speed. A basic voltmeter could check that.
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