Tacktick intermittent knotmeter malfunction

[andyoeft]

Hi.. I've having pretty much the identical problem here. And, as a result of reading the recommended therapy, I purchased a brand new T911 Hull Speed transducer with the same results. Then I purchased a brand new T121 Hull Transmitter. The Hull transmitter is also connected to a Tacktick compass (which works and displays fine) BUT.. Speed when plugged into the boat rarely displays anything above 1 knot. When I test the T911 by either spinning or blowing on the wheel it only produces a speed when the wheel is spinning extraordinarily fast. Meaning I'm blowing on it full blast to produce any speed at all. After purchasing 2 brand new instruments to get the same result as before with the old.

Display is a T111. Using the display I've confirmed all normal settings for speed are as they should be. My current challenge is I need correct speed display for a regatta this coming weekend. Any help would be appreciated.