Quote Originally Posted by luvjign View Post
OK transducer experts, I need some help. I replaced a Hummingbird finder on my console with a Eagle Fishmark 480. I know that the manual calls for mounting the transducer where the midway point is in line with the bottom of the hull. I've ran these same transducers on jon boat transoms with no problem. This one is mounted in the same exact place as the HB transducer. The problem is, after 10 mph, it loses the signal, and you know what happens then. It's a Tracker, and it has what Cane Pole probably was asking about on another thread (step hull), and it does rob the bottom of the transom in the transducer area of water that normal hulls don't have. I've moved it up about 1/2" and down about 1/2" with no results change. Looks like I may need to either modify the exsting bracket to go either way any more, or drill more holes. You fellas got a clue as to why I'd need to go lower than this, given the HB transducer wasn't that low??
PanManVa and I both had this same problem. I raised the nose of the xducer 1 click above level and adjusted down as low as I could get it. Helped till about 25mph. It is air bubbles.

Had similar problem with 797 transducer. I made a deflector plate out of tupperware. Fixed it.

Good luck

Tom