Transducer placement

BarryYLouisville

Need a little bit of help on transducer placement.  I have a Raymarine A80350 CPT 120 bronze thru hull transducer.  It worked fine for several weeks (on Lake Barkley and Ohio River).  It now reads depth and down-vision/sonar at low RPM's but as soon as I get some speed it does not work.  I'm thinking it might be attached to the boat in the wrong area where it gets bubbles all around it at hi-speed or maybe it just got marine growth and that is causing it to malfunction.  Anybody have any ideas ?

Handymans342

Where is it now?

MarkB

What kind of speed are you talking about when it stops working?  And does it still track bottom, or not even that?

howardrams

BarryY, Mine actually stops working once enough slime, algae, and mussels cover it.  Scrub them off and it's fine.  Sounds like yours is a through-hull type, so it's location should be about 2 feet forward of the transom, and about a foot off the center line of the boat, generally on a level spot in the engine compartment.

randy56

Barry, mine also got more slime build up when I was at Barkley earlier this year in a month, more than 5 weeks in the river, Strange when at Lake Barkley for a month was worse,  I had pulled the boat out of the river after 5 weeks to clean up and do some maintenance. Had less scum on it. You would think the river was dirtier.
Maybe you can jump in and clean it.

BarryYLouisville

I bet cleaning fixes it.  It is about 4 feet up from the transom and maybe a foot or 8 inches off center.  It is a thru the hull transducer.  I wonder if 4 feet up from the transom is too far and it gets bubbles as I hit plane.  I'd say the speed it stops working (depth, downvision, and sonar is 20 mph).  I think cleaning it is a good idea.  (Will have to try to do this at anchor on Ohio - sounds tricky)