Strange signals from echosounder

[Arrandir]

I have a Silva echosounder which send the signal through the hull from a waterfilled cylinder. It is connected to a simple display which just show the depth.

A while ago it started to just give readings once in a while. When I put the transmitter in the water it gave signals without problems. I thought maybe growth on the hull was the problem.

Now the boat have been on the hard and there's no growth. Usually I don't get any readings, but sometimes it can show 20 or even 120 meters in a shallow marina.

I have checked all connections so there are no corrosion on them. Is it something more to do before buying a new transmitter and display?

[Bill O]

Is there enough water in the cylinder? Needs at least enough water to keep the working end of the transducer fully submerged.

Is your hull solid f/g or cored? What boat do you have? The d/f will not work well through a cored hull.

In your marina, is the bottom mud? Sometimes in muddy bottoms inaccurate or no readings may occur.

[Spot]

Hello Arrandir,
Are you still on the hard or back in the water?

[Arrandir]

Sorry for late reply due to many other things to do on the boat.

The boat is in the water on a muddy bottom, I will check again when the boat is over another bottom.

There is enough water in the cylinder, the same amount as usual. The hull is solid. I have an OE 32.