Depth sounders and Old transducers

Kolbads

Cadet
Joined
Dec 21, 2022
Messages
12
I bought a 1983 26' sedan cruiser on a trailer. It needs lots of work, but my plan right now is to get it seaworthy enough to launch and see how it feels, then decide how much time/money to put into it. I want to have a depth sounder before I launch.

I know approximately nothing about depth sounders transducers or displays. There are three old in-hull transducers installed. (I assume that's what they are. See pics.) One of them (pictured) still has coax cable running forward to the helm, but no display. On the outside of the hull there is a hockey puck shape and size, seamlessly mounted to the hull. Strangely, this transducer is mounted only 3 inches inboard of the chine and nearly vertical side of the hull. A poor location from what I understand.

There is an identical looking transducer mounted on the bottom centreline about two feet forward of the transom. Its cable has been cut off one inch from the top of the brass(?) rod. On the outside of the hull there is a home-plate shaped "puck" about one inch deep.

There is a third transducer, installed differently, with the cable cut off (pictured). It is also located just inboard of the chine about two feet aft of the first, with no protrusion on the outside of the hull.

There is also a cable with a four-pin connector on the inboard end; it is terminated at the transom at the other end, so presumably was for a transom mount which has been removed.

At this stage, I'm trying to buy used equipment online to get the boat launched cheaply but safely. Can anyone identify the transducers and say whether a compatible display head might still be found?

Or recommend a cheaper way to have a depth sounder for the initial launch? (More convenient than a lead and line, that is 😆!) Thank you in advance!
 

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Kolbads

Cadet
Joined
Dec 21, 2022
Messages
12
PS: There is no display or electronics of any kind onboard. Apart from a depth readout, I don't plan to have any for initial launch.
 

dingbat

Supreme Mariner
Joined
Nov 20, 2001
Messages
15,963
One looks like a speed sensor…..

Plan on writing them off and start over.

Sonar doesn’t use coaxial. They use multi-conductor cabling and specialized connectors specific to the display head.

It would cost more to “repair” than to start over from scratch with a new unit
 
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