Sounder transducer fitting

[johnphilip]

I am fed up with blank lines where the depth reading should be and having exhausted the checks on the existing sounder I need to replace it.
The current transducer is fitted through a 50mm diameter hole in the hull and for obvious reasons would like the new one to fit the same aperture, anyone have a recommendation that fits the hole?

 

[PaulRainbow]

What are you changing, transducer, fish finder, depth display ?

 

[johnphilip]

What are you changing, transducer, fish finder, depth display ?

Replacing an Advansea square head (are they 110 x110?) displaying straightforward depth. The transducer is an even older Navman one. Incidentally it is an absolute pig to replace wiring from the bilge to the instruments on the main hatch garage. Is there any way of checking the transducer and possibly replacing the head again? Of course it remains to discover if any modern heads match the old transducer.

 

[Pete7]

John, don't worry about the hole if you are fitting a bigger one. Remove the old one then tap a wooden plug in from the outside. Cut flush and use that to centre a hole cutter. B&Q do individual sizes and the arbor to fit. I fitted new Raymarine ST60s and then sold the tank cutter on here to another fourmite to recoup some of the cost.

 

[Graham376]

.......The current transducer is fitted through a 50mm diameter hole in the hull and for obvious reasons would like the new one to fit the same aperture, anyone have a recommendation that fits the hole?

I had the same problem a few years ago so just left the existing old Stowe depth transducer in place and glued the new NASA Clipper one to the inside of hull with a blob of epoxy, works fine.

Now have to decide what to do about the 30 year old log which has just packed up.

 

[PaulRainbow]

Replacing an Advansea square head (are they 110 x110?) displaying straightforward depth. The transducer is an even older Navman one. Incidentally it is an absolute pig to replace wiring from the bilge to the instruments on the main hatch garage. Is there any way of checking the transducer and possibly replacing the head again? Of course it remains to discover if any modern heads match the old transducer.

Typically, older depth sounders had proprietary transducers. Even if it was the same transducer (often made by Airmar) it wouldn't fit because different display manufacturers used different connectors. More modern systems, particularly NMEA 2000 compliant equipment, will mix and match, in most cases.

I'd suggest that you'll need to change the display and the transducer.

 

[ithet]

I fitted a Navman supplied transducer on previous boat, it was actually an Airmar P319 and required a 51mm (2 inch) hole. Many modern Airmar transducers use that size hole (e.g. as used by Raymarine and most others now I think), so you might not have to enlarge yours.