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Author Topic:   Fish finder transducer
tarbaby posted 06-06-2001 04:04 PM ET (US)   Profile for tarbaby   Send Email to tarbaby  
I have just bought a new Raytheon fish finder and will use it to replace an old Humminbird Platinum ID. My question is this, Can I use the existing in-hull transducer in my new application? The H-bird works fine , I just want to update to newer equipment. Should I buy an in hull transducer and forget this idea? Can I just splice wires and make it work.I am trying not to have clutter on my transom. Shay
jimh posted 06-06-2001 07:49 PM ET (US)     Profile for jimh  Send Email to jimh     
"Can I use the existing in hull transducer?"

There are several issues. First, how the heck do you get an in-hull transducer to work in a Whaler hull? This is usually not possible because of the foam construction. Perhaps your reference to in-hull is something different. It would be best if you explain how the current transducer is mounted.

Is the current transducer compatible with the new fishfinder? That is a hard one. First, transducers have a resonant frequency associated with them, generally in the range of 50,000 - 200,000 cycles per second, or 50-200 kHz. The new transducer would need to be resonant in the same frequency as the old one.

The transducer would also have to be able to handle the power from the new fishfinder. It may be higher than the old unit.

The cable splicing could be problematic, too. Typically a coaxial type cable is used. You could affect the performance by splicing the cable, altering its length, or distrupting the shielding.

All that said, if the existing transducer is specially installed in the whaler, that is, if it is a real thru-hull or in-hull installation, and you wanted to retain it,
you probably couldn't hurt too much by trying it. If it didn't work, you could always resort to the transducer that came with the new fishfinder.


lhg posted 06-06-2001 08:13 PM ET (US)     Profile for lhg    
Whalers, except for the 25' hull, are not supposed to have "shoot thru hull" transducers, period. They don't work, and they don't want you tearing up the inside hull and scaping out foam either. This can cause serious hull failure. The transom is the place they are to be mounted.

With respect to the 25' hull, the Owners Manual says there is a specially molded place in the forward area of the hull where the two skins come together, just for an inside transucer mount. But I have yet to find it in mine! I used the transom.

Wagon1 posted 06-06-2001 08:52 PM ET (US)     Profile for Wagon1  Send Email to Wagon1     
Stick with the transducer designed for your equipment. If it recommends mounting on the transom, do it. I'm assuming you have a big whale (I used this technique on my 13 and it worked great). Try this...Mount your new tranducer to the end of a piece of 2 X 4 X about 3 ft. Bring a C-clamp with you when you check it out on the water. Now, C-clamp the 2 X 4 mounted tranducer to a spot on the transom you think will work, based on distance from the prop and strake, etc. If you do not get good readings, or it cuts off at speed, you can try a differnet spot. Once you have good location, mark the location with a grease pencil and perminatly mount the transducer. Good luck.
tarbaby posted 06-06-2001 10:10 PM ET (US)     Profile for tarbaby  Send Email to tarbaby     
Thanks for the replies. I will order a new transducer.
DIVE 1 posted 06-06-2001 10:17 PM ET (US)     Profile for DIVE 1    
What size is your whaler? On both of our 22' Raiders thru the hull transducers were factory installed by CPD. They are located on the starboard side in the aft bilge pump area.
tarbaby posted 06-06-2001 10:28 PM ET (US)     Profile for tarbaby  Send Email to tarbaby     
This is in a Swan Point, Not my whaler. I am sure that this did cause some raised eyebrows!!!Sorry for the confusion.

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