Author Topic: Transducer for towfish - depth rating?  (Read 187 times)

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Offline Kving

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Transducer for towfish - depth rating?
« on: November 29, 2018, 02:37:42 AM »
Dear all,

I'm a newly registered user on this forum. I own a Marine Sonic side scan system which is about 15 years old. I have a 150 kHz towfish and a 600 kHz towfish. I've seen many DIY projects both here on this website and on other sites, and I want to make my own towfish connected to a Humminbird or Garmin system. I've seen that the Humminbird system provides excellent images, but I already have a Garmin 1222xsv, so I might try with that first.

My question is simple:

How do I know how deep I can send my transom mounted transducer? I've tried to reach out to Garmin, but they cannot give me any good answers. I've seen that you all are mounting the transducers on a bracked underneath the towfish, which seems fantastic simple! I was thinking more of a similiar solution like Kenneth Sørensen has: http://forums.sideimagingsoft.com/index.php?topic=9399.0  . And then I would use custom gaskets to prevent water from coming to the "top side" of the transducer. This is a more delicate operation since I then need to customize gaskets and make it 100% waterproof for approx 15-20 bar.

I want to be able to send my transducer as deep as possible. The ethernet/signal length is fixable.

I look forward to receive replies from you guys! I want to know how deep you've went with your transducers.


Offline Rüdiger

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Re: Transducer for towfish - depth rating?
« Reply #1 on: November 30, 2018, 02:44:29 AM »
Hey Kving

Welcome to the forum :).
Regarding Garmin you will get rather few answers.
The use of HB at very great depths is already covered by the maximum length of the towing cable. At about 120m length should be over there. In order to tow the dealer on full cable length you would have to work with very big weight.
When donors can on the basis of the shrinkage of the sealing resin ducts to kapilarartigen the cure result which allow ingress of water under high pressure.
Therefore some members have protected the cable entry with additional sealant.

mvh
Rüdiger
Sorry
English is not my first language !
http://de.groups.yahoo.com/group/SOB-International/

Offline abraquelebout

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Re: Transducer for towfish - depth rating?
« Reply #2 on: November 30, 2018, 10:08:30 AM »
15-20 bars, you want scan at 150-200 m depht ?
i use 100 m cable and go at 60 m depht   max for the ducer (with lot of eavy lest) , 7 bars no problem, sealing with epoxy resin.
at 15 or 20 bars, i don't know....

Offline Kving

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  • Joined: Nov 2018
  • location: Norway
  • Posts: 2
  • Unit(s): I own none yet, only Lowrance and Garmin
  • Software: N/A
  • Accessories: I want to make DIY HI Towdfsh
Re: Transducer for towfish - depth rating?
« Reply #3 on: November 30, 2018, 12:11:46 PM »
Thank you for your answers. There is no problem to work with big weight. I use a hydraulic winch on the back of my boat when I'm using really heavy equipment. I might try to make a small towfish just to test it, but I'm scared that the water fill find it's way into the transducer at 15-20 bars. To use epoxy resin is a good tip!

I've also been thinking of desecting the transducer and remount it in a DIY towfish. If I do it like this, it would be possible to add a electric connector that it's approved for the depth rating.

I'll go looking for some cheap transducers to see if I can build myself a towfish.



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