Author Topic: My home made Towfish (Read 16916 times)

alex · « **on:** March 07, 2012, 05:32:31 AM »

Hello!
I bigan the construction off my first home made towfish for my 798SI humminbird
you can see the construction on my web site
http://comarche.freeheberg.com/
I will finish it the next week

sonar2000 · « **Reply #1 on:** March 07, 2012, 06:14:15 AM »

Alex,can you post several pictures on this forum...You can put them in the towfish section...
This would be nice...

You click on the media tab at the top and then click on towfish construction tab..

Chuck

Rüdiger · « **Reply #2 on:** March 07, 2012, 11:18:13 AM »

Hi Alex

I've looked at the link, unfortunately my French is not good enough $:-\$ to be able to read everything. Especially your capped transducer would interest me. Would be good if you could post the pictures and some text here in this forum.

mvh
Rüdiger

alex · « **Reply #3 on:** March 07, 2012, 03:31:02 PM »

Hi
Somes pictures from my towfish construction, i finish mounting the transducter and the nylon cable this eving.
Tomorow i will bigan the construction of the Humminbird case to have mobil scan

I have put new pictures on my site

Rickard · « **Reply #4 on:** March 07, 2012, 04:57:10 PM »

Alex, welcome to the towfish builders' gang!
I think your fish will work very well. I must ask about the dissected transducer, what model is that? I'm curious because I hope someone will dissect an XHS 9 HDSI 180 T and report the dimensions of the SI piezos. Why did you cut a transducer in half?
I look forward to hear about the results of your testings!

Kind regards,
Rickard

Roddy · « **Reply #5 on:** March 07, 2012, 11:28:59 PM »

Alex,Welcome to the gang!
Fish looks like it will work well. Please post pix ofof the system win it is completed.

Bon chance and dont hit the bottom! Roddy

Sea-Rover · « **Reply #6 on:** March 08, 2012, 08:15:22 AM »

Hi Alex,

which is nice if you experiment with your Towfish, some will not go, the better for another. but it can also be a fiasko, try on and look at the forum. everyone has put his ideas and the main thing is that if it works.
long, perfect or easily and cheaply, the image on the sonar unit is important.
in this sense ....
regards
sea-rover

alex · « **Reply #7 on:** March 08, 2012, 09:48:25 AM »

Quote from: Rickard on March 07, 2012, 04:57:10 PM

Alex, welcome to the towfish builders' gang!
I think your fish will work very well. I must ask about the dissected transducer, what model is that? I'm curious because I hope someone will dissect an XHS 9 HDSI 180 T and report the dimensions of the SI piezos. Why did you cut a transducer in half?
I look forward to hear about the results of your testings!

Kind regards,
Rickard

It is an HUMMINBIRD TROLLING TRANSDUCER XTM 9 HDSI 180 T 710205 It is a humminbird maintenance dealer who give me it , I just cut it like that

because some body said me that it was empty inside, so salt water could come in with the increase pressure with deep, but the problem is the base cable, the water came in by it in the cable, so i put epoxy as it show on the pictures

THE TRANSDUCTER that i use was buy on Ebay us for 200$

Rickard · « **Reply #8 on:** March 08, 2012, 10:25:15 AM »

Alex,
Thanks, then I know why you cut it. It's true the cables are not designed to withstand pressure so water can leak inside the cable and eventually cause corrosion inside the transducer or at least on the copper wires and the aluminum sheild.
So, it is a XTM 9 HDSI 180 T, excellent! Do you still have it? I would appreciate if you could measure the height and width of the SI elements. I want to compare them to the SI elements in the XTM (or XHS) 9 SI 160 T (262 & 455 kHz). This would be a test of my theory: the elements are the same in both transducer models, but they are oriented differently.
Kind regards
Rickard

alex · « **Reply #9 on:** March 08, 2012, 05:58:23 PM »

Hi thé XTM 9 SI 160 T work with thé 981c si and the 987c si only the XTM HDSI 180T work with every ne HDSI or SI so i will see soon if it work or not

Roddy · « **Reply #10 on:** March 08, 2012, 11:18:36 PM »

Rickard, I will X-RAY a 160 and a 180 today and post PIX with numbers. Roddy

alex · « **Reply #11 on:** March 09, 2012, 02:13:55 AM »

It 's cool

Rickard · « **Reply #12 on:** March 09, 2012, 02:48:22 AM »

Excellent Roddy! I know the cross section of the SI elements in the 160 is 6.00 x 4.65 mm. Do you think you ca see the corresponding measures in the 180? The elements are wrapped in cork and copper foil so it may be difficult to see the piezo inside with X-ray, or is it possible? Anyway, X-rays from both models in similar conditions will be very valuable! We have Abra's x-rays from an 180 and my dissected 160s (http://forums.sideimagingsoft.com/index.php?topic=363.0), but no direct comparison between them.
Rickard

The image shows my theory. Black is the orientation of piezos in the 160 (262 & 455 kHz) and red shows the orientation of the same piezos in the 180 (455 & 800 kHz).
Alex, I haven't forgotten this is your thread and if you think this detour on piezo dimensions is off the subject I can move it somewhere else?

abraquelebout · « **Reply #13 on:** March 09, 2012, 02:05:43 PM »

hi alex
enfin un collègue français
bienvenue sur le forum
poste des images dès que tu en auras
ps: si tu veux me contacter
tu aura mon mail en consultant ma fiche

sonar2000 · « **Reply #14 on:** March 09, 2012, 05:40:31 PM »

Which in English kind of means..

Finally a French colleague
Welcome to the forum
post pictures as soon as you will have
PS: If you want to contact me
You will have my mail by visiting my fact sheet

Chuck

alex · « **Reply #15 on:** March 10, 2012, 03:28:10 PM »

Quote from: sonar2000 on March 09, 2012, 05:40:31 PM

Which in English kind of means..

Finally a French colleague
Welcome to the forum
post pictures as soon as you will have
PS: If you want to contact me
You will have my mail by visiting my fact sheet

Chuck

HI
I see you at rennes, it that make me build a hommade towfish

, we also have a magnetometer

abraquelebout · « **Reply #16 on:** March 11, 2012, 04:53:42 AM »

hi alex, i remember you at rennes
it's nice.
i see your weeb site and i think i go to take participation in your forum.
you make 45 m extented cable, what's is the depht you want to go scanning ?
now in salt water i use a 65 m cable and 6,5 kg towfish
there's no problem for 30 m but if i want to go on more dpht in salt water i must make it so heavy
or take a longer cable
i think making a 85 m extension cable as i do in the begining for my future towfish.
post some pix, all the "towfish gang" are waiting.

alex · « **Reply #17 on:** March 14, 2012, 03:06:26 PM »

the control case

Now i am ready to try it !!!

alex · « **Reply #18 on:** March 17, 2012, 05:28:00 AM »

the plan http://ns8.freeheberg.com/~comarche/images/towfish.pdf in pdf file

http://ns8.freeheberg.com/~comarche

depark1 · « **Reply #19 on:** March 17, 2012, 04:42:08 PM »

That is an awsome plan. It is the first one that I have seen that shows every step in the construction of a Towfish. Very well done! Thanks for sharing.

sonar2000 · « **Reply #20 on:** March 17, 2012, 04:43:28 PM »

Alex you might want to put that in the articles and tutorials..

Chuck

alex · « **Reply #21 on:** March 30, 2012, 04:37:41 PM »

Himi try ait todday and ait seem work well, but i have a lit le problème with the rec fonction on the 798 si

, thconsol doesn't want to go on rec fonction thé image will cam soone
$:-\$

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