Other Interest > DIY - Side Scan Sonar and towfish

Helix G3 and towfish

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abraquelebout:
Hi
No extra sealing for the cable entry, for moment max deep use with 100 m cāble is 45 m, no problem, but it's true, the sealing seem's not strong.

Chris_NSB:
I believe the transducer is potted in some type of resin. I had an older 798 that was stored in a hot garage and something that looked like resin oozed out of it. So I think it's likely safe at depth.

Also, I'm just finishing up building my own Helix 9 G2 DIY towfish. Let me know what you think:

abraquelebout:
hi chris
it seem's good
if you want to know what is in ducer there is repply in forum
http://forums.sideimagingsoft.com/index.php?topic=10052.0

nan1:
Hi
What about the Helix G3 tests?
With 50 metres cable the résults in 455 chirp and 1300 are very Good. What about 800 hertz?
Have you similar résults with 80 m or 100 m cable?
Bravo et merci for sharing your researchs
Bernard

abraquelebout:
hi Bernard
now whe  use two towfishs with 80 m cāble for deep water and one with 20 m for under 12 m depth
all frequencies give good result but whe can see a little lost signal in coverage distances.
this pics is with chirp at 1000 / 1300 in river made with 20m tow cāble , it's an old wreek protected with bidim and sand bags

and this is 2 canons with the 80m cāble towfish in salt water at 455 khz chirp

it's interesting ::::whe lost use  800khz chirp ....may be  a try in fiew weeks...

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