Humminbird Side Imaging Forums

Other Interest => DIY - Side Scan Sonar and towfish => Topic started by: abraquelebout on October 25, 2010, 07:56:57 AM

Title: scan at 800khz, the souk on river
Post by: abraquelebout on October 25, 2010, 07:56:57 AM

hi, i dive in point find whit towfish on river at 10 m depht 8)
it's the "souk", 3 wreek in 20 m, middle aged wreek, roman column and 16 e siecle potery
a exemple of survey for archeology
yes towfish is workink weel!!!!

Title: Re: scan at 800khz, the souk on river
Post by: Rickard on October 25, 2010, 09:19:27 AM

Beatiful and thrilling!

It's very interesting to see the range you get at 800 kHz. I would have predicted much shorter range at that frequency and with that length of cable. I assume you used the long towfish cable?

Rickard

Title: Re: scan at 800khz, the souk on river
Post by: Jolly Roger on October 25, 2010, 01:48:10 PM

Souk?

Are you refferring to the word "market" in arabic? That's what it looks like: A market under water with all sort of stuff to show. Very interesting!

I couldn't go diving today. Nose and throat were closed and the weather was also bad. Next year is another season....

Regards / Harry

Title: Re: scan at 800khz, the souk on river
Post by: abraquelebout on October 25, 2010, 04:45:49 PM

yes, i use the towfish with 60 m cable.
at 2 or 3 m i take 5 depht under  transducer range (15 m)in 800 khz, and at 3 or 4 meter  10 depht in 455 khz (30 or 40 m range). Picture under 3 meter in 455 seen over exposed
now i begin to make another towfish in composite (carbon and epoxy fiber)
next satuday i want to dive on another point find with the sonar.
i think there's an anciant wreeck ...
there's no visibility for foto, just 1 meter max.
it's the adventure !!! :D