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'[OT] sonar communication'
2002\09\09@091352 by Chris Loiacono

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I noticed Doug Butler's mention of experience with sonar, and was wondering
if he or anyone with similar experience could point me in the right
direction with a personal project.
I would like to be able to send and receive serial data underwater. I at one
time built hydrophones with small piezo elements that would listen to
underwater sounds and then transmit the recived data via RF from a floating
antenna just above.

This time I want to send short text bursts and receive them at another
underwater unit.
To be most honest, I worked on the other project 10 or 15 years ago, and I
don't remember things such as the optimal frequency to use in water, etc.,
and that project did not do any underwater transmission.

I'm not looking for a free education here - I'm really astounded as to how
little information is available in print or on line. Perhaps someone can
help by pointing me in the right direction.

TIA,
Chris

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2002\09\09@094922 by Russell McMahon

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Like this ? Frequency given.

       http://www.lbri.go.jp/lbri/auv.htm

Professional underwater voice comms. No details

       http://www.oceantechnologysystems.com/

   Speech on 33 kHz carrier

           http://www.oceantechnologysystems.com/through_water.html

Reference only. Sounds hopeful.

       http://nmml.afsc.noaa.gov/library/acquisitions/Jun01.HTM

       Voegeli, Frederick A., et al. 2001. Ultrasonic telemetry, tracking
and automated monitoring technology for sharks. Environ. Biol. Fishes
60(1-3):267-281. REPRINT FILE.



       RM


> I noticed Doug Butler's mention of experience with sonar, and was
wondering
> if he or anyone with similar experience could point me in the right
> direction with a personal project.
> I would like to be able to send and receive serial data underwater. I at
one
> time built hydrophones with small piezo elements that would listen to
> underwater sounds and then transmit the recived data via RF from a
floating
{Quote hidden}

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