AVR-Chat

I have spent 4 1/2 years on a US Navy submarine. I know how it is done. I just have to figure out how to do it in small scale. soft bottom and close distance. this is a problem.

--- In AVR-Chat@yahoogroups.com, "bobgardner@..." <BobGardner@...> wrote:
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> Drag two hydrophones behind the boat. Use an a/d chip that does simultaneous sampling. A prop approaching from 45 deg to starboard has its chugchugchug waveform reaching the front mic before the rear mic (shorter radial distance). I guess you need to drag two more hydrophones abeam from poles to tell if the noise is coming from port or starboard.
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