Hydrophones can be got through Offshore Acoustics (Beverly Ford),
604-929-0440, N. Vancouver, BC. Sorry, don't know the email address
but she might have a web site. I've been using her h-phones for over
12 years, now, and find them to be reasonable (around $350USD),
relatively noise-free, durable, and sensitive.
Only problem might be the currents in the Bay. Make sure that the
h-phone is in a place that doesn't have a lot of streaming pressure
from water movement by the transducer. Otherwise, because they are so
sensitive, they will overload.
Bernie Krause
>Hello,
>
>This might be slightly off the course of normal conversation for this grou=
p,
>but I need to harness the collective brainpower for some help with a
>hydrophone conundrum.
>
>First let me explain how I plan to use it. In October, I'll be
>participating in a group swim from Alcatraz to San Francisco. While
>training for the swim, I couldn't help but wonder what 250 swimmers
>high-tailing it through the 62 degree water of San Francisco Bay would sou=
nd
>like, from just below the surface. Getting a hydrophone and attaching it =
to
>my wetsuit is the easy part, but I'm having trouble figuring out how to
>record. I'd like to use my consumer minidisc recorder, which can easily b=
e
>kept dry in a pelican case, but the problem is how to get the cable from t=
he
>hydrophone to the recorder. So my questions are:
>
>1. Is there such a thing as a wireless hydrophone that would work with a
>consumer MD recorder mounted nearby?
>
>2. If not, any ideas as to how I might connect the hydrophone's cable to
>the MD recorder while keeping the recorder dry? (bearing in mind that bot=
h
>items would probably be strapped or taped around my torso, and thus expose=
d
>to the water for the whole hour or so I'll be swimming)
>
>3. Since I've never used a hydrophone before, is this even a worthwhile
>thing to try? Or would the drag created by my swimming just make a lot of
>noise and not capture anything else? I think I can rig it in such a way
>that it won't tangle in my feet and so forth, but I'm not sure how effecti=
ve
>the hydrophone is if it's constantly moving.
>
>4. Any recommendations on a fairly cheap hydrophone?
>
>Any other suggestions would be greatly appreciated. The recording might e=
nd
>up being just a bunch of swimmers breathing and arms slapping the surface,
>but I thought it might be worth a shot anyway...
>
>Thanks very much in advance,
>
>Tony Cross
>
>
>
>[Non-text portions of this message have been removed]
>
>
>
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