He's coming by today, Walt, to return some equipment loaned for his
recent trip. I'll ask him what his plans are.
Bernie
>From: Wild Sanctuary <>
>
>>
>> I haven't personally used it, Walter. But from the field reports of
>> others, it would be my next choice when/if my older Offshore
>> Acoustics h-phone fails. I'm sure it'll record in shallow fresh water
>> or even in someone's kitchen sink although the lo freq signal in
>> shallow water is pretty much non-existent. For lo freq, one needs to
>> have deep water, a long cable fully extended to depth, and critter
>> vox that puts out a long wave form. But for froggies, insect larvae,
>> water boatmen, etc., I'd go for it. I just saw it the other day when
>> Nate brought it by (he's a local student just entering college who
>> spent 9 months as an intern on a research and teaching vessel in the
>> S. Pacific) and it looks new. He's got a mini-jack adapter plug that
>> connected to the MD recorder he was using.
>
>I'm aware of the frequency shifts for shallow water. I do get enough low
>end for the frogs I've tried.
>
>There's also the folks that claim it's entirely killed at all
>frequencies by phase interactions between surface and bottom, which is
>not so. Though that does make the sound in shallow water die faster.
>
>Sounds good. I'd already written, but he's not replied as of yet.
>
>> One of the things I've done with spade foots is record one channel
>> with the h-phone and the other with an in-air mic since they transmit
>> in both media. The result is pretty outrageous.
>
>That was done quite a bit here with gopher frogs. The gopher frog clip
>on the GA frog CD is actually the hydrophone side out of a froglogger
>recording done like that. With gopher frogs it's hard to tell which
>media the recording is from.
>
>So far I've not found spadefoots calling in deep enough water. Maybe
>barely cover the hydrophone. I'll keep them in mind. I'm primarily
>interested in some of the Ranids.
>
>Walt
>
>
>
>
>
>"Microphones are not ears,
>Loudspeakers are not birds,
>A listening room is not nature."
>Klas Strandberg
>Yahoo! Groups Links
>
>
>
>
--
Wild Sanctuary, Inc.
P. O. Box 536
Glen Ellen, California 95442-0536
Tel: (707) 996-6677
Fax: (707) 996-0280
http://www.wildsanctuary.com
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