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
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