Thanks again for the info
I wonder if the hydrophones record sounds in water which are
simply the atmospheric sounds, like the little clicks/scrapes, that
one hears while scuba diving, etc, not only just whale or dolphin
vocal sounds. Somehow I fear the mics might not be detailed
enought to get an ambient under water sound. Have you noticed
this?
Im going to check out the whale watching site. I think I already
found the one you are talking about..
Thanks again
--- In Walter Knapp <
> wrote:
> From: <>
>
> >
> > Olivia,
> >
> > I found the following list of available hydrophones:
> > http://www.dal.ca/~whitelab/marmam/hp.htm
> >
> > The great news is that there are a variety of hydrophones
listed in a
> > variety of price ranges. Unfortunately, apparently a lot of
them require
> > some sort of charge amplifier to convert the signal to
something useful.
> > That is why phantom power would seem to be a good thing.
Getting a
> > high-impedance device like a hydrophone to work while
immersed in salt
> > water, and to keep working, must be a tough engineering
job. If you were to
> > make it battery powered, then that implies that you would
have to be able to
> > open it up and that implies an entrance for corrosive salt
water...
> >
> > Eric
>
> >> Heres a dumb question-why is the phantom power so
important? Simply
> >>because you dont want to use a battery under water?
>
> Both the hydrophones I have pass the battery power down the
cable from a
> power box that's not immersed. The power box could be a
small pelican
> box and thus waterproof, though mine are not. You do not open
up a
> hydrophone, they are made and permanently sealed typically.
The cable is
> of course sealed with them. Everything to and from then goes
via the cable.
>
> For a inexpensive hydrophone, look into places associated
with whale
> watching. That has resulted in a number of low cost
hydrophones,
> typically with a headphone amp and a output to a recorder.
One I have
> like that is from:
> http://www.aquarianaudio.com/
> I have that entire hydrophone system (long cable version)
along with a
> miniplug to XLR adapter cable stored in a Pelican 1060 case. I
got it
> off ebay this year and have not had a lot of opportunity to use it
yet.
> Seems to work fine.
>
> Phantom power is more important because it's the power
used in pro
> equipment. As you move up in mics you find plenty that only
work with
> phantom power. So, having it available removes a equipment
limitation.
>
> Phantom power is also associated with balanced cables.
These are far
> less likely to pick up interference and send it into your pre. This
is
> not a big issue in nature recording where we are generally
fairly far
> for sources of interference. However another thing about
balanced cables
> is that they usually allow longer cable runs, which can be a
issue in
> some nature recording.
>
> There is a lot to say for not having a variety of battery powered
> equipment. Using all phantom powered gear means you only
have to support
> your recorder, which uses it's battery to power the mics. I find
this
> does not use enough battery power to be a problem, and the
convenience
> of just plugging in any of my mics without worrying about their
> batteries is well worth it.
>
> Walt
>
________________________________________________________________________
________________________________________________________________________
"Microphones are not ears,
Loudspeakers are not birds,
A listening room is not nature."
Klas Strandberg
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