Re: Hydrophone

["Scott Shakespeare" <shakey10@hotmail.com>]

>        When you say 'hydrophone', do you mean a receiver/transmitter 
for
>ambient broad spectrum 'noise' - or a dedicated u/w sub to surface
>communication device operating on a specific frequency?
>Phil Nuytten
>

I originally was thinking of the broad spectrum "noise" hydrophone just 
for listening and recording the general noise in the water, but I would 
love any information on any kind of sub to surface comunication device.

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