There is a TAB book from 1979 you might want to look up: How to build & use
low-cost hydrophones by Frank Watlington ISBN 0-8306-1079-0.  The original
price was US$4.95.

Doug Butler
Sherpa Engineering


> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of John Nall
> Sent: Sunday, May 11, 2003 7:54 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT]: Underwater navigation
>
>
> At 06:07 PM 5/10/2003 -0400, Doug Butler wrote:
>
> >I think we are talking about using ultrasonic signals, not
> electromagnetic
> >waves like LORAN.  The receiver needs a transducer, like an underwater
> >microphone, not a ferrite antenna.
>
> Yeah!!!  Gosh, using a transducer at the receiver end never once
> crossed my
> mind, but it makes perfect sense!!
>
> Anyone have any links to a "used transducer" site?? :-)  (I know
> that I can
> buy them new, but this is a low-budget research project).
>
> John
>
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