> -----Original Message-----
> From: PIC microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Alessandro Zummo
> Sent: March 10, 1998 12:40
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: OT: Radio Transmission in Water
>
>
> Il 10-Mar-98, The Jacky's scrisse:
>
> > Water conducts sound extremely well , better (and faster) than air.
> > I thinking in a very free form mode here but you could rip the
> > transducers off a couple of old fish finders and use em for tx and rcv.
> > units.
> > I think these guys operate above 30 kHz.  You may be able to modulate
> > enough info on to the carrier to do slow frame video.
>
> The question is: where can I get them and how can I protect
> any other emitter from water without loosing it's capabilities...

        I believe most emitters are piezo, which is real easy to find. Look in o
ne
of the recent electronics now issues, they have a hydrophone project. The
emitter consisted of a piezo element epoxied in a bottle cap or something
like that. TTYL