If you are talking about a small pond or tank I might try putting a
transmitting coil around the whole pond.  Use electric fence materials
for a durable outdoor installation.

Sherpa Doug

> -----Original Message-----
> From: Scott Stephens [mailto:Scott2@MEDIAONE.NET]
> Sent: Tuesday, July 10, 2001 9:50 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [EE]: Underwater RF
>
>
> From: Scott F. Touchton <Scott.Touchton@US.JDSUNIPHASE.COM>
>
> >In college I built a sub using depth finder transducers to
> communicate
> >acoustically... we never found the limit of the range (pond was too
> >little).  We at least had 500'.  Will this approach work for you?
>
> I would definitely choose acoustics for underwater
> communication. Just watch
> for the multi-path interference in small, complex places.
>
> >Also, magnetic fields are uneffected by water... you may
> have better luck
> >(less attenuation) dealing with the magnetic field component
> instead of
> >primarily the electric field component.
>
> Rapidly changing magnetic fields will induce electric fields,
> and the signal
> will not propagate as a wave (at 2 meters) for long. I'll
> SWAG using a loop
> or ferrite antenna would increase the reception depth another foot.
>
> Scott
>
> ****************************************************************
> Freedom is pursuing your carrot, not running from a stick.
> The mob only rules what its members are allowed to achieve.
> Physics - the manifold ways the odds always get even...
> ****************************************************************
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>
>
>

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu