From: Scott F. Touchton >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