Earth Dipole

[Phil]

On 21 Jul 2013, at 19:21, Mike O'Dell wrote:

> Eons ago there was a project in one of the electronics rags: The Terraquaphone
> it was for communications through ground or water - half-duplex with a T/R switch.

I think a UK magazine in the 1970s had a project called the "Troglophone", a similar communication system for cavers. As a partial troglophobe, I have no desire to test one.

Phil M1GWZ