Earth Dipole

[Mike O'Dell]

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.

If i remember it right (50-50 chance),  for "transmitting", it was 
basically a transistor audio
amplifier driving a filament transformer backwards as a step-up output 
transformer.
the "output" was fed to a pair of spikes pushed into the ground about 20 
feet apart.
in "receive" mode, the amplifier was fed from the spikes with some extra 
voltage
gain.

the explanation was that it was driving the sheet resistance of the ground.
range was impacted significantly by ground resistance which was highly
correlated with ground moisture. it also worked with the spikes at opposite
ends of a canoe.

I played with the idea for a while but it wasn't all that interesting.

     -mo



On 7/19/13 9:34 AM, William Fenn wrote:
>
> For those who made it to last nights AMRAD meeting here is a little 
> information on the Earth Dipole:
>
> http://www.vlf.it/ed/earthprobes.html
>
> This web page is a part of  IK1QFK, Renato Romero Home Page;
>
> http://www.vlf.it/
>
>
>
> _______________________________________________
> Tacos mailing list
> Tacos at amrad.org
> https://amrad.org/mailman/listinfo/tacos

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