From kukkonen@snakemail.hut.fiMon Apr 3 09:12:06 1995 Date: Wed, 22 Mar 1995 06:48:44 -0700 From: Kristian Tapani Ukkonen Reply to: usa-tesla@usa.net To: billbeskimo.com Subject: Re: Electrostatic motors & Tesla coils > Fred W. Back wrote: > I have built ground communications like this using audio frequencies. > But I really really don't think you can transmit any appreciable power > this way using ground currents. Has it ever actually been *done* ? I guess that it depends on what you consider "appreciable" but N. Tesla did it - and so has Richard Quick with a transmitting (about 2kW) system, here is a quote: > RQ wrote in rqmsgs.txt: > Experiments confirming his ideas can be performed with small > coils. I took a single 6" Tesla secondary, no primary or tank > circuit, just a coil and a discharger; and walked over a quarter > mile, to a nearby creek. I grounded the coil by placing 10' of > aluminum flashing in the creek water. Back in my basement, an > assistant fired a Tesla coil that operated at the same frequency > as my "free" coil in the creek. The system being fired was loaded > with discharger, so spark could not break out. > > Down in the creek I was able to light bulbs from the top of the > grounded coil, despite the 1/4 mile distance (and don't forget a > creek bank and a rebar wall) between my location and the power > supply. This coil was not receiving radiated signal, it was > resonating on base fed ground current. If I do interpret this correctly, he was getting "appreciable" amounts of energy transmitted - something like 5-10% - as we note that the tesla-circuit itself is not optimal, so the actual losses at the actual transmission must be even lower, right? (Isn't the "theoretical loss" of a normal tesla-coil 50% while the losses can be got to less than 10% with larger magnifying transmitters..?) This is a feat that could not be done with Hertzian waves - as they do weaken proportional to the square of the distance.. Yours, Kristian Ukkonen. ---------------------------------------------------------------------------- | Kristian Ukkonen | Do as thou wilt shall be the whole of the law | | kukkonen@alpha.hut.fi | Fear is the mind-killer | ----------------------------------------------------------------------------