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Re: Wireless power transmission

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 04:01 PM 3/14/2005, you wrote:
Original poster: Dan Kunkel <dankunkel@xxxxxxxxx>

seems like richard quick (possibly?) experimented with a 1kva coil and
had a successful transmission at 1/4 mile! he claimed to have made a
flourescent tube bright enough to read by, this was back in the
early-mid 90's. this system even lacked efficiency because it was not
tuned to any of earth's fundamental resonant frequencies.

Lighting a fluorescent tube doesn't actually take very much power (<1 W). Your eyes are quite sensitive, so it doesn't need to be very bright to be able to read by it (for instance, after dark adapting, one can read by the light of the silvery moon, and that's actually quite dim).

For all the folks who have done this demo, there's remarkably little quantitative information on just how bright it was (as in lumens or lux, measured with a lightmeter).

you can get a copy of Tesla's CSN from Barnes and Noble or Amazon on the net.

It's a bit tougher than you might think. It's out of print, but amazon has some used copies for $200 (hardcover). It also shows a special order for a new copy at 40.

What you really want is Richard Hull's annotated notes, but that's even harder to come by.

here is my understanding of how Wireless Transmission works...

Use a very large topload on the transmission coil, so large that it
prevents ANY streamers. retune the primary circuit to the new lowered
frequency. this will drive the RF current into the ground wire.

the recieving coil should be tuned to the same frequency of the
transmitting coil (but this doesnt have to be EXACT). the ground wire
of the recieving coil will pickup and resonate with the currents in
the earth. you can also place a large topload in the secondary and
tune a primary coil and caps to resonate with the secondary. then you
can draw power from where the spark gap would normally exist on the

This is nothing special, and is basically a spark gap transmitter. No breakouts -> maximum RF radiation from a loaded short monopole (and, of course, the ground has to be really good).

Radiation efficiency is hideously poor (as in cranking megawatts into the system to radiate watts... take a look at the big VLF transmitters used by the Navy for an example)

obviously a suberp grounding system on both coils is a must. for
global results use one of earth's resonant frequencies...that will be
a HUGE coil though.

As in impractically large.

Wireless transmission of power is a commonplace event: that's how broadcast radio works. You broadcast some tens of kilowatts, the radio receives some microwatts, and you've transmitted power (and, potentially some information).

There are more extreme examples: detection of the few watts from deep space probes here on earth. (For instance, the recent Huygens probe that dropped to the surface of Titan radiated about 5 watts and was detected on Earth some billion and a half km away.)