Re: wireless transmitter

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Sunday, December 21, 1997 4:13 PM
To: 	Tesla List
Subject: 	Re: wireless transmitter (fwd)

Hi Ed, Dave, all,

> Date: Fri, 19 Dec 1997 13:49:14 -0600
> From: David Huffman <huffman-at-FNAL.GOV>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: wireless transmitter (fwd)
> Ed,
> This sounds like a neat trick. Have the transmitter secrected away and only
> show your audience the receiver, a top loaded coil connected to ground,
> producing sparks with no apparent source.
> Got to try this!
> Dave Huffman
> -----Original Message-----
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
> Date: Friday, December 19, 1997 1:30 PM
> Subject: Re: wireless transmitter (fwd)
> ---------- Forwarded message ----------
> Date: Fri, 19 Dec 1997 13:37:32 EST
> From: Esondrmn <Esondrmn-at-aol-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: wireless transmitter (fwd)
> In a message dated 97-12-18 23:56:57 EST, you write:
> << Fellow Coilers,
> >
> >  I am very interested in building a small wireless power transmitter.
> >Has anyone on the list ever tried to construct one? Can a classic coil
> >be converted into one? I am interested in any good sources of
> >information or anything that could help.
> >  I am considering building this for my senior project here at college.
> >I want my senior project to have something to do with Tesla, and I
> >probably cant use a TC because it has to have a uprocessor and be
> >practical and useful for something. I don't know how practical a power
> >transmitter is, I don't think that much has been done in this since the
> >days of Tesla. Even if one couldn't build one to be efficient, I would
> >still be interested, as long as I could build it to be at least 20%
> >efficient. Power transmission needn't be more than 50' or so.
> >  Ideas/suggestions? Or just scrap the whole idea? I would be very
> >interested if anyone had some firsthand knowledge about such things.
> >
> >Tristan Stewart
> > >>
> Tristan,
> I know for a fact that Richard Quick has done this.  If I remember his
> experiment, he used a classic spark gap excited Tesla coil with the
> secondary
> grounded.  The toroid on top was enlarged to a point where it would not
> break
> out - no sparks.  This will cause the coil to increase it's RF output and
> will
> cause interference problems with nearby electronic equipment.  He then used
> another secondary coil, tuned to the same frequency as the operating coil.
> This second coil was placed some distance ( a hundred feet or so if I
> remember
> correctly) away and the bottom was grounded - to a metal culvert I believe.
> When the coil was powered up, the reciever coil produced sparks about as
> large
> as the transmitter coil did originally.
> Ed Sonderman

There is a picture in the CSN of Tesla doing something similar near 
the lab. He used a resonator as a primary and either stepped it down
or put bulbs in series with the ground wire. It was the closest he 
got to transmitting power as far as I'm aware.