Re: And what of the FCC? (fwd)

To: tesla-at-pupman-dot-com
Subject: Re: And what of the FCC? (fwd)
From: Tesla List <mod1-at-pupman-dot-com>
Date: Sun, 28 Sep 1997 14:19:47 -0600 (MDT)
Approved: mod1-at-poodle.pupman-dot-com

---------- Forwarded message ----------
Date: Mon, 29 Sep 1997 07:48:58 +1200
From: Malcolm Watts <MALCOLM-at-directorate.wnp.ac.nz>
To: tesla-at-pupman-dot-com
Subject: Re: And what of the FCC? 

I also have done radiation checks on running coils.....

> From: Greg Leyh <lod-at-pacbell-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: And what of the FCC?
> 
> Julian Green wrote:
> 
> 
> > My first coil resonated at 220KHz which is on the LW band of a domestic radio.
> > 
> > I did a walk test and at close range (20 meters) I could tune into the coil.
> > At 150 meters - zippo.
> 
> Given R. Hull's and your experiences with measuring RFI, 
> it would seem that the radiation from a tesla coil is
> almost entirely 'near-field', as opposed to the radiated
> field from a quarter-wave antenna.
> 
> There is some hope then for future coils, if the RFI can
> be counted on to die away within 100 coil lengths distant
> from the TC.

A well tuned coil loaded by spark and with a good ground radiates 
very little. Remove any of the above three items and you can guarantee
you are causing someone a problem.

Malcolm