Re: wireless transmitter (fwd)

---------- Forwarded message ----------
Date: Fri, 19 Dec 1997 16:37:02 -0700
From: "D.C. Cox" <DR.RESONANCE-at-next-wave-dot-net>
To: Tesla List <tesla-at-pupman-dot-com>
Subject: Re: wireless transmitter (fwd)

to: Jim & List

Great caution must by employed here if you are not familar with microwave
properties.  Open air microwaves from an oven with removed magnetron can
cause nearly instant blindness.  It seems the jellied portion of the human
eye especially absorbs microwave radiation and at this power level will
cause cataract formation in a matter of seconds.  Best to leave the
magnetrons alone and perhaps think along the lines of a lower freq device
as the early wireless sets were.  Cataract formation and open air microwave
devices are nothing to "tinker" with as a few early radar pioneers found
out -- they went blind.


> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: wireless transmitter (fwd)
> Date: Friday, December 19, 1997 7:17 AM
> ---------- Forwarded message ----------
> Date: Thu, 18 Dec 1997 22:12:49 -0800
> From: Jim Lux <jimlux-at-earthlink-dot-net>
> To: Tesla List <tesla-at-pupman-dot-com>
> Subject: Re: wireless transmitter (fwd)
> >   I am very interested in building a small wireless power transmitter. 
> Why not use microwave transmission of power. Easy to control the "beam",
> relatively easy to construct an array of "rectennas" (dipoles with a
> rectifier). Lots of references to check out such as early works on
> Satellite Power Systems (array of solar cells, beaming power back down to
> earth, etc.) There was a microwave powered helicopter built about 20-30
> years ago.
> Start with a microwave oven magnetron as a power source, about a half
> kilowatt at 2450 MHz (or 12 cm wave length). Build a suitable horn as a
> transmitting antenna with narrow beam width. the rest is an exercise for
> the reader.