Thanks Bill for this and the many other enlightening contributions you regularly treat us to and which we seem to take for granted.
Couldn't a "real" radio receiver be used to see if the lab receives significant emissions at 18MHz? How has this freq been determined BTW, I thought the circuit didn't tolerate probing? Michel ----- Original Message ----- From: "William Beaty" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, October 24, 2007 5:33 AM Subject: Re: [Vo]:Re: "Cold" electricity > On Tue, 23 Oct 2007, William Beaty wrote: > >> For enormous Q-factors such as with superconductors, the effective >> aperture is about a quarter wavelength, and such an antenna absorbs RF >> energy in an area of 1/8 wavelength squared. > > Oops, that should be 1/16 wavelength squared. For 18MHz, that's an > absorber region of around sixteen square meters. An ideal resonant > antenna absorbs half the RF energy passing through that region, and > radiates (scatters) the other half. The antenna can be an extremely tiny > coil, yet the process still works the same. So, if some shortwave antenna > is sending a few milliwatts per square cm through Ron's lab, and his coil > happens to hit its resonant frequency, then his results are conventional > and have nothing to do with physics anomalies. > > Moving Ron's device to other locations should show the truth. > > I see that WP has an entry: > http://en.wikipedia.org/wiki/Aperture_(antenna) > They say wavelength squared divided by 4*pi, rather than by 16 > > Another way to think about it: a standard half-wave dipole antenna works > the same whether made from #8 wire or #28 wire, yet the broadside area of > the wire has two very different values. Why? Don't these two antennas > absorb very different amounts of RF, and cast very different RF shadows? > Nope. It's because a wire antenna creates it's own EM field, and the > absorption process involves the waves radiated by the antenna cancelling > out the incoming EM and punching a large "rf shadow" in the waves passing > by the antenna. There's an interference pattern with a big black node > downstream from the antenna. Where RF is concerned, the "shadow" of an > antenna doesn't look like a piece of thin wire, instead it's a fuzzy > circle about a quarter wavelength across. > > BTW this also explains why sodium vapor looks black under sodium light, > where sodium atoms an angstrom in diameter and couldn't possibly act as > significant absorbers. But high-Q resonating atoms can be "virtuall > large" absorbers of waves which are 5900 angstroms wavelength. Tiny > high-Q resonant antennas emit very strong waves of their own, so they act > the same as wire antennas thousands of times larger. > > > > (((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) > William J. Beaty SCIENCE HOBBYIST website > billb at amasci com http://amasci.com > EE/programmer/sci-exhibits amateur science, hobby projects, sci fair > Seattle, WA 425-222-5066 unusual phenomena, tesla coils, weird sci >
