[R-390] Small Voodoo Antennas and Maxwell's Equations

[Bob Camp]

Hi

If Maxwell is right (and in better than a century nobody's proved 
different) then you can make some pretty neat smaller antennas. The 
problem is that nobody has ever figured out how to do a good enough job 
of it.

This actually gets back to another R390 issue I keep fishing around on.

One of the ways to do a "compact dipole" is with a small resonant loop. 
The output impedance of these things can be almost anything depending 
on their design. They are inherently a low noise balanced antenna and 
you mess them up a bit when you convert them to a balanced line. The 
lowest noise configurations are generally shielded and balanced.

Now let's see, shielded balanced antenna that may have an unusual 
impedance. What radio's antenna input does that bring to mind?

So far I have found absolutely no evidence that such an antenna ever 
figured into the design of the 390, but I keep fishing.

	Enjoy!

		Bob Camp
		KB8TQ


On Jul 9, 2004, at 1:44 PM, Roy Morgan wrote:

> At 08:38 PM 7/8/2004 -0400, Bob Camp wrote:
>> Truly and almost unbelievable is the ability to be driven in KHz and 
>> put out in KC. It is also rumored that the circuit can be driven with 
>> KC and it will put out KHz ....
>
> Bob,
>
> PLEASE be careful here.
>
> You may start a discussion of the closely related "Cross Field 
> Antenna".
>
> You know, the one which works on the idea that Maxwell's equations are 
> wrong?  Where you can get the performance of a full size antenna from 
> a thing the size of a bread box?  The one which career physicists and 
> antenna engineers don't believe?  The proponents of which, when 
> pressed to explain how it REALLY works, start claiming that no one 
> understands the principles?
>
>> It's all part of the great SI conspiracy ....
>
> By the way, if you want to learn all about how to specify units in 
> standardized form, see this link:
>
> http://physics.nist.gov/Pubs/SP811/
> "Guide for the Use of the International System of Units (SI)"
>
>
>
> - Roy Morgan, K1LKY since 1959 - Keep 'em Glowing!
> 7130 Panorama Drive, Derwood MD 20855
> Home: 301-330-8828 Work: Voice: 301-975-3254,  Fax: 301-948-6213
> roy.morgan at nist.gov --
>
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