Re: [IRCA] (no subject)

[Tim Hills <thills@xxxxxxxxxxxxx>]

Hi Terry,

I've seen designs using bundled rods before and his may very well 
perform as described.

But his "Theory" of how and why ferrite based antennas work?

Before I was halfway through reading the link I had to get out my 
tinfoil hat. I have to admit that citing Tesla, Moray and "free energy" 
sets off a Kook alert for me so bear that in mind. He should read more 
of Tesla's early writings when he was still honest enough to admit that 
he could design, build and use his devices he had no clue why they worked.

What strikes me most is the misunderstanding of Field Theory. As pointed 
out in another thread a tuned loop, air or ferrite, does effect the 
local field for some distance greater than it's diameter and can be 
partially absorbed in the windings. Any EM field has electrical and 
magnetic components, if they didn't generators wouldn't work nor would 
the lowly transformer which takes electrical energy, converts it to 
magnetic and back again. A loop antenna with a pickup winding can be 
treated as an unshielded transformer with it's primary excited by the EM 
that it's resonant with instead of an applied current. In a ferrite rod 
antenna neither the coil or the rod alone are the antenna, they interact 
with each other to make the functioning whole in a predictable manner 
using standard Field Theory .

Doesn't matter if the duck is black or white, you can't tell just from 
it's quack and both taste the same rubbed with sage and stuffed with 
rice dressing after being baked at 350  ;)

The idea that a ferrite rod 8" long is going to capture "photons" in the 
MW band provoked an expletive that my Lady heard. She wondered if I was 
shopping for fertilizer online...

True, one of the fundamental ides of Quantum Mechanics is that 
Electromagnetic energy, radio frequencies or Gamma rays, behave like 
waves sometimes and particles at other times. Design an experiment to 
detect light as a particle and you'll find particles, an experiment to 
find light waves will detect waves. In reality light is neither until 
it's detected and it's probably something else entirely anyway. Light 
going through a diffraction grating or properly sized dual slit behaves 
as if it were waves, in a photomultiplier tube or a larger dual slit it 
acts like particles.

The problem with looking for particles (photons) at say 1000KHz is that 
to detect a photon the detector has to be bigger than the photon. With 
light that's easy, you can read this because the rods and cones in your 
eyes undergo chemical reactions because they are much bigger than a 
photon of light, unless your blind and using a reader but I think my 
point is clear.

If Mr. Grahm were using a ferrite rod 300 meters or longer I might give 
some credibility to his "Photon interaction" ideas. Even at microwave 
frequencies where it would be practical I don't know of any practical 
uses offhand.

The Electron spin stuff? The magnetic fields within a ferrite rod even 
in the strongest EM fields is nowhere near enough to flip an Electron. 
Why do you think they need such gawdawful powerful magnets to do an MRI?

I'd think spending more time looking into the properties of the ferrite 
rods themselves would be more enlightening. The composition of the mix, 
grain size, binding agent, how much pressure and what temperature was 
used during forming all contribute to the rod's properties as much as 
it's physical dimensions. A 1/2" diameter rod 8" long may work best at 
ELF or HF depending on the above factors. Using them outside their 
designed parameters in resonant circuits can cause unexpected results as 
I have learned the hard way.

One reason I prefer air core loops for DXing, air is the same at ELF or SHF.

Tim

On 4/10/2011 9:20, tbaugh wrote:
> Hello All
>
> Have been MW DXing&  SWL for 50+ years, so fit the profile it would seem.
> However I am late-to-the-table as far as this group is concerned, having
> just joined this year. This is my first post.
>
> Just recently, I have come across an explanation&  description of the
> Ferrite Sleeve Loop Antenna. Always a sucker for a new antenna, this concept
> seems quite interesting although I don't have the background to evaluate
> this gentleman's claims. Nor just now, do I have enough cores to duplicate
> his work. However, I believe that he is based on the Emerald Isle, so that
> should count for something, tic.
>
> Looking forward to comments on:
> http://www.gmweb2.net/The%20FS%20Loop.htm
>
> Regards Terry

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