"Mike Coslo" wrote in message
...
Yuri Blanarovich wrote:
"Mike Coslo" wrote in message
...

Roy Lewallen wrote:


If you'll read what Tom has posted, or a description in any good text,
you'll find that the whole circumference of a "shielded" loop radiates.
The field comes from current on the outside of the "shield", not from
some field penetrating the shield. That's my theory. It's the same as
Tom's, and that of every respected author I've read.

Game, Set, and Match, Roy. The explanation and the everyday application
of the concept of non-ferrous shielding are both simple and elegant.

Seems like the thread stopper to me! I suspect it will continue
anyhow.... 8^)

- 73 de Mike KB3EIA -


Before you pronounce your verdict, why don't youze guyze build the
shielded loop antenna as I described and test it. Try version without
shield, see what IS antenna, and try the same antenna with shielded loop.
Then run electric drill or another source of arcing or interference in
the vicinity and see if there is shielding effect or not. Then pronounce
your verdict and pontificate on how electrostatic shields suppose to
work. Otherwise you look silly like W8JI cult worshippers.

Yuri, you is way too intense! I don't pontificate, and my silliness is
genetic, not involved in any worship of W8JI.


Sorry! I didn't mean you specifically, jus' generally those who worship W8JI
gospels.

I very much expect that any effects that you see may be due to another
cause than what you attribute it to. I don't know if your antenna is not
completely shielded along it's entire circumference or not. I wonder if
you could put your antenna inside a Faraday cage and see different
results. Perhaps even try the unshielded antenna in the Faraday cage.

Of course it will not work, Faraday cage - shield, shields all RF.

Unshielded antenna in cage should equal shielded loop in open. If it
doesn't, I'd look for a problem in the experiment first, not a problem in
the theory.

It is electrostatic shield, not "shielded, closed" loop shield. Antenna will
still work the same inside the cage, just will not receive any signals if
they are not passed through the cage. I am not overthrowing legitimate
theories, I am describing what I observed and objecting to call the shield
an antenna, when it isn't!!!

- 73 de Mike KB3EIA -

I have no problem with theories, I have problem with silly claims that
shield is an antenna. I described my experiments, explained behavior and
performance of the shielded loop in the near field interfering
signals/noise.
Build it, if you have problem with local noise, you would see the benefit of
the electrostatic shield on the suppression of it and on symmetry and deep
nulls on other signals. Shield is a shield and not antenna. Rest of
mumbo-jumbo is twist away from the subject and attempt to legitimize
wrongoooo!

73 Yuri Blanarovich, K3BU