Richard,
"this can't be" because "gurus" know otherwise.
Why do you hate Tom? You don't like anything he says on his "myth
overturning" web pages. He describes in a such detail and explains that
"shield is an antenna" - why don't you get it? :-))))
According to Tom, RF gets induced on the outside "wire" of the shield, then
it crolls to the "inside" wire of the shield around the edge of the tubing
and sees another wire and jumps over, and then to coax.
If tubing or shield was the antenna, then it would receive DX and near field
signals the same way. The fact that shield is shielding the near field
signals should make any guru wonder.
There was ZS1 on TopBand reflector reporting that he used shielded loop and
other loop antennas, and shielded loop was the only one that suppressed the
local TV birdies. Tom "explained" to him "how things work" and he apologized
that he did not mean to have this as an example of what I was saying.

There are other examples where shield "doesn't shield" - like link coupling
made of coax with end shield open and center conductor soldered to the
shield. As I mentioned I have magnetothermia machine that produces about
200W from single shielded loop, according to Tom, it should be frying the
coax in the gap, with all that RF power trying to make the corner :-)

There is more nonsense on his web site.

73 Yuri, K3BU


"Richard Harrison" wrote in message
...
Tom, W8JI wrote:
"Absolutely nothing, neither electric nor magnetic, couples through the
wall of a conductor several skin depths thick."

That`s wrong for a "Faraday screen".

Terman is right. At the bottom of page 38 of his 1955 edition he writes:
"It is possible to shield electrostatic flux without simultaneously
affecting the magnetic field by surrounding the space to be shielded
with a conducting cage that is made in such a way as to provide no
low-resistance path for the flow of eddy currents, while at the same
time offering a metallic terminal upon which electrostatic flux lines
can terminate."

An example exists in the AM broadcast stations I`ve worked in. Every
tower was coupled to its transmission line through a 1:1 air-core
traansformer. Two identical single-layer solenoids sharing the same
axis. Between the coils was a metal picket fence. One end of the pickets
was firmly grounded to the coupling cabinet. The other end of all
pickets was an open circuit. Electric lines of force were intercepted by
the pickets and directly shorted to ground. However, the fences had no
effect on the magnetic coupling between them because the open circuit at
the ends of the pickets prevented circulating currents which would have
opposed magnetic coupling according to Lenz`s law.

Voila! Magnetic coupling but no electrostatic coupling between coils of
a transformer.

It`s time for W8JI to turn-off his misinformation machine.

Best regards, Richard Harrison, KB5WZI