This is a bit OT but it does concern my K3. Hopefully this will not open too
big of a can-o-worms.
As an experiment to try and achieve a very low impedance ground system, I am
using 1 inch rigid copper tubing for my station and Vertical Antenna grounds
and ½ copper refer tubing to tie together
On 7/9/2011 10:02 AM, Clint wrote:
ANYWAY, I know that RF travels on the outside skin of a conductor.
My question is: Does it also travel on the inside skin?
Only if you inject it there [e.g. a copper plug into the end of the
pipe that connects with the inside only]. Similar to coax which
Evening Fred,
If the pipe is OPEN at its ends, would not the current flowing on the
outside of the pipe fold over at the end of the pipe and continue to flow
on the inside skin? The reverse, if you like, of the situation where a coax
feeder is used to feed a dipole / doublet.
73,
Geoff
GM4ESD
Geoffrey Mackenzie-Kennedy wrote:
Evening Fred,
If the pipe is OPEN at its ends, would not the current flowing on the
outside of the pipe fold over at the end of the pipe and continue to
flow on the inside skin? The reverse, if you like, of the situation
where a coax feeder is used to feed a
Point taken Ian, grey cells in reverse gear here :-)
73,
Geoff
GM4ESD
On July 09, 2011 at 19:17Z, Ian White GM3SEK wrote:
No - HF fields cannot propagate inside an open tube because it behaves
as like a 'waveguide beyond cutoff'. Any HF EM field injected into the
open end will only
Yes, as in coax for an example. when transmitting eg via coaxial cable which
is properly installed the rf currents flow on the inside surface and not on the
outside surface. I mention proper installation .. In which case steps are
taken to keep the inside and outside surfaces separate (at
A hollow conductor is not analogous to a coaxial cable. It has no
center conductor. In the case of the hollow conductor (copper pipe),
current will flow on the outside surface only. Skin effect still
applies and works exactly as if the conductor were solid.
73-
Nick, WA5BDU
On 7/9/2011
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