On Thu, 30 Jun 2005 00:45:25 GMT, james wrote
in :

On Wed, 29 Jun 2005 17:17:53 -0700, Frank Gilliland
wrote:

That's basically what Lance said, just in different words. So what's
the problem?
*****

I have problems when people state "current flows". That is not
actually true.


So current -doesn't- flow?


Power in the electromagnetic wave that flows down a
transmission line and currents on the center conductor and outer
conductor are dependant on the E and H fields of the wave within the
transmission line at any point on the transmission line.


Those E and H fields are created by voltage and current introduced
onto the conductors. A transmission line simply establishes a kind of
self-propogating 'symbiosis' between the fields and the current &
voltage on the conductors. Current does indeed flow on those
conductors -- if it didn't they wouldn't be necessary.


outside that I think we are primarily in agreement.


What you are missing is that different things happen on the outside of
the coax than what happens on the inside. And what Lance was pointing
out (if I may be so bold as to speak for him here) was that currents
on the outside of the coax can screw up things when you try to measure
what's happening on the inside.







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