On Tue, 28 Jun 2005 15:39:57 -0700, Frank Gilliland
wrote:

Often common mode currents are also rich in
harmonic energy and that is what reradiates and cause TVI and
interference.


Hogwash. Harmonics don't just appear because of common-mode currents.
They must come from a source -- i.e, the transmitter. And conductors
of common-mode currents don't have any magical properties that let
them conduct or radiate harmonics any better than the fundamental
frequency. That's RF voodoo.
*****

Harmonics are not there due to just common mode. My mistake there.

What I was thinking and what I wrote were not well alligned.

To generate harmonics off a the shield of the coax from an external
induced current, one needs a means of rectification. That can come
from two dissimilar metals that are not properly electrically
connected. Then the shield can become a radiator of externally induced
currents. It is the diode effect of two dissimilar metals that is the
source of harmonics.

james