David,

Could it be something as simple as the use of a fiber optic cable as an
alternative to a shielded coax cable? I suspect the "without perturbing
.. . ." part may be innocent overstatement. Wish I had a set of
high-frequency probes with fiber optic cables!

Chuck


David G. Nagel wrote:
John Popelish wrote:

Cecil Moore wrote:
(snip)

Other multiple measurements by independent sources agree with
me and disagree with you, Tom. Wonder why you neglected to post
this reference from your own server?

http://lists.contesting.com/archives.../msg00540.html


It is a posting to TowerTalk by Jim Lux, W6RMK. I'll just extract
some excerpts.

"For closewound coils, with length to diameter ratios around 5:1, a
series of fairly careful measurements have been made with the coils
arranged vertically above a ground plane, fed at the base, with a
capacitive load on the other end, and the driving frequency arranged
to be at the resonant frequency of the whole assembly."

Sure sounds like your 100 uH 10"x2" coil installed in a mobile ham
radio antenna environment.


(snip)

The tantalizing part from my perspective is this:

"The measurements were made with carefully designed fiberoptic probes
that were specifically designed to avoid perturbing the magnetic and
electric fields."

I would like to read a full description of this instrumentation.



Like many others I don't know everything. In line with reducing my
ignorance could you amplify on how the phenomena is measured with a
"fiber optic probe". What type of transducer is used to convert energy
of an electrical nature to energy of an optical nature with out
"perturbing the magnetic and electric fields".


Dave WD9BDZ