Mike Speed wrote:

Again, interesting, but what's been outlined so far is not scientific.
For something of this nature to be of any utility, it must be grounded
in science.

I can assure the readers that all the effects I've discussed are soundly
based on very well known principles. Anyone truly interested in the
topic can find ample confirmation of what I've said, although it might
take a bit of digging. The Johnson and Graham text is an excellent place
to start.

What's lacking is good measured data for typical shields, and even
that's going to have limitations because of the wide variations among
cables and manufacturers. But even some rules of thumb will be useful.

But you've shown an interest in the topic. Why don't you make some
measurements of coils made from tubing and from coax shields and report
back?

Roy Lewallen, W7EL