On Tue, 31 Mar 2009 22:27:57 GMT, Owen Duffy wrote:

I will have to revisit the comments in this thread and tie them to the
cogent points of your page.

Constructive comments are always welcome, and appreciated.

Hi Owen,

I can well appreciate the issue of common mode driven by coupling to
the field. The work-arounds I would have expected Roy to have offered
would have been a combination of the TL faculty of NEC for the
differential mode, and an appendix-like wire to support the common
mode contribution. The lack of this discussion where it often appears
in other threads leaves me to wonder if other issues are being
discussed here; hence my problem with topic focus.

As for the modeling of a coaxial transmission line by wires, I have
fairly convinced myself that that approach is thoroughly dead (having
seen no contrary response to my comment about the concept of a Faraday
Shield being unknown to NEC).

By these two, it would seem that modeling coaxial components in NEC is
intractable and claims applied to their use will only be
proven/disproven in the lab or the field.

Proceeding from this last conclusion, I cannot see any purpose to the
comparison of the two colinear representations. You certainly bring
many issues to bear, but except for vague references that are 60 years
old, I don't see any solution to your original questions (which is
where I thought the focus resided).

73's
Richard Clark, KB7QHC