Cecil Moore wrote in message ...
Mark Keith wrote:

Cecil Moore wrote in message

I *don't* expect such a coil to simulate reality. That's the whole problem.
The artificial lumped load software doesn't match reality. It only
approaches reality for "physically small" coils. Once again, a 75m Texas
Bugcatcher coil is not physically small.

It's physically small enough that any error should be small. IE: 1 db
or less.

A 13% error is small? The error is even larger than that for the current
at the top of the coil.

I don't know where this 13% comes from, but how many db difference
would it make in the modeling results? I bet it's about 1 or less. If
you have an 8 ft antenna, with a 1 ft tall coil, no matter what the
current taper is across the coil, it will not drastically effect the
modeling results. At least 3 or 4 people have shown this. The coil is
not a large enough portion of the overall antenna. And any taper of
the current along that one foot section is not going to make a
difference more than about 1 db. Usually less.



Seems to me, if this is
true, there should be a position that places maximum current at the
top of the coil, not bottom.

I have already said multiple times, depending upon where the coil is
placed, the net current into the coil can be less than, equal to, or greater
than the net current coming out. It all depends upon the phasor sum of the
forward current and reflected current. It can be zero or maximum or
anything in between depending upon where the coil is placed. For Kraus'
phase-reversing coil, the net current is zero at both ends and maximum
in the middle of the coil.

I know you have said it multiple times, but so far I don't recollect
anyone actually measuring a real world coil, and finding max current
at the top of the coil. That is what is bothering me. MK