Cecil,

I downloaded your EZNEC file, and I played around for a while with both
the original and several variations.

There were no surprises for the fundamental frequency case. When I
modeled a real bugcatcher coil, or at least as real as those on the GLA
web site, the current at the top of the coil was 85% to 90% of the base
current. I think it is more typical that a bugcatcher coil is at least 4
turns per inch rather than the 2 turns per inch in your example. I also
attempted to model the coil tested by Tom, W8JI, and reported earlier in
this thread. This coil pushes EZNEC both in terms of the number of
segments and the short length of the segments, but in any case it
appears that his coil when placed in your antenna model has higher
current at the top than you reported.

I ignored the harmonic examples. Who ever said that a coil would be a
lumped inductor when it is operated above its self resonant frequency?
Even your new guru from Mount Olympus, Dr. Teslacoil, does not discuss
such things.

In summary, the world of RF electrical phenomena is still intact. I
don't believe I have anything more to add, and I plan to back to sleep.

73,
Gene
W4SZ

Cecil Moore wrote:
Gene Fuller wrote:

1. I have looked at that figure, and I suspect many others have as
well. There is no information given about dimensions or any other
modeling conditions, so it is difficult to say anything more than,
"Yep, there's a bunch of lines and numbers on that figure."


Information has been added to the graphic at:

http://www.qsl.net/w5dxp/test316.GIF

The associated EZNEC file can be downloaded from:

http://www.qsl.net/w5dxp/test316.EZ