Gene Fuller wrote:
Cecil,
I just went back and checked the EZ files. The coil consists of 25 turns
over a six-inch length. How does that calculate out to ten turns per foot?

First, thanks for sending me those files. I have never been
able to generate a 4 TPI coil in EZNEC because of proximity
guidelines. How did you accomplish that?

Second, I thought EZNEC stored the design specifications
for the latest created coil and I was mistaken about that.
EZNEC must default to ten turns per foot.

However, the antenna is almost 12 feet tall, not the agreed
upon 8 feet. It would take a bigger coil to resonate an
8 foot antenna at 4 MHz. Bigger coil = more delay.

And I'm not encouraged by those numerous EZNEC guideline
violations. Download http://www.qsl.net/w5dxp/SUPRGAIN.EZ
for an omni-directional 20 dBi gain antenna that violates
the EZNEC guidelines. Incidentally, there seems to be a bug
in EZNEC. When I try to save the segmentation errors to a
file, EZNEC barfs and closes. I can't get a look at all
the errors so I don't know what they are.

I will continue to tweak the files, like adding enough coil
to bring an 8 foot antenna to resonance.
--
73, Cecil http://www.qsl.net/w5dxp