On Mon, 25 Sep 2006 11:19:25 -0700, Richard Clark
wrote:
Several comments. What's with the curious cogging of the SWR computed
from NEC2? EZNEC predicts a quite smooth curve. Your measured values

I looked into this. The feedpoint impedence values Z(f) that NEC2
reports have discontinuities or discrete jumps, causing the predicted
SWR to have the same. I imagine that this is a result of the
numerical approximations and the segmentation used. Does EZNEC report
the oscillations when the frequency increment is on the order of 0.01
MHz? What version of NEC does EZNEC use?

I also tried using the extended thin wire kernel, but it did not help.
Nor did increasing the segmentation.

Thanks,
--John