RadioBanter - View Single Post - Dual-Z0 Stubs

Cecil Moore[_2_] · May 11th 09, 11:18 PM posted to rec.radio.amateur.antenna

wrote:
When I look at the EZNEC currents in the bottom 10ft of my 20ft mid-
loaded model there is *NO* current reduction from bottom to top: 1A at
the bottom and 0.99996A at the junction with the coil. So no evidence
of a cosine shape starting at the bottom.

In many center-loaded antennas, the current increases
from the feedpoint through the base section to the
bottom of the coil. Converting that non-cosine current
into an equivalent cosine current with the proper
phasing/delay may take some doing. I don't know of
anyone who has accomplished that feat so far. However,
it would be a very useful algorithm.

One way to do such would be to compare the current in
an ideal transmission line with the current through
the loading coil as reported by EZNEC.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com