RadioBanter - View Single Post

March 17th 06, 04:07 AM posted to rec.radio.amateur.antenna

wrote:
Cecil Moore wrote:
wrote:
I'm suprised you wouldn't want to learn more about measurements.
I'm surprised you wouldn't want to share your engineering
knowledge, e.g. is it really possible to use a phaseless
signal to measure phase shift? If so, please enlighten us.
I can't figure out how to do it. Since you apparently have
figured it out, please share your knowledge with us.

I think you are the one with a problem, not me. I don't know what a
"phaseless" signal is. Does it come from a phaseless signal generator
through phaseless transmission lines??

I don't see anything Roy said that disagrees with what I measured, so
that's a non-issue.

Roy and I have previously agreed with your measurements. It's
your conclusions about those measurements that he apparently
doesn't seem to understand and neither do I. I'm certainly not
speaking for Roy, but when he points out to you that my
measurements agree with EZNEC, one wonders what that means
in reality.

I haven't seen Roy question anything and he hasn't told me he doesn't
understand anything.

Can you requote his post where he said that, or should I take your word
for that along with the phaseless signal??

"Phaseless signals". What an imaginative creation. If you measure zero
phase angle between two points, you *have* measured the phase shift
between them, and it's zero. Sounds like what Cecil is looking for is a
way to measure a non-zero phase shift when the phase shift is in fact
zero, to make it fit his theory. Sorry, it's zero. Period. If that
doesn't fit the theory, then the theory is faulty.

I said that Cecil's phase measurements agree with EZNEC (and generally
accepted theory) -- there should be almost no phase shift in the current
along the wire. I also said that I couldn't say whether his amplitude
measurements are correct, since Cecil didn't say (at least in the quoted
posting I saw) what the positions along the wire were, just their
distance from each other. But it's a trivial thing to model with EZNEC,
so anyone can easily see and judge for himself. With an antenna that
simple, any disagreement between EZNEC and measurements is almost
certain to be due to either measurement error or failure to make the
antenna like the model, e.g., prevent common mode feedline currents.

Roy Lewallen, W7EL