RadioBanter - View Single Post - Current in loading coil, EZNEC

October 21st 04, 12:10 AM

oUsama (Yuri Blanarovich) wrote in message ...
Howdy Antenna NGers,

I took the time to check out the Helix feature in EZNEC 4.08 and modeled the
"worst" case - CB whip or 10 m whip with loading coil - helix half way up and
then the same helix moved up to 3/4 way up. Things will get more pronounced
when more turn, more inductance coil is used and frequencies are lower. Yes,
Virginia there is a CURRENT DROP across the loading coil, unless you have more
"appropriate" or "scientwific" term for it.

Who is Virginia? I've never seen her here. Is she posting under an
assumed name?

which corresponds to REALITY measured, experienced and finally properly (close
enough) modeled. Even M0RON (with apologies if there is call like that issued
:-) can see the nice current drop across the coil displayed in the VIEW.

But does it change the *end* results to any large degree? I really
doubt it.

Thank you Roy (now you believe it?), Cecil, Richard. Now the unbelievers can
even model this case themselves and SEE it properly. So ON4UN, K3BU, W9UCW,
W5DXP, KB5WZI were and are right. W8JI, G3SEK et al are sooooo wrong :-) Some
still persist, some are converted and many will be enlightened.

Some of us could care less. I know that applies to me. I know that the
end results of the modeled antenna won't change to any degree worth
worrying about.
The recommended coil placement positions are not going to change
either.

Now if Roy can incorporate elegant way of modeling real life coil/inductance by
inputing Inductance L and its physical size and have it calculate things
without modeling turns, that would be a winner and a segment saver.

I don't see the point, if the end result of the modeled antenna is
accurate. And it is, as far as I've seen so far.

So after all, those "dumb" hams pointed out 50 years of misinformation in even
ARRL "bibles" like Antenna and Handbooks :-(yep, latest 2005 "revision" still
has it in it)

Uhhh, I hate to break it to you, but the antenna handbook has *both*
descriptions within it's covers. One says the current taper is fairly
constant, and one says it can vary.

Just watch W8JI to massage his web page and twist out of this one (yet another
egg in the face :-)

Who cares what he does or thinks....
You take this stuff too personal I think. Also, you have a tendency to
be overally smartass with some of your descriptions of people, or the
way they think, or the theories they support. Or the names you make up
to call them. IE: You once called *me* Virginia... You can inspect me,
and if you find a female apparatus "taco shaped", or big tits, I'll
give you $1000. You would get much more respect as far as this coil
current taper theory, if you weren't such a frigging smartass about
it. Just state the facts, or what you observe, and leave the horsecrap
and childish names out. Just my opinion. MK