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Yuri Blanarovich wrote:
Yuri wrote:
You agree that impedance along the radiator changes, being low at the
bottom, around tens of ohms, to being high at the top, around thousands
of
ohms.

)Tom replied:
)I never said that. What do you mean by reactance? The X can be very
)high but radiation resistance very low even near the open end.

I really give up. What's the point. This is a typical example of Tom's
response to technical argument or trying to go step by step. I am talking
impedance, he "knows" I mean reactance. As I said, I get better response
from a brick wall.
No wonder he duntgetit! Oh well!

Yuri,

Part of communicating is understanding the words the other person is
using. I'm only trying to understand what you intend the words you use
mean.
Please don't blame me for trying to sort out what you are saying. If
you mean "reactance", say "reactance" and not "impedance". If you mean
"through", say "through" and not "across".

Really good one Tom! Why twist and dance?
If you don't know what the impedance is please read 2005 ARRL Handbook: page
4.42 Impedance (re Inductance) and
page 22.1 Impedance (re Antennas)
If we measure current drop from one end of the the coil to the other, we see
current drop across the coil.
(You would love "through" because you can then "prove" that if it flows
through it has to be the same, right?)

When you use "across", I guessed and thought you really meant "through"
or "at each end".

When you used "impedance", I couldn't guess and figure out if you meant
the scalar impedance, vector impedance, resistance, reactance, or what.
It could mean too many things.

I meant freakantance, just could not express it :-)
Nice try! Keep on twisting. Before you didn't get it, now you don't want to
get it.

Let's back off one more giant step back to measurements. Show where W9UCW
was "cheating" in his test setup, pictures and comments at
http://www.k3bu.us/loadingcoils.htm
where he shows clearly that RF current drops significantly across (through)
the loading coil, just like it drops across (through) the resonant antenna
(piece of wire or tubing) from max at the base, to zero at the tip. I
venture to say that (most) everybody knows that impedance of such resonant
radiator is low, about few ohms, at the base to thousands of ohms at the
tip. If you don't know or get that, no point of discussing current magnitude
at the ends of the loading coil.

73 Tom


73 Yuri, K3BU