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Yuri Blanarovich wrote:
More astonishing than that, Until the "gurus" put their finger on the
coil,
or aquarium thermometer, or RF ammeter, or infrared scope and see that
the
loading coil (in a typical quarter wave resonant whip) is heating up at
the
bottom, being the reality that defies their "scientwific theories why it
shouldn't" - they will keep committing the same mental blunders over and
over.

Yuri,

No one I have seen has every said one tuern can't get hotter than
another turn in a loading coil.

For example, I can take a piece of airdux and short a single turn
anywhere in the coil. That turn and the turns around it will get very
hot, often even melting the form and discoloring the wire, even with
modest power applied in a resoant circuit.

I had my 75 watt Novice rig melt miniductor in certain spots way back
in the very early 60's.


Stop right here. We are talking about perfectly good coil (Hustler 80m
resonator) no shorts between the turns, ne end effect shorting out turns
(and if so, then both ends are the same). Perfectly good coil, with wire
insulation intact, uniformly wound, uniform wire diameter (constant
resistance) good insulation, until wire gets red hot, and covered with what
appears to be heat shrink tubing.
When I applied about 600W to it, the coil obviously started to overhead,
with obvious tapered patter of heat distribution (no shorted turn culprit)
with most intense on the bottom, slowly tapering towrds the top. No signs of
similar "melting" at the top (to blame "shorted" turn from the top cap), nor
anywhere in the middle to indicate shorted turn.
If you do not believe that this could happen, than say so and I will provide
the evidence, I will melt another coil. If you believe and can relate some
of your melting to mirror this case, than please explain what else can cause
this besides the current being SIGNIFICANTLY higher at the bottom than at
the top.
What I know from the thermodynamics, that heat rises to the top. If the
current was (almost) equal, then the coil would be heating up and starting
to melt uniformly, with actually more pronounced effect at the top, due to
the rising and adding heat from the lower part of the coil (no upside Buick
here).
So lets talk specifics of the argument and not detours, please!


The problem is wild theories are created from small grains of truth or
factoids. It is the wild theories that people question.

I question reality that I experienced, claims to the contrary ("it can't
be") and theories rode in support of pro and con.

In an effort to support the wild claims, there seems to be an effort to
dismiss anything but the wild theories. Here is how it goes:
1.) My Hustler antenna loading coil (known to be a poor electrical
design) melted the heatshrink at the bottom

Maybe poor electrical design, but perfectly sound coil, with uniform
insulated wire, wound on perfect cylinder. It was Hustler coil with its
physical properties and heatshrink tubing over the turns that magnified the
effect and attracted my attention.

2.) This must be becuase there is only high current at the bottom of
every loading coil.


I will disregard the rest of your post as a irrelevant crap, typical of your
prior riding in on a high horse, ridiculing and pontificating. If you can
stay on the technical side of the discussion we will continue, if you can't,
then play the "guru" and we are all "stay stoooopid"!

Yuri

3.) This must be because the standing waves on the antenna all wind up
in the loading coil.

4.) This must mean all loading coils act just like they are the x
degrees of antenna they replace.

5.) This is why, no matter what we do with loading coil Q, efficiency
doesn't change much.

6.) We will write a IEEE paper about this astounding fact, since all
the texbooks about loading coils or inductors in general must be wrong

7.) Anyone who point out it is imperfections in the design of the
system that cause this must be wrong, since I saw the coil get hot

8.) Anyone who disagrees with me must think himself a guru, and be
incapable of learning or understanding how things work

9.) I know all this because the bottom of the coil gets hot in my
antenna

What's next? There is less current in a wire (coil) where wire (coil)
gets
hotter?
Thermometers don't lie, meters don't lie, even EZNEC shows it! So
wasaaaaap?

It's all been explained over and over again.

If the termination impedance of the coil is very high compared to
shunting impedances inside the coil to the outside world, a coil can
have phase shift in current at each terminal and it can have uneven
current distribution.

This is not caused by standing waves or "electrical degrees" the coil
replaces, but rather by the displacement currents which can provide a
path for the through currents.

Reg actually explained this very well, as has Roy, Tom D, Gene, Tom
ITM, Ian, and a half dozen others.

The reason you keep beating your head against the wall is you want to
think the conclusions you formed were correct.

If I wanted to design a loading coil that has virtually 100% current
taper, I could. If I wanted to design one with virtually no taper, I
could. I could actually have an antenna of a fixed height and by making
various styles of loading coils go anywhere from nearly uniform
distribution at each end of the coil to some significant taper.

The problem is Cecil attributes it all to standing waves, and not to
the inductor's design. You seem to be doing the same.

Since we won't agree with your wrong theories, you then conclude we are
saying step one is wrong and you never saw what you saw. Step one is
fine. Step two is where everything you say falls apart.

73 Tom