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Old April 13th 06, 08:30 PM posted to rec.radio.amateur.antenna
 
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Default Current across the antenna loading coil - from scratch


Yuri Blanarovich wrote:
vs. "experience" = it can't be, but, but, but... ("proof")
how does the coil have higher current at the top if it loses radiation
through capacitance to W8JI? "Experienced" silencio!!! There is your sign!
Yuri da BUm


Yuri,

It is so obvious to anyone experienced with antenna tuners how that can
happen I really dodn't think it requires an answer at all.

It is possible to build a "current step up network", or a "current step
down network" with two or more reactances, one in series and one in
shunt.

What it is NOT possible to do is make a coil change current without
that third path to the outside world. Standing waves will not do it,
missing antenna degrees will not do it.

Look at a simple L network when you have time, or more closely an L/C/L
T network. You will find all laws of charge conservation are met. The
current at any junction of one source path into two other branches
always totals zero (current in balances currents out).

The antenna is no different. The loading coil in a normal antenna mode
might have a somewhat large phase shift in current of the coil has
considerable shunt capacitance to the outside world or it might have
almost none. This has NOTHING to do with standing waves causing the
difference, or missing antenna degrees causing the difference.

There isn't anything mystical or magical about any of this. The only
problem is Cecil's theory, Barry's theory, and your idea doesn't fit
all systems, and the models and workings presented by Reg, Roy, Tom,
Ian, Gener, and others does work in **every** situation.

I can make a mobile antenna that is resonant, change nothing but the
coil, and have a mobile antenna that is exactly the same size and still
resonant with different currents and phase of currents at both ends of
the loading coil. I can do this simply by changing the coil's
capacitance to the outside world.

I can prove this.

73 Tom

 
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