[ARC5] QST articles.

[David Stinson]

----- Original Message ----- 
From: "J Forster" <jfor at quik.com>

> The power that goes through the Radiation Resistance (and is hence
> transmitted) is only a tiny fraction of the total current. (Current
> Divider) Most is wasted in losses in the parallel capacitor.

I am not an engineer, nor am I the brightest candle on the cake.
It's possible- even likely- that I just don't grasp this yet.
But it still looks like what J said to me.  If we look at the antenna 
and the parallel capacitor as a single system, and the formula for 
radiated power using radiation resistance, the current flowing
through the radiation resistance at any given instance 
is going to be tiny compared with the huge amount flowing
in the 1200 pF cap.  The I2R loses are only part of the issue.
Take a "snap shot" of the currents and you find little through
the radiation resistance; the 1200 pF is hogging it all.  
The electrical height above ground of that cap is,
essentually, zero.  So, by the formula, 
none of  this current results in radiation.
"Good match" doesn't automaticly mean "good antenna."  
However, if you use a series cap, discounting leakages 
from stray capac. to ground, the current flowing 
through the cap (and every other part 
of the antenna/matching system) is the current flowing
through the radiation resistance, 
so all of it contributes to radiation.
73 Dave S.