Tom Donaly wrote:
You'll find, though, that the difference between a
continuously loaded antenna and an antenna with the loading coil,
say, halfway up from the feedpoint won't amount to a hill of beans.
Wrong! Bragging rights after a 75m shootout are worth a lot more
than a hill of beans. A helical antenna has NEVER beaten a center-
loaded antenna in a 75m shootout. And in fact, my junk box *top-
loaded* antenna beat all the center-loaded bugcatchers in one of
the CA shootouts. The current below the coil is the highest current
in the average 75m mobile antenna. The longer that uninhibited
section is, the stronger the radiated signal, thus my success in
the shootout. My bottom section was about ten feet long, then a
horizontal coil and horizontal top hat. I'm going to refine that
configuration when I get time.
There's still no such thing as a "current drop."
The decrease (drop) in current across a loading coil installed in
a standing-wave antenna does NOT in any way violate Kirchhoff's current
law. One can imply from Kirchhoff's current law that there is no current
decrease (drop) across a point. I don't know anyone who disagrees with
that so any argument is just a straw man. Kirchhoff never said the
current at one point in a network had to equal the current at another
point in the network.
Many patches have been added to the DC circuit model to try to adapt
it to RF networks. Some function after a fashion and some fail utterly.
We all need to be able to recognize the difference. For EM waves, the
E-field and H-field are often affected in the same way. Saying that
the E-field voltage drops but the H-field current doesn't drop is
simply nonsense. Likewise, saying that the H-field current flows and
the E-field voltage doesn't flow is nonsense. The E-field and H-field
are usually inseparable.
--
73, Cecil
http://www.qsl.net/w5dxp
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