Yuri Blanarovich wrote:

Just got the 20th edition of ARRL Antenna Book and the "thing" about current in
loading coils is perpetuated in it.
Actually, book contradicts itself. On page 16-4 Fig 7 shows rough current
distribution with center loading, showing drop across the coil.
On page 16-7 Fig 10 "sticks" to no drop in current across the coil, proclaims
"stretching" the current by the coil.

That's what happens when someone gets seduced by the steady-state model
and ignores the component forward and reflected waves.

What is important is the delay (phase shift) through the coil. That delay
can be measured in a circuit without reflections and then applied to a
network with reflections.

A little deductive reasoning should resolve the issue. Assume the current
is unchanged through the loading coil feeding a 6 ft stinger on 75m. That
6 ft stinger has a certain impedance. So if the current out of the coil
is high, the voltage out of the coil must also be proportionally high. That
would increase the voltage at the end of the stinger. Is the voltage at
the end of the 6 ft stinger very much higher than the voltage at the end
of a 1/4WL monopole driven by the same power?
--
73, Cecil http://www.qsl.net/w5dxp



-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----