Well,
It looks like Dave successfully excited some natural frequencies in the
group for some weekend entertainment. Congratulations.
73,
Glenn AC7ZN

Oh, and by the way, natural frequencies cannot exist without forward,
and reflected...
:-

wrote in message
oups.com...
Oh, and by the way, natural frequencies cannot exist without forward,
and reflected...
:-


If there is reflector (impedance bump) in their way.
If W8JI waves are not reflected or opposed, then they would propagate
merrily into the ethernity and become the law of the RF jungle and other
pagan believers would worship them and praise the radio guru.
Waves have frequencies and sines/cosines, so this is related to antennas,
unless, of course there are those who "know better" :-)
Jus' stirring the pot...

Yuri da BUm

wrote:
It looks like Dave successfully excited some natural frequencies in the
group for some weekend entertainment. Congratulations.

I don't see how there can be any argument. The standing wave
current envelope magnitude pattern pictured in Kraus is a cosine
function where the angle of the cosine function is the number of
degrees away from the feedpoint. If the feedpoint current is 1.0
amps at 0 degrees, the standing wave current magnitude in Kraus'
1/2WL thin-wire dipole has the following pattern.

degrees away
from feedpoint current magnitude
0 1.000 amps
30 0.866 amps
45 0.707 amps
60 0.500 amps
90 0.000 amps

How can anyone defend an argument asserting that standing wave
current magnitude contains no phase angle information? The arc-
cosine of the standing wave current magnitude above *IS* the
number of degrees of phase angle away from the feedpoint. Since
the antenna is an archetypical standing wave antenna, that phase
angle is also the absolute magnitude of the forward and reflected
current phase angles where those phase angles have opposite signs.
--
73, Cecil http://www.qsl.net/w5dxp