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KG6BAJ > NWSGRP 22.09.09 19:21l 35 Lines 1187 Bytes #999 (0) @ WW
BID : 11716_N1OES
Read: GUEST
Subj: Re: Standing waves
Path: DB0FHN<DB0MRW<DK0WUE<7M3TJZ<PY1AYH<CX2SA<N6RME<KG6BAJ<KG6BAJ
Sent: 090922/0800Z @:KG6BAJ.#NCA.CA.USA.NOAM #:11716 [Grass Valley] InterGate $
** NEWSGROUP: rec.radio.amateur.antenna
** FROM : Cecil Moore <nospam@w5dxp.com>
Szczepan Białek wrote:
> For me it is important that at the end the voltage is doubled: "At the
> open circuited ends
> of a resonant antenna there is almost double the forward voltage".
The same thing happens with an open-circuit stub yet it
radiates a negligible amount. The only place where an
antenna radiates more than a negligible amount is where
the forward and reverse currents are unbalanced.
At the ends of a 1/2WL dipole, the forward and reverse
currents are perfectly balanced, i.e. they are 100%
transmission line currents which are known not to
radiate.
At the 1/2WL dipole feedpoint, the forward and reverse
currents are most unbalanced, i.e. since they are in
phase at the feedpoint, they can be considered to be
100% antenna currents.
This is just one more example of the illogic of
forcing forward and reflected waves into a mashed
potatoes theory of energy. The underlying laws of
physics are lost in the process.
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com
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