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K0CQ > HELP 05.04.07 15:09l 23 Lines 928 Bytes #999 (0) @ WW
BID : 34299_W0AK
Read: GUEST
Subj: Re: Info, 1/2 Wave End Fed
Path: DB0FHN<DB0RGB<DB0MRW<DB0HOT<DB0ERF<DB0ROF<DB0ACH<DB0ACC<DB0GOS<ON0AR<
HS1LMV<N9ZZK<W4JAX<N4ZKF<KQ0I<W0AK
Sent: 070404/2308Z @:W0AK.#CIA.IA.USA.NOAM #:34299 [Des Moines] $:34299_W0AK
From: K0CQ@W0AK.#CIA.IA.USA.NOAM
To : HELP@WW
The J is nothing more than a 30s era end fed Zeppelin with the
feed line in line with the antenna. Since the feed line section
is balanced it doesn't radiate much (almost not at all). Its a
shorted quarter wave resonator fed near the shorted end. It
connects to the end of a half wave dipole where the impedance is
very high. Since that connected load is high that's not much
different from the open on the other side so its pretty close to
balanced.
The J (pole) was used in the 1930s on VHF, its not new, its not
all that good because it doesn't decouple the feed line from the
antenna so it lets quite a bit of RF run down the coax and
radiate like a really long wire looking radiation at the horizon
when used at VHF.
You asked, "Can it work?" Yes it can, it has for at least 3/4
century.
73, Jerry, K0CQ @ W0AK.#CIA.IA.USA
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