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From: carpenter@nbs-vms.ARPA (CARPENTER, ROBERT)
Newsgroups: net.ham-radio
Subject: Re: care and (mostly) feeding end-fed antennas
Message-ID: <2325@brl-tgr.ARPA>
Date: Tue, 22-Oct-85 14:03:27 EDT
Article-I.D.: brl-tgr.2325
Posted: Tue Oct 22 14:03:27 1985
Date-Received: Thu, 24-Oct-85 05:48:58 EDT
Sender: news@brl-tgr.ARPA
Lines: 28



If you are old enough (I admit it), you may find a similar feed method
which is the J antenna. It is described in ARRL handbooks from the late
30s to perhaps the early 50s - as a VHF antenna.

I've seen another way of feeding 160 meter verticals. BAck in the late
50s Ev Dillard, W3BKO, got an AM broadcast license for Wheaton, MD.
It just so happened that his FM station, WASH, had its transmitter in
Wheaton. He tried all kinds 
Wheaton. Of course the FM tower was solidly grounded at the bottom, with
no leg insulators - it is a self-supporting tower. He tried all the normal
shunt-feed systems, connecting a little way up the tower, but the impedance
was awful. Finally someone pointed out that the tower was about a half-wave
on 1540 kHz and deeper though was necessary. The least-trouble solution
turned out to be to drive four posts in the ground, perhaps ten feed outside
the tower base and run wires from them to a point a quarter-wave up the
tower. they were then firmly attached to the tower up there. The bottoms
of the wries were connected together and fed as a high impedance end fed
half-wave. The wires formed a quarter-wave stub insulator with the tower.
This system was used for perhaps 15 years. Dillard eventually sold WDON (AM),
and it now uses another loction, sharing a tower with a station on 1050 kHz.

Sorry for rambling.......

Bob, W3OTC

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