[Elecraft] 80 Meter Verticals

[Vic Rosenthal]

Theoretically the more top loading you have, the higher the radiation resistance and the better the efficiency. So I like the T better than the L. 
I used to have an open wire fed doublet which could be switched to T configuration. It was very helpful to switch between horizontal and vertical polarization on 80 meters.
-- 
Vic 4X6GP

On February 28, 2017 1:13:17 AM GMT+02:00, "Dauer, Edward" <edauer at law.du.edu> wrote:
>A question that’s admittedly a bit OT – though if I need a pretext, the
>rig to be used is a K3 . . .
>
>I have been reading through the usual texts about vertical antennas for
>80 meters, to replace the half wave dipole I now have and the Vee I had
>but didn’t like.  But I have not yet found the answer to one question I
>am thinking about:  The advantages or disadvantages of an inverted L
>compared to other variations of the top-loaded vertical.
>
>Assume a 40-foot ground-mounted vertical section made with wire running
>up a fiberglass mast.  There could be a remote tuner or balun at the
>base if it’s needed.  The top of the vertical section would be guyed
>with four lines more or less parallel to the earth extending from the
>top tip of the vertical section to four suitably located trees.  That
>physical configuration offers three kinds of options.
>
>One is an inverted L.  One of the four guy lines would be a wire making
>the L and long enough to have the overall antenna resonate, with
>nonconductive line from there to the tree.  The other three guy lines
>would be nonconductive for their entire length.
>
>Another would be the classic top-loaded “T” vertical.  Two opposing guy
>lines would be equal-length wire out far enough to achieve resonance,
>with the other two nonconductive for their entire length.
>
>A third would be something closer to a capacity hat.  All four of the
>guy lines would start at the tip as wires, of equal length and just
>long enough to effect resonance, with nonconductive rope from there to
>each of the four trees.  This variation might also have a square loop
>connecting the distal ends of the four top wires.
>
>If the goal is to have the highest efficiency and the lowest net
>radiation angle, and if the height of the vertical section is fixed and
>the radial system is the same for each choice, does it matter which of
>those three or four options is chosen?  And if it does, how come?
>
>Thanks in advance for any lessons offered . . .
>
>Ted, KN1CBR
>
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