[Elecraft] Center-fed antennas

[Ken G Kopp]

Well-said, Don.

73!

Ken Kopp - K0PP

On Thu, Oct 10, 2019, 16:23 Don Wilhelm <donwilh at embarqmail.com> wrote:

> All this talk of multi-band antennas for Field Day ignores the problem
> of multi-station Field Day operation.
> There is sufficient pickup of one transmitter's energy on the antenna
> being used by a receiver on another band.
> For that reason, my club has banned the use of multiband antennas for
> Field Day operation.
>
> For a single station Field Day operation, the multiband antennas are great.
>
> 73,
> Don W3FPR
>
> On 10/10/2019 5:32 PM, David Lee / Seatools wrote:
> > On Thu, Oct 10, 2019 at 2:06 PM Fred Jensen <k6dgw at foothill.net> wrote:
> >
> >> Yes, however ... a center-fed dipole long enough to be moderately close
> >> to a half-wave at 40 will develop a serious case of acute lobe-itis when
> >> operated at higher frequencies, squirting your RF in a variety of
> >> directions, many of which may not be productive for your intended
> >> objective.  Try, as many have over the years, to design the "magic
> >> antenna" that is very small, provides a 1:1 match on all bands, easily
> >> installed, and exhibits good gain, your effort will inevitably fail.  As
> >> JC Maxwell is reported to have said, "Physics is physics, the rules are
> >> unbreakable."  A log-periodic will give very modest gain over an octave
> >> or more, however LP's hardly fall into the Field Antenna class. [:-)
> >>
> >> 73,
> >> Fred ["Skip"] K6DGW
> >> Sparks NV DM09dn
> >> Washoe County
> >>
> >> On 10/10/2019 1:24 PM, Al Lorona wrote:
> >>> My experience with single vertical or sloping wires is exactly the same
> >> as AB7E's. I have, over almost twice as many Field Days as Dave, come
> to a
> >> similar conclusion, with the slight difference being my preference for
> an
> >> "all-band dipole" fed with balanced line. This obviates the balun and
> >> reduces feedline loss to negligible, so obviously I am maximizing
> >> efficiency at the expense of any other possible advantage. (I can
> usually
> >> hear much better than I can be heard... so thus far this has been a
> valid
> >> decision.)
> >>>
> >>> To sum up what I and what I think Dave are saying, you can't beat a
> >> horizontal, center-fed wire up as high as you can get it. Its
> simplicity,
> >> the flexibility it gives you to QSY (with a good tuner), and its high
> >> efficiency are almost unbeatable.
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