http://elecraft.85.s1.nabble.com/K3-S-meter-oddities-tp6676870p6729274.html
Yup ... I was wrong again, but the trouble is I can't figure out why. I
off-center feed in the past and gotten an end-fire pattern. As soon as
> Sorry to interject, but a fullwave fed at the 25% point has a clover
> leaf pattern. It only has the two halfwaves in phase colinear
> behavior when fed very near the center. Even fed at 45% it has a
> significant cloverleaf lobe and a NULL in the center Easy to verify
> with any modeling program. 73, Guy.
>
> On Wed, Aug 24, 2011 at 8:37 PM, David Gilbert
> <
[hidden email] <mailto:
[hidden email]>> wrote:
>
>
> Yes, Don ... you are totally correct. For some reason I was thinking
> about a full wave antenna fed at the 25% point (I have built such
> antennas before), which looks like two colinear half waves fed out of
> phase. The current phasing along the antenna would indeed be much
> different and give a cloverleaf pattern if it were end fed. I
> wholeheartedly apologize for any confusion I may have created.
>
> 73 and thanks for catching my mistake.
>
> Dave AB7E
>
>
> On 8/24/2011 3:23 PM, Don Wilhelm wrote:
> > Actually Dave, a full wavelength wire will have a " 4 leaf clover"
> > pattern - that is neither broadside to the antenna, nor off the
> ends.
> > Check out the pattern for a 1 wavelength long wire in the ARRL
> Antenna
> > Book. The maximum radiation is about 28 degrees from the wire - the
> > radiation from the end is almost zero.
> >
> > The elevation angle of maximum radiation is similar to a half wave
> > dipole - about 15 degrees with a lesser lobe at 45 degrees (that is
> > for a wire 70 feet high, at lower heights, the angle will be
> greater).
> >
> > 73,
> > Don W3FPR
> >
> > On 8/24/2011 5:34 PM, David Gilbert wrote:
> >>
> >> I'm not sure I see the advantage. A full wave end fed antenna
> would
> >> theoretically have the same very high feedpoint impedance, and
> would
> >> additionally blow most of it's radiated energy at a fairly high
> angle
> >> off the ends of the antenna instead of broadside at a lower
> angle. If
> >> you find it that easy to tune, I suspect that electrically it
> really
> >> isn't that close to a full wavelength ... possibly because of
> coupling
> >> to earth (if it is low) or nearby structures. Either that or
> there is a
> >> lot of loss in the system somewhere.
> >>
> >> 73,
> >> Dave AB7E
> >>
> >
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