"Dave Platt" wrote in message
...
In article ,
Jimmie D wrote:

I never could really figure out a windom except that the origional was
just
a flat top that was tuner friendly on all the ham bands.

As I understand it, the original Windom is essentially a vertical
radiator, with an asymmetrical capacitive "top-hat" (which will
probably radiate at least a bit because of its asymmetry), bottom-fed,
working against the station's RF ground. It's simply a form of
Marconi antenna.

The "Carolina Windom" is a very different sort of antenna... AIUI it's
a off-center-fed doublet which (by design) also has some
vertically-polarized radiation from the upper portion of its coaxial
feedline.

Although the two have a superficial resemblance, I believe that the
two types have very different distributions of RF current, feedpoint
impedances, and (probably) radiation patterns and polarization
distributions.

I tried to do an analysis on the antenna several years ago having an LCR
bridge at my disposal and basically I found an antenna built for the ham
bands to be non resonant on any of the ham bands, Had an input impdance of a
few hundred ohms on all the hf bands and the reactive portion of the
impedance could be handled by most tuners. The relatively high feedpoint
impedance probably made it radiate reasonably efficently with even a
mediocre ground system.

I think the top hat may have been eithr capacitive or inductive depending on
which band you were on and/or which leg of the top hat you were talking
about. As I remember an antenna 10 M tall by 10M wide would tune up easily
on all the bands 10 thru 80 but I am curious to what the radition patterns
would look like. I would think they may not be so good on some of the bands.

Jimmie