[TowerTalk] Breakall short vertical

[Rick Karlquist]

Note that the article talks about the Kintronic
being 1/5 the height of a monopole, but in the
actual tests, it was about 1/3 the height of the
monopole.  Basically, it's just a top hat loaded
cage vertical.  The short height works fine as long as
you have an excellent ground (which they do) and you
can tolerate narrow BW (that's FB on the BCB).

They talk about arrays, but the top hats would be
in each other's territory if you did that.  Might be
able to get it to work anyway, but it would be another
perturbation.

Rick N6RK

Terry Conboy said:
> Kintronic also has a link to a more theoretical IEEE article on this
> antenna:
> http://www.star-h.com/publications/ieee2002.pdf
>
> In the end, this is just a permutation of a short fat vertical with a
> large
> capacity hat.  For short verticals, these work pretty well, but as Tom
> mentions, the ground currents are still relatively high, since the 4 wires
> all dump equal, in-phase currents into a common ground system.  If you
> have
> 120 radials, the ground losses are quite small and the efficiency is
> good.  If you have a more typical sparse ham ground system, the losses can
> be noticeable.
>
> I was surprised that the authors (PhDs, MSEEs, and PEs notwithstanding) of
> these papers don't seem to understand the realities of the ground
> currents.  One of them also conspired to write another paper on folded
> unipoles that propagates the same mischief.
> http://www.dlr.com/dlrweb/papers/nabpaper/Nabpaper.htm
>
> Terry
> _______________________________________________
>
> See: http://www.mscomputer.com  for "Self Supporting Towers", "Wireless
> Weather Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with
> any questions and ask for Sherman, W2FLA.
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>