[Elecraft] RF in the Trees

[K8JHR]

Hmmm....   vertical dipole... vs... end fed half wave vertical "dipole" 
  - not sure these are equivalent in performance.  I know W8JI thinks 
the end fed half wave needs some sort of ground system-counterpoise to 
keep the feed line from becoming part of the antenna, so I am wondering 
- asking not telling - whether these two are really equivalent?  (He 
said reaching for his ARRL Antenna Book...)

I believe Jim K9YC modeled a true vertical dipole  (including the n6BT 
end-loaded vertical dipole) - but I would expect it to work out 
differently from an end fed half wave vertical.  The GAP antennas and 
Cuschraft R8 and R9 type are supposed to be loaded vertical dipoles, and 
are not, I don't think, end feds... but that is the question... are 
these really all equivalent?  Certainly feeding at the bottom of an end 
fed would be easier from a construction and deployment point of view, so 
I can see the obvious appeal therefor, but then does it work as well as, 
say, the N6TB vertical dipole fed in the middle?

Again, this is a question not a critique.

-------------------- K8JHR -------------------



On 6/26/2014 10:59 AM, Doug Person via Elecraft wrote:
> The K9YC modelling with EZNEC
> <http://k9yc.com/VertOrHorizontal-Slides.pdf> is quite interesting.
> Certainly has me thinking about vertical dipoles.  The half-wave end-fed
> looks like the perfect candidate for a simple vertical dipole.
>
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