[TowerTalk] More fun with ground plane modeling

[David Gilbert]

Hi, Jim.

I would agree with that, but I was only referring to feedpoint effects, 
not pattern.  It stands to reason that a vertical dipole would have a 
lower takeoff angle than a ground plane because of the greater physical 
separation of current.

73,
Dave   AB7E



On 9/10/2014 11:39 AM, Jim Brown wrote:
> On Wed,9/10/2014 11:22 AM, David Gilbert wrote:
>> If you think of an elevated ground plane (elevated high enough to 
>> minimize ground coupling effects) as a vertical dipole with the 
>> bottom portion splayed out (which is pretty much what it is 
>> functionally),
>
> Not quite, Dave. A vertical half-wave dipole puts more of its power 
> into low angles than does a quarter wave antenna. I've done a couple 
> of modeling studies to show this, to study the effect of mounting 
> height, and to compare verticals and horizontal antennas at various 
> mounting heights.
>
> http://k9yc.com/VerticalHeight.pdf  and
>
> http://k9yc.com/VertOrHorizontal-Slides.pdf
>
> 73, Jim K9YC
>
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