[TowerTalk] elevated verticals....radial config.

Terry Conboy n6ry at arrl.net
Mon Jun 13 15:14:35 EDT 2005


Excellent points, gentlemen.  Even with a current balun/choke at the 
feedpoint, the coax feedline can easily couple to the antenna & radials and 
skew the pattern.

I've included approximations of my two-story house (stucco, with wire mesh) 
in models of my flagpole vertical, and even though it is 50 feet away, 
there can be significant pattern distortion.  The real world is ugly.

73, Terry N6RY

At 11:44 AM 2005-06-13, Jim Lux wrote:
>Tom's got a very good point. As far as coupling to the feedline goes, it's
>much like just another radial, that happens to go off at some odd angle,
>and typically at some non-tuned length.  You could adequately model it as
>just another wire hooked to the other radials, but in the position
>comparable to the feedline would have.
>
>At 11:26 AM 6/13/2005, Tom Rauch wrote:
>>You also have to watch the feedline and mounting very
>>carefully. When you use less than 10 radials feedline
>>currents start to be an issue. When you use two radials it
>>is a big problem.


More information about the TowerTalk mailing list