John S wrote:
On 10/13/2014 12:38 PM, wrote:
John S wrote:
Jim is right. There is almost no difference in a V and a catenary as far
as the antenna is concerned.
It would really wind up being an exercise of "can we really model a
catenary?"
If anyone disagrees, we will do it. (NOTE: I said "we", not just me)
It depends on how close you want the model to be, but in general all you
do is break the catenary, or any curve you want, into a series of
straight line segments.
Yes, of course. And, with the free version of EZNEC, one must be careful
not to exceed the max segments allowed.
Not really a problem as it does not take many segments to represent the
ends, which has a slow change, as the center part with a more rapid
change.
If I were going to do it, I would use something like a spreadsheet
to plot the curve then draw straight line segments on the curve and
plug those directly into EZNEC.
The extreme case is modeling a loop as a geometric figure with straight
side.
EZNEC will generate loops with whatever number of sides you want and
thus it is fairly easy to see when increasing the number of sides
gives diminishing returns in the difference between the loops.
--
Jim Pennino