[Antennaware] EZNEC Element Correction Factors

Gedas w8bya at mchsi.com
Tue Jan 21 12:57:23 EST 2014

Hello group.  I am trying to model a M2 2M9 for a friend for his rover use. 
I have an EZNEC model (not sure where I got it from) for the M2 2M12.  By 
looking at the PDF manual for the 2M12 and comparing it to the EZNEC model I 
have on hand, I can see that an element length correction factor has been 
applied to each element.  I.e., each element is slightly shorter in the 
model than in real life because the element passes through the boom.

I am puzzled a bit as I noticed that the correction factor varies slightly 
from one element to another.  One element is approx 99.65% of the PDF manual 
length, another element showed up as 99.21%, while a 3rd element showed up 
as 99.38 %.  They are actually all a little different from each other.

I guess I have two questions; is my model of the 2M12 wrong because it shows 
variable correction factors?  And, if the correction factor is required to 
be constant, what should that factor be so I can generate valid models for 
these antennas?

Ok, maybe one more question, what should the correction factor be for CC 
antennas like the 17B2 where the elements are mounted with a clamp on top of 
the boom?  Thank you.

73, Gedas, W8BYA

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