[TowerTalk] Dual Driven Elements for 4 Element 40m Yagi

[David Gilbert]

Someone recently posted a query about an EZNEC model for the M2 
4-element yagi with dual driven elements.  I misplaced the posting, but 
if the requester is interested in modeling 40m dual driven elements in 
general, rather than the M2 antenna in particular, it might be 
worthwhile using the dimensions from the OptiBeam OB4-40 to load into 
EZNEC.  I've done that with other OptiBeam antennas and gotten very good 
correlation with real life results.  Many of the OptiBeam manuals are 
available from 9K2HN's website, and some were even contributed by DF2BO 
himself.  The OB4-40 is at

www.9k2hn.com/ob4-40.pdf

The phasing line between the two driven elements is pretty 
straightforward to model, and there are a couple of different ways to 
model the decoupling stubs on each side of the elements.  I can help 
with the OB4-40 model if that would serve the purpose of the requester, 
but I don't have any knowledge of the M2 version specifically.


73,
Dave   AB7E