Re: [TowerTalk] W6NL 40-2CD => Moxon Conversion

[David Gilbert <xdavid@cis-broadband.com>]

Agreed, and the tip coupling configuration is fairly critical to the 
performance.

Antenna and modeling guru L.B. Cebik, W4RNL, has written a complete book 
(I bought it) as well as several design and analysis articles on Moxon 
antennas.  They would make good reading for anyone planning to build a 
Moxon antenna.  The articles are posted on his website at 
http://www.cebik.com/radio.html ... scroll down to the section on upper 
HF yagis and relatives, about 40% of the way down the page. 

He also has a couple of articles on VHF Moxons further down, and I would 
think the improved bandwidth might be a large plus on those bands.

By the way, for those wanting a 40m Moxon out of the box, OptiBeam sells 
one.  Like most OptiBeam antennas it is built quite sturdy, although it 
is for sure not inexpensive.

73,
Dave  AB7E



Joe Subich, W4TV wrote:

Results will not be similar to the "Moxon."  The Moxon uses 
the tails to force current (increase coupling) between the 
two elements.  It is the extra coupling that increases current 
in particularly the reflector and is responsible for the extra 
efficiency of the Moxon design compared to a conventional two 
element yagi.  

73, 

  ... Joe, W4TV 



> > At the club station we have a 40m dipole made from 2" 
> > aluminum tubing. The horizontal element is 40ft, split in 
> > the center and fed directly with 52 ohm coax. At the ends 
> > of each of the 20ft pieces of  tubing is #10 wire about 
> > 16ft long, but trimmed  to resonance.  Except for guy wire 
> > clearance or ethetics wouldn' t this configuration yield 
> > similar results as the "MOXON"?
> >     
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