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

[Joe Subich, 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"?

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 
 


> -----Original Message-----
> From: towertalk-bounces at contesting.com 
> [mailto:towertalk-bounces at contesting.com] On Behalf Of WA3GIN
> Sent: Saturday, December 08, 2007 9:45 AM
> To: Samir Popaja, 7S7V (SM7VZX); towertalk at contesting.com
> Subject: Re: [TowerTalk] W6NL 40-2CD => Moxon Conversion
> 
> 
> Interesting stuff...
> 
> I wonder how different the beam performance results would be 
> for a similar 
> configuration where the "Moxon" elements are replaced with a 
> simple droppy 
> wire.
> 
> At the club station we have a 40m dipole made from 2" 
> aluminum tubing. The 
> horizonal 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"?
> 
> 73,
> dave
> wa3gin