Re: [TowerTalk] Effect of element shape was: Re: InnovAntennas contact info

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

Yes.  A true Moxon has less forward gain (only slightly so on a proper 
design) and less front-to-side than a normal yagi, but it has a really 
deep notch off the back.  The statement that a Moxon is nothing more 
than a 2 element yagi with bent ends is simply false. There is a phasing 
component that is not purely parasitic.
73,
Dave   AB7E



On 3/20/2013 6:22 AM, Pete Smith N4ZR wrote:
> But don't Moxons have something fairly close to a cardioid pattern, 
> with a narrow deep null off the back?
> 73, Pete N4ZR
> Check out the Reverse Beacon Network at
> http://reversebeacon.net,
> blog at reversebeacon.blogspot.com.
> For spots, please go to your favorite
> ARC V6 or VE7CC DX cluster node.
>
> On 3/20/2013 9:06 AM, W1YW@aol.com wrote:
> > Yeh, you can get better gain, bandwidth AND lower sidelobes. See
> > 'Optimization of Wire Antennas', Landstorfer and Sacher, Wiley 
> > Interscience,  1985.
> >   The Innova designs use end-bends to shrink the projected size of the
> > element. The ends do very little to the radiation pattern in the far 
> > field on
> > those size scales.
> >   Moxon's are nothing more than 2 element Yagis with end bends. There is
> > virtually no coupling at the voltage max's for the driven and 
> > parisitic==so the
> >   ends can be placed fairly close together. Same with spider beams, hex
> > beams,  yadayada.
> >   The Innova design looks like a nice offering for the ham market. The
> > multiband coupling is also well known: Gary Breed (who publishes Hi 
> > Frequency)
> > has a patent on that.
> >   73,
> > Chip W1YW
> > --------------------------------
> >     In a message dated 3/20/2013 8:48:46 A.M. Eastern Daylight Time,
> > n4zr@contesting.com writes:
> >
> > yes, in  a classic yagi with straight and parallel elements that is 
> > true...
> > but when  you bend or make the driven element not a simple half wave 
> > dipole
> > then it can  have an effect on the pattern by  itself.
> > _______________________________________________
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