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

[David Gilbert]

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 at 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 at 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.
>> _______________________________________________
>>