[TowerTalk] InnovAntennas contact info

[David Gilbert]

Some of you folks are confusing elements bent in a vertical plane with 
elements bent in a horizontal plane.   They are not the same.

Besides, the InnovAntennas claim that the rectangular loop elements give 
lower noise, GREATER front-to-side, and "considerably" more gain than 
conventional elements.  Lower noise comes ONLY from a tighter pattern, 
loop elements don't actually give greater gain unless they are open 
enough (i.e., close to square) to act like stacked elements, and I'd be 
surprised if anyone would even notice the effect of a side notch greater 
than the 50 db or so that I've measured on my conventional four element 
yagis.

It may indeed be, as the InnovAntenna web site claims, the use of loop 
elements provides additional degrees of freedom to optimize spacing and 
tuning of a yagi antenna, but I sincerely doubt that the result is as 
significant as they claim ... and without them bothering to back up any 
of their claims with data (modeled or measured ... I don't care) I will 
persist in that disbelief.

73,
Dave   AB7E



On 3/20/2013 5:26 AM, Joe Subich, W4TV wrote:
>
> The Moxon is a good example of the effect of bent elements - gain and
> front to back levels are more typical of a three element yagi but
> front to side is not as good.
>
> One has a two element yagi in which the designer has essentially traded
> front to side and mechanical complexity for gain and feed impedance.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 3/20/2013 7:27 AM, David Robbins wrote:
>>
>> 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.
>>
>> Mar 20, 2013 01:18:45 AM, jim at audiosystemsgroup.com wrote:
>>
>> On 3/19/2013 11:10 AM, Joe Subich, W4TV wrote:
>>>
>>> They give the designer additional degrees of freedom with which to
>>> control input impedance and side lobe structure.
>>
>> I was with you until you said "side lobe structure." I don't claim
>> to know much a bout the design of Yagis, but I'm under the impression
>> that pattern is largely determined by the tuning and spacing of
>> parasitic elements. Am I wrong?
>>
>> 73, Jim K9YC
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