Is there an EZNEC guru in the house?

[Nestor Escala]

Hi Iain!

I'm not a EZNEC guru!. I have only the demo version. But I use the 
MMANA-Gal.


In the link are yours experiments.


http://s1261.photobucket.com/user/Nestor_Escala/library/ki4hlv-experiments


Best regards

Nestor




El 22/06/2013 09:24 a.m., Iain McFadyen escribió:
> Hi Tacoistas!
>
> I'm sure a lot of you are 'making a list,... checking it twice' as you 
> pack everything in your cars and head to your nearest Field Day 
> location for some weekend fun....
>
> ... but if not, is anyone a wizard with the full version of EZNEC? My 
> demo version doesn't allow me to do the experiment I want...
>
> The basis of the investigation is to start with a standard yagi, on 
> any band you like. 144, 430, 2400 MHz... anywhere. Nominal number of 
> directors (5-10 for example), and a single reflector.
>
> Result should be a nice radiation pattern, with the main lobe right 
> down the boresight of the antenna.
>
> Experiment 1. Lose HALF (i.e. one side) of the reflector. Does this 
> affect the direction of the main lobe? Does this pull the lobe 
> slightly left or right of boresight? By how much?
>
> Experiment 2. Restore the correct length reflector, but now offset the 
> reflector by a few percent, left or right. So it is the right length 
> but not properly centred. How does this affect the skew between 
> boresight and direction of maximum gain?
>
> What I am looking for is a small but definite (maybe 1 or 2 degrees) 
> skewing of the main lobe away from the boresight. If the experiments 
> to the reflector don't do it, would the first director perform better, 
> if the experiments were repeated on the director?
>
> The ultimate goal is to find a way to electrically steer the main lobe 
> of a yagi off the main boresight of the antenna. I was considering 
> using PIN diodes to electrically adjust the length of the reflector 
> element.
>
> Are there any existing commercial implementations of this?
>
> Any thoughts much appreciated.
>
> Iain   in 9Y4-land.
>
>
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