Is there an EZNEC guru in the house?

[Gerald Wolczanski]

Not an EZNEC guru, but I did Google "beam steering yagi" and there is a
plethora of info out there.  Here is one:
                               - - - - -
Neglecting the coupling between the elements, the final pattern of the
array is the product of the "array pattern" and element pattern.
The "array pattern" is what an array of isotropic radiators (no pattern
of their own) placed at the phase centers of the real elements and
phased the same way would have.
 
>From this is obvious, that if you use directional elements (like Yagis),
it won't make sense to steer the main lobe much beyond the element
beamwidth - you will loose huge amounts of gain otherwise! It only makes
sense to steer the beam within the element beamwidth - at the element's
-3dB point, you will already be loosing 3dB!

In an amateur RA setup, for a transit instrument, maybe it would make
sense to make an north-south array of east-west collinear arrays. These
would have a narrow beam in right ascension, but a broad one in
declination - the phasing between the arrays could then be used to steer
the patten in declination.  (the phasing within the collinear arrays
fixed for a meridian beam).

Marko Cebokli
- show quoted text -



On Sat, 2013-06-22 at 14:30 -0400, Iain McFadyen wrote:
> Thanks a million, Nestor!  
> 
> 
> I was not aware of MMANA-Gal, but am downloading now.
> 
> 
> The results show no real change in the forward direction lobe azimuth,
> but significant variation on the rear lobes. Not what I wanted.
> 
> 
> I will continue to experiment to see if I can find a way to skew the
> main lobe.
> 
> 
> Thanks for responding so quickly.
> 
> 
> Iain
>         ------------------------------
>         
>         Subject: Re: Is there an EZNEC guru in the house?
>         
>         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
>         
> _______________________________________________
> Tacos mailing list
> Tacos at amrad.org
> https://amrad.org/mailman/listinfo/tacos