Re: [TowerTalk] 80 4-square inside a 160 4-square? Pros and Cons please!

[Jim Lux <jimlux@earthlink.net>]

At 11:27 AM 6/11/2004 -0700, Rick Karlquist wrote:
> Jim Lux said:
> > At 09:58 AM 6/11/2004 -0700, Rick Karlquist wrote:
> Then,
> > you put up the 40 m foursquare elements outside the 80m elements, but
> > still
> > spaced an odd multiple of 1/4 wavelength apart (i.e. 3/4lambda, or 30m or
> > 5/4-> 50m apart).
> >
>
> 3/4 wave spacing won't work.
>
> Rick N6RK

Sure, 3/4 or 5/4 won't be quite as nice as 1/4 wave (because of the grating 
lobes), but, in a 4 square configuration, it might not be all that bad, in 
practical terms.  I assume that one would drive it 3/4 wavelength out of 
phase.  A quick simulation shows a few nulls, but they're pretty narrow, 
and I'll they wouldn't be all that deep on a "real" antenna, particularly 
if you had some slop in the phasing.

However, I think the "real" solution is to optimize the system, just like 
you do for a multiband yagi. 

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