|Subject:||Re: [TowerTalk] 80 4-square inside a 160 4-square? Pros and Cons please!|
|From:||Jim Lux <email@example.com>|
|Date:||Fri, 11 Jun 2004 11:58:05 -0700|
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). >
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.
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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