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Re: [TowerTalk] Is there a point of diminishing returns on gain for stac

To: KZ4USA <videorov@verizon.net>
Subject: Re: [TowerTalk] Is there a point of diminishing returns on gain for stacking HF beams?
From: jimlux <jimlux@earthlink.net>
Date: Tue, 15 Jul 2008 06:38:39 -0700
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
  KZ4USA wrote:
> Like stacking tribanders or monobanders for HF 10 thru 80? 
> Or does it keep climbing up 3db?
> _______________________________________________
> 

Well.. in free space you get a gain of N, for N antennas.. 2 antennas is 
3dB, 4 antennas is 6dB, etc.

And that assumes they're far enough apart vertically (on the order of 
1/2 wavelength), and that ground reflections aren't a factor (so for 
most ham's systems, which are within a few wavelengths of the ground, 
you can't just stack ad infinitum).


The HFTA program that comes with the ARRL Antenna book lets you experiment.


Jim, W6RMK
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