Topband: Receive antennas

[Larry Molitor]

--- Earl W Cunningham <k6se at juno.com> wrote:
> ==========
> The best spacing for a two-element broadside array
> is 5/8-wavelength. 

If your goal is to optimize the picture on your
computer then by all means use 5/8 wave spacing. If
you live 10 miles out from the nearest power line or
computer, there is no question that 5/8 wave spacing
is best. But if you are like most folks who have to
use flags/pennants because of space restrictions, I
seriously doubt if the dominant noise sources are very
far away. In this case 5/8 wave spacing provides
almost NO noise rejection at all. The null is up
around 30 degrees and your noise is arriving at zero
degrees. Use 1/2 wave spacing or about 270 feet on 160
for optimum performance in a typical urban
environment.

I've used both spacings on broadside flags and I can
state very positively that 5/8 wave spacing is useless
in town!

73,

Larry - W7IUV
DN07dg
http://w7iuv.com


	
		
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