[TowerTalk] stacking distances

[Robert Morris]

As Gerald  says, get the books. It's not so many feet just because it's 6 
meters. My feeble brain remembers them talking about wavelength and boom length.

TexasRF at aol.com wrote:
> In general, as the stacking distance exceeds optimum, the mail lobe  
> beamwidth continues to deacrease. The gain does not increase as one might expect  
> because the grating lobe amplitude increases and "eats" the extra apparent gain  
> associated with the narrower main lobe.
>  
> At 144Hz and higher frequency, the added grating lobe amplitude can hurt  
> receive s/n if the lobe sees a noisy power source such as man made noise or sky  
> noise from our galactic center.
>  
> At 50MHz and lower, the background noise is so high that it makes little  
> difference if the grating lobes see these noise sources.
>  
> There are complete chapters and books to read all about this and a good  
> starting point is one of the VHF/UHF manuals if you can find one (all the ARRL  
> manuals are out of print).
>  
> 73,
> Gerald K5GW
>  
>  
>  
> In a message dated 1/2/2009 3:31:44 P.M. Central Standard Time,  
> k9kl at centurytel.net writes:
> 
> What  happens to an antennas pattern 
> 
> 
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