Re: [amsat-bb] Maximum Mesh Pitch Rule of Thumb

["Edward R. Cole" <al7eb@xxxxxxxxxxxxx>]

Bill,

I have heard both numbers quoted, so if you have at least 1/8 WL holes or
smaller it should perform well.  Obviously 1/10th WL is better.  This rule
also applies to deformations and "bumps and dents" in the dish surface.  At
1296 0r 2400 this not too hard to satisfy.  All TV-sat dishes are designed
either for 4200 or 11,500 MHz, so easily comply.  

At 24 GHz for mode-K its considerably tougher standard since a WL = 1.3 cm
(the surface roughness must be under .13 cm).

73, Ed - AL7EB

At 04:00 PM 5/13/03 -0400, Bill Acito W1PA wrote:
>I remember someone mentioning a rule of thumb for the maximum pitch of
>wire mesh used as a reflector on a dish antenna.... something like the
>"holes" or pitch of the wire should be no larger than 1/8 or 1/10
>wavelength?  What was that value?
>
>Bill
>w1PA
>
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