[Amps] Black heat shields

[Ken Brown]

>
>    It is standard and normal to paint satellite dish faces FLAT WHITE to
> scatter the IR from the sun.
>   
The Smithsonian Submillimeter Array dishes have a special texture to 
their surface to help scatter IR ( and thus not fry the receiver front 
end ) while still maintaining a good enough surface quality to work 
properly at the submillimeter wavelengths the receivers are tuned to. 
The dishes are natural aluminum colored.

> http://en.wikipedia.org/wiki/Submillimeter_Array