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RE: Patchfeed burned up



Professionally, large dishes (spacecraft tracking and radio astronomy) are
painted with flat, white Titanium Dioxide paint. In addition to minimizing
reflections that might cause fires, the paint is chose to minimize thermal
gradients that can distort the dish panels and backup structure. You want
the broad-band absorption  (how much heat you get from the sun at 5-6000
Kelvin) to match the infrared emission (at ~300 Kelvin).

A good amateur choice is flat-white latex paint.

73, Tom

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