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Patchfeed burned up

Hello all,
Hermann, OE5HFM had a mischief with his homebrew patchfeed. He has left his
antenna unintenionally parked pointing south and with 30 elevation. Next
day he did not hear anything from AO-40. When inspecting his antenna, he saw
the burned-up feed. The feed had a plastic cover which can be seen on the
winter picture. See pictures at www.dj1km.de/oe5hfm/. Text is in German but
the pictures speak for themselves.The sun has travelled through the focus
of the antenna on a bright sunny day, causing this damage.
He has left the dish blank, only covered with clear plastic spray. To
prevent similar for the future, he will now paint the dish. Question is
which color? Any recommendation?
 Reinhard, DJ1KM

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