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This isn't exactly for astronomy, it's for satellite sweeping so it's sorta outer space related.
I make parabolic dishes out of wood. They have a coating of aluminium foil (yes the stuff used for cooking) on the surface for RF reflection and are painted so they don't turn the dish into an oven.
The dish mount is similar to a German Equatorial telescope mount but it only moves in R.A. The axle is made from an old bench saw and powered by a windscreen wiper motor from an old 70's Datsun Sunny wormed onto a paper schreder gear.
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