Front face of a machined aluminium hyperbolic 68 mm diameter subreflector for a Cassegrain microwave dish antenna. The surface is very smooth but not highly polished

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   Neil G4DBN (g4dbn@mastodon.radio)'s status on Wednesday, 19-Jun-2024 11:45:34 JST Neil G4DBN

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   And this is what the printed Thing is for. Three carbon fibre rods flare outwards from the three sockets and go through metal sleeves to a support ring behind the dish. There's an M12x0.5 mm thread inside the hyperbolic sub for fine focus adjustment. One turn is a fifth of a wavelength at 122 GHz #hamradio