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Rear of a machined aluminium Cassegrain subreflector. 68mm diameter with a internally-threaded 18mm boss for mounting. I'm holding it close to the camera to show the engraving which says Machining and Microwaves Edmund 18 inch f.d 0.25

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https://mastodon.radio/system/media_attachments/files/112/640/615/254/304/825/original/f7f5ddd7341b26c4.png

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

    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

    In conversation about 5 months ago from mastodon.radio permalink
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