Neil G4DBNMysterious Things appearing on my Bambu X1C. Spiders to support hyperbolic Cassegrain subreflectors in the very deep Edmund Optics 18 inch parabolic dishes with f/d 0.25, so the focal point is at the same height as the dish rim. Total pain to illuminate unless you set it up as a Cassegrain, with the feedhorn phase centre right at the dish face centre orifice. These are for 76,122,134 and 248 GHz #hamradio
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