4 ms·
TIL that the concave dish surface was actually spherical and not paraboloidal, as I had always assumed.
by gonzus 3y ago
TIL that the concave dish surface was actually spherical and not paraboloidal, as I had always assumed.
- jacquesm 3y agoThe main dish is fixed, they move(d) the receiver around to steer it, with a paraboloidal dish that would not work (because the focal point would be fixed).
- HPsquared 3y agoDid they apply any corrections for the spherical aberration?
- PopePompus 3y agoYes. Initially the receivers had very long linear feeds, because a spherical mirror focuses to a line, not a point. Later additional mirrors were added to partially correct for spherical aberration.