• Question: Pls explain lamda / 20 in radio telescope mech

    Asked by YungTingShirley to Hermine on 18 Mar 2018.
    • Photo: Hermine Schnetler

      Hermine Schnetler answered on 18 Mar 2018:

      I think you are referring to the required smoothness of a parabolic dish antenna. Thus it implies that the surface r.m.s error of a parabola typically should be less than lambda/20, which is basically the rule of thumb to make the error negible.

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