[Elecraft] Arecibo antenna collapses

David Woolley forums at david-woolley.me.uk
Wed Dec 2 15:55:35 EST 2020


Arecibo was steerable by moving the feed point.  They compensated for 
spherical aberration by using a travelling wave antenna for the feed, 
and later by using a series of sub-reflectors, the latter in the 
gondola.  The spherical aberration is independent of pointing direction, 
which, I believe, is why they went for a spherical, rather than a 
parabolic, shape.

-- 
David Woolley


On 02/12/2020 17:22, Andrew Faber wrote:
> So by moving the cabin and pulling on cables, they can apparently track through about 20 degrees, unlike Arecibo, which is fixed in a spherical shape.



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