Isn't that what they did to Hubble originally?
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 9/15/2020 5:41 PM, Drew AF2Z wrote:
That's funny, I was also thinking of astronomy-- the
Schmidt-Cassegrain telescope where the inherent aberrations of the
relatively simple spherical mirror is corrected (pre-distorted?) with
a lens...
73,
Drew
AF2Z
On 09/15/20 18:39, Fred Jensen wrote:
Didn't the term "pre-distortion" originate in the astronomy world
where one creates an artificial star with a powerful laser, and then
distorts the telescope mirror in real time to minimize atmospheric
effects [twinkling]? That also reduces the twinkle on real nearby
stars too. Maybe that's something else. Pre-emphasis/De-emphasis in
FM broadcast [and analog land mobile FM] is sort of pre-distortion too.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
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