[Elecraft] Why predistortion ?

[Fred Jensen]

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