[amsat-bb] Non linear rotator

[Phil]

Thank you for reading this.

I'm trying to devise an equation to correct the rotation of my non linear 
rotator. It's correct in the middle of its range but out at both ends of its 
travel. I asked this same question ten years ago and someone kindly told me 
about a simple Window application that did exactly want I wanted.

I have searched through my e-mails back to 2000 and cannot find the reply. 
Can anyone, once again, suggest a suitable Windows or a Linux application?

-- 
Regards,
Phil