[amsat-bb] Non linear rotator

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?