Re: Mach2 with CP five jiggling while tracking


Clayton Yendrey
 

Roland,

I don't have an AP mount (on the waiting list for a Mach2), but this sounds very similar to the SDE generated oscillation that has plagued Ioptron's attempt at encoder equipped mounts.  The threads on their issue with this on CN are so numerous that it really deserves its own group... ;-)

Is that any relation to what is occurring here?

"Sub-divisional error is cyclic, occurring with each interval of the scale or scanning pitch (i.e with each signal period), but it does not accumulate and is independent of the scale or travel length. The two primary causes of SDE are mechanical inaccuracies and misalignment between the scale and the read head, although harmonic disturbances can also cause distortions in the sine and cosine signal"

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