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Hi Andrew, I am sure periodic error has nothing to do with this problem.
Start tracking, and it will immediately start to fall behind as it were. The drift starts as a straight line, and continues that way for as long as you keep tracking, joined after a couple of minutes by the Dec error drift,[ in
a different direction of course]. You will of course see the effects of P.E.
on that straight line. The line is not really drift at all; it is just that the tracking is not keeping up. I still need to know whether stepper motors can run slow, or whether they either run at the commanded speed, or not at all.
raymo
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