Avi,
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Your understanding is correct: The PEC table evaporates when the power is cycled. So you must redo the PEC each session.
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Part of the reason is because of the memory technology used in the older drives.
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Another part of the reason is that the 492-equipted mounts do not have any feedback from the motor/worm assembly (aka encoder or PEC sensor).
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At one point Meade and Celestron (if my old memory isn't failing) used the term PPEC for Permanent PEC.
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Best regards,
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Mark Christensen
