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What is the worm period on the EQ8-R (If that is any different to the older EQ8) You would need to train the PEC for at least a full worm cycle. The EQMOD PEC trains over at least four worm cycles to average out the corrections (Might be 5) And yes, you will need guide commands to the mount to train it.
That said, there would not normally be PEC on the Dec axis, that should only be getting guide pulses to deal with the PA not being quite right or a bit of wind moving the scope off target and similar errors, it does not run continuously at a theoretically fixed rate like the RA, so periodic error is not as important.
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