Hi Rene, I have spend some time with research about PPEC. The fact is, that it is not usable in Ekos if you also want to use guiding. Those two functions ara fighting against each other. But if I summarize it, how to use PPEC:
1) You will need to record correction curve. For this, you will need to switch from INDI to ASCOM, because INDI driver for EQDir is simple, and it doesn't have this capability.
2) Once your curve is recorded, you can smooth it in PECPrep. This step is optional, but I would recommend to do it.
3) You will need to replay the (smoothed) curve from EQDir under ASCOM. At the same time, you will need to learn the mount the curve. This can be done in Ekos, with one of those two buttons in PPEC tab.
4) Finally, you can enable PPEC during your imaging session. RA periodic error will be automatically corrected by the mount itself, as the correction curve is now recorded in its EEPROM.
As I said, it is way too complicated, and GPG for this purpose is definitely better solution, as it is able to cooperate with guiding.

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