Hello all. I received this new CEM40EC-NUC mount in August and have seen these guiding anomalies from the beginning. I am operating the mount with the ASIAIR Pro. I have similar guiding problems when using my EdgeHD8 f/10 with a 162 mm FL guide scope or the Redcat51 with a 120 mm guide scope. The PA works fine and the mount performs GOTOs very well and after plate solve it responds to syncing as expected. The guiding calibration seems to be fine. However when guiding, the log shows intermittent large correlated spikes in both RA and DEC whenever the DEC guiding mode is either AUTO, N or S. If DEC guiding is OFF then the RA tracks very well but the DEC drifts as expected.
I am in the process of trying to return this to B&H Photo since iOptron tech support has not responded to multiple help requests. Any suggestions would be greatly appreciated. Thanks for reading.
1) Guide log starting at 21:36 with DEC mode set to AUTO then changed to OFF at about 21:42.
2) Guide log starting at 00:59 with DEC mode set to OFF