I'm new to PHD2 and have just been using it on default settings after a calibration and also a run of the Guiding Assistant, I am using a Celestron C8 with f6.3 reducer on an HEQ5 mount (tried with PEC active and inactive) and I am guiding with a ZWO 280mm Guidescope and ASI120MM mini.
I have 2 queries I am hoping I can get advice on:
I am getting the graph below which seems to have a surprisingly regular oscillation in RA error which I cannot get rid of and looks different to other graphs I've seen where corrections seem much more random
I am seeing a strange behaviour when dithering, although I would expect a spike one way or another, the counter movement seems odd and happens after the dither has finished and once the next exposure has started
Any suggestions on what to try to address this would be appreciated please, I'm afraid I didn't record any logs, I can do that next time I have a clear night if this graph isn't enough to troubleshoot from.