Quote:
Originally Posted by Barrykgerdes
Our G11/Gemini has no problems and runs in the field from the generator that also supplies a number of computers, telescopes, heaters, cameras etc.
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That implies the generator is providing the common ground.
The 240VAC is all on one power board? Not multiple power points which could be on different circuits and floating at different grounds.
Maybe start by opto isolating the ST4 cable (if you can find one of those) between the Gemini and the QHY5. If you can't find one of those, a USB one between the hub and the notebook. You might need more than one, maybe as many as three, or experiment to see which USB most needs it. The QHY5 gets its power from the USB so i guess you can't put an isolator between the hub and it.
Andrew