Okay, I think with your help I have got the settings right.
SDI Loop is connect IN/OUT to deck-IoHD
Gen10 525i29.97 to both deck and IoHD
Deck set to:
OUT REF – REF (if I set it to Input video the video freaks out!)
PP.EE/PB – is set to PB when ETT (seems like it needs to be on PB.EE for capture or else I’m getting dropped frames)
I think it was the PB setting that was causing the problem with the ETT. I’m now getting the beautiful blue ref light back when the ETT goes into recording and in the AJA CP I can see that genlock is using Ref In
Just to confirm – when doing a capture it never comes back on, it that normal.
Thanks again for your help.