Analyzing the time period where we disconnected an ethernet adapter for the EY illuminator (see aLOG 35640) shows that this doesn't impact the lines observed in the VEA magnetometer between 20 Hz and 120 Hz. I attach normalized spectrograms the the magnetometer data, and we do not see any indication of lines increasing or decreasing around the time period that we disconnected the adapter. The time it would have impacted would be 30 - 34 minutes in these spectrograms.

So it appears this ethernet adapter isn't too bad, at least from this short test.

Keep hunting lines...