So, here's my frequency analysis post resurrected, plus an additional Youtube video on the topic: A poster on the Geotech1 forum found this Youtube video, showing a 'scope examination of the coil drive voltage: https://www.youtube.com/watch?v=E2AYJp2uH2U It's not really worth watching, it's dull and nerdy, and in Russian or Ukranian, I just included it so you know I'm not making stuff up ... So it's broadly similar to the Equinox / DFX , forcing complex square-edged signal
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