View of a small coax with its shield reported to a blue wire, itself soldered to the same trace as the positive supply on the red wire.

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1. F4GRX Sébastien (f4grx@chaos.social)'s status on Friday, 10-Jan-2025 07:17:02 JST F4GRX Sébastien

   in reply to

   @altomare starting analysis of the second board. As suspected, the coax shield is connected to the positive supply, so this oscillator is actually powered by -24VDC to ground... Or, output signal is referenced to +24V. Weird.