...
I also note that the vertical velocities are quite small and don't vary, indicating both that the set-up crew did a great job of leveling the towers and that a turbine wake is not visible (expected since the winds were generally from the wrong direction).
Maybe HOWEVER, the Gill at 12 s12 is bad? . When I rserial to it, I get binary gibberish. A wrong baud rate or something? I have now checked (using minicom) that this isn't a baud rate issue. I've also verified that "tp4" shows the same settings (120ohm termination, normal slew) as for s13, which is working. (I also played with these settings and didn't noticably change the signal.) I conclude that this is not a problem with DSM settings, but a cabling issue or something in the Gill itself.