There is a ~45 Hz wandering line in Hrec that seems to have appeared first in the 22:15 UTC lock on 27/9 (it was slightly below 42 Hz).
There is a clear indication from bruco. There is large coherence with NN Cal channels
The winning channel is the NN microphone (see attached)
Just to add one further visual check, I attach the spectrograms of Hrec and the NCal_NNN microphone, along with their coherence spectrogram, indicating a coherence of 1 all along the wandering line track.
From this entry (#61814), this line seems to be related to the Calibration activity that started on 26 September and concluded this morning at 08:14:20 UTC.
