The RF source signals became dirty. This is currently under investigation.

In the past Friday I was checking the electronics at the field racks as a part of the power recovery activity. And I found that the RF source signals from the RF distribution amplifiers had become dirty -- there are lots of harmonics lines and cross-talks (see below). If I remember correctly those were not seen when we tested the RF stuff in the last Month [1][2] and therefore something must have happened since then. The raw data files are attached as well.

Figures: output from the 24 MHz RF amp (figure 1), 9 MHz RF amp (figure 2) and 45 MHz RF amp (figure 3).
 

[1] LHO alog 5854 "Installation and Checkout of RF signal chains on ISCT1 and HAM1"
[2] LHO alog 5849 "The 9MHz amplifier box is back"