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Reports until 09:24, Thursday 25 July 2019
H1 ISC
jeffrey.kissel@LIGO.ORG - posted 09:24, Thursday 25 July 2019 (50809)
Probably unrelated -- LSC-REFLAIR_B RF27 (3f of 9 MHz, used during DRMI 3f Acquisition?) LO Is Below Threshold
J. Kissel, T. Shaffer, D. Sigg

We found some suspicious diffs in the SDF for ECAT PLC2 (LSC-MOD_RF45_AM_RFSET, LSC-MOD_RF9_AM_RFSET -- which we subsequently found was guardian controlled in ISC_LOCK in states higher that we've been able to achieve -- so now real problem) -- but this led us down the ECAT rabbit hole to find that the LSC-REFLAIR_B_RF27_DEMOD now has its LO signal occasionally dropping threshold. 

A trend of the LO signal for this demod reveals that the LO level had been at 23 (dBm) for times back to August 2018, and then dropped on 2019-06-18 16:21:37 UTC (Tuesday, Jun 18 2019 09:21:37 PDT) to 22.7 (dBm) and then again on 2019-07-16 18:27:50 UTC (Tuesday, Jul 16 2019 11:27:50 PDT) to 21.9 (dBm). The threshold is 22 (dBm).

Daniel suggests that this might be related to the balun replacement. Not enouh to worry about. "We'll fix it by lowering the threshold."
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