Rick S, Michael R

The 1k resistors R80, R85 in the FAST path and R71, R76 in the COMMON path were swapped out with 2k resistors to access a full range of gain. The gain in the medm filters for these paths was adjusted from 2048 to 1024 to compensate.

After the box was reinstalled on the table with the original medm slider gain settings (23dB for common, 8dB for fast) we found the UGF had changed and couldn't quite be recovered by using the gain slider. We found that the transmitted PD was low, only reading about 1V, and has been trending down the past few months from 5V. A quick alignment touch up of the periscope mirrors (in vertical) upstream of the ref cav increased the voltage to 2.8, but more work on the FSS path is needed to recover the lost light. We settled at 25dB for common gain.

The RFPD DC signal is dead so we can't compare the reflected to transmitted.