Dick Gustafson, Marc Pirello

Yesterday we looked at noisy BALUNS in the PSL rack.  We know that two of these have been replaced in the past.  Panel 2 Slot 2 (79MHz ALS COM VCO), and Panel 3 Slot 1 (79MHz AOM PSL VCO) contain updated BALUNS.  The BALUNS across the top panel have not been replaced, these we did passive testing on.  As expected they are incredibly leaky and potentially susceptible to ingress of stray RF.  We also checked the AOM path for noise and did not find any leakage between the VCO and the AOM.