2019-02-26 12:34:55 luis.sanchez@LIGO.ORG
    02/26/2019 - CIT - Modify (N.A.)
        02/26/2019 Luis Sanchez Modification Description
            CLF RFPD modify to 6.25MHz by using a LT6202 and 5.976µH inductor. This unit has a board with D1101124-v3, C38 was removed and a piece of wire short the pad to LT6202. L7 was removed and the inductor 5.976µH was set in this place.

2019-02-26 12:39:24 luis.sanchez@LIGO.ORG
    02/26/2019 - CIT - Test (N.A.)
        02/26/2019 Luis Sanchez Modification Description
            Test was perform following T1200335.
            Calculations were done to verify results T1900075.

2019-02-26 12:39:55 luis.sanchez@LIGO.ORG
    02/26/2019 - LHO - Transfer (N.A.)

2019-02-27 19:07:16 rich.abbott@LIGO.ORG
    02/27/2019 - LHO - Modify (N.A.)
        02/27/2019 Rich Abbott Modification Description
            Unit received at LHO, and will be used in the LHO Squeezer CLF application.
            
            Found C22 was burned up.  The installed unit was a 1uF tantalum capacitor that was filtering the -18V supply into the regulator.  Replaced with a 1uF electrolytic (50V).  Shortened the leads on the hand wound inductor used to resonate the photodiode capacitance, and added another turn.    Used C26 (~2-40pF trimmer) in parallel to the photodiode capacitance to adjust the resonant frequency to exactly 6.25MHz.  Remeasured the shot noise equivalent photocurrent (SNEP) to be 10.5uA

2019-10-29 15:27:10 marc.pirello@LIGO.ORG
    10/29/2019 - LHO - Select Activity (N.A.)
        10/29/2019 Marc Pirello Modification Description
            These seem to be slew rate limited.  We replaced LT6200 with LT6200-10 to increase slew rate.