71191402 2025 089 07:00 3 8.01 The ND filter correction and the Calibration range based on 2021 engineering measurements and the NGS 2019 local survey were updated in the onsite data reduction. The net effect of this change will reduce our observed range bias by 11.1 mm 
71191402 2024 064 21:40 3 6.01 Re-seated internal and external BNC cable connectors on ETM 
71191402 2023 285 23:00 2 9.02 Installed GPS antenna splitter for CNS and Rubidium XLDC  
71191402 2023 221 20:00 3 6.01 Replaced ETM power supply  
71191402 2023 202 23:15 1 5.01 Replaced dead start diode batteries  
71191402 2023 089 01:40 1 12.01 Replacement MET4, sn 149703 installed, sn 109197 removed. 
71191402 2022 314 04:00 2 9.02 Replaced Truetime XLDC. Replacement s/n 99173236 
71191402 2022 260 00:00 2 6.01 Operations change to 2900V for all satellites and calibrations  
71191402 2022 231 21:17 0 99 Install new Dell 7920 replacement processor computer with CENTOS7 
71191402 2022 029 18:00 1 12.01 Replacement MET4, sn 109197 installed. Sn 117660 removed from service. 
71191402 2021 161 02:45 1 5.02 Frequency synthesizer s/n 824432 failure. Replaced with FS s/n 2095. 
71191402 2021 147 06:05 1 5.02 Laser frequency synthesizer s/n 824432 installed  
71191402 2021 002 20:15 1 5.02 Laser frequency synthesizer electrically isolated and grounded. 
71191402 2020 312 00:31 1 6.01 Install NASA Engineering Change 3273C. Improved grounding for the Event Timer Module. 
71191402 2020 241 00:13 1 5.02 Install NASA Engineering Change 3395C. Start diode cable upgrade. Noted about a +15ns change in system delay. 
71191402 2020 219 01:30 1 5.02 Install replacement frequency synthesizer. s/n:2095 
71191402 2020 185 19:30 0 5.02 Remove 1 ND from laser transmit insert. Thickness of glass removed is 0.001186 meters. GEODETICS.dat not changed. 
71191402 2020 154 22:00 0 99 Install replacement data processing computer. 
71191402 2019 313 01:10 1 6.01 Discriminator Cable Change. Move Cable 215 from Transmit Non-Delayed Channel-A to Receive Non-Delayed Channel-C. This enabled Receive Energy Recording 
71191402 2019 262 22:30 1 9.02 New CNS clock installed s/n:801019  
71191402 2019 236 19:06 1 12.01 MET-4 replaced. s/n:117660  
71191402 2019 166 02:40 1 5.02 Install replacement laser frequency synthesizer. s/n:824432 
71191402 2018 292 19:50 0 99 Install replacement controller (servo) computer. 
71191402 2018 122 00:00 1 5.02 Install replacement laser frequency synthesizer. s/n:806256 
71191402 2018 021 00:00 2 5.02 Return to 5Hz laser fire rate for all targets. 
71191402 2017 300 18:00 2 5.02 Go to 10Hz laser fire rate for all targets less than LAGEOS1/2 orbital height. 
71191402 2017 292 20:00 3 6.01 Changed time of flight measurement from HP5370B to Cybioms ETM-02 (serial number -012) 
71191402 2017 158 21:00 0 5.00 Move laser chiller from Electronics Trailer to adjacent CMU building. 
71191402 2016 338 02:28 2 6.01 Install new RCC (Range Control Card). 
71191402 2016 327 00:40 1 9.02 Swap CNS Clock with another unit. s/n:80120 
71191402 2016 126 20:00 2 6.01 Install SLR Engineering Change (SCNS-SLR-EC1296). RCCard Upgrade and TCG Removal. 
71191402 2015 200 00:00 1 12.01 MET-4 replaced. s/n:117555. 
71191402 2015 047 00:00 1 4.01 Replace Transmit/Receive rotating mirror with partially mirrored lens. 
71191402 2015 043 00:00 1 4.01 Replace telescope motor and position sensors. Both axes. 
71191402 2014 191 19:30 2 6.01 Swap out HP5370B with another unit. 
71191402 2014 102 02:50 2 9.02 Replacement GPS XL-DC installed. 
71191402 2012 362 20:59 1 12.00 MET-4 Installation 
71191402 2012 310 23:26 1 99 SATTRK and MONITOR software updated on the controller computer for MET 4 support 
71191402 2011 223 04:05 2 6.01 Installation of replacement HP-5370B counter 
71191402 2010 214 19:00 2 9.02 Replacement GPS XL-DC installed. 
71191402 2010 184 00:00 2 5.02 LASER replaced with saturable absorber upgrade.