| SOD | Year | Day of Year |
Time of Day |
Data Impact | System | Description |
|---|---|---|---|---|---|---|
| 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. |
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