| SOD | Year | Day of Year |
Time of Day |
Data Impact | System | Description |
|---|---|---|---|---|---|---|
| 75010602 | 2024 | 192 | 11:00 | 2 | 9 | PMT cube receive cable |
| 75010602 | 2024 | 151 | 18:21 | 1 | 9 | XL-DC replacement with a spare one |
| 75010602 | 2023 | 192 | 13:26 | 1 | 6 | ARSU (amplifier Receive Select Unit ) was replaced with the upgraded unit. |
| 75010602 | 2023 | 191 | 10:20 | 1 | 6 | PMT power connector and power cable inside PMT was replaced. |
| 75010602 | 2023 | 057 | 11:27 | 2 | 0 | Calibration RMS was higher than normal due to Laser brag angle misaligned, the issue was fixed on 02/26/2023 |
| 75010602 | 2022 | 324 | 11:48 | 1 | 6 | PD 10 batteries replaced and replacement of ND filters and measure 1.72V @ 2mm RMS |
| 75010602 | 2022 | 232 | 11:27 | 1 | 6 | Replaced of default PMT cable. |
| 75010602 | 2022 | 232 | 11:27 | 1 | 6 | The default PMT cable was causing larger than nominal RMSs and several mm to cm level instabilities in our system delay. |
| 75010602 | 2022 | 228 | 14:55 | 2 | 6 | Replaced Event Timer Module S/n 1309-B-006 by Event Timer Module S/n 1309-B-009 |
| 75010602 | 2022 | 220 | 11:30 | 0 | 6 | Replaced Amplifier capacitor bank CB632H |
| 75010602 | 2022 | 206 | 10:25 | 0 | 6 | Replace Event Time Module power supply and 1 PPS cable from XLDC to LRC |
| 75010602 | 2022 | 070 | 09:20 | 0 | 99 | Processor computer was replaced |
| 75010602 | 2022 | 060 | 10:00 | 0 | 99 | Display chassis #2 upgraded |
| 75010602 | 2021 | 201 | 09:01 | 0 | 6 | Chiller replacement ( with the new chiller in stock) |
| 75010602 | 2021 | 134 | 14:30 | 0 | 9 | Replaces XL-DC antenna and cable |
| 75010602 | 2021 | 117 | 10:20 | 1 | 9 | Problem that we have experience with the XL-DC that we receive few weeks ago was: 1. Could not find any satellite, 2. It triggers TCG card fly wheeling. Solution: XL-DC Receive card was swap with the old XL-DC receive card. |
| 75010602 | 2021 | 095 | 10:00 | 1 | 9 | Replaces XL-DC with the Old XL -DC and swap PD 10 from the new unit to the old unit |
| 75010602 | 2021 | 091 | 11:00 | 1 | 9 | Replace XL-DC |
| 75010602 | 2021 | 089 | 17:00 | 0 | 6 | Replace two (2) MPCs Encoders |
| 75010602 | 2020 | 332 | 20:30 | 0 | 5 | Replace low loss transmit cable |
| 75010602 | 2020 | 328 | 09:00 | 1 | 5 | CNS clock replaced |
| 75010602 | 2020 | 300 | 00:00 | 1 | 5 | Chiller was repaired and installed back into the system |
| 75010602 | 2020 | 275 | 00:00 | 1 | 5 | Amplifier flash lamp replaced |
| 75010602 | 2020 | 275 | 00:00 | 1 | 5 | PU 430 s/n #H 130 NASA tag no.577429 replaced with PU 430 s/n C 057 # NASA tag G77282 |
| 75010602 | 2020 | 273 | 00:00 | 2 | 6 | PMT supply voltage is now kept the same between calibration and the subsequent measurement session. PMT voltage used is typically 2700 V for day-time tracking, and 3000 V for night-time tracking |
| 75010602 | 2020 | 035 | 00:00 | 0 | 05 | CU401 running on original power supply |
| 75010602 | 2020 | 029 | 00:00 | 0 | 05 | CU401 running on a bench power supply |
| 75010602 | 2020 | 028 | 00:00 | 0 | 05 | CU401 down |
| 75010602 | 2020 | 019 | 00:00 | 1 | 99 | Changed firing rate of all Glonass, Etalon 1 and Etalon 2 to 5PPS |
| 75010602 | 2020 | 016 | 00:00 | 0 | 06 | PD10 photodetector power supply batteries replaced |
| 75010602 | 2019 | 277 | 00:00 | 1 | 06 | PMT high voltage power supply replaced |
| 75010602 | 2019 | 277 | 00:00 | 1 | 06:02:01 | Receive cable replaced with the insulated one |
| 75010602 | 2019 | 269 | 08:30 | 1 | 9 | Relocated the two GPS antennas on the van roof 4.05 meters from original position towards the Radar. |
| 75010602 | 2019 | 265 | 00:00 | 0 | 09 | Additional 1PPS output programmed on XL-DC |
| 75010602 | 2019 | 199 | 00:00 | 1 | 12:01:02 | MET4 unit relocated to the pole |
| 75010602 | 2019 | 150 | 00:00 | 0 | 06 | Iris replaced |
| 75010602 | 2019 | 079 | 00:00 | 0 | 99 | New aircon installed in the laser room |
| 75010602 | 2019 | 045 | 00:00 | 1 | 06:02:03 | Replaced TIU 5370B |
| 75010602 | 2019 | 039 | 00:00 | 0 | 99 | Replaced hot air bypass valve on the chiller |
| 75010602 | 2019 | 036 | 00:00 | 0 | 06 | PD10 photodetector power supply batteries replaced |
| 75010602 | 2019 | 007 | 00:00 | 1 | 05 | 45 degree turning mirror (15d) replaced on the laser table |
| 75010602 | 2018 | 340 | 00:00 | 0 | 99 | Aircon issues |
| 75010602 | 2018 | 333 | 00:00 | 1 | 05 | Laser alignment performed |
| 75010602 | 2018 | 312 | 00:00 | 0 | 06 | OAM down |
| 75010602 | 2018 | 276 | 00:00 | 1 | 06:02:03 | TIU 5370B faulty |
| 75010602 | 2018 | 263 | 00:00 | 0 | 99 | Aircon issues |
| 75010602 | 2018 | 242 | 00:30 | 1 | 05 | Logic card from old PU430 installed on new PU430 |
| 75010602 | 2018 | 242 | 00:00 | 1 | 05 | PU430 replaced |
| 75010602 | 2018 | 218 | 00:00 | 1 | 05 | PU420 down |
| 75010602 | 2018 | 207 | 00:00 | 1 | 05 | Capacitor banks down |
| 75010602 | 2018 | 204 | 00:00 | 0 | 99 | Controller computer replaced with the spare |
| 75010602 | 2018 | 194 | 00:00 | 1 | 05 | Capacitor banks down |
| 75010602 | 2018 | 180 | 00:30 | 0 | 99 | Controller is using 100% disk space |
| 75010602 | 2018 | 180 | 00:15 | 0 | 99 | Processor computer froze during back up |
| 75010602 | 2018 | 180 | 00:00 | 0 | 99 | Controller and processor computers backed up |
| 75010602 | 2018 | 166 | 00:00 | 1 | 06:02:03 | TIU 5370B faulty |
| 75010602 | 2018 | 165 | 00:00 | 0 | 04 | MPACs 5V power supply replaced |
| 75010602 | 2018 | 164 | 00:00 | 0 | 04 | MPACs shut down |
| 75010602 | 2018 | 116 | 00:00 | 0 | 04 | MPACs cable W713 modified by cutting 5V supply to the mount remote station |
| 75010602 | 2018 | 098 | 00:00 | 1 | 06 | PMT high voltage power supply replaced |
| 75010602 | 2018 | 017 | 00:00 | 0 | 05 | Replaced microswitch on the laser amplifier head |
| 75010602 | 2018 | 011 | 00:00 | 0 | 06 | Replaced OAM |
| 75010602 | 2017 | 307 | 00:00 | 1 | 09 | XL-DC receiver replaced |
| 75010602 | 2017 | 232 | 00:00 | 0 | 99 | Chiller pump replaced |
| 75010602 | 2017 | 146 | 00:00 | 1 | 06 | Repaired PMT gating cable |
| 75010602 | 2017 | 142 | 00:00 | 1 | 06 | PMT power supply cable connector replaced |
| 75010602 | 2017 | 142 | 00:00 | 1 | 06:02:01 | Reinstall the old discriminator (SN263) back in the system |
| 75010602 | 2017 | 137 | 00:00 | 1 | 06:02:01 | Discriminator (SN263) replaced with SN306 |
| 75010602 | 2016 | 270 | 00:00 | 0 | 11:01 | Radar installation |
| 75010602 | 2016 | 174 | 00:00 | 1 | 09 | XL-DC replaced |
| 75010602 | 2016 | 074 | 00:00 | 0 | 06 | PD10 photodetector power supply batteries replaced |
| 75010602 | 2015 | 153 | 00:00 | 0 | 4:01 | Replacement of dual Amplifier |
| 75010602 | 2015 | 152 | 00:00 | 0 | 4:01 | System dual Amplifier faulty |
| 75010602 | 2015 | 109 | 00:00 | 0 | 11:01 | Station down due to radar temperature sensor |
| 75010602 | 2015 | 013 | 00:00 | 0 | 11:01 | Replacement of the Radar |
| 75010602 | 2015 | 012 | 00:00 | 0 | 11:01 | Radar was removed for repair |
| 75010602 | 2015 | 012 | 00:00 | 0 | 99 | Replacement of system controller computer |
| 75010602 | 2015 | 007 | 00:00 | 0 | 99 | System Controller computer failed |
| 75010602 | 2015 | 007 | 00:00 | 0 | 99 | System controller computer faulty |
| 75010602 | 2014 | 287 | 00:00 | 2 | 06:02:01 | Replacement of receive cable |
| 75010602 | 2014 | 276 | 00:00 | 0 | 11:01 | Station operational, radar verification was done |
| 75010602 | 2014 | 274 | 00:00 | 0 | 11:01 | Replacement of radar control card, remote card and radar transceiver box |
| 75010602 | 2014 | 251 | 00:00 | 0 | 11:01 | Station down, Radar failed |
| 75010602 | 2014 | 230 | 00:00 | 2 | 06:02:01 | Replacement of HSLR discriminator |
| 75010602 | 2013 | 231 | 00:00 | 0 | 11:01 | Radar verification test done |
| 75010602 | 2013 | 227 | 00:00 | 0 | 11:01 | Replacement of the Radar |
| 75010602 | 2013 | 212 | 00:00 | 0 | 04:01 | System Dual Amplifier replaced |
| 75010602 | 2013 | 185 | 00:00 | 0 | 99 | Replacement of east door worm drive |
| 75010602 | 2013 | 163 | 00:00 | 0 | 04:01 | System Dual Amplifier failed |
| 75010602 | 2013 | 108 | 00:00 | 0 | 12:01:02 | Replacement of Paroscientific (MET 4) |
| 75010602 | 2013 | 061 | 00:00 | 0 | 05 | replaced frequency synthesizer (AML) |
| 75010602 | 2013 | 052 | 00:00 | 0 | 99 | Replacement of the following units: Laser power unit (PU430), Trigger Level, Capacitor bank |
| 75010602 | 2012 | 299 | 00:00 | 0 | 99 | Replacement of True Time GPS (Time & frequency Receiver |
| 75010602 | 2012 | 171 | 00:00 | 0 | 99 | Replacement of high voltage power supply |
| 75010602 | 2012 | 076 | 00:00 | 0 | 99 | Station was operational |
| 75010602 | 2012 | 016 | 00:00 | 0 | 99 | Station down due to laser failure and alignment photo detector was faulty. |
| 75010602 | 2011 | 347 | 00:00 | 0 | 99 | Replacement of air conditioner |
| 75010602 | 2011 | 313 | 00:00 | 0 | 99 | Replacement of standby power supply battery batteries |
| 75010602 | 2011 | 249 | 00:00 | 2 | 06:01:01 | Replacement of receive cable |
| 75010602 | 2011 | 082 | 00:00 | 0 | 10 | replaced laser table and HP5370B TIU |
| 75010602 | 2011 | 010 | 00:00 | 0 | 10 | replaced Symmetricom XL/DC GPS Rb receiver |
| 75010602 | 2010 | 224 | 00:00 | 0 | 06 | replaced Delay Box, Constant Fraction Discriminator |
| 75010602 | 2010 | 223 | 00:00 | 0 | 99 | Replacement of a new Nim-Bin power supply |
| 75010602 | 2010 | 217 | 00:00 | 0 | 11:01 | Radar optical/RF alignment done |
| 75010602 | 2010 | 216 | 00:00 | 0 | 11:01 | Orthoganlity of axes checked using a laser, Radar put on roof |
| 75010602 | 2010 | 216 | 00:00 | 0 | 11:01 | Radar leveled |
| 75010602 | 2010 | 216 | 00:00 | 0 | 11:01 | Replacement electronics Delay Box |
| 75010602 | 2010 | 214 | 00:00 | 0 | 11:01 | Replacement of the azimuth harmonic drive of the radar |
| 75010602 | 2010 | 214 | 00:00 | 0 | 11:01 | Replacement resolvers, radar elevation support, CFD, and drive belts |
| 75010602 | 2010 | 197 | 00:00 | 0 | 99 | Installed new sattrk version 7.1, 16 July, 2010 |
| 75010602 | 2010 | 196 | 00:00 | 0 | 12:01:01 | Replacement of New Paroscientific (MET 3) |
| 75010602 | 2010 | 145 | 00:00 | 0 | 10 | replaced HP5370B TIU |
| 75010602 | 2010 | 069 | 00:00 | 0 | 99 | Installed sattrk version 502 |
| 75010602 | 2009 | 330 | 00:00 | 0 | 05 | new LRO-LR capability |
| 75010602 | 2009 | 273 | 00:00 | 0 | 05 | replaced laser oscillator head |
| 75010602 | 2009 | 247 | 00:00 | 0 | 05 | new h/w and s/w for 10 Hz operations |
| 75010602 | 2009 | 160 | 00:00 | 3 | 99 | installed new processor computer |
| 75010602 | 2009 | 131 | 00:00 | 0 | 06 | replaced Constant Fraction Discriminator |
| 75010602 | 2008 | 310 | 00:00 | 0 | 05 | saturable laser upgrade |
| 75010602 | 2008 | 094 | 00:00 | 3 | 99 | installed new controller computer |
Latest Data
Tracking Statistics
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