| SOD | Year | Day of Year |
Time of Day |
Data Impact | System | Description |
|---|---|---|---|---|---|---|
| 18844481 | 2024 | 326 | 13:00 | 1 | 5.02 | Nonlinear optical element temporary removed |
| 18844401 | 2024 | 216 | 18:00 | 1 | 6.01.04 | PMT to amplifier coaxial cable replaced, starting day 221 system delay increased ~245 mm |
| 18844401 | 2024 | 204 | 15:00 | 1 | 5.02 | Laser oscillator flash lamp voltage adjustment |
| 18844401 | 2024 | 200 | 13:00 | 1 | 5.02 | Laser: Coude path alignment adjustment |
| 18844401 | 2024 | 187 | 14:00 | 1 | 5.02 | Nonlinear optical element mode set to Az, angle=333 |
| 18844401 | 2024 | 120 | 11:30 | 1 | 5.02 | Nonlinear optical element installed back, mode set to R, angle=243 |
| 18844401 | 2024 | 115 | 15:00 | 1 | 6.04 | Receiver channel maintenance, amp2time compensation function update |
| 18844401 | 2024 | 095 | 10:00 | 1 | 5.02 | Nonlinear optical element temporary removed |
| 18844401 | 2024 | 040 | 13:00 | 1 | 5.02 | Nonlinear optical element installed back, mode set to R |
| 18844401 | 2024 | 029 | 12:00 | 1 | 5.02 | Nonlinear optical element temporary removed |
| 18844401 | 2024 | 003 | 14:00 | 1 | 5.02 | Nonlinear optical element mode set to R |
| 18844401 | 2023 | 306 | 14:00 | 1 | 9.02 | Primary time and frequency standard: SecureSync 1200-033 (05280) software upgrade from 5.96 to 5.98 |
| 18844401 | 2023 | 306 | 10:30 | 1 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) SW update from 5.9.7 to 5.9.8 |
| 18844401 | 2023 | 291 | 13:00 | 1 | 4.02 | Telescope: optical channel commutation system firmware updated |
| 18844401 | 2023 | 277 | 15:00 | 1 | 8.03 | System delay value updated |
| 18844401 | 2023 | 272 | 12:00 | 1 | 5.02 | Nonlinear optical element mode set to Az |
| 18844401 | 2023 | 262 | 12:00 | 1 | 5.02 | Nonlinear optical element installed to change laser beam spatial profile (mode:R) |
| 18844401 | 2023 | 205 | 15:30 | 1 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) SW update from 5.9.1 to 5.9.6 |
| 18844401 | 2023 | 205 | 15:00 | 1 | 9.02 | Primary time and frequency standard: SecureSync 1200-033 (05280) software upgrade from 5.95 to 5.96 |
| 18844401 | 2023 | 156 | 14:00 | 1 | 5.02 | Laser: oscillator and amplifier flashlamps changed |
| 18844401 | 2023 | 104 | 12:00 | 1 | 6.04 | Receiver channel: alignment check, maintenance |
| 18844401 | 2023 | 104 | 12:00 | 1 | 5.02 | Laser: Coude path alignment check |
| 18844401 | 2023 | 095 | 12:30 | 1 | 9.02 | Primary time and frequency standard: changed CF card, software upgrade to 5.95, optical 1PPS line to the telescope installed |
| 18844401 | 2022 | 237 | 13:00 | 1 | 9.02 | 10MHz and 1PPS distribution amplifier change at telescope from Pendelum DA36 to FDA-301 |
| 18844401 | 2022 | 229 | 12:00 | 1 | 5.02 | EKSPLA laser service, recalibration of internal energy meter, maintenance |
| 18844401 | 2022 | 059 | 13:30 | 0 | 9.02 | Primary time and frequency standard: GLONASS removed from the secondary timing signal sources |
| 18844401 | 2021 | 350 | 14:00 | 0 | 4.02 | Telescope: new optical channel commutation system and controller installed |
| 18844401 | 2021 | 258 | 12:00 | 0 | 4.02 | Telescope: Az/El new motors, drive mechanics and control electronics installed |
| 18844401 | 2020 | 305 | 13:00 | 0 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) SW update 5.8.8 to 5.8.9 |
| 18844401 | 2020 | 304 | 14:00 | 0 | 99 | Auxiliary time and frequency standard SecureSync 1200-011 (05853) SW updated from 5.8.8 to 5.8.9 |
| 18844401 | 2020 | 241 | 12:00 | 0 | 4.02 | Elevation drive: gear replacement and readjustment, motor cleanup and service |
| 18844401 | 2020 | 168 | 15:00 | 0 | 4.02 | Elevation drive: gear replacement and readjustment |
| 18844401 | 2020 | 157 | 13:30 | 0 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) SW update 5.8.5 to 5.8.8 |
| 18844401 | 2020 | 157 | 13:30 | 0 | 99 | Auxiliary time and frequency standard SecureSync 1200-011 (05853) SW update to from 5.8.4 to 5.8.8 |
| 18844401 | 2020 | 155 | 14:00 | 0 | 4.02 | Azimuth drive: gear replacement and readjustment |
| 18844401 | 2020 | 083 | 14:00 | 1 | 5.02 | Laser: oscillator FCB adjustment |
| 18844401 | 2019 | 283 | 14:00 | 1 | 6.04 | Receiver chain: TS/ATIC signal processing unit #1 replaced with #2 |
| 18844401 | 2019 | 255 | 15:00 | 1 | 9.02 | Timing system: 1pps signal from main time and frequency source to telescope building switched to other cable |
| 18844401 | 2019 | 255 | 15:00 | 1 | 5.02 | Laser: water changed in cooling system |
| 18844401 | 2019 | 234 | 14:00 | 1 | 6.04 | Receiver channel: steel cable channel installed |
| 18844401 | 2019 | 231 | 13:30 | 1 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) SW update 5.8.4 to 5.8.5 |
| 18844401 | 2019 | 227 | 11:00 | 1 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) SW update 5.8.0 to 5.8.4, CF card replaced |
| 18844401 | 2019 | 226 | 15:00 | 0 | 99 | Auxiliary time and frequency standard SecureSync 1200-011 (05853) SW update to 5.8.4, CF card replaced |
| 18844401 | 2019 | 171 | 14:00 | 0 | 4.02 | Elevation drive: grease change, drive checkup |
| 18844401 | 2019 | 158 | 12:00 | 0 | 4.02 | Azimuth drive: grease change, drive checkup |
| 18844401 | 2019 | 081 | 14:00 | 1 | 6.02 | Receiver channel: Event timer control computer change, new PC win10 64 bit OS |
| 18844401 | 2018 | 262 | 15:00 | 1 | 5.02 | Laser: oscillator and amplifier flashlamps changed, EOS feedback adjusted |
| 18844401 | 2018 | 149 | 13:00 | 0 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) software update to from 5.7.1 to 5.8.0 |
| 18844401 | 2018 | 130 | 09:00 | 1 | 6.03 | CFD installed in a new powered NIM crate |
| 18844401 | 2017 | 335 | 15:00 | 0 | 05.02 | Telescope drive cables replaced. |
| 18844401 | 2017 | 255 | 14:00 | 0 | 9.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05281) software update to version from 5.7.0 to 5.7.1 |
| 18844401 | 2017 | 247 | 15:00 | 1 | 04.02 | Telescope optical channel commutation unit repaired. Rotating mirror gear position fixed. |
| 18844401 | 2017 | 208 | 14:00 | 1 | 09.02 | Time and frequency: time and frequency unit swap: 1200-033 (05280) now primary |
| 18844401 | 2017 | 207 | 12:00 | 1 | 99 | Auxiliary time and frequency standard SecureSync 1200-011 (05853) software update from version 5.6.0 to 5.7.0 |
| 18844401 | 2017 | 181 | 09:00 | 1 | 09.02 | Time and frequency: primary time and frequency standard SecureSync 1200-033 (05281) software update to version from 5.6.0 to 5.7.0 |
| 18844401 | 2017 | 166 | 14:30 | 1 | 09.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05280) software update to 5.7.0 |
| 18844401 | 2017 | 118 | 15:00 | 1 | 99 | Auxiliary time and frequency standard SecureSync 1200-011 (05853) software update from version 5.60 |
| 18844401 | 2017 | 098 | 11:00 | 1 | 09.02 | Time and frequency: primary time and frequency standard SecureSync 1200-033 (05281) software update to version 5.60 |
| 18844401 | 2017 | 095 | 13:30 | 1 | 09.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05280) software update to 5.6.0 |
| 18844401 | 2017 | 086 | 09:00 | 1 | 99 | Laser room: temperature control system repaired |
| 18844401 | 2017 | 046 | 13:00 | 1 | 05.02 | Telescope: new rotating mirror sync. control unit operational |
| 18844401 | 2017 | 040 | 15:00 | 1 | 05.02 | Telescope: installed new rotating mirror sync. control unit, old still primary |
| 18844401 | 2016 | 292 | 15:00 | 1 | 06.02 | Receiver channel: tests done with PMT preamplifier, original setup restored |
| 18844401 | 2016 | 274 | 11:00 | 1 | 05.02 | Laser: oscillator and amplifier flashlamps changed |
| 18844401 | 2016 | 271 | 17:00 | 1 | 08.02 | Calibration: internal calibration signal amplitude increased from 950 to 1500 |
| 18844401 | 2016 | 271 | 17:00 | 1 | 06.02 | Receiver channel: amplitude correction function adjusted |
| 18844401 | 2016 | 260 | 13:00 | 1 | 99 | Auxiliary time and frequency standard SecureSync 1200-011 (05853) software update from version 5.41 to 5.45 |
| 18844401 | 2016 | 259 | 13:00 | 1 | 05.02 | Laser: water changed in cooling system |
| 18844401 | 2016 | 259 | 13:00 | 1 | 09.02 | Time and frequency: primary time and frequency standard SecureSync 1200-033 (05281) software update from version 5.41 to 5.45 |
| 18844401 | 2016 | 258 | 13:00 | 0 | 09.02 | Time and frequency: secondary time and frequency standard SecureSync 1200-033 (05280) software update from version 5.41 to 5.45 |
| 18844401 | 2016 | 249 | 15:00 | 1 | 06.02 | Receiver channel: receiver channel adjustment |
| 18844401 | 2016 | 094 | 15:00 | 1 | 05.02 | Laser: EOS feedback adjustmnent |
| 18844401 | 2016 | 089 | 15:00 | 2 | 06.02 | Receiver channel: CFD power supply changed |
| 18844401 | 2016 | 078 | 13:00 | 1 | 09.02 | Time and frequency: time and frequency standard SecureSync 1200-033 software update from version 5.31 to 5.41 |
| 18844401 | 2016 | 076 | 13:00 | 1 | 99 | Auxiliary time and frequency standard SecureSync 1200-011 software update from version 5.31 to 5.41 |
| 18844401 | 2015 | 334 | 15:00 | 1 | 05.02 | Telescope: Azimuth and elevation encoders installed |
| 18844401 | 2015 | 331 | 15:00 | 1 | 05.02 | Laser: EOS feedback adjustment |
| 18844401 | 2015 | 291 | 15:00 | 1 | 04.02 | Telescope main mirror replaced, optical system alignment |
| 18844401 | 2015 | 287 | 15:00 | 0 | 99 | Telescope building: telescope movement monitoring webcam installed |
| 18844401 | 2015 | 184 | 15:00 | 2 | 06.02 | Receiver channel: PMT focussing adjusted |
| 18844401 | 2015 | 182 | 15:00 | 1 | 05.02 | Laser: Laser master oscillator adjusted, lamp replaced |
| 18844401 | 2015 | 155 | 15:00 | 1 | 04.02 | Telescope: secondary mirror replaced, optical system alignment |
| 18844401 | 2015 | 073 | 15:00 | 0 | 99 | Telescope building: all-sky camera installed |
| 18844401 | 2014 | 140 | 15:00 | 1 | 08.02 | Calibration: laser beam calibration path entry post changed, realignment of fiber entry |
| 18844401 | 2014 | 134 | 15:00 | 2 | 99 | Telescope building: power line and grounding repair |
| 18844401 | 2014 | 119 | 15:00 | 2 | 08.02 | Calibration: realignment of calibration fiber entry and exit connectors |
| 18844401 | 2014 | 119 | 13:00 | 1 | 99 | Telescope control: auxialiary SecureSync 1200-011 OXCO time and frequency base installed |
| 18844401 | 2014 | 119 | 12:00 | 1 | 08.02 | Telescope control: device layout and cabling changed, control electronics now receives 5MHz and 1Mhz from SecureSync 1200-011 |
| 18844401 | 2014 | 117 | 13:00 | 2 | 05.02 | Laser: flash lamps changed in SL312 oscillator and generator |
| 18844401 | 2014 | 093 | 13:00 | 2 | 08.02 | Calibration: Attenuation filters in calibration path before fiber entry changed to ND64 + 2 rotating polarizers |
| 18844401 | 2014 | 056 | 11:39 | 3 | 09.01 | Timing: SecureSync 1200-033 Rb GPSDO time and frequency base installed |
| 18844401 | 2014 | 015 | 16:00 | 1 | 99 | Laser room: new heating system in laser compartment room with temperature control |
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