| SOD | Year | Day of Year |
Time of Day |
Data Impact | System | Description |
|---|---|---|---|---|---|---|
| 78418701 | 2024 | 065 | 13:00 | 1 | 06.01 | Changes made to signal cable routing on the start and the stop lines. The system delay has changed due to that. |
| 78418701 | 2022 | 277 | 14:00 | 2 | 09 | Former GPS receiver HP-58503A was replaced by Meinberg M1000. |
| 78418701 | 2021 | 363 | 16:00 | 1 | 6 | Changes made to signal cable routing from detectors to event timer for the start diode as well as the primary (SPAD) and secondary (PMT) chain. The system delay has changed due to that on both lines. |
| 78418701 | 2020 | 352 | 12:00 | 2 | 8.01 | Target Distance Update due to filter stack change. The stack is inserted during calibration to adjust the signal rate. The Calibration Target Distance was changed from 6926 to 6952 ps to account for changes of the used glasses. |
| 78418701 | 2020 | 337 | 16:00 | 1 | 5.03 | Start diode signal discriminator/inverter exchanged with upgraded model of same type; trigger threshold reoptimized which changed systrem delay; trigger level set to 40 % of amplitude while pre and post pulses are at 17 % max |
| 78418701 | 2020 | 293 | 11:00 | 2 | 09.01 | GPS receiver antenna delay of 153 ns reimplemented |
| 78418701 | 2020 | 079 | 16:00 | 2 | 09.01 | GPS receiver lost antenna delay of 153 ns |
| 78418701 | 2018 | 227 | 12:00 | 3 | 6.01 | SPAD replaced PMT as primary detector in operation |
| 78418701 | 2017 | 062 | 12:00 | 2 | 06.01 | A033-ET Event Timer replacing A032-ET |
| 78418701 | 2016 | 362 | 16:00 | 0 | 04.01 | New daylight filter with higher peak transmission inserted |
| 78418701 | 2016 | 175 | 12:00 | 1 | 05.02 | Pump diode module for regenerative amplifier exchanged; 10 dB attenuator re-inserted into start channel (change in calibration mean value) |
| 78418701 | 2016 | 145 | 14:00 | 0 | 04.01 | Optical components of telescopes cleaned (negative achromat Tx, entrance window and coupling mirror Rx) |
| 78418701 | 2016 | 083 | 12:00 | 1 | 05.02 | Repaired pump diode for external amplifier and new coupling fibre installed, maximum output power 530 mW |
| 78418701 | 2016 | 056 | 17:00 | 1 | 05.02 | Pump diode for external amplifier and coupling fibre failed, laser operations continued with minimum output power (50 mW) |
| 78418701 | 2016 | 033 | 10:00 | 1 | 05.02 | Repaired HV power supply for Pockels cell inserted, operations resumed |
| 78418701 | 2016 | 018 | 06:00 | 1 | 05.02 | HV power supply for Pockels cell failed, tracking suspended |
| 78418701 | 2015 | 296 | 10:00 | 0 | 04.01 | Interpolator unit in Rx azimuth axis replaced, tracking resumed |
| 78418701 | 2015 | 291 | 20:00 | 0 | 04.01 | Interpolator unit in Rx azimuth axis faulty, tracking suspended |
| 78418701 | 2015 | 204 | 10:00 | 1 | 05.02 | Drop in start photodiode amplitude, 10 dB attenuater removed from start channel (change in target mean value) |
| 78418701 | 2014 | 246 | 08:00 | 0 | 05.02 | Controller and coupling fibre exchanged, operations resumed with nominal output power |
| 78418701 | 2014 | 218 | 09:00 | 0 | 05.02 | Controller of oscillator stage failed, station operations interrupted |
| 78418701 | 2014 | 125 | 14:00 | 2 | 05.02 | Coupling fibre for final amplifier stage broken, output reduced to 40 mW average power |
| 78418701 | 2013 | 264 | 16:00 | 0 | 04.01 | Azimuth encoder of Tx telescope exchanged |
| 78418701 | 2013 | 145 | 12:00 | 1 | 04.01 | Narrowband daylight filter and wideband (3 nm) nighttime filter selectable for signal optimization |
| 78418701 | 2012 | 341 | 16:00 | 0 | 05.02 | Mating and de-mating of laser control cables to restore proper TEC operation |
| 78418701 | 2012 | 270 | 16:00 | 2 | 06.01 | Faulty PMT H5320 replaced by spare unit of same type |
| 78418701 | 2012 | 089 | 12:00 | 2 | 05.02 | Experimental start pulse converter removed |
| 78418701 | 2012 | 088 | 12:00 | 2 | 05.02 | Start pulse converter with constant fraction properties inserted for test |
| 78418701 | 2012 | 039 | 09:00 | 2 | 06.01 | PMT operational voltage raised from 1600 to 1700 V |
| 78418701 | 2012 | 011 | 12:00 | 0 | 05.02 | Coupling mirror inside the laser replaced by 25-mm HR type |
| 78418701 | 2011 | 314 | 12:00 | 2 | 05.02 | Too high sensitivity of start pulse converter detected, 10 dB attenuator inserted |
| 78418701 | 2011 | 242 | 12:00 | 3 | 06.02 | MPD-1CTC SPAD replacing AD230 SPAD |
| 78418701 | 2011 | 242 | 12:00 | 3 | 05.02 | kHz Nd:YVO laser replacing 10 Hz Nd:YAG system |
| 78418701 | 2011 | 242 | 12:00 | 2 | 06.01 | A032-ET Event Timer replacing A031-ET |
| 78418701 | 2008 | 300 | 00:00 | 1 | 04.01 | Daylight filter replaced by same type and FWHM |
| 78418701 | 2004 | 050 | 00:00 | 2 | 06.01 | A031 Event timer replacing SR620 time interval counter |
| 78418701 | 2003 | 150 | 00:00 | 1 | 04.01 | Daylight filter (0.4 nm FWHM) introduced |
Latest Data
Tracking Statistics
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