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Station History Log - Riga, Latvia (1884)

SOD Year Day
of Year
Time
of Day
Data Impact System Description
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 06.02 Receiver channel: amplitude correction function adjusted
18844401 2016 271 17:00 1 08.02 Calibration: internal calibration signal amplitude increased from 950 to 1500
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 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 259 13:00 1 05.02 Laser: water changed in cooling system
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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