| SOD | Year | Day of Year |
Time of Day |
Data Impact | System | Description |
|---|---|---|---|---|---|---|
| 71100412 | 2024 | 277 | 22:00 | 3 | 9 | Reinstalled original Event Timer Module ETM-02 from day 276 removed ETM A033-ET. |
| 71100412 | 2024 | 276 | 04:00 | 3 | 9 | Swapped out Event Timer Module ETM-02 with A033-ET for troubleshooting purposes. |
| 71100412 | 2024 | 248 | 01:45 | 1 | 6 | Replaced receive cable |
| 71100412 | 2024 | 166 | 15:00 | 2 | 9.02.01 | Remove XLDC replaced with FS740 GPS Time Frequency System |
| 71100412 | 2023 | 313 | 04:05 | 2 | 6 | Removed 6db attenuator from ARSU receive side for more return signal strength. |
| 71100412 | 2023 | 181 | 22:00 | 2 | 5 | High voltage cable was shorting out to the cap bank, cable replaced. |
| 71100412 | 2023 | 087 | 20:00 | 2 | 6 | Changed out the Amplified Receive Selection Unit (ARSU) with a newly modified unit with over voltage protection. |
| 71100412 | 2023 | 087 | 19:00 | 3 | 9 | Replaced Event Timer Module A033-ET with ETM model ETM-02 due to an upgrade to be done on A033-ET |
| 71100412 | 2021 | 214 | 23:52 | 0 | 6 | Installed EC 3273A Combiner panel for Transmit and Receive signals to the Event Timer. |
| 71100412 | 2021 | 169 | 21:26 | 0 | 9 | Replaced Event Timer Module, In Sense 09103, Out SCNS 001108 due to failure. |
| 71100412 | 2021 | 102 | 22:00 | 0 | 5 | Track Lageos satellites at 10pps at the range 42ms or less. 5pps used for ranges greater then 42ms. |
| 71100412 | 2021 | 091 | 06:00 | 2 | 5 | Laser photo diode off, change in calibration system delay from 091/1300 to 091/1900. |
| 71100412 | 2021 | 039 | 22:00 | 0 | 5 | Aligned the Laser Oscillator alignment. |
| 71100412 | 2020 | 197 | 03:36 | 0 | 6 | Replaced HSLR Discriminator due to the original had two bad outputs, In G78715 SN 310, Out G77076 SN 460. |
| 71100412 | 2020 | 191 | 06:00 | 1 | 6 | Replaced the receive cable. |
| 71100412 | 2020 | 176 | 02:00 | 0 | 6 | Changed output of ARSU receive discriminator due to a blown output. |
| 71100412 | 2020 | 156 | 06:00 | 2 | 5 | Laser photo diode off, change in calibration system delay from 156/1300 to 156/2100. |
| 71100412 | 2020 | 095 | 01:53 | 2 | 99 | A 4.9 earthquake occurred at 95/01:53Z , at Anza Ca. (33.489N 116.506W) which is approximately 47 miles from the station at a depth of 10.4 km. The quakes continued every minute (5) , 10 minutes (3), 30 minutes (1) with the largest aftershock measuring 3.7. |
| 71100412 | 2020 | 017 | 23:00 | 0 | 6 | Changed fire rate from 4pps to 5pps for etalon and Glonass satellites |
| 71100412 | 2020 | 008 | 00:14 | 0 | 12.01.02 | Met 4 replaced with newly calibrated unit SN 146634 |
| 71100412 | 2019 | 088 | 00:23 | 3 | 9 | Event Timer Module, Event Computer replaced TIU. |
| 71100412 | 2018 | 093 | 22:30 | 1 | 9 | Replaced TIU M04198 with G78409, Blower fan replaced. |
| 71100412 | 2018 | 087 | 13:00 | 1 | 9 | Replaced TIU G78409, Lock Loop Error, with M04198 |
| 71100412 | 2017 | 060 | 23:11 | 0 | 99 | Set Transmit Dely (TDEL) from a 2 to a 1 inside the LRC drawer. |
| 71100412 | 2017 | 004 | 22:00 | 2 | 9.02.01 | Replaced the XLDC GPS Time frequency receiver. Original recycled power ramdomly. |
| 71100412 | 2016 | 335 | 22:00 | 2 | 6.01.01 | MCP replaced, original had large noise spikes, ringing. |
| 71100412 | 2016 | 301 | 22:00 | 2 | 9.02.01 | Replaced the XLDC GPS Time frequency receiver. Original readings drifting. |
| 71100412 | 2016 | 162 | 08:04 | 2 | 99 | M5.2 Earthquake 20km NNW of Borrego Springs, CA; centered 33.431 degrees N 116.443 degrees W |
| 71100412 | 2016 | 013 | 22:00 | 0 | 9 | Removed Time Code Generator EC 1073 completed. |
| 71100412 | 2015 | 189 | 22:00 | 2 | 9 | Replaced TIU, In G78409 Out G78762, original was drifting in range values. Incremented confg flags processor 8 Controller 1 |
| 71100412 | 2015 | 188 | 22:00 | 0 | 9 | Installed timing counter 53131, old 5334 counter failed. |
| 71100412 | 2015 | 177 | 22:00 | 2 | 9 | Adjusted TIU trigger levels to get normal ranges. |
| 71100412 | 2015 | 176 | 22:00 | 2 | 9 | Adjusted TIU trigger levels to get normal ranges. |
| 71100412 | 2015 | 174 | 22:00 | 2 | 9.02.01 | Replace XLDC original unit had power on problems, incremented config flags Processor 7 Controller 9. |
| 71100412 | 2015 | 160 | 22:00 | 0 | 9 | EC 291 remove Distribution Amp, all timing signals direct from XLDC. |
| 71100412 | 2015 | 138 | 22:00 | 2 | 9 | Adjusted TIU trigger levels to get normal range values. |
| 71100412 | 2015 | 020 | 00:00 | 0 | 6 | Replace Integrator to get normal transmit and receive power readings |
| 71100412 | 2015 | 016 | 00:00 | 2 | 5 | Adjusted acoustic mode locker bragg angle. |
| 71100412 | 2014 | 286 | 00:00 | 0 | 5 | Replaced acoustic mode locker frequency synthesizer |
| 71100412 | 2014 | 234 | 00:10 | 0 | 5 | Replaced second harmonic generator |
| 71100412 | 2014 | 234 | 00:00 | 2 | 5 | Replaced acoustic mode locker frequency synthesizer |
| 71100412 | 2014 | 098 | 00:00 | 1 | 6 | Changed receive cable |
| 71100412 | 2014 | 063 | 00:00 | 2 | 5 | Adjusted pockel cell aligment |
| 71100412 | 2014 | 024 | 23:52 | 0 | 9.02.01 | Installed SCNS000271, incremented flags on 1/31/14. XL-DC GP |
| 71100412 | 2014 | 024 | 21:20 | 0 | 9.02.01 | Removed XL-DC (SCNS 0150) with SCNS00271 |
| 71100412 | 2013 | 280 | 21:58 | 0 | 9.02.01 | Installed spare XL-DC SCNS0150; Incremented config flags to a 6. |
| 71100412 | 2013 | 280 | 21:20 | 1 | 9 | Removed G77401 - having fluctuations) XL-DC GPS |
| 71100412 | 2013 | 276 | 23:52 | 1 | 9 | Installed G78762. 5370B Counter |
| 71100412 | 2013 | 276 | 21:00 | 1 | 9 | Removed M04198. 5370B Counter |
| 71100412 | 2013 | 273 | 23:52 | 0 | 9 | Installed M04198; incremented config flags from4 to 5. 5370B Counter |
| 71100412 | 2013 | 194 | 00:30 | 1 | 9 | Installed TCG G77086 (removed G78519); new STA-RB = 4.046 microsecs; incremented processor & controller config flags 3 to 4. |
| 71100412 | 2013 | 173 | 02:09 | 1 | 5 | 9 Replaced TCG (G77086) with G78519, updated config flags, reset station time: STA-RB = 4.035 microsecs. |
| 71100412 | 2013 | 142 | 01:16 | 0 | 5 | Installed M04211 PU-430. |
| 71100412 | 2013 | 126 | 21:58 | 0 | 9.02.01 | Replaced site XL-DC (SCNS150) with spare G77401; STA-RB = 4.045 microsecs; updated processor & controller config flags. |
| 71100412 | 2013 | 084 | 19:49 | 0 | 9.02.01 | Installed spare XL-DC below M4 unit; switch M4 unit FM A mode to REG mode. |
| 71100412 | 2013 | 070 | 16:56 | 2 | 99 | M4.7 Earthquake 20km ESE of Anza, CA; centered 33.502 degrees N 116.457 degrees W |
| 71100412 | 2013 | 065 | 23:52 | 0 | 6 | Replaced NIMBIN power Supply; changed discriminator settings. |
| 71100412 | 2012 | 355 | 00:00 | 1 | 6.01.01 | Installed cable on MCP, all working, HV pw supply no longer tripping. |
| 71100412 | 2012 | 354 | 00:00 | 1 | 6.01.01 | Installed MCP power supply still trips, probably HV cable. |
| 71100412 | 2012 | 352 | 00:00 | 1 | 6.01.01 | HV supply for MCP appears down, trips when load connected. |
| 71100412 | 2012 | 338 | 00:00 | 0 | 12.01.02 | Installed New MET 4 weather station. |
| 71100412 | 2012 | 223 | 00:00 | 1 | 9 | Installed original TIU G78762 5370B Counter and spare APC; updated processor config flag from 6 to 7. |
| 71100412 | 2012 | 215 | 10:10 | 1 | 99 | Site requested to swap TIU (G78409 0.43/-.08/G78023 -.30/-.30) 5370B Counter. |
| 71100412 | 2012 | 174 | 00:00 | 1 | 9 | 2nd Spare TIU G78023 5370B Counter. |
| 71100412 | 2012 | 170 | 16:42 | 1 | 9 | Entered cable delay into Rb; STA-RB - 4.053 microsecs. |
| 71100412 | 2012 | 167 | 00:00 | 0 | 9.02.01 | Installed SCNS 150 XL-DC rubidium at end of shift; entered delay 121 nanosecs, lat & long okay. |
| 71100412 | 2012 | 091 | 05:16 | 0 | 9 | Connected Rubidium 10MHz directly to TIU. |
| 71100412 | 2012 | 080 | 00:00 | 1 | 9 | Re-installed TIU (G78770), then switched back to G78762 5370B Counter; |
| 71100412 | 2012 | 072 | 00:00 | 0 | 9.02.01 | Installed replacement rubidium/removed it and reinstalled original; new STA-RB = 4.004 microsecs. |
| 71100412 | 2012 | 053 | 00:00 | 1 | 9 | Installed Engineering TIU, optimized, better then original |
| 71100412 | 2011 | 238 | 00:00 | 1 | 9 | Removed G78023, installed G78409 5370B Counter; TIU Optimization: |
| 71100412 | 2011 | 206 | 00:00 | 1 | 9 | Removed TIU G78409; replaced with G78023 5370B Counter; |
| 71100412 | 2011 | 180 | 00:00 | 1 | 6 | Replaced PMT. |
| 71100412 | 2011 | 089 | 00:00 | 0 | 12.01.02 | Completed MET4 EC Installation |
| 71100412 | 2010 | 300 | 00:00 | 1 | 9 | Returned M4 TIU. |
| 71100412 | 2010 | 291 | 00:00 | 1 | 9 | Install M6 TIU. |
| 71100412 | 2010 | 271 | 00:00 | 2 | 6 | Replaced receive cable. |
| 71100412 | 2010 | 215 | 00:00 | 2 | 6 | Receive cable looks likes it has been damaged (unsure of date - one log book has 8/3 another had 8/5). |
| 71100412 | 2010 | 210 | 00:00 | 1 | 6.01.01 | Installed MCP (from M7); changed config flag on controller form a 10 to a zero (unsure of date - one log book has 7/20 another has 7/29) |
| 71100412 | 2010 | 202 | 00:00 | 1 | 6 | Installed G77403, removed G77077. (HIGH VOLTAGE POWER SUPPLY STANFORD) |
| 71100412 | 2010 | 180 | 00:00 | 1 | 6.01.01 | MCP installation, changed processor flag from 0 to 1; change controller flag from 2 to 3 |
| 71100412 | 2010 | 180 | 00:00 | 1 | 9 | Installed G78409. 5370B Counter. |
| 71100412 | 2010 | 179 | 00:00 | 1 | 9 | Installed G78762. 5370B Counter. |
| 71100412 | 2010 | 166 | 04:26 | 2 | 99 | M5.8 Earthquake, Lat 32.7N Lon 115.921W |
| 71100412 | 2010 | 137 | 00:00 | 1 | 9 | Installed TIU G78409, optimized -.31 & -.28; removed G77075. G78409 showed a drift of 99.77 nanosecs to 99.84 nanosecs on bench test. |
| 71100412 | 2010 | 094 | 22:40 | 2 | 99 | M7.2 Baja Earthquake and multiple M5.4 earthquakes |
| 71100412 | 2010 | 077 | 00:00 | 1 | 6 | Installed/tested new PMT .1 better RMS; ran disc/stability on new PMT at -3200 volts |
| 71100412 | 2009 | 265 | 00:00 | 0 | 99 | Installed LRC 10PPS board. |
| 71100412 | 2009 | 120 | 00:00 | 0 | 12.03.01 | Replaced MET-3 with G78440 (out G78636). |
| 71100412 | 2009 | 108 | 00:00 | 1 | 6 | Installed G77365 discriminator; removed G77110. |
| 71100412 | 2009 | 047 | 00:00 | 0 | 12.03.01 | Replaced Met-3 with G78636 (out G78606) |
| 71100412 | 2009 | 035 | 00:00 | 0 | 12.03.01 | Replaced Met-3 with G78606 (out G78636) |
| 71100412 | 2008 | 242 | 00:00 | 0 | 5.01 | Laser Upgrade Installation in progress since 8/15/08. |
| 71100412 | 2008 | 238 | 00:00 | 1 | 9 | Replaced TIU with spare (original not working - 04 error could not clear). |
| 71100412 | 2008 | 163 | 00:00 | 0 | 12.03.01 | New MET3 Installed. |
| 71100412 | 2006 | 320 | 19:43 | 2 | 6 | Replaced receive cable. |
| 71100412 | 2006 | 142 | 20:16 | 0 | 9.01.01 | Installed new RB standard G78422; time reset STA-RB = 3.992/3 microsecs; STA-CNS = -4.0213 at 2026Z. |
| 71100412 | 2006 | 096 | 00:00 | 1 | 5.01 | Installed new PMT. |
| 71100412 | 2005 | 145 | 21:30 | 0 | 9 | Installed new RB freq Standard; STA-RB - 4.009 microsecs. |
| 71100412 | 2004 | 348 | 00:00 | 2 | 6 | Swapped out receive cable. |
| 71100412 | 2004 | 273 | 00:00 | 2 | 6 | Swapped out receive cable. |
| 71100412 | 2003 | 163 | 00:00 | 0 | 6 | EC 006-05-2000 HV Power Supply Installed |
| 71100412 | 2003 | 147 | 20:12 | 0 | 99 | Site SOD change from 71100411 to 71100412 |
| 71100411 | 2002 | 346 | 20:39 | 0 | 5.01 | Completed EC005-11-2002 installation. |
| 71100411 | 2002 | 342 | 00:00 | 0 | 5.01 | Installed CFD (xmit/rcv) that came with the new Photek tube. |
| 71100411 | 2002 | 339 | 00:00 | 0 | 12.02.01 | Installed new MET3 sensor. |
| 71100411 | 2002 | 339 | 00:00 | 0 | 5.01 | Installed new Photek PMT. |
| 71100411 | 2002 | 273 | 00:00 | 0 | 99 | Installed engineering supplied LRC. |
| 71100411 | 2002 | 156 | 00:00 | 2 | 9 | Swapped out TIU with engineering supplied unit. |
| 71100411 | 2002 | 155 | 00:00 | 2 | 6 | Replaced receive cable. |
| 71100411 | 2001 | 232 | 05:40 | 2 | 99 | Replaced receive cable. |
| 71100411 | 2001 | 232 | 00:11 | 2 | 6.01.01 | Installed new MCP tube. |
| 71100411 | 2001 | 230 | 00:00 | 2 | 6.01.01 | MCP replaced. |
| 71100411 | 2001 | 215 | 00:49 | 0 | 9 | Turned on new RB. |
| 71100411 | 2001 | 135 | 00:00 | 1 | 6 | Changed PMT drive gate cable. |
| 71100411 | 2001 | 113 | 00:00 | 2 | 6.01.01 | Changed MCP. |
| 71100411 | 2001 | 078 | 00:00 | 2 | 6.01.01 | Changed MCP. |
| 71100411 | 2001 | 053 | 00:00 | 1 | 6.01 | Swapped out PMT. |
| 71100411 | 2001 | 052 | 00:00 | 1 | 6.01 | Swapped out PMT. |
| 71100411 | 2001 | 032 | 23:00 | 0 | 12.02.01 | Changed out MET3 sensor. |
| 71100411 | 2000 | 357 | 00:00 | 1 | 5.01 | Replaced 702 module with engineering supplied unit, voltages +420 - 940 vice +120 to 270. Appears to be working correctly. |
| 71100411 | 2000 | 111 | 00:00 | 0 | 12.03.01 | Completed MET3 hardware/software installation (EC-003-9-1999). |
| 71100411 | 2000 | 109 | 00:00 | 0 | 9 | Installed the 20 PPS 50% duty cycle modification to the TCG. |
| 71100411 | 2000 | 081 | 20:40 | 0 | 9 | RB Installed and turned on. |
| 71100411 | 2000 | 036 | 23:30 | 2 | 9 | Replaced 5334B counter with one from engineering. Trig levels set to +1.2V vice +1.1 & +1.2V. |
| 71100411 | 1999 | 351 | 00:00 | 0 | 7 | LRC problem repaired. Replaced IDH10 IC (74ACT157). |
| 71100411 | 1999 | 235 | 00:00 | 0 | 99 | Reference to EC-6196-628. Need more detail |
| 71100411 | 1999 | 181 | 20:00 | 0 | 9 | EC 002-5-1999 CS replacement completed. STA-RB = 3.99 microsecs, |
| 71100411 | 1999 | 167 | 00:00 | 2 | 6 | Changed out receive cable. |
| 71100411 | 1999 | 137 | 00:00 | 0 | 99 | EC-6250-616 installed, many problems. Need more detail |
| 71100411 | 1999 | 126 | 00:00 | 0 | 9 | EC 6258-616 installation CNS Clock; |
| 71100411 | 1999 | 112 | 00:00 | 0 | 12.01.01 | Barometer issues. |
| 71100411 | 1999 | 106 | 00:00 | 0 | 9.02.01 | Began GPS EC installation. |
| 71100411 | 1999 | 047 | 00:00 | 1 | 99 | Replaced TIU - returned data to normal. |
| 71100411 | 1998 | 326 | 21:16 | 0 | 99 | Lost power, resyncd STA-CS = 49.87 microsecs; Reconnected battery |
| 71100411 | 1998 | 317 | 00:00 | 0 | 5 | Lost laser trigger, found J512 had a short between red/black wire. |
| 71100411 | 1998 | 075 | 00:00 | 0 | 5.01 | Installed EC-6196-628, some wiring problems. Need Detail |
| 71100411 | 1998 | 036 | 00:00 | 0 | 11 | Installed Radar Mod for newly processed microprocessor; EC-xxxx. |
| 71100411 | 1997 | 267 | 15:00 | 0 | 11 | Installed new clinometer in radar. |
| 71100411 | 1997 | 196 | 00:00 | 0 | 9 | CS 442 removed; installed CS 2220. SV21 = -60.640 nanosecs; SV23 = -60.573 nanosecs; STA-CS = 60.620 microsecs. |
| 71100411 | 1997 | 114 | 00:00 | 0 | 99 | Installed optical drive in HP (still experiencing whining sound). |
| 71100411 | 1997 | 028 | 08:00 | 1 | 6 | Re-installed low loss receive cable. |
| 71100411 | 1997 | 028 | 00:00 | 1 | 6 | Removed new PMT cable. |
| 71100411 | 1997 | 024 | 00:00 | 1 | 6 | Installed new PMT cable. |
| 71100411 | 1996 | 321 | 22:04 | 0 | 6 | OAM problem. |
| 71100411 | 1996 | 163 | 00:00 | 0 | 99 | Installed new HP 680C optical side a drive. |
| 71100411 | 1996 | 119 | 00:00 | 0 | 7 | New controller installed, ref EC-xxxx |
| 71100411 | 1996 | 100 | 00:00 | 0 | 9 | Modified R8 to R7 pin 70 output on A16 card TCG part of EC-5941-624B. |
| 71100411 | 1996 | 032 | 00:00 | 0 | 6 | Installed OAM 6 and upgrade EC-6033-628 |
| 71100411 | 1995 | 332 | 05:00 | 0 | 99 | Installed new optical disk, both sides initialized. |
| 71100411 | 1995 | 298 | 00:00 | 0 | 99 | Installed new optical disk. |
| 71100411 | 1995 | 269 | 00:00 | 0 | 11EC-596 | Radar Interlock debugging in progress. |
| 71100411 | 1995 | 215 | 00:00 | 0 | 99 | Repaired broken wire 3BG50 and replaced chip @ 1BD25. |
| 71100411 | 1995 | 125 | 23:15 | 0 | 99 | Power outage; restarted GCP 08/2230Z |
| 71100411 | 1995 | 115 | 05:10 | 0 | 99 | HP Optical side A off, side B on. |
| 71100411 | 1995 | 103 | 00:00 | 0 | 7 | Completed EC 5884 tracking scope installation. |
| 71100411 | 1995 | 095 | 09:47 | 0 | 99 | C-field adjustment from 480 to 475. |
| 71100411 | 1995 | 095 | 00:00 | 0 | 99 | FMCRd EC-3636-62B Omega Phone Installation. |
| 71100411 | 1995 | 086 | 00:00 | 0 | 9.02.01 | Installed new GPS antenna. |
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