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.