NOTES ON [UTC - UTC(k)], Last Updated for TAI1304 56384 56409 T304 by F3s5 Lab . --- Notes --- AOS . Time step of UTC(AOS) of + 400 ns on MJD = 50832.34 Time step of UTC(AOS) of - 500 ns on MJD = 51063.30 Time step of UTC(AOS) of -13940 ns on MJD = 51625 Change of master clock on MJD = 52122. Time step of UTC(AOS) of -400 ns on MJD = 52794.6 Frequency step of UTC(AOS) of +1.642 ns/d on MJD = 52871.45 Time step of UTC(AOS) of +200 ns on MJD 52871.4 Time step of UTC(AOS) of +28.5 ns on MJD = 53219.5 due to change of receiver calibration. On MJD 54374, Oct.01st, 2007 at 12:00 UTC, change of master clock. New clock - the source of UTC(AOS) will be active hydrogen maser with auto-tuning: Kvarz, CH1-75A, s.n. 055106. The previous clock Cs[1351660]will be used as a back-up. Change of master clock on MJD 54374.5 From 29.01.2008 (MJD: 54494),10:15 UTC the source of UTC(AOS) is again active h-maser [1404601]. There was no phase jump during the switch. Change of master clock on MJD 54494.4 Change of master clock on MJD 54553.4. Change of master clock on MJD 54556.4. APL . Apparent time step of UTC-UTC(APL) of 200 ns between MJD = 54824.6 and MJD = 54829.6. Apparent time step of UTC-UTC(APL) of -1050 ns between MJD = 50924 and MJD = 50929. Apparent time step of UTC-UTC(APL) of about - 4750 ns between MJD = 50944 and MJD = 50949. Apparent time step of UTC-UTC(APL) between MJD = 51079 and MJD = 51084. Applied Physics Laboratory, Laurel, MA, USA. Apparent time step of [UTC - UTC(APL)] of 100 ns between MJD 53065 and 53066. On MJD 53481.76 the time code generator which converts UTC(APL) 5 MHz to 1PPS was replaced due to faulty operation. I was able to slew it back to within 2 nanoseconds of it's original value. Therefore, you may see a 2 nanosecond step in our clock data. Also UTC(APL) - GPS stepped by -35 nanoseconds. Time step of UTC(APL) of -35 ns on MJD 53481. The crystal oscillator on APL maser serial number 238, BIPM number 1403109 was replaced on MJD 53646. This caused a phase step of about 85 nanosecond. The VCO Phase Voltage has now stabilized and the data from MJD 53649 should be usable. The crystal oscillator on APL maser serial number 238, BIPM number 1403109 was replaced on MJD 53646. This caused a phase step of about 85 nanosecond. The VCO Phase Voltage has now stabilized and the data from MJD 53649 should be usable. On Saturday October 22, 2005 (MJD 53665) there was a power interruption to our microphase-stepper and our time code generator which converts 5mhz to 1PPS. This corrupted our GPS data and caused a 1 microsecond set in UTC(APL) when the power returned. When everything was corrected, the result was a -25 nanosecond step in UTC(APL) and a +59 nanosecond step in our clock data. Therefore, a -59 nanosecond step was made to our 5mhz to correct our clock measurements. This also stepped our 1PPS an additional -59 nanoseconds. The total result was a step of -84 nanoseconds to UTC(APL). Consequently, the APL GPS data will show a step of -25 nanoseconds on MJD 53668 and another step of -59 nanoseconds on MJD 53669.6. We will slowly slew UTC(APL) to UTC at a rate of 1 nanosecond per day. Also, all clock data that showed time steps were adjusted to maintain continuity. Time step of UTC(APL) of -84 ns on MJD 53665. The crystal oscillator on APL maser serial number 238, BIPM number 1403109 was APL maser BIPM number 140317 shut down on MJD 54334 at 13:30 UTC. Maser started two hours later. The frequency of the maser (UTC(APL)-Maser) before shut down was 2.39E-4ns/sec and the drift was 3.88E-7ns/sec. The frequency measured after it was restarted from MJD 54336 to MJD 54339 was 2.37E-4ns/sec. The maser seems to have settled down and the data beginning on MJD 54336 should be useable. After restart there was a phase-step of -88 nanoseconds in the data. As the result of a USNO portable clock calibration on MJD 54902, the APL GPS time transfer receiver cabledelay was changed +9.1 nanoseconds on MJD 54935 at 16:17 UTC. On March 1, 2010 MJD 55256 at 15:00 UTC, the reference to UTC(APL)was switch from APL Cesium#1 HP 5071A Serial Number 3608A00904,BIPM Number 1350904 to APL Maser#1 Sigma Tau MHM-2010 Serial Number 0100000220, BIPM Number 1403107. Also, the microphaser-stepper was replaced with a frequency synthesizer. This caused a +62 nanosecond step in the UTC(APL) 1PPS and 5MNz phase signals. The step will be gradually removed over a period of 30 days or less to validate our new steering algorithm. There was a -78 nanosecond phase step in the APL Cesium#3, BIPM#1351791 data on MJD 55345. The frequency did not change. Clock Number 1350904 is failing and the 5MHz output has become unstable. Disregard all data from this cesium beginning on MJD 55383.  The UTC(APL) 1PPS has been adjusted to be within 10 nanoseconds of where it was before the UPS power interruption.  You can begin using APL GPS data as of MJD 55463.   The clock data can also be used as of MJD 55463. AUS . From September 1, 1998, UTC(AUS) has been realized at the National Measurement Laboratory, Sydney, Australia. Change of master clock on MJD = 51162.0 Frequency step of UTC(AUS) of +5.27 ns/d on MJD = 51303.0 Change of master clock between MJD = 51874 and MJD = 51879. Frequency step of UTC(AUS) of +3.0240 ns/d on MJD = 51635.00 Frequency step of UTC(AUS) of -3.2832 ns/d on MJD = 51899.33 NML is no longer part of CSIRO, having become the National Measurement Institute (NMI) on 1 July 2004. 1. No data 1405402 (Maser 2 at NMI) >EXCEPT< MJD 53264 due to maintenance. 2. no data available for 1405403 (Tidbinbilla) on MJD 53464. 3. No data available for clocks 1360249, 1990001 and 1405403 (clocks in Tidbinbilla) on MJD's 53469. No data for clocks 1405403 and 1360249 (Tidbinbilla) for MJD 54254. No data for clocks 1405401, 1405402 for MJD 54314 to 54329. New clock this month : Type : 5071AH Caesium with high performance tube.Designation : 1352269. Location : NMI (Sydney) We have completed a change in our local realisation of UTC, from the old clock 1360340 to the new clock 1352269. The change was completed just prior to 00 UTC 54587 (1 May 2008). The epoch of 1352269 was delayed by 558 ns, to be as close as possible to the epoch of 1360340. The frequency steer applied to 1352269 was adjusted from -57e-15 before the changeover to -76e-15 after the changeover, that is a decrease in rate by 19e-15. This should minimise the frequency offset of UTC(AUS) with respect to UTC. UTC(Aus) was changed from clock 1360340 clock 1352269 at 00 UTC 54587 (1 May 2008). The epoch of 1352269 was delayed by 558 ns, to be as close as possible to the epoch of 1360340. The frequency steer applied to 1352269 was adjusted from -57e-15 before the changeover to -76e-15 after the changeover, that is a decrease in rate by 19e-15. Change of master clock on MJD 54587.0. : Apparent time step of UTC(AUS) of +13 ns between MJD 55709 and 55714 due to calibration. BEV . On MJD = 51305.58, time step of UTC(BEV) of + 9950 ns and frequency step of + 31.71 ns/d. Apparent time step of UTC-UTC(BEV) between MJD = 52364 and MJD = 52369 due to change of GPS receiver. Time step of UTC(BEV) of 100 ns on MJD = 53110.38 e did a frequency step on clock 1351793 at MJD 53445. We did a frequency step on clock 1351793 at MJD 53577. Time step of UTC(BEV) of -100 ns on MJD 53614.4. Time step of UTC(BEV) of +100 ns on MJD 53950.5. Time step of UTC(BEV)of -100 ns on MJD 54438.6. We did a frequency step of Clock 1793 on MJD 54493. : Time step of UTC(BEV) of 50 ns on MJD 54696.60. We have done the change of parameter INT DLY on MJD 54717. Time step of UTC(BEV) of -100 ns on MJD 54838.6 : Change of master clock on MJD 55348.35. BEV changed the Master Clock on MJD 56014 12:30 UTC. Clock number of the new Master Clock is 1351793. Time difference between new and old Master Clock at MJD 56014,52: UTC(1351793)-UTC(1351065)=20,3 ns : Change of master clock on MJD 56014.53. BIM . Time step of UTC(NMC) of about -1357 ns between MJD 53429 and 53434 due to change of receiver. Bulgarian Institute of Metrology, formerly NMC. : Time step of UTC(BIM) of about -260 ns on MJD 54950 due to change of receivers. : Change of master clock on 54950. : Apparent time step of about +70 ns on MJD 56016. Apparent time step of UTC(BIM) of about +1863 ns near MJD 56336. BIRM. Change of master clock on MJD = 52156. Apparent time step of [UTC-UTC(BIRM)] of about -900 ns on MJD 53370. Apparent time step of [UTC-UTC(BIRM)] on MJD 53403 due to change of GPS antenna coordinates. We have modified the "REF DLY" of our multi-channel gps receiver since Sep.19th. Corrected values /ns: MJD UTC-UTC(BIRM) 54364 -3747.1 54369 -3775.8 54374 -3804.8 54379 -3836.1 54384 -3865.0 54389 -3888.6 54394 -3921.7 54399 -3952.5 : Time step of UTC(BIRM) of about -12850 ns on MJD 55628. : Apparent time step of UTC(BIRM) of about -260 ns on MJD 55791. : Apparent time step of UTC(BIRM) of about -3800 ns on MJD 55987 due to change of master clock. From MJD 56201, use of micro-phase stepper. Apparent time step of UTC(BIRM) of about -350 ns near MJD 56231. BY . Belarussian State Institute of Metroloy, Minsk. Time step of UTC(BY) of +500 ns on MJD 54229. In MJD 54394,00 UTC(BY)scale on 200 ns correction is done. Time step of UTC(BY) of +200 ns on MJD 54394.0 In MJD 54559,00 UTC(BY)scale on 300 ns correction is done. Time step of UTC(BY) of 300 ns on MJD 54558.99. At MJD 54642,62 the delay REF DLY of the reference signal receiver for GPS was changed from -44,7 ns to 101,8 ns. : Apparent time step of UTC(BY) of about 230 ns on MJD 54709. : Apparent time step of UTC(BY) of about 256 ns between MJD 54709 and 54714. In MJD 54899,00 UTC(BY)scale on a minus 300 ns correction is done. : Time step of UTC(BY) of 300ns on MJD 54899. In MJD 55019,00 UTC(BY)scale on a 300 ns correction is done. In MJD 55019,00 UTC(BY)scale on a minus 300 ns correction is done. : Time step of UTC(BY) of +300 ns on MJD 55019.00. In MJD 55139,00 UTC(BY)scale on a 100 ns correction is done. : Time step of UTC(BY) of +100 ns on MJD 55139.00. In MJD 55219,00 UTC(BY)scale on a 100 ns correction is done. : Time step of UTC(BY) of +100 ns on MJD 55219.0. In MJD 55297,01 UTC(BY)scale on a 100 ns correction is done. : Time step of UTC(BY) of +100 ns on MJD 55297.01. In MJD 55349.01 UTC(BY)scale on a 100 ns correction is done. : Time step of UTC(BY) of +100 ns on MJD 55349.01. It has been changed the delay of combined receiver of standard signals (GPS/GLONASS) No 001 006 to 10 ns for signals GPS (INT DLY) in MJD= 55385 10 H 10 M UTC Frequency correction in UTC(BY) MJD 55435,01 Df/f[UTC(BY)new – UTC(BY)old] = 3•10-14 In MJD 55454,01 UTC(BY)scale on a 100 ns correction is done. Frequency correction in UTC(BY) MJD 55455,00 Df/f[UTC(BY)new – UTC(BY)old] = 1.3•10-14 : Time step of UTC(BY) of 100 ns on MJD 55454.01. Frequency correction in UTC(BY) MJD 55495,00 Df/f[UTC(BY)new – UTC(BY)old] = 1,3•10-14 : Time step of UTC(BY) of +90 ns on MJD 55539.01. : Time step of UTC(BY) of +100 ns on MJD 55632.0. : Time step of UTC(BY) of +50 ns on MJD 55718.95. In MJD 55805,00 UTC(BY) scale on a 70 ns correction is done. : Time step of UTC(BY) of +70 ns on MJD 55805.0. In MJD 55969,00 UTC(BY)scale on a 80 ns correction is done. : Time step of UTC(BY) of +80 ns on MJD 55969.0. CAO . Apparent time step of UTC-UTC(CAO) between MJD = 52394 and MJD = 52399 due to change of GPS antenna coordinates. CH . Time step of UTC-UTC(CH) of + 14 ns between MJD = 50994 and MJD = 50999 due to GPS link calibration. Frequency steps of UTC(CH) in ns/d : MJD Freq. step MJD Freq. step MJD Freq. step 50853 +0.67 51453 +8.21 52093 -4.22 50913 +0.05 51523 -3.50 52143 +1.77 50973 -6.15 51643 -2.45 52190 +2.95 51033 -0.09 51763 -0.38 52207 -1.30 51093 +0.53 51823 -4.88 52233 +0.42 51153 +0.7 51883 -1.61 52291 -0.80 51213 +3.37 51943 -0.33 52316 +6.00 51273 -0.67 52003 +1.80 52354 -2.50 51333 -7.24 52063 +1.14 52437 -1.00 52476 +2.30 52562 -1.50 52625 -1.20 52688 +0.60 52704 -4.00 52821 +2.46 Frequency step of UTC(CH) of -4.0 ns/d on MJD = 52891 Relative rate correction applied to UTC(CH) = -1.6 ns/d. Relative rate correction applied to UTC(CH) = 1.04 ns/d on MJD = 52988. Former rate of UTC(CH) relative to TA(CH)= 29.85 ns/d New rate of UTC(CH) relative to TA(CH) = 30.89 ns/d relative rate correction applied to UTC(CH) = -1.37 ns/d on MJD 53047 former rate of UTC(CH) relative to TA(CH) = 28.72 ns/d new rate of UTC(CH) relative to TA(CH) = 27.35 ns/d Please take note that following publication of Circular T N°195 we have performed a steering of UTC(CH) on day MJD 53114. relative rate correction applied to UTC(CH) = -2.00 ns/d former rate of UTC(CH) relative to TA(CH) = 27.35 ns/d new rate of UTC(CH) relative to TA(CH) = 25.35 ns/d steering of UTC(CH) was performed on MJD 53173. relative rate correction applied to UTC(CH) = -1.30ns/d former rate of UTC(CH) relative to TA(CH) = 23.55 ns/d new rate of UTC(CH) relative to TA(CH) = 22.25 ns/d steering of UTC(CH) was performed on MJD 53233. elative rate correction applied to UTC(CH) = -1.80ns/d ormer rate of UTC(CH) relative to TA(CH) = 22.25 ns/d ew rate of UTC(CH) relative to TA(CH) = 20.45 ns/d steering of UTC(CH) was performed on MJD 53261. elative rate correction applied to UTC(CH) = -2.10 ns/d ormer rate of UTC(CH) relative to TA(CH) = 20.45 ns/d ew rate of UTC(CH) relative to TA(CH) = 18.35 ns/d steering of UTC(CH) was performed on MJD 53295. elative rate correction applied to UTC(CH) = +1.63 ns/d steering of UTC(CH) was performed on MJD 53326. elative rate correction applied to UTC(CH) = -2.56 ns/d steering of UTC(CH) was performed on MJD 53326. elative rate correction applied to UTC(CH) = -2.56 ns/d steering of UTC(CH) was performed on MJD 53436. elative rate correction applied to UTC(CH) = -2.00 ns/d A steering of UTC(CH) was performed on MJD 53473. Relative rate correction applied to UTC(CH) = -2.00 ns/d We have changed the REF clock on the CH00 WAB1 P3 TAI link GPS receiver. The original REF clock was 1360354. The new REF clock is 1360413. The change occurred on MJD 53520 at epoch UTC 11:30. A steering of UTC(CH) was performed on MJD 53536. relative rate correction applied to UTC(CH) = -1.4 ns/d An exceptional steering of UTC(CH) was performed on MJD 53548. relative rate correction applied to UTC(CH) = 1.1 ns/d A steering of UTC(CH) was performed on MJD 53564. Relative rate correction applied to UTC(CH) = 1.0 ns/d A steering of UTC(CH) was performed on MJD 53583. Relative rate correction applied to UTC(CH) = -1.5 ns/d A steering of UTC(CH) was performed on MJD 53583. Relative rate correction applied to UTC(CH) = -1.5 ns/d step of -8.9 ns to UTC(CH) on MJD 53986 in order to restore the calibration of the TAI link on MJD 53986 you should observe a step of +8.9 ns of all the clocks versus UTC(CH) and continuity of all the clocks vs TA(CH) and TAI. Time step of UTC(CH) of -8.9 ns on MJD 53986. : Change of master clock on MJD 55078. On MJD 55152 we have temporarily switched UTC(CH) from Master Clock A (MCA) to Master Clock B (MCB) for the purpose of maintenance of our hydrogen maser CLK 1405701. As a consequence there is an apparent step of 10 ns during the first half of MJD 56152. From January 1st, 2013 the Federal Office of Metrology becomes the Federal Institute of Metrology. CNM . Change of master clock on MJD = 51360.0 and on MJD = 52075. Apparent time step of UTC-UTC(CNM) between MJD = 52224 and MJD = 52229. Change of master clock on MJD = 52270. Frequency steps of UTC(CNM) in ns/d : MJD Freq. step 50859 +8.813 51265.04 +11.49 51529.88 -7.08 52320.94 -1.039 Change of master clock on MJD = 52994.8, new clock is 1351815 At the MJD 53970, 15:50 UTC, was a power failure that affected the comparison between 1351815 (Master clock) and the 1407301 (Maser) clocks. At the MJD 54038, 15:40 UTC, was a power failure that affected the comparison between 1351815 (Master clock) and the 1407301 (Maser) clocks. Unfortunately, both clocks were reset by the power failure. The other local clocks were unaffected by the power failure. Due to the 1 pps of the 1351705 clock is maintained under synchronization with the UTC(CNM), the 1 pps of the master clock was reestablished immediately after the power failure using the 1 pps of the clock 1351705 as reference. The near real time SIM time and frequency comparison network was used to make a cross checking of the re-synchronization process. MJD 54203, at 15 hours UTC, there was a flaw in the Hydrogen Maser ID number 1407301, causing a jump in the phase of approximately 60 ns. : Change of master clock on MJD 56033. CNMP. Centro Nacional de Metrologia de Panama I written to you to communicate the changes we made to our Atomic Clock, what is the realization of UTC(CNMP) This is our report : 54052.708 *361752 0000000.0 -212,656 CNMP XXXXX Change of master clock on MJD 54402. Frequency step of UTC(CNMP) of 41.98 ns/d between MJD 54402.9 and 54408. In August 13th, we introduce a frequency correction on the master clock. The data is: 54691.71 1361806 0000000.0 -009.331 CNMP 10088 In February 10th, we introduce a frequency correction on the master clock The data is: 54872.42 1361806 0000000.0 -003.888 CNMP 10088 In April 9th, we introduce a frequency correction on the master clock. The data is: 54930.70 1361806 0000000.0 +0004.601 Frequency correction in the CENAMEP master clock: 55235.77 1361806 0000000.0 -003.283 The master clock in the CENAMEP was adjusted in frequency. This is the data of the correction: 55356.57 1361806 0000000.0 +002.765    DLR . Erratum, corrected uncertainty values for Circular T 261: uB/ns u/ns DLR : 5.1 5.1 DMDM. Bureau of Measures and Precious Metals, Belgrade, Serbia and Montenegro. Apparent time step of [UTC-UTC(ZMDM)] of about -4250 ns between MJD 54074 and 54079. Directorate of Measures and Precious Metals, formerly ZMDM. : Apparent time step of UTC(DMDM) of about +6580 ns between MJD 55194 and 55199. frequency step of 6.829 E-14 applied at MPS on 55200.50 A new frequency correction is applied to UTC(DMDM) on MJD 55307,5 (12:00:00 UTC). The new value is 7,5 E-14, or 6,48 ns/day. (The old one was 6,829 E-14, or 5,9 ns/day). UTC(DMDM) is cesium beam clock 1362033 plus MPS. Frequency step is applied at MPS. The difference between UTC(DMDM) and the clock was 7231,3 ns at the moment of the frequency correction change (MJD 55307,5). UTC(DMDM) is cesium beam clock 1362033 plus MPS UTC(DMDM) is cesium beam clock 1362033 plus MPS UTC(DMDM) is cesium beam clock 1362033 plus MPS. frequency step of 4.231 E-14 (3.66 ns/day) applied at MPS on 55456.50 frequency step of 6.227 E-14 (5.38 ns/day) applied at MPS on 55459.50 frequency step of 3.912 E-14 (3.38 ns/day) applied at MPS on 55470.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS. Frequency step of 3.912 E-14 (3.38 ns/day) applied at MPS on 55470.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS. Frequency step of 6.134 E-14 (5.3 ns/day) applied at MPS on 55526.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 9.838 E-14 (8.5 ns/day) applied at MPS on 55540.50 frequency step of 6.944 E-14 (6.0 ns/day) applied at MPS on 55560.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 7.060 E-14 (6.10 ns/day) applied at MPS on 55621.50 frequency step of 8.565 E-14 (7.40 ns/day) applied at MPS on 55641.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 7.500 E-14 (6.48 ns/day) applied at MPS on 55680.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 6.829 E-14 (5.90 ns/day) applied at MPS on 55823.50 frequency step of 5.787 E-14 (5.00 ns/day) applied at MPS on 55846.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 7.986 E-14 (6.90 ns/day) applied at MPS on 55932.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 7.986 E-14 (6.90 ns/day) applied at MPS on 55932.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 7.847 E-14 (6.78 ns/day) applied at MPS on 56021.50 frequency step of 7.639 E-14 (6.60 ns/day) applied at MPS on 56027.50 frequency step of 7.060 E-14 (6.10 ns/day) applied at MPS on 56035.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 8.565 E-14 (7.40 ns/day) applied at MPS on 56232.50 frequency step of 9.722 E-14 (8.40 ns/day) applied at MPS on 56246.50 frequency step of 9.259 E-14 (8.00 ns/day) applied at MPS on 56258.50 UTC(DMDM) is cesium beam clock 1362033 plus MPS frequency step of 7.500 E-14 (6.48 ns/day) applied at MPS on 56265.50 frequency step of 6.829 E-14 (5.90 ns/day) applied at MPS on 56267.50 frequency step of 0.000 E-14 (0.00 ns/day) applied at MPS on 56273.50 frequency step of 5.787 E-14 (5.00 ns/day) applied at MPS on 56275.50 frequency step of 7.500 E-14 (6.48 ns/day) applied at MPS on 56278.50 frequency step of 8.565 E-14 (7.40 ns/day) applied at MPS on 56286.50 DTAG. Apparent time step of UTC-UTC(DTAG) of -100 ns between MJD = 50814 and MJD = 50819. Apparent time step of UTC-UTC(DTAG) of +85 ns between MJD = 50894 and MJD = 50899. MJD Freq. step 51057 +2.765 51553 -0.605 51764 -3.802 On MJD 52949 at 10:00 UTC the steer value of clock # 1360465 from 38 E-15 to set 19 E-15. On MJD 53030 13:3O UTC we changed the steer value of clock # 1360136 from 158 E-15 to 298 E-15. Apparent time step of [UTC-UTC(DTAG)] of about -200 ns between MJD 53239 and 53244. Correction to Circular T 200 note (2): No time step of [UTC-UTC(DTAG)] between MJD 53239 and 53244. On MJD 53674 at 12:30 h the steer value of our master clock 1360465 was changed from 6 E-15 to -6 E-15. On MJD 54178 at 11:00 h the steer value of our clock 1360136 on 950 E-15. On MJD 54318 9.am the steer value of our clock 1360136 was changed from 950 E-15 to 1000 E-15. On MJD 54585 at 11:00 h the steer value of our clock 1360136 was changed from 899 E-15 to 773 E-15. Steering for CLOCK 11360465: On MJD 55322 at 09:00 UTC the steer value of our master clock 1360465 was changed from 51e-15 to 19e-15 On MJD 55347 at 07:00 UTC the steer value of our master clock 1360465 was changed from 19e-15 to 6e-15 On MJD 55372 at 07:00 UTC the steer value of our master clock 1360465 was changed from  6e-15 to -6e-15. On MJD 55382 at 07:00 UTC the steer value of our master clock 1360465 was changed from -6e-15 to -32e-15. On MJD 55522 at 07:00 UTC the steer value of our master clock 1360465 was changed from -32e-15 to 0e-15. From MJD 55592 on,  we're sending daily link datas of our new master clock 1352635, instead of old 1360465 wich is end of life. The initial steering of 1352635 is 152e-15. On MJD 55720 at 07:00 UTC the steer value of our master clock 1352635 was changed from 152e-15 to 165e-15. On MJD 55761 at 07:00 UTC the steer value of our master clock 1352635 was changed from 165e-15 to 177e-15 On MJD 55809 at 11:00 UTC the steer value of our master clock 1352635 was changed from 177e-15 to 184e-15. On MJD 55855 at 07:00 UTC the steer value of our master clock 1352635 was changed from 184e-15 to 190e-15 On MJD 55987 at 09:00 UTC the steer value of our master clock 1352635 was changed from 209e-15 to 202e-15. On MJD 56152 at 12:00 UTC the steer value of our master clock 1352635 was changed from 209e-15 to 234e-15. On MJD 56294 at 14:15 UTC the steer value of our master clock 1352635 was changed from 234e-15 to 247e-15. On MJD 56306 at 07:50 UTC the steer value of our master clock 1352635 was changed from 247e-15 to 260e-15. EIM . Hellenic Institute of Metrology, Thessaloniki. Due to a malfunction our recording system failed, so we cannot provide data files for July. ESTC. European Space Research and Technology Centre, Noordwijk, The Netherlands. Time step of UTC(ESTC) of +28 ns between MJD 56259 and 56264 due to cable reconfiguration. Apparent time step of UTC(ESTC) of -53 ns on MJD 56322.0 due to receiver calibration. GUM . Time step of UTC(GUM) of +1700 ns and frequency step of UTC(GUM) of +2.678 ns/d on MJD = 51366.52 Apparent time step of UTC(GUM) between MJD = 51634 and MJD = 51639 due to change of GPS equipment. Time step of UTC(GUM) of -750 ns on MJD = 51843.46 Change of master clock on MJD = 51920.65 HKO . Hong Kong Observatory, Hong Kong ( China). We have performed on MJD 53205.11 (19 July 2004) both the clock step adjustment and the frequency steering. The clock step adjustment is +0.9 microsecond and frequency steering is +13.13 ns/day. Time step of UTC(HKO) of -900 ns on MJD = 53205.11 : Time step of UTC(HKO) of +100 ns on MJD 55293.35. : Time step of UTC(HKO) of 100 ns on MJD 55435.33. INTI. : Instituto Nacional de Tecnologia Industrial, Buenos Aires, Argentina INXE. INMETRO - National Institute for Metrology and Technology - Time and Frequency Laboratory, Rio de Janeiro, Brazil. IPQ . : Instituto Portugues da Qualidade, Caparica, Portugal. Due to a power short circuit yesterday (MJD 55308) at around 15 UTC in the Laboratory, all the equipment was shutdown. As soon as possible we start again a new scale. : Time step of UTC(IPQ) of +15 ns on MJD 55494.2. On MJD 55571,4388 steering of UTC(IPQ) of 2.025E-7 On MJD 55608,467940 IPQ begun a 10 MHz frequency steering of -7.7160994E-14 Hz After repaired TTS4 receiver is working. We changed the coordinates of antenna and delays. At MJD 55622.44 I have stopped the steering. Today MJD 55631.65 I begun a 10 MHz frequency steering of -7.7160494E-14 Hz. At MJD 55634.54 I have stopped the steering of -7.7160494E-14 Hz. Today MJD 55634.55 I begun a 10 MHz frequency steering of -3.4722222E-13. Due to a malfunction on equipment, we made on MJD 555645,534 a time step of 200 ns in all our clocks : Time step of UTC(IPQ) of +200 ns on MJD 55645.53. On MJD 55657.54 I stop a 10 MHz frequency steering of -5.50154E-13 Hz. On MJD 55664.41 I begun a 10 MHz frequency steering of -1.041666E-13 Hz. On MJD 55669.39 I stopped a 10 MHz frequency steering of -1.041666E-13 Hz. On MJD 55669.63 I begun a 10 MHz frequency steering of -4.6296295E-14 Hz. On MJD 55677.39 I stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. On MJD 55680.63 I begun a 10 MHz frequency steering of -2.6041666E-14 Hz. On MJD 55683.47 I stopped a 10 MHz frequency steering of -2.6041666E-14 Hz. On MJD 55683.47 I begun a 10 MHz frequency steering of -4,1666665E-14 Hz. On MJD 55697.433 I stopped a 10 MHz frequency steering of -4,1666665E-14 Hz. At MJD 55697.435 I begun a 10 MHz frequency steering of +4,166665E-14 Hz. On MJD 55700,581 I stopped a 10 MHz frequency steering of +4,166665E-14 Hz. At MJD 55701.415 I begun a 10 MHz frequency steering of -2,4884259E-14 Hz. On MJD 55705,630 I stopped a 10 MHz frequency steering of -2,4884259E-14 Hz. At MJD 55706,594 I begun a 10 MHz frequency steering of +1,1574074E-14 Hz. On MJD 55707,407 I stopped a 10 MHz frequency steering of +1,1574074E-14 Hz. At MJD 55707,409 I begun a 10 MHz frequency steering of +2.314814E-14 Hz. On MJD 55707,513 I stopped a 10 MHz frequency steering of +2.314814E-14 Hz. At MJD 55707,513 I start a 10 MHz frequency steering of -3.0092592E-14 Hz. At MJD 55712,416 I stop a 10 MHz frequency steering of -3.0092592E-14 Hz and start a 10 MHz steering of -4,9768517E-14 Hz. At MJD 55712,416 I stop a 10 MHz frequency steering of -3.0092592E-14 Hz and start a 10 MHz steering of -4,9768517E-14 Hz. On MJD 55718,417 I stopped a 10 MHz frequency steering of -4,9768517E-14 Hz. At MJD 55718,417 I start a 10 MHz frequency steering of -8.4876541E-14 Hz. On MJD 55719,482 I stopped a 10 MHz frequency steering of -8.4876541E-14 Hz. On MJD 55719,83 I start a 10 MHz frequency steering  of -4.6296295E-14 Hz. On MJD 55723,305 I stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55727,632 I start a 10 MHz frequency steering of -1.6354166E-14 Hz. On MJD 55728.37 I stop a 10 MHz frequency steering of -1.6354166E-14 Hz and start a 10 MHz frequency steering of -4.6296295e-14. On MJD 55738.375 stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55740,295 I start a 10 MHz frequency steering of -4.6296295E-14. On MJD 55748.867 stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. On MJD 55759.324 stopped a 10 MHz frequency steering I start a 10 MHz frequency steering  of -4.6296295E-14. On MJD 55762.312 stopped a 10 MHz frequency steering of -4.6296295E-14. At MJD 55762,313 I start a 10 MHz frequency steering of -1.8865740E-14. At MJD 55771.623 stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55775.392 I start a 10 MHz frequency steering of -3.47222216E-14 Hz. At MJD 55784.731 I stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55785.639 I start a 10 MHz frequency steering  of -4.0509258E-14 Hz. At MJD 55786.678 I stop and start a 10 MHz frequency steering of -4.6296295 E-14 At MJD 55788.856 I stop the 10 MHz frequency steering. At MJD 55790.85 I start a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55797,42 I stop At MJD 55799.935 I start a 10 MHz frequency steering of -4.4296295E-14Hz. At MJD 55800.327 stop and start a steering of 4.4296295E-14Hz. At MJD 55804.399 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55805.303 I start a steering of -4.6296295E-14Hz. At MJD 55806.627 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55808.344 I start a steering of -4.6296295E-14Hz. At MJD 55810.325 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55811.613 I start a steering of -4.6296295E-14Hz. At MJD 55816.598 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55821.312 I start a steering of -4.6296295E-14Hz. At MJD 55825.318 I stop a 10 MHz frequency steering of -4.6296295E-14Hz. At MJD 55825.319 I start a steering of -9.2592590E-14Hz. At MJD 55829.407 I stop a 10 MHz frequency steering of -9.2592590E-14Hz. At MJD 55829.408 I start a steering of -4.6296295E-14Hz. AT MJD 55839.661 I stop a 10 MHz frequency steering of  -9.2592590E-14Hz and At 55840.338  stop a 10 MHz frequency steering of   9.2592590E-14Hz and I start a 10 MHz frequency steering of -1.1574074E-13Hz AT MJD 55854.328 I stop a 10 MHz steering of 6.9444442E-14 Hz and I start 10 MHz steering of -6.9444442E-14 Hz At MJD 55911.378 stop a 10 MHz steering of -3.4722221e-14 Hz and start  a steering of -9.2592590e-14 Hz At MJD 55916.382 stop a 10 MHz steering of -9.2592590e-14 Hz and start  a steering of -6.9444442e-14 Hz At MJD 55917.356 stop a 10 MHz steering of -6.9444442e-14 Hz and start  a steering of 9.2592590e-14 Hz At MJD 55919.362 stop a 10 MHz steering of 9.2592590e-14 Hz At MJD 55919.729 start a 10 MHz steering of 9.2592590e-14 Hz At MJD 55920.389 stop a 10 MHz steering of 9.2592590e-14 Hz and start a steering of -9.2592590e-14 Hz At MJD 55922.806 stop a 10 MHz steering of -9.2592590e-14 Hz AT MJD 55923,365 start a 10 MHz steering of -6.9444442e-14 Hz At MJD 55936,882 stop a 10 MHz steering of 1,04166666e-13 Hz. At MJD 55938,381 start a 10 MHz steering of -6.9444442e-14 Hz At MJD 55939,381 stop and start a 10 MHz steering of -9.2592590e-14. At MJD 55942,572 stop  a 10 MHz steering of -9.2592590e-14. At MJD 55943,656 start a 10 MHz steering of 6.9444442e-14 Hz. At MJD 55945,355 stop a 10 MHz steering of 6.9444442e-14 Hz and start a 10 MHz steering of -9.2592590e-14Hz. At MJD 55946,447 stop a 10 MHz steering of -9.2592590e-14 Hz and start a 10 MHz steering -1.0416666e-13Hz. At  MJD 55948,808 stop a 10 MHz steering of -1.0416666e-13Hz. At MJD 55949,664 start a 10 MHz steering of 9.2592590e-14Hz At MJD 55950.336 stop and start a 10 MHz steering of 9.2592590e-14Hz At MJD 55950.340  and start a 10 MHz steering of -6.9444442e-14Hz At MJD 55952.359  stop a 10 MHz steering -6.9444442e-14Hz and start a 10 MHz steering of -8.6805553e-14Hz At MJD 55955.653 stop a 10 MHz steering -8.6805553e-14Hz. : Time step of UTC(IPQ) of about -2100 ns on MJD 55932.355. At MJD 55971.779 start a 10 MHz steering -6.9444442e-14Hz At MJD 55972.373 start a 10 MHz steering -8.6805553e-14Hz At MJD 55974.816 stop a 10 MHz steering At MJD 55977.380 start a 10 MHz steering -9.259259e-14Hz At MJD 55980.348 start a 10 MHz steering -2.3148147e-14Hz At MJD 55982.785 stop a 10 MHz steering of -2.3148147e-14Hz At MJD 55990.370 start a 10 Mhz steering of -4.6296295e-14Hz At MJD 55995.372 stop a 10 Mhz steering of -4.6296295e-14Hz At MJD 55996.732 start a 10 Mhz steering of 6.9444442e-14Hz At MJD 55998.505 start a 10 Mhz steering of -4.6296295e-14Hz A tMJD 55999.352  start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56007.363 stop a 10 Mhz steering of -6.9444442e-14Hz At MJD 56008.355 start a 10 Mhz steering of -4.6296295e-14Hz At MJD 56009.351 start a 10 Mhz steering of -5.7870369e-14Hz At MJD 56010.373  start a 10 Mhz steering of -9.259259e-14Hz At MJD 56013.420 stop a 10 Mhz steering of -9.259259e-14Hz At MJD 56014.624 start a 10 Mhz steering of -5.3935184e-14Hz At MJD 56016.321 start a 10 Mhz steering of -9.259259e-14Hz At MJD 56018,333  start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56021.769 start a 10 Mhz steering of -9.259259e-14Hz At MJD 56022.306 stop a 10 Mhz steering of -9.259259e-14Hz At MJD 56024.485 start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56029.338 start a 10 Mhz steering of --4.6296295e-14Hz AT MJD 56029.797 stop a 10 Mhz steering of -6.9444442e-14Hz At MJD 56030.336 start a 10 Mhz steering of 6.9444442e-14Hz At MJD 56030.339 start a 10 Mhz steering of 6.9444442E-14Hz At MJD 56032.345 stop a 10 Mhz steering of 6.9444442E-14Hz At MJD 56032.351 start a 10 Mhz steering of -9.259259E-14Hz At MJD 56035.648 start a 10 Mhz steering of -2.3418147E-14Hz At MJD 56036.310 start a 10 Mhz steering of -1.975925E-15Hz At MJD 56036.644 start a 10 Mhz steering of -1.9675925E-13Hz At MJD 56037.795 start a 10 Mhz steering of -9.2592590E-14Hz At MJD 56040.300 start a 10 Mhz steering of -6.9444442E-14Hz At MJD 56042.753 start a 10 Mhz steering of -4.6296295E-14Hz At MJD 56043.318 stop a 10 Mhz steering of -4.6296295E-14Hz At MJD 56045.382 start a 10 Mhz steering of - 4.6296295E-14Hz At MJD 56046.314 start a 10 Mhz steering of  -9.259259E-14Hz At MJD 56050.312 strat a 10 Mhz steering of  -2.3148147E-13Hz At MJD 56050.839 start a 10 Mhz steering of -9.259259E-14Hz At MJD 56051.401 start a 10 Mhz steering of -4.6296295E-14Hz At MJD 56052.327 start a 10 Mhz steering of  4.6296295E-14Hz At MJD 56054.331 start a 10 Mhz steering of -9.259259E-14Hz At MJD 56057.310 start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56059.321 start a 10 Mhz sterring of -9.259259e-14Hz At MJD 56060.329 start a 10 Mhz sterring of -2.3148147e-14Hz At MJD 56068.612 start a 10 Mhz sterring of -6.9444442e-14Hz At MJD 56077.899 start a 10 MHz sterring of -6.9444442e-14Hz At MJD 56083.316 start a 10 MHz sterring of --8.1018516e-14Hz At MJD 56084.649 start a 10 MHz sterring of -5.7870369e-14Hz MJD 56086.556 start a 10 MHz steering of -- 9.2592590E-14 Hz MJD 56094.314 start a 10 MHz steering of – 5.7870269E-14 Hz MJD 56095.306 start a 10 MHz steering of – 9.2592590E-14 Hz MJD 56104.330 start a 10 MHz steering of – 6.9444442E-14 Hz MJD 56109.385 start a 10 MHz steering of – 9.2592590E-14 Hz MJD 56118.322 start a 10 MHz steering of –5.7870369E-14Hz MJD 56122.329 start a 10 MHz steering of –8.1018516E-14 Hz MJD 56128.312 start a 10 MHz steering of –9.2592590E-14 Hz MJD 56131.304 start a 10 MHz steering of –1.1574074E-13 Hz MJD 56134.333 start a 10 MHz steering of –9.2592590E-14 Hz MJD 56139.399 start a 10 MHz steering of –6.9444440E-14Hz MJD 56147.309 stop a 10 MHz steering MJD 56149.305 start a 10 MHz steering of –6.9444440E-14 Hz MJD 56151.304 start a 10 MHz steering of –9.2592590E-14 Hz MJD 56154.361 start a 10 MHz steering of –1.1574074E-13 Hz MJD 56157.645 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56166.341 start a 10 MHz steering of –9.2592590 E-14 Hz MJD 56171.300 start a 10 MHz steering of –1.5046296 E-14 Hz MJD 56172.320 start a 10 MHz steering of –2.6620370 E-13 Hz MJD 56173.317 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56176.585 stop a 10 MHz steering of -6.9444442 E-14 Hz MJD 56177.329 start a 10 MHz steering of - 5.7870369 E-14 Hz MJD 56178.314 start a 10 MHz steering of - 9.2592590 E-14 Hz MJD 56181.312 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56183.339 start a 10 MHz steering of – 4.6296295 E-14 Hz MJD 56185.329 start a 10 MHz steering of – 6.9444442 E-14 Hz MJD 56187.345 start a 10 MHz steering of –1.6203703 E-13 Hz MJD 56200.358 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56206.330 start a 10 MHz steering of –1.1340074 E-13 Hz MJD 56209.639 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56214.412 start a 10 MHz steering of –4.6296295 E-14 Hz MJD 56218.304 start a 10 MHz steering of –5.7370369 E-14 Hz MJD 56220.308 start a 10 MHz steering of –1.1574074 E-13 Hz MJD 56224.309 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56225.490 stop MJD 56226.302 start a 10 MHz steering of –4.6296295 E-14 Hz MJD 56227.327 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56230.367 start a 10 MHz steering of –9.2592590 E-14 Hz IT . Change of master clock on MJD = 52163. Frequency steps of UTC(IEN) in ns/d : MJD Freq. step 50822.4 +2.188 50962.5 -4.924 51126.4 +1.644 51322.4 -1.121 51392.6 -1.094 52465.438 +1.0942 Frequency step of master clock 1351373 from +11.4887 to +13.6771 ns/d on MJD = 52901.3 Frequency correction applied on cesium 351373 is +13.6771 ns/d. Time step of clock 1401101 of -1663.0 ns on MJD = 52920. Time step of clock 1401102 of -4909.0 ns on MJD = 52920. IEN MC is cesium 351373. The frequency correction applied on cesium 351373 is +12.0358 ns/d (6,331991 x 10E-15 x 22 x 86400). IEN MC is cesium 351373 The frequency correction applied on cesium 351373 is +12.0359 ns/d (6,331991 x 10E-15 x 22 x 86400). IEN MC is cesium 351373 the frequency correction applied on cesium 351373 is +12.0359 ns/d (6,331991 x 10E-15 x 22 x 86400). IEN MC is cesium 351373 the frequency correction applied on cesium 351373 is +12.0359 ns/d (6,331991 x 10E-15 x 22 x 86400). IEN MC is cesium 351373 on MJD 53193,6 the frequency correction applied on cesium 351373 was changed from: +12,0359 ns/d (6,331991 x 10E-15 x 22 x 86400) to +13,1300 ns/d (6,331991 x 10E-15 x 24 x 86400). C is cesium 351373 n MJD 53223,34 the frequency correction applied on cesium 351373 was changed from: +13,1300 ns/d (6,331991 x 10E-15 x 24 x 86400) to +14,2242 ns/d (6,331991 x 10E-15 x 26 x 86400). EN MC is cesium 351373 he frequency correction applied on cesium 351373 is +14,2242 ns/d (6,331991 x 10E-15 x 26 x 86400). is cesium 351373. The frequency correction applied on cesium 351373 +14,2242 ns/d (6,331991 x 10E-15 x 26 x 86400). C is cesium 351373. On MJD 53452,4 the frequency correction applied on cesium 351373 as changed from: +14,2242 ns/d (6,331991 x 10E-15 x 26 x 86400) to 13,1300 ns/d (6.331991 x 10E-15 x 24 x 86400). n MJD 53438 a time step of -3967.6 ns (advanced) was applied to the maser2 (code 1401102). IEN MC is cesium 351373: the frequency correction applied on cesium 351373 is +13.13 ns/d (6,331991 x 10E-15 x 24 x 86400). MC is cesium 351373. On MJD 53521,4 the frequency correction applied on cesium 351373 was changed from +13,1300 ns/d (6,331991 x 10E-15 x 24 x 86400) to 12,5829 ns/d (6,331991 x 10E-15 x 23 x 86400).On MJD 53521,4 time scale was delayed by 120,0 ns. IEN MC is cesium 351373. The frequency correction applied on cesium 351373 is +12.5829 ns/d (6,331991 x 10E-15 x 23 x 86400). Time step of UTC(IEN) of -120 ns on MJD 53521.4. IEN MC is cesium 351373. The frequency correction applied on cesium 351373 is +12.5829 ns/d (6,331991 x 10E-15 x 23 x 86400). MC is cesium 351373. The frequency correction applied on cesium 351373 is +12.5829 ns/d (6,331991 x 10E-15 x 23 x 86400). IEN MC is cesium 351373. On MJD 53619.43 the frequency correction applied on cesium 351373 was changed from +12.5829 ns/d (6,331991 x 10E-15 x 23 x 86400) to +15.3183 ns/d (6,331991 x 10E-15 x 28 x 86400). Note 1: Since MJD 53669,52 IEN MC is cesium 352118. The rate correction applied on cesium 352118 is +12,6144 ns/d (+146 x E-15). Note 2: Since MJD 53699,52 the steering of the IEN MC is no longer obtained by means of the internal microstepper, but using an external device (TST6490, n.s. 11165). Note 3: Since the same date, the steering on cesium 351373 is non longer applied. Change of master clock on MJD 53669.5. On MJD 53683,46 the frequency correction applied on cesium 352118 was changed from: +12,61 ns/d (+146 x E-15) to +12,18 ns/d (+141 x E-15). IEN MC is cesium 352118 Note 1: On MJD 53710.63 the frequency correction appliedon cesium 352118 was changed from:+12.18 ns/d (+141 x E-15) to +12.70 ns/d (+147 x E-15). Note 2: On MJD 53710.65 a frequency correction was applied to the maser 1401102. The frequency correction is +34.5501 [-7.04024 x E-17 x (-5680) x 86400]. Note 3: On MJD 53719.49 a time step of -8.0 ns (advanced) was applied to the cesium 352118. IEN MC is cesium 352118 On MJD 53752.58 the frequency correction applied on cesium 352118 was changed from: +12.70 ns/d (+147 x E-15) to +12.96 ns/d (+150 x E-15). IEN MC is cesium 352118 On MJD 53767.46 the frequency correction applied on cesium 352118 was changed from: +12.96 ns/d (+150 x E-15) to +13.74 ns/d (+159 x E-15). Istituto Nazionale di Ricerca Metrologica (I.N.RI.M), formerly IEN. IEN MC is cesium 352118. On MJD 53817.60 the frequency correction applied on cesium 352118 was changed from:+13.74 ns/d (+159 x E-15) to +14.60 ns/d (+169 x E-15). MC is cesium 352118 the frequency correction applied on cesium 352118 is +14.6016 ns/d (+169 x E-15). IEN MC is cesium 352118. The frequency correction applied on cesium 352118 is +14.6016 ns/d (+169 x E-15). IT MC is hydrogen maser 401102 Note 1: Since MJD 53909.35, the UTC(IT) is no longer generated by a cesium plus an external microstepper but by a hydrogen maser plus an AOG(Auxiliary Output Generator). Note 2: Since MJD 53909.35, the rate correction obtained by means of the AOG is: frequency correction: -0.8283 x E-13, drift correction: +3.28 x E-16/d Change of master clock on MJD 53909.35. IT MC is hydrogen maser 401102 plus AOG Since MJD 53933.58 the rate correction obtained by means of the AOG is: frequency correction: -7.3800 x E-14 drift corretction: +3.92 x E-16/d. IT MC is hydrogen maser 401102 plus AOG. Since MJD 53968.56 the rate correction obtained by means of the AOG is: frequency correction: -6.1044 x E-14 drift correction: +3.57 x E-16/d. IT MC is hydrogen maser 401102 plus AOG Since MJD 53985.53 the rate correction obtained by means of the AOG is: frequency correction: -4.4975 x E-14 drift correction: +3.57 x E-16/d. Since MJD 53991.60 the rate correction obtained by means of the AOG is: frequency correction: -3.2022 x E-14 drift correction: +5.79 x E-16/d. IT MC is hydrogen maser 401102 plus AOG. Since MJD 54025.58 the rate correction obtained by means of the AOG is: frequency correction: -1.5455 x E-14, drift correction: +5.17 x E-16/d Note 1: Since MJD 54045.41 the rate correction obtained by means of the AOG is: frequency correction: -1.5115 x E-14 Note 2: Since MJD 54056.67 the rate correction obtained by means of the AOG is: frequency correction: -1.2970 x E-14 drift correction: +4.76 x E-16/d IT MC was hydrogen maser 1401102 plus AOG up to MJD 54090.45, afterwards we switched to cesium 1352118 plus an external microstepper. Since MJD 54088.45 the rate correction obtained by means of the AOG is: frequency correction: +1.9904 x E-14, drift correction: +6.17 x E-16/d. An anomalous frequency behaviour resulting in a -4.5 x E-14 frequency change after MJD 54088.5 was observed on H maser 1401102 that forced to a change of master clock. Since MJD 54090.45 the frequency correction applied on cesium 1352118 (IT MC)is: +170 x E-15. On MJD 54090.71 a time step of +754 ns occurred on H maser 1401102. Change of master clock on MJD 54090.56. IT MC was cesium 1352118 plus an external microstepper up to MJD 54102.44. From MJD 54102.44 to MJD 54104.63 we switched to H maser 401102 plus AOG. From MJD 54104.63 we switched to H maser 1401101 plus AOG. From MJD 54102.44 to MJD 54104.63 the rate correction obtained by means of the AOG is: frequency correction: +0.29159 x E -14 drift correction: +6.17 x E -16/d From MJD 54104.63 to MJD 54109.67 the rate correction obtained by means of the AOG is: frequency correction: +184.000 x E -14 drift correction: +4.02 x E -15/d From MJD 54109.67 to MJD 54116.65 the rate correction obtained by means of the AOG is: frequency correction: +181.000 x E -14 drift correction: +4.02 x E -15/d From MJD 54116.65 to MJD 54122.36 the rate correction obtained by means of the AOG is: frequency correction: +180.695 x E -14 drift correction: +3.07 x E -15/d From MJD 54122.36 to MJD 54129.65 the rate correction obtained by means of the AOG is: frequency correction: +178.000 x E -14 drift correction: +2.00 x E -15/d Since MJD 54129.65 the rate correction obtained by means of the AOG is: frequency correction: +174.000 x E -14 drift correction: -2.00 x E -15/d IT MC is hydrogen maser 401102 plus AOG Note 1: Since MJD 54195.38 the rate correction obtained by means of the AOG is: frequency correction: +4.6 x E-14 drift correction: +0.7 x E-15/d Note 2: Since MJD 54208.51 the rate correction obtained by means of the AOG is: frequency correction: +6.51 x E-14 drift correction: +0.7 x E-15/d IT MC is hydrogen maser 401102 plus AOG. IT MC is hydrogen maser 401102 plus AOG Note: Since MJD 54277.56 the rate correction obtained by means of the AOG is: frequency correction: +9.8 x E-14 drift correction: +5.6 x E-16/d IT MC is hydrogen maser 401102 plus AOG Note: Since MJD 54301.42 the rate correction obtained by means of the AOG is:frequency correction: +10.59 x E-14 drift correction: +5.3 x E-16/d IT MC is hydrogen maser 401102 plus AOG Note: Since MJD 54349.61 the rate correction obtained by means of the AOG is: frequency correction: +13.65 x E-14 drift correction: +5.3 x E-16/d IT MC is hydrogen maser 401102 plus AOG Note1: Since MJD 54382.61 the rate correction obtained by means of the AOG is: frequency correction: +15.45 x E-14 drift correction: +5.4 x E-16/d Note2: Since MJD 54396.60 the rate correction obtained by means of the AOG is: frequency correction: +17.10 x E-14 drift correction: +6.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG IT MC is hydrogen maser 401102 plus AOG. Since MJD 54453.61 the rate correction obtained by means of the AOG is:frequency correction: +19.70 x E-14 drift correction: +6.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG Since MJD 54469.41 the rate correction obtained by means of the AOG is:frequency correction: +19.70 x E-14 drift correction: +4.1 x E-16/d IT MC is hydrogen maser 401102 plus AOG IT MC is hydrogen maser 401102 plus AOG Since MJD 54543.64 the rate correction obtained by means of the AOG is: frequency correction: +22.1 x E-14 drift correction: +3.2 x E-16/d IT MC is hydrogen maser 401102 plus AOG. Since MJD 54557.56 the rate correction obtained by means of the AOG is: frequency correction: +23.39 x E-14 drift correction: +4.0 x E-16/d Since MJD 54572.54 the rate correction obtained by means of the AOG is: frequency correction: +24.73 x E-14 drift correction: +4.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG. Note: Since MJD 54728.35 the rate correction obtained by means of the AOG is: frequency correction: +35.8 x E-14 drift correction: +6.9 x E-16/d IT MC is hydrogen maser 401102 plus AOG. Note: Since MJD 54766.40 the rate correction obtained by means of the AOG is: frequency correction: +38.8 x E-14 drift correction: +16.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG Note 1: Since MJD 54830.55 the rate correction obtained by means of the AOG is: frequency correction: +53.4 x E-14 drift correction: +20.0 x E-16/d Note 2: The 1401103 clock is a new hydrogen maser "KVARZ Active hydrogen Maser" mod. CH1-75A s/n 211121 0808 ME34. The clock has been operative since August 2008. MC is hydrogen maser 401102 plus AOG. Since MJD 54878.38 the rate correction obtained by means of the AOG is: frequency correction: +65.3 x E-14 drift correction: +26.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG Note: Since MJD 54920.59 the rate correction obtained by means of the AOG is: frequency correction: +74.6 x E-14 drift correction: +18.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG Note 1: Since MJD 54927.34 the rate correction obtained by means of the AOG is: frequency correction: +77.3 x E-14 drift correction: +22.0 x E-16/d Note 2: Since MJD 54941.43 the rate correction obtained by means of the AOG is: frequency correction: +80.8 x E-14 drift correction: +26.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG Note 1: Since MJD 54966.56 the rate correction obtained by means of the AOG is: frequency correction: +87.55 x E-14 drift correction: +26.0 x E-16/d Note 2: Since MJD 54973.29 the rate correction obtained by means of the AOG is: frequency correction: +89.80 x E-14 drift correction: +26.0 x E-16/d Note 3: On MJD 54960.58 a time step of +5.3 ns occurred on UTC(IT)(UTC(IT) has been delayed by this amount) Note 4: On MJD 54960.58 a time step and a frequency step occurred on the hydrogen maser 401103: time step: +13954 ns (delay) frequency step: -0.8 ns/d 54960.58 1400103 +013954.0 -0000.800 IT 10011 IT MC is hydrogen maser 401102 plus AOG IT MC is hydrogen maser 401102 plus AOG Since MJD 55025.38 the rate correction obtained by means of the AOG is: frequency correction: +102.5 x E-14 drift correction: +25.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG IT MC is hydrogen maser 401102 plus AOG. Since MJD 55077.55 the rate correction obtained by means of the AOG is: frequency correction: +115.7 x E-14 drift correction: +25.0 x E-16/d IT MC is hydrogen maser 401102 plus AOG. Since MJD 55120.62 the rate correction obtained by means of the AOG is: frequency correction: +125.7 x E-14 drift correction: +25.0 x E-16/d in the frame of INRIM contribution to BIPM GPS Precise Point Positioning(PPP) computations of TAI links, on 2009 November 26th (DOY 330 ; MJD 55161), the Active Hydrogen Maser used for the generation of UTC(IT)- the time reference for IENG station has been changed from the previous "Symmetricom Datum HMH 2010" to the current "Kvartz CH1-75A". For mentioned reason, IENG station has been kept switched off since 09.18 UTC to 10.58 UTC and related hourly "k" RINEX file not transmitted to the data centres. Until MJD 55161.45 IT MC is hydrogen maser 401102 plus AOG after MJD 55161.45 IT MC is hydrogen maser 401103 plus AOG Since MJD 55152.46 the rate correction obtained by means of the AOG is: frequency correction: +133.95 x E-14 drift correction: +25.0 x E-16/d Since MJD 55161.45: the rate correction obtained by means of the AOG is: frequency correction: -43.80 x E-14 drift correction: +3.8 x E-16/d On MJD 55161.45 a time step occurred on the hydrogen maser 401103:time step: -23.2ns (advanced) : Change of master clock on MJD 55161. IT MC is hydrogen maser 401103 plus AOG Since MJD 55181.64 the rate correction obtained by means of the AOG is: frequency correction: -43.20 x E-14 drift correction: +2.6 x E-16/d IT MC is hydrogen maser 401103 plus AOG. Since MJD 55210.38 the rate correction obtained by means of the AOG is: frequency correction: -42.46 x E-14 drift correction: +2.3 x E-16/d IT MC is hydrogen maser 401103 plus AOG Since MJD 55244.47 the rate correction obtained by means of the AOG is: frequency correction: -40.60 x E-14 drift correction: +3.7 x E-16/d. From MJD 55253.35 IT MC is hydrogen maser 401101 plus AOG the rate correction obtained by means of the AOG is: frequency correction: +46.84 x E-14 drift correction: +1.87 x E-15/d IT MC is hydrogen maser 401101 plus AOG. Since MJD 55270.37 the rate correction obtained by means of the AOG is: frequency correction: +48.82 x E-14 drift correction: +1.7 x E-15/d IT MC is hydrogen maser 401101 plus AOG Since MJD 55328.63 the rate correction obtained by means of the AOG is: frequency correction: +60.74 x E-14 drift correction: +2.0 x E -15/d On MJD 55329.40 a time step occurred on the hydrogen maser 401102: time step: -072440.0 ns (advanced) On MJD 55329.40 a frequency step occurred on the hydrogen maser 401102: frequency step: -156.0 ns/d (+180.6 x E-14) IT MC is hydrogen maser 401101 plus AOG Since MJD 55361.50 the rate correction obtained by means of the AOG is: frequency correction: +67.30 x E-14 drift correction: +2.0 x E-15/d IT MC is hydrogen maser 401101 plus AOG Note: Since MJD 55390.39 the rate correction obtained by means of the AOG is: frequency correction: +73.50 x E-14, drift correction: +2.1 x E-15/d IT MC is hydrogen maser 401101 plus AOG Note: Since MJD 55449.52 the rate correction obtained by means of the AOG is: frequency correction: +86.51 x E-14 drift correction: +2.2 x E-15/d IT MC is hydrogen maser 401101 plus AOG. Since MJD 55481.35 the rate correction obtained by means of the AOG is: frequency correction: + 93.11 x E-14 drift correction: +2.1 x E-15/d IT MC is hydrogen maser 401101 plus AOG. Since MJD 55511.48 the rate correction obtained by means of the AOG is: frequency correction: + 99.96 x E-14 drift correction: + 2.3 x E-15/d IT MC is hydrogen maser 401101 plus AOG Note: Since MJD 55540.58 the rate correction obtained by means of the AOG is: frequency correction: + 106.32 x E-14, drift correction: + 2.2 x E-15/d IT MC is hydrogen maser 401101 plus AOG Since MJD 55631.63, the rate correction obtained by means of the AOG is: frequency correction: +127.32 x E-14 drift correction: + 2.3 x E-15/d IT MC is hydrogen maser 401101 plus AOG Since MJD 55684.35 the rate correction obtained by means of the AOG is: frequency correction: -10.43 x E-14 drift correction: +2.3 x E-15/d Since MJD 55693.39 the rate correction obtained by means of the AOG is: frequency correction: -8.39 x E-14 drift correction: +2.3 x E-15/d On MJD 55684.33 a frequency step occurred on the hydrogen maser 401101: frequency step: +129.6 ns/d (+150 x E-14) 55684.33 1401101 +000000.0 +0129.600 IT MC is hydrogen maser 401101 plus AOG Since MJD 55722.38 the rate correction obtained by means of the AOG is: frequency correction: -1.54 x E-14 drift correction: +2.35 x E-15/d IT MC is hydrogen maser 401101 plus AOG Since MJD 55846.60 the rate correction obtained by means of the AOG is: frequency correction: +28.38 x E-14 drift correction: +2.4 x E-16/d IT MC is hydrogen maser 401101 plus AOG Since MJD 55907.41the rate correction obtained by means of the AOG is: frequency correction: +42.72 x E-14 drift correction: +2.42 X E-15/d IT MC is hydrogen maser 401101 plus AOG. Since MJD 55967.44 the rate correction obtained by means of the AOG is: frequency correction: +55.70 x E-14 drift correction: +2.24 x E-15/d Since MJD 55984.38 the rate correction obtained by means of the AOG is: frequency correction: +60.30 x E-14 drift correction: +2.24 x E-15/d IT MC is Hydrogen Maser 401101 plus AOG Since MJD 55998.38 the rate correction obtained by means of the AOG is: frequency correction: +63.08 x E-14 drift correction: +2.38 E-15/d Since MJD 56013.42 the rate correction obtained by means of the AOG is: frequency correction: +67.25 x E-14 drift correction: +2.38 E-15/d IT MC is Hydrogen Maser 401101 plus AOG Since MJD 56029.37 the rate correction obtained by means of the AOG is: frequency correction: +71.52 x E-14 drift correction: +2.33 E-15/d Change of master clock on MJD 56068.4. IT MC is Hydrogen Maser 401103 plus AOG Since MJD 56140.50 the rate correction obtained by means of the AOG is: frequency correction: -4.71 x E-14 drift correction: +0.61 E-15/d Since MJD 56153.50 the rate correction obtained by means of the AOG is: frequency correction: -3.53 x E-14 drift correction: +0.60 E-15/d Since MJD 56161.59 the rate correction obtained by means of the AOG is: frequency correction: -2.15 x E-14 drift correction: +0.60 E-15/d IT MC is Hydrogen Maser 401103 plus AOG Since MJD 56273.42 the rate correction obtained by means of the AOG is: frequency correction: +6.25 x E-14 drift correction: +0.64 E-15/d Since MJD 56289.40 the rate correction obtained by means of the AOG is: frequency correction: +7.00 x E-14 drift correction: +0.64 E-15/d IT MC is Hydrogen Maser 401103 plus AOG Since MJD 56362.35 the rate correction obtained by means of the AOG is: frequency correction: +11.10 x E-14 drift correction: +0.56 E-15/d IT MC is Hydrogen Maser 401103 plus AOG Since MJD 56393.52 the rate correction obtained by means of the AOG is: frequency correction: +12.87 x E-14 drift correction: +0.57 E-15/d IFAG. Frequency step of UTC(IFAG) of +10.0 ns/d on MJD = 50850.75 Time step of UTC-UTC(IFAG) of -50 ns on MJD = 51653.54 Change of master clock on MJD = 52099. Change of master clock on MJD = 52729.5 a timestep of +50ns/d to the H-Maser with the S/N 1404401. at MJD 53022.4 e have taken out the H-Maser EFOS 01 (SN:1404401) out of service. e introduced a correction to our Masterclock of - 2,8 mikroseconds and a small requency offset of -1,25ns/d via the phasemicrostepper on MJD 53299 at 10:00UT Time step of UTC(IFAG) of - 2800 ns on MJD 53299. We introduced a step to our Master clock SN 1798 of 500ns. The H-Maser EFOS 1 and 13 have been taken out of service due to maintenance. Apparent time step of [UTC-UTC(IFAG)] of -500 ns on MJD 53919.5. Clock sn 1361732 failed on MJD 53965. Change of master clock on MJD 54197. IGNA. Time step of UTC(IGMA) of +200 ns on MJD = 51178.9 Apparent time step of UTC-UTC(IGMA) between MJD = 52329 and MJD = 52334. Frequency steps of UTC(IGMA) in ns/d : MJD Freq. step 50959.00 -0.969 51222.00 -3.508 51312.00 -2.000 51402.00 +2.286 51544.00 +1.53 51722.00 +1.125 52072.00 -2.00 52137.00 -3.00 52212.00 +1.969 Change of Auxiliar Comparison Clock at DJM 53157.0. Step in the readings of clocks +355 ns. The UTC IGMA is not changed. Time step of UTC(IGMA) of about -210 ns between MJD 53214 and 53219 due to change of receiver. The GPS data file GMBP0H_843 was corrected with micro stepperwhich changed from 17889 to 15889 x 10 to the power of -17 and there were some power cut in file GMBP0H_850. Listed values are [UTC-UTC(IGMA)] + 0.21 ms. Instituto Geográfico National, formerly IGMA. Apparent time step of UTC(IGNA) of about +11100 ns on MJD 56387. INPL. Time step of UTC(INPL) of about - 620 ns on MJD = 51279.59 Apparent time step of UTC-UTC(INPL) of about + 100 ns between MJD = 51349 and MJD = 51354 . Frequency steps of UTC(INPL) in ns/d : MJD Freq. step 50986.15 -6.05 50993.42 -2.59 Time step of UTC(INPL) of -12350 ns on MJD 53423.3. We have introduced the additional steering to the output frequency of our Cs-standard equal to -77E-15 to reduce the clock rate.This steering was introduced on 17 May 2005 (MJD 53507) at the tracking time 06hh00mm UTC. Time step of UTC(INPL) of -1100 ns on MJD 53633.3. Time step of UTC(INPL) of 450 ns on MJD 53772.6 due to master clock change. Time step of UTC(INPL) of +300 ns on MJD 54164.3 The new corrected values for antenna coordinates and REF Delay were introduced to our time transfer system TTS4 S/N0106 on 03.05.11 (MJD 55684) at 07h34m (UTC time). : Apparent time step of UTC(INPL) of about -50 ns on MJD 55755.0. Correction of our local time scale UTC(INPL) by -500 ns on 13.03.12 MJD 55999 at 10h58m UTC. Our second Cs-clock S/NUS48352481 was synchronized to our master clock S/NUS48352480 on 26.03.2012 (MJD 56012) at 14h38m UTC. This synchronization changed the time scale of Cs-clock S/N US48352481 by +86 ns. : Time step of UTC(INPL) of -500 ns on MJD 55999.46. Apparent time step of UTC(INPL) of about -23 ns between MJD 56114 and MJD 56119. The power supply system of INPL was repaired and tested on 14.08.12 - 22.08.12. This caused the failure of atomic clock supply system. IPQ . Time step of UTC(IPQ) of + 1100 ns on MJD = 50847.76 Apparent time step of UTC-UTC(IPQ) of - 22 ns on MJD = 51036.44 due to calibration of a cable delay. : Instituto Portugues da Qualidade, Caparica, Portugal. Due to a power short circuit yesterday (MJD 55308) at around 15 UTC in the Laboratory, all the equipment was shutdown. As soon as possible we start again a new scale. : Time step of UTC(IPQ) of +15 ns on MJD 55494.2. On MJD 55571,4388 steering of UTC(IPQ) of 2.025E-7 On MJD 55608,467940 IPQ begun a 10 MHz frequency steering of -7.7160994E-14 Hz After repaired TTS4 receiver is working. We changed the coordinates of antenna and delays. At MJD 55622.44 I have stopped the steering. Today MJD 55631.65 I begun a 10 MHz frequency steering of -7.7160494E-14 Hz. At MJD 55634.54 I have stopped the steering of -7.7160494E-14 Hz. Today MJD 55634.55 I begun a 10 MHz frequency steering of -3.4722222E-13. Due to a malfunction on equipment, we made on MJD 555645,534 a time step of 200 ns in all our clocks : Time step of UTC(IPQ) of +200 ns on MJD 55645.53. On MJD 55657.54 I stop a 10 MHz frequency steering of -5.50154E-13 Hz. On MJD 55664.41 I begun a 10 MHz frequency steering of -1.041666E-13 Hz. On MJD 55669.39 I stopped a 10 MHz frequency steering of -1.041666E-13 Hz. On MJD 55669.63 I begun a 10 MHz frequency steering of -4.6296295E-14 Hz. On MJD 55677.39 I stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. On MJD 55680.63 I begun a 10 MHz frequency steering of -2.6041666E-14 Hz. On MJD 55683.47 I stopped a 10 MHz frequency steering of -2.6041666E-14 Hz. On MJD 55683.47 I begun a 10 MHz frequency steering of -4,1666665E-14 Hz. On MJD 55697.433 I stopped a 10 MHz frequency steering of -4,1666665E-14 Hz. At MJD 55697.435 I begun a 10 MHz frequency steering of +4,166665E-14 Hz. On MJD 55700,581 I stopped a 10 MHz frequency steering of +4,166665E-14 Hz. At MJD 55701.415 I begun a 10 MHz frequency steering of -2,4884259E-14 Hz. On MJD 55705,630 I stopped a 10 MHz frequency steering of -2,4884259E-14 Hz. At MJD 55706,594 I begun a 10 MHz frequency steering of +1,1574074E-14 Hz. On MJD 55707,407 I stopped a 10 MHz frequency steering of +1,1574074E-14 Hz. At MJD 55707,409 I begun a 10 MHz frequency steering of +2.314814E-14 Hz. On MJD 55707,513 I stopped a 10 MHz frequency steering of +2.314814E-14 Hz. At MJD 55707,513 I start a 10 MHz frequency steering of -3.0092592E-14 Hz. At MJD 55712,416 I stop a 10 MHz frequency steering of -3.0092592E-14 Hz and start a 10 MHz steering of -4,9768517E-14 Hz. At MJD 55712,416 I stop a 10 MHz frequency steering of -3.0092592E-14 Hz and start a 10 MHz steering of -4,9768517E-14 Hz. On MJD 55718,417 I stopped a 10 MHz frequency steering of -4,9768517E-14 Hz. At MJD 55718,417 I start a 10 MHz frequency steering of -8.4876541E-14 Hz. On MJD 55719,482 I stopped a 10 MHz frequency steering of -8.4876541E-14 Hz. On MJD 55719,83 I start a 10 MHz frequency steering  of -4.6296295E-14 Hz. On MJD 55723,305 I stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55727,632 I start a 10 MHz frequency steering of -1.6354166E-14 Hz. On MJD 55728.37 I stop a 10 MHz frequency steering of -1.6354166E-14 Hz and start a 10 MHz frequency steering of -4.6296295e-14. On MJD 55738.375 stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55740,295 I start a 10 MHz frequency steering of -4.6296295E-14. On MJD 55748.867 stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. On MJD 55759.324 stopped a 10 MHz frequency steering I start a 10 MHz frequency steering  of -4.6296295E-14. On MJD 55762.312 stopped a 10 MHz frequency steering of -4.6296295E-14. At MJD 55762,313 I start a 10 MHz frequency steering of -1.8865740E-14. At MJD 55771.623 stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55775.392 I start a 10 MHz frequency steering of -3.47222216E-14 Hz. At MJD 55784.731 I stopped a 10 MHz frequency steering of -4.6296295E-14 Hz. At MJD 55785.639 I start a 10 MHz frequency steering  of -4.0509258E-14 Hz. At MJD 55786.678 I stop and start a 10 MHz frequency steering of -4.6296295 E-14 At MJD 55788.856 I stop the 10 MHz frequency steering. At MJD 55790.85 I start a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55797,42 I stop At MJD 55799.935 I start a 10 MHz frequency steering of -4.4296295E-14Hz. At MJD 55800.327 stop and start a steering of 4.4296295E-14Hz. At MJD 55804.399 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55805.303 I start a steering of -4.6296295E-14Hz. At MJD 55806.627 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55808.344 I start a steering of -4.6296295E-14Hz. At MJD 55810.325 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55811.613 I start a steering of -4.6296295E-14Hz. At MJD 55816.598 I stop a 10 MHz frequency steering of -4.2245369E-14Hz. At MJD 55821.312 I start a steering of -4.6296295E-14Hz. At MJD 55825.318 I stop a 10 MHz frequency steering of -4.6296295E-14Hz. At MJD 55825.319 I start a steering of -9.2592590E-14Hz. At MJD 55829.407 I stop a 10 MHz frequency steering of -9.2592590E-14Hz. At MJD 55829.408 I start a steering of -4.6296295E-14Hz. AT MJD 55839.661 I stop a 10 MHz frequency steering of  -9.2592590E-14Hz and At 55840.338  stop a 10 MHz frequency steering of   9.2592590E-14Hz and I start a 10 MHz frequency steering of -1.1574074E-13Hz AT MJD 55854.328 I stop a 10 MHz steering of 6.9444442E-14 Hz and I start 10 MHz steering of -6.9444442E-14 Hz At MJD 55911.378 stop a 10 MHz steering of -3.4722221e-14 Hz and start  a steering of -9.2592590e-14 Hz At MJD 55916.382 stop a 10 MHz steering of -9.2592590e-14 Hz and start  a steering of -6.9444442e-14 Hz At MJD 55917.356 stop a 10 MHz steering of -6.9444442e-14 Hz and start  a steering of 9.2592590e-14 Hz At MJD 55919.362 stop a 10 MHz steering of 9.2592590e-14 Hz At MJD 55919.729 start a 10 MHz steering of 9.2592590e-14 Hz At MJD 55920.389 stop a 10 MHz steering of 9.2592590e-14 Hz and start a steering of -9.2592590e-14 Hz At MJD 55922.806 stop a 10 MHz steering of -9.2592590e-14 Hz AT MJD 55923,365 start a 10 MHz steering of -6.9444442e-14 Hz At MJD 55936,882 stop a 10 MHz steering of 1,04166666e-13 Hz. At MJD 55938,381 start a 10 MHz steering of -6.9444442e-14 Hz At MJD 55939,381 stop and start a 10 MHz steering of -9.2592590e-14. At MJD 55942,572 stop  a 10 MHz steering of -9.2592590e-14. At MJD 55943,656 start a 10 MHz steering of 6.9444442e-14 Hz. At MJD 55945,355 stop a 10 MHz steering of 6.9444442e-14 Hz and start a 10 MHz steering of -9.2592590e-14Hz. At MJD 55946,447 stop a 10 MHz steering of -9.2592590e-14 Hz and start a 10 MHz steering -1.0416666e-13Hz. At  MJD 55948,808 stop a 10 MHz steering of -1.0416666e-13Hz. At MJD 55949,664 start a 10 MHz steering of 9.2592590e-14Hz At MJD 55950.336 stop and start a 10 MHz steering of 9.2592590e-14Hz At MJD 55950.340  and start a 10 MHz steering of -6.9444442e-14Hz At MJD 55952.359  stop a 10 MHz steering -6.9444442e-14Hz and start a 10 MHz steering of -8.6805553e-14Hz At MJD 55955.653 stop a 10 MHz steering -8.6805553e-14Hz. : Time step of UTC(IPQ) of about -2100 ns on MJD 55932.355. At MJD 55971.779 start a 10 MHz steering -6.9444442e-14Hz At MJD 55972.373 start a 10 MHz steering -8.6805553e-14Hz At MJD 55974.816 stop a 10 MHz steering At MJD 55977.380 start a 10 MHz steering -9.259259e-14Hz At MJD 55980.348 start a 10 MHz steering -2.3148147e-14Hz At MJD 55982.785 stop a 10 MHz steering of -2.3148147e-14Hz At MJD 55990.370 start a 10 Mhz steering of -4.6296295e-14Hz At MJD 55995.372 stop a 10 Mhz steering of -4.6296295e-14Hz At MJD 55996.732 start a 10 Mhz steering of 6.9444442e-14Hz At MJD 55998.505 start a 10 Mhz steering of -4.6296295e-14Hz A tMJD 55999.352  start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56007.363 stop a 10 Mhz steering of -6.9444442e-14Hz At MJD 56008.355 start a 10 Mhz steering of -4.6296295e-14Hz At MJD 56009.351 start a 10 Mhz steering of -5.7870369e-14Hz At MJD 56010.373  start a 10 Mhz steering of -9.259259e-14Hz At MJD 56013.420 stop a 10 Mhz steering of -9.259259e-14Hz At MJD 56014.624 start a 10 Mhz steering of -5.3935184e-14Hz At MJD 56016.321 start a 10 Mhz steering of -9.259259e-14Hz At MJD 56018,333  start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56021.769 start a 10 Mhz steering of -9.259259e-14Hz At MJD 56022.306 stop a 10 Mhz steering of -9.259259e-14Hz At MJD 56024.485 start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56029.338 start a 10 Mhz steering of --4.6296295e-14Hz AT MJD 56029.797 stop a 10 Mhz steering of -6.9444442e-14Hz At MJD 56030.336 start a 10 Mhz steering of 6.9444442e-14Hz At MJD 56030.339 start a 10 Mhz steering of 6.9444442E-14Hz At MJD 56032.345 stop a 10 Mhz steering of 6.9444442E-14Hz At MJD 56032.351 start a 10 Mhz steering of -9.259259E-14Hz At MJD 56035.648 start a 10 Mhz steering of -2.3418147E-14Hz At MJD 56036.310 start a 10 Mhz steering of -1.975925E-15Hz At MJD 56036.644 start a 10 Mhz steering of -1.9675925E-13Hz At MJD 56037.795 start a 10 Mhz steering of -9.2592590E-14Hz At MJD 56040.300 start a 10 Mhz steering of -6.9444442E-14Hz At MJD 56042.753 start a 10 Mhz steering of -4.6296295E-14Hz At MJD 56043.318 stop a 10 Mhz steering of -4.6296295E-14Hz At MJD 56045.382 start a 10 Mhz steering of - 4.6296295E-14Hz At MJD 56046.314 start a 10 Mhz steering of  -9.259259E-14Hz At MJD 56050.312 strat a 10 Mhz steering of  -2.3148147E-13Hz At MJD 56050.839 start a 10 Mhz steering of -9.259259E-14Hz At MJD 56051.401 start a 10 Mhz steering of -4.6296295E-14Hz At MJD 56052.327 start a 10 Mhz steering of  4.6296295E-14Hz At MJD 56054.331 start a 10 Mhz steering of -9.259259E-14Hz At MJD 56057.310 start a 10 Mhz steering of -6.9444442e-14Hz At MJD 56059.321 start a 10 Mhz sterring of -9.259259e-14Hz At MJD 56060.329 start a 10 Mhz sterring of -2.3148147e-14Hz At MJD 56068.612 start a 10 Mhz sterring of -6.9444442e-14Hz At MJD 56077.899 start a 10 MHz sterring of -6.9444442e-14Hz At MJD 56083.316 start a 10 MHz sterring of --8.1018516e-14Hz At MJD 56084.649 start a 10 MHz sterring of -5.7870369e-14Hz MJD 56086.556 start a 10 MHz steering of -- 9.2592590E-14 Hz MJD 56094.314 start a 10 MHz steering of – 5.7870269E-14 Hz MJD 56095.306 start a 10 MHz steering of – 9.2592590E-14 Hz MJD 56104.330 start a 10 MHz steering of – 6.9444442E-14 Hz MJD 56109.385 start a 10 MHz steering of – 9.2592590E-14 Hz MJD 56118.322 start a 10 MHz steering of –5.7870369E-14Hz MJD 56122.329 start a 10 MHz steering of –8.1018516E-14 Hz MJD 56128.312 start a 10 MHz steering of –9.2592590E-14 Hz MJD 56131.304 start a 10 MHz steering of –1.1574074E-13 Hz MJD 56134.333 start a 10 MHz steering of –9.2592590E-14 Hz MJD 56139.399 start a 10 MHz steering of –6.9444440E-14Hz MJD 56147.309 stop a 10 MHz steering MJD 56149.305 start a 10 MHz steering of –6.9444440E-14 Hz MJD 56151.304 start a 10 MHz steering of –9.2592590E-14 Hz MJD 56154.361 start a 10 MHz steering of –1.1574074E-13 Hz MJD 56157.645 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56166.341 start a 10 MHz steering of –9.2592590 E-14 Hz MJD 56171.300 start a 10 MHz steering of –1.5046296 E-14 Hz MJD 56172.320 start a 10 MHz steering of –2.6620370 E-13 Hz MJD 56173.317 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56176.585 stop a 10 MHz steering of -6.9444442 E-14 Hz MJD 56177.329 start a 10 MHz steering of - 5.7870369 E-14 Hz MJD 56178.314 start a 10 MHz steering of - 9.2592590 E-14 Hz MJD 56181.312 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56183.339 start a 10 MHz steering of – 4.6296295 E-14 Hz MJD 56185.329 start a 10 MHz steering of – 6.9444442 E-14 Hz MJD 56187.345 start a 10 MHz steering of –1.6203703 E-13 Hz MJD 56200.358 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56206.330 start a 10 MHz steering of –1.1340074 E-13 Hz MJD 56209.639 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56214.412 start a 10 MHz steering of –4.6296295 E-14 Hz MJD 56218.304 start a 10 MHz steering of –5.7370369 E-14 Hz MJD 56220.308 start a 10 MHz steering of –1.1574074 E-13 Hz MJD 56224.309 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56225.490 stop MJD 56226.302 start a 10 MHz steering of –4.6296295 E-14 Hz MJD 56227.327 start a 10 MHz steering of –6.9444442 E-14 Hz MJD 56230.367 start a 10 MHz steering of –9.2592590 E-14 Hz JATC. Apparent time step of UTC-UTC(JATC) between MJD = 51054 and MJD = 51059. Time step of UTC(JATC) of + 2707 ns between MJD = 51174 and MJD = 51179. Time step of UTC(JATC) of -9785.4 ns on MJD 53614. JV . Change of master clock on MJD = 52854, new clock is 1361277 Our clock no.1512040 has an error that occured after MJD54029, due to this problem we have taken clock no.1512040 out of our measurement-system from MJD54034 until we have this clock repaired. Some problems with measuring UTC(JV) in June. We had problems with clock 1210216, which is UTC(JV), and also with the timer/counter that do the measurements. This problem happen during week 25. Therefore the clock data for June 2009, contain only data for MJD 54984 and 54989. The clock 1210216 is now operating as normal again and the timer/counter has been replaced with another one. So now everything is back to normal. This has introduced a time step in UTC(JV). : Apparent time step of UTC(JV) of about 18900 ns between MJD 55009 and 55014. : Time step of UTC(JV) of 7644.7ns on MJD 55179.26. On the basis of the problems we have had with the clock with ID no. 1210216 and the fact that our clock with ID no. 1361277 is more stable,we whish to change the UTC(JV) to clock no. 1361277 from March 2010.So, we will report clock no. 1361277 as UTC(JV) for the report in April 2010. This will introduce a step in UTC(JV), and a change in drift rate for UTC(JV). : Time step of UTC(JV) of about +40500 ns between MJD 55254 and 55259 due to change of master clock. We have implemented a new micro phase stepper as UTC(JV) (SpectraDynamics HROG-10), Whereas we previously reported a free-running cesium clock : Time step of UTC(JV) of -45023.5 ns on MJD 55773.0. Time step of UTC(JV) of +73.6 ns on MJD 56078.00 due to change of master clock. KEBS. : Kenya Bureau of Standards, Nairobi, Kenya. Apparent time step of UTC(KEBS) of about -7.1 µs on MJD 56071. Apparent time step of UTC(KEBS) of about +14000 ns near MJD 56229.2. Apparent time step of UTC(KEBS) of about +1657 ns on MJD 56303.54. KIM . Research Centre for Calibration, Instrumentation and Metrology - The Indonesian Institute Time step of UTC(KIM) of -120 ns on MJD 54517.0. KRIS. Frequency step of UTC(KRIS) in ns/d MJD Freq. step 50933.0 +0.864 51086.0 +0.864 51361.0 +0.864 51541.0 -0.864 52426.0 +5.184 Change of master clock on MJD = 52912 After MJD53454 one Cs clock (1360321) is dropped for maintenance. Erratum, corrected uncertainty values for Circular T 261: uB/ns u/ns KRIS: 5.0 5.1 KZ . : Apparent time step of [UTC-UTC(KZ)] of about 1000 ns between MJD 54964 and 54969. We changed cut-off angle (elevation) of our receiver's antenna from 5 to 10 degrees between MJD 55105. But from MJD 55115 it was changed to 5 degrees again. And now cut-off angle of antenna is 5 degrees. It was a time step -2400 ns on MJD 55208. : Time step of UTC(KZ) of -2400 ns on MJD 55208.0. : Time step of UTC(KZ) of -1000 ns on MJD 55461. Time step of UTC(KZ) of -1000 ns on MJD 56090.31. LDS . Apparent time step of UTC-UTC(LDS) between MJD = 52139 and MJD = 52144. Apparent time step of [UTC-UTC(LDS)] of about -5400 ns on MJD 53969.3. LT . Lithuanian National Metrology Institute, Vilnius, Lithuania. Apparent time step of -23 ns of [UTC-UTC(LT)] due to change of the GPS time receiver internal delay on MJD 52439.41 (Rapport BIPM-2002/10) Apparent time step of [UTC - UTC(LT)] of +10000 ns between MJD 52859 and 52864 due to GPS receiver failure. Apparent time step of [UTC - UTC(LT)] of -10000 ns between MJD 52884 and 52889 due to GPS receiver failure. The following correction was done on MJD 53502,38: Inserted time step of UTC(LT) of 750 ns (on MJD 53502,38); Frequency offset of clock (LT) was changed from 120E-15 to 98E-15 (on MJD 53502,38). Time step of UTC(LT) of 750 ns on MJD 53502. Frequency offset of clock (LT) was changed from +95E-15 to -215E-15 (on MJD 53657,52). Time step of UTC(LT) of 2600 ns on MJD 53751.6. On MJD 53846,6 the Frequency offset of LT clock was changed from 152E-15 to 162E-15. : Time step of UTC(LT) of +1200 ns on MJD 55494.0. on MJD 55506 UTC 11:48:00 the frequency offset equal to 215E-15 was inserted to the LT master clock. Since  MJD 55506 UTC 11:48:00 the FreqOffset = 215E-15 for LT clock. In MJD 55632,01 UTC(BY)scale on a 100 ns correction is done. LV . SA Latvian National Metrology Centre, Riga. Time step of UTC(LV)on MJD 54420 due to master clock change. On MJD 54479, UTC: 13-22-00 till 14-42-00, we changed some coaxial connections, therefore: Data aquistution was interrupted in this time period. The parameter REF DLY was changed from 38 nS to 10,00 nS : Time activities are suspended for an undetermined period. MSL . Change of master clock between MJD = 51984 and MJD = 51989. Time step of UTC(MSL) of -1300 ns on MJD = 52129.99 Frequency step of UTC(MSL) of +10.368 ns/d on MJD = 52424.04 Due to a power spike on MJD 53069 at around 00:30 UTC Cs274 stopped and automatically restarted. This resulted in a change in both the time of UTC(MSL) and in the rate of the clock. s1025 has now been returned to the active clocks. The previous high stability tube has een replaced with a standard tube.The new tube has a significant frequency offset from UTC nd a frequency offset of -703E-15 has been applied to the clock. lease note: Cs1025 still has a frequency offset of -703E-15 but the rate appears o have changed in the last few days.This is not due to any change in the frequency offset. The air-conditioning in the clock room failed on MJD 53324 and was not repaired until MJD 53326. The frequency offset of Cs1025 was changed to -1406E-15 at 0.0 UTC on MJD 53319 A power failure occurred at 1105UTC on MJD 53519 and data collection resumed around 2300UTC on MJD 53520. Cs1025 lost lock on MJD 53661 at around 2000 hours UTC. After restarting the clock a -16.4ns step was introduced into the time of the clock. MIKE. Centre for Metrology and Acrreditation, Finland. Our Master Clock, 1404180, Active Hydrogen Maser, has been advanced by 4850,0 ns at MJD 53492. The reason was negative frequency error causing phase to drift to "wrong side". Our 5071A HS Cs2-clock, 1351171, will die quite soon. Its noise has increased since 1th of april 2005 and now warning signal its blinking. It will be serviced within two months. We have advanced it by 10900,0 ns at MJD 53499 due to measurement system to avoid negative start stop readings. Time step of UTC(MIKE) of -4850 ns on MJD 53492. We announce our main clock is changed this morning due to a yet unknown MC failure. Previous failing MC was 1404180, The new MC from now on is 1404108 1404180 failed 31.03.2008, MJD 54556 15:12:38 UTC. The last measured GPS Common view track with the failing MC was 54556 145400. After the MC change the first measured GPS Common View track with the new MC 1404108 is 54557 081000. Because of the fact that the MC failure occurred at the time of file change, the new file, MIKE0804.gps has the correct header information, MC number and revision date changed. Change of master clock on MJD 54557. Due to cabling and microstepper renewing GPS Common Viev Results have jumped significantly 11..12 August, MJD 55054..55055. All common view results during those days should be deleted. UTC-UTC(MIKE is advanced roughly 200 ns. The new GPS CV receiver, GTR50 will be placed into "service" in september 2009. : Time step of UTC(MIKE) of -366 ns between MJD 55054. Stepper rate adjusted -0.45 ns/d on MJD 55110.50 : Time step of UTC(MIKE) of about 169.7 ns on MJD 55105.5 due to change of receiver. MKEH. Hungarian Trade Licensing Office, formerly OMH. On MJD 56314.54 we had implement a time step -80000 ns. Time step of UTC(MKEH) of -80000 ns on MJD 56314.54. MTC . MAKKAH Time Centre - King Abdulah Centre for Crescent Observations and Astronomy, Makkah, Saudi Arabia. NAO . Apparent time step of UTC-UTC(NAO) of + 400 ns between MJD = 50914 and MJD = 50919. Apparent time steps of UTC-UTC(NAO) between MJD = 51394 and MJD = 51399 and between MJD = 51399 and MJD = 51404. Apparent time step of UTC-UTC(NAO) of - 437 ns on MJD = 51534.05 Change of master clock and time step of UTC(NAO) of +30 ns on MJD = 52255.08 Master clock was changed to NAO-6(35 0779) from NAO-9(35 1689) at 09h00mUTC on 05 December(MJD= 52978) 2003. Time step of UTC(NAO) of 50 ns(retard) was occurred by it. The UTC(NAO) frequency rate of 2.5 ns/day was adjusted at the rate of 2.9*^-14 for advance direction 01h40mUTC on DEC.18(MJD=52991) 2003. Time step of UTC(NAO) of -50 ns on MJD = 52978.38 due to change of master clock. AO-8(35 1206) was stopped because of change(beam tubu) t 00h11mUTC on 11 September(MJD=53259) 2004. The UTC(NAO) frequency rate of about 1.0ns/day was adjusted at the rate of 1.2*^-14 for advance direction 07h05m(UTC) on JULY.14(MJD=53565) 2005. NAO-9(35 1689) was stopped because of change(beam tube) at 00:25 on 29 August (MJD = 53611) 2005. We restarted NAO-9(35 1689 ; new beam tube) on 13 September(MJD= 53626) 2005. NAO-9(35 1689) was stopped because of trouble on 3 November 2005. The UTC(NAO) frequency rate of 1.5ns/day was adjusted at the rate of 1.74*^-14 for advance direction 01h50m(UTC) on JAN.27 (MJD=53762.5) 2006. The master clock of NAO (Mizusawa) is now 1351689 (BIPM clock number). Change of master clock on MJD 53982. Our clock 1351206 (BIPM clock number) had been resynchronized to UTCNAO 1pps at 02:02UT on MJD54250 (May 30,2007). UTC(NAO) was advanced about 388 nanosecond at 00:39UT on MJD 55427. : Time step of UTC(NAO) of 455 ns on MJD 55427. The master clock 1350779 at NAO was replaced with the clock 1351206 at 01:45UT on MJD 55910 The clock 1350779 was removed from our clock operation system due to a failure in 1 pps generation circuit. The clock would be reconnected to the system after its repair. : Change of master clock between MJD 55879 and 55884. NICT. Time step of UTC(CRL) of -12 ns on MJD = 51507.33 Frequency steps of UTC(CRL) in ns/d : MJD Freq. step 50864.0 -0.432 50934.0 +1.296 51038.0 +0.432 51399.0 +0.864 51473.0 -1.296 51667.0 -1.728 51735.0 +2.333 51977.0 +0.864 52320.0 +2.592 52373.01 +1.728 52404.01 -2.4192 52460.01 +0.864 52694.01 +0.6912 In CRL(the name changes to NICT from April 1), the TWSTFT antennas and system were moved to the new building between March 17 and March 25. In accordance with the move, It was changed that a delay from UTC(CRL) reference point to 1 pps input point of modem. The value of the delay changed from 303.05 ns to 1395.79 ns. This is equivalent to "UTCm-ESm" of a data format. This value is used from the data on March 26(TWAP53.090). We steered the frequency of UTC(NICT) by +0.3E-14 at 0:20 UTC of 27th April 2004 (+0.2592 ns/day at MJD = 53122.01). National Institute of Information and Communications Technology, Tokyo (Japan), formerly CRL. We steered the frequency of UTC(NICT) by +2.2E-15 at 0:20 UTC of 10th June 2004 and we had the time step of UTC(NICT) by -5ns at 4:30 UTC of 21th June 2004. Date Clock code Time Freq. Lab. ID MJD model ns ns/day xxxxx.xx CCCCCCC aaaaaaa.a bbbbb.bbb xxxx 100YY 53166.01 0 +0.190 NICT 10020 53177.19 -5.0 0.0 NICT 10020 Time step of UTC(NICT) of -5 ns on MJD = 53177.19 We steered the frequency of UTC(NICT) by +1.0E-14 at 0:20 UTC of 7th July 2004 and +2.0E-14 at 0:20 UTC of 29th July 2004. Date Clock code Time Freq. Lab. ID MJD model ns ns/day 53193.01 0 +0.864 NICT 10020 53215.01 0 +1.728 NICT 10020 e steered the frequency of UTC(NICT) by 2.0E-14 at 0:20 UTC of 2nd August 2004 and e had the time steps because we moved clocks 25th August 2004. ate Clock code Time Freq. Lab. ID JD model ns ns/day xxxx.xx CCCCCCC aaaaaaa.a bbbbb.bbb xxxx 100YY 3219.01 0 -1.728 NICT 10020 3242.23 1351882 +1210.5 0 NICT 10020 3242.25 1350112 +1202.8 0 NICT 10020 3242.27 1350332 +1153.4 0 NICT 10020 3242.29 1350343 +1210.6 0 NICT 10020 We had the time step of UTC(NICT) by -9.4ns at 6:00 UTC of 3th April 2005 and we steered the time and frequency of UTC(NICT) by +15ns and +8.3E-15 at 0:20 UTC of 5th April 2005. Date Clock code Time Freq. Lab. ID MJD model ns ns/day 53463.25 -9.4 0.0 NICT 10020 53465.01 +15.0 +0.71712 NICT 10020 Time step of UTC(NICT) of -9.4 ns on MJD 53463. We steered the frequency of UTC(NICT) by +0.2E-14 at 0:20 UTC of 4th August 2005. (+0.1728 ns/d on MJD 53586.01) We steered the frequency of UTC(NICT) by +0.3E-14(+0.2592) at 0:20 UTC of 5th October 2005 and +0.7E-14(+0.6048) at 0:20 UTC of 27th October 2005. We steered the frequency of UTC(NICT) by -0.8E-14 at 0:20 UTC of 21th December 2005. We steered the frequency of UTC(NICT) by +0.3E-14 at 0:20 UTC of 12th January 2006. And we steered the time of UTC(NICT) by +8ns at 0:20 UTC of 18th and 23th January 2006. Time step of UTC(NICT) of 8 ns on MJD 53753.01, and 8 ns on MJD 53758.01. NICT has replaced UTC(NICT) generation system since Feb. 7th 0h UTC. We have also replaced the multi channel GPS receiver from an Euro80 to a Septentrio. An internal delay of the Septentrio receiver have been adjusted to that of the NICT P3 receiver. Consequently, this change raised time jump of about 4.8 ns between Euro80 and Septentrio receivers. We steered the the time of UTC(NICT) by -5ns at 0:20 UTC of 2nd February 2006. We had the time steps of clocks because we changed the UTC(NICT) generation system at 0:00 UTC of 7th February 2006. The time difference of the new and the old UTC(NICT) generation system was +3.6ns at 0:00 UTC of 7th February 2006. And we had the time step because we moved a clock(1350907) and changed cables at 2:30 UTC of 9th February 2006. We had the time step of TA(NICT) because we calculated the TA(NICT) using by new system at March 2006.53795.00 0020020 -214982.6 0.0 NICT 10020 Space-Time Group (On April 1, 2006, the group of us name changed from Japan Standard Time to Space-Time.) New Generation Network Research Center NICT,Independent Administrative Institution Technology 4-2-1, Nukui-Kitamachi Koganei Tokyo 184-8795 JAPAN Space-Time Standards Group (On April 1, 2006, the group of us name changed from Japan Standard Time to Space-Time Standards.) New Generation Network Research Center http://www2.nict.go.jp/w/index-e.html NICT, Independent Administrative Institution Technology 4-2-1, Nukui-Kitamachi Koganei Tokyo 184-8795 JAPAN http://jjy.nict.go.jp/index-e.html We steered the time of UTC(NICT) by +20ns at 1:28 UTC of 24th April 2007. Time step of UTC(NICT) of +20 ns on MJD 54214.06. New cesium clocks (1351225, 1351866, 1360913, 1361217, 1361226 and 1361611) are added from 54224 MJD. New cesium clock (1350916) is added from 54409 MJD. UTC(NICT)Jumped about 3.5 nsec in 10th December 2011(2011-12-10) at 17:54:49 UTC A reason is for change operation of UTC (NICT). : Time step of UTC(NICT) of -3.5 ns on MJD 55905.75. Time step of UTC(NICT) of +3.3 ns on 56079.75. NIM . Apparent time step of UTC-UTC(NIM) between MJD = 51139 and MJD = 51144. Time step of UTC(NIM) of –2600 ns on MJD 53310. Time step of UTC(NIM) of 100 ns on MJD 54700.03. : Time step of UTC(NIM) of 100 ns on MJD 54700.03. UTC(NIM) has been modulated by -60ns on MJD 54831.36. Time step of UTC(NIM): 54831.36 0010048 -000060.0 00000.000 NIM 10048 Frequency step of UTC(NIM) :54844.14 0010048 0000000.0 -0002.160 NIM 10048 Time step of UTC(NIM) of -60 ns on MJD 54831.4 Frequency step of UTC(NIM) on MJD 55033.42 of -0001.037 ns/d NIM(Beijing) Change of master clock on MJD 55055. Time step of UTC(NIM) of -27.4 ns on MJD 55055.03. : Time step of UTC(NIM) of -27.4 ns on MJD 55055.03 due to change of master clock. : Change of master clock on MJD 55219.0. : Time step of UTC(NIM) of -15.6 ns on MJD 55224.0 due to change of calibration. Change of master clock and transfer to a new location on MJD 56214. NIMB. Time step of UTC(NIMB) between MJD 54049 and 54054 due to cable re-calibration. Erratum to Circular T229 No value available for [UTC-UTC(NIMB)] from MJD 54104 to 54129. : Time step of UTC(NIMB) of -30 ns on MJD 55543.37. Apparent time step of UTC(NIMB) of about +755 ns near MJD 56338. NIMT. National Institute of Metrology, Bangkok, Thailand. Apparent time step of UTC-UTC(NIMT) of about 1 microsecond between MJD = 52179 and MJD = 52184. Time step of UTC(NIMT) of -150 ns on MJD = 52395 due to change of calibration of GPS receiver at CRL. Apparent time step of [UTC - UTC(NIMT)] between MJD = 52804 and 52809 Corrected values /ns MJD UTC-UTC(NIMT) 53219 -1511.1 53224 -1525.3 53229 -1539.9 53234 -1561.4 53239 -1576.3 Apparent time step of [UTC-UTC(NIMT)] of about +2150 ns on MJD 53341. A few days ago UTC(NIMT) was shut down by absent of power line. I synchronized it GPSD0. Time step of UTC(NIMT) of -1573 ns on MJD 54316.2. Change UTC(NIMT)from Caesium clock HP 5071A opt 001 to a new Symmetricom 5071A opt 001 serial #US45382247 on 2 June 2008. : Change of master clock on MJD 54619 and apparent time step of UTC(NIMT) between MJD 54619 and 54624. NIMT has arranged a new system of UTC(NIMT) realisation. The new UTC(NIMT) is defined at the output of the distribution amplifier as displayed in the attached file. This system will use the SDI HROG-5 S/N 06FS09-06 to control UTC(NIMT). Formerly the UTC(NIMT) is stated at the output of the Cs clock (BIPM clock code 352247). We intended to synchronize both Cs close to 0 UTC and I’ll start it around next week. NIMT will stop operating the current UTC(NIMT) realisation system for few days. The new UTC(NIMT) realisation system as previously informed will be started after finishing the setup. : Apparent time step of UTC(NIMT) of about +340 ns on MJD 55545.25. NIS . National Institute of Standards, Cairo (Egypt). Apparent time step of UTC(NIS) of about +235 ns near MJD 56332. NIST. There is a time step of about -1616 ns in the data for clock 159866 on about MJD 53412. Reset clock 1400201 by -200 ns because of problem with cable. Reset is exactly 1 cycle at 5 MHz. Clock 1159866 failed and was removed from the scale at MJD 53466. It was sent for repair and will be returned to the scale when it is repaired. Clocks 1352031, 1350282, 1352034, and 1352032 are new 5071 clocks with high-performance tubes. They are located at radio station WWV in Fort Collins and are linked to UTC(NIST) using a special GPS link. 1. The maser 1400203 has a time step because of a failure in the distribution amplifiers. The step is a multiple of 200 ns, since the measurement system works at 5 MHz. 2. Clock 1350282 has a frequency drift. It is probably running out of cesium. We will replace the tube when it fails. Maintenance on MJD 53930, clock 1400204 produced a time step of about -335 ns. GPS data is from a new multichannel receiver. This will be the default NIST receiver from now on. Reset of clock 1400201 caused by failure of distribution amplifier. Reset is exact multiple of 200 ns periods. On MJD 54214 18 UTC we changed the hardware used to compute and distribute UTC(NIST) because the AOG we had been using developed a hardware problem. The new AOG is controlled by a different measurement system.The new measurement system is made by Timing Solutions and uses measurement and time scale software developed at NIST. The old measurement system, which used Erbtec hardware is still used, but will be a backup to the new system until its AOG can be repaired. The time scales computed using the two systems differ by about 400 ps in time and less than 1e-16 in fractional frequency. These differences are probably too small to be seen in our data. The power supply to clocks 1352031, 1350282, 1352034 and 1352032 failed on MJD 54227 and the clocks, the distribution amplifiers and a part of the measurement system stopped working on that date. The hardware was repaired and that part of the ensemble was restarted on MJD 54240. I think the clocks have the almost the same frequencies as before the failure, but you should treat them as new clocks in your analysis. 1. Clock 1159866 failed on MJD 54278. It has been removed from the scale and will be repaired. 2. Reset on clock 1400206 due to failure of 5 MHz divider. Reset is an exact multiple of 200 ns. 3. Power supply for clocks 1352031, 1350282, 1352034 and 1352032 failed again on MJD 54278. The clocks were restarted on the same day with a large time step. I think there is no change in the frequencies. The resets on MJD 55303 were caused by a change in the cable delay in the measurement system. The clocks were not affected. Measurement system failure on MJD 55332 and 55333. The values for UTC(NIST) have some time steps during this period. The system was repaired before the data point at 0 hours on MJD 55334. The data before and after this period are not affected. NMIJ. National Metrology Institute of Japan, formerly NRLM. Frequency step of UTC(NMIJ) of +2.16 ns/d on MJD = 52806.01 The maintenance of our hydrogen maser (1405014) was performed from 01:00-03:00 on MJD 53115 (UTC), and there might be small steps of time and frequency on the HM data (145014) at this time. We introduced an AOG for generation of UTC(NMIJ) from this June 3, 2004(MJD=53159). and a change of structure of T&F orgatization in NMIJ, a newly bult section named Frequency Measurement Systems section is in charge of generation of UTC(NMIJ) and time transfer in NMIJ. Corrected values /ns: MJD UTC-UTC(NMIJ) 53184 151.3 We changed our source of UTC(NMIJ) from Agilent 5071A(1350459) to Anritsu H-Maser(1405014) on 3rd, March 2006. New type of H-Maser name of "SD1T01A" which is a product of ANRITSU, the clock code is 1405015. Erratum, corrected uncertainty values for Circular T 261: uB/ns u/ns NMIJ: 5.1 5.1 NMLS. National Metrology Laboratory of SIRIM Berhad, Shah Alam, Malaysia. Apparent time step of UTC-UTC(NMLS) between MJD = 52344 and MJD = 52349. Apparent time step of UTC-UTC(NMLS) between MJD = 52734 and MJD = 52739. Apparent time step of [UTC - UTC(NMLS)] between MJD 52819 and 52824 due to GPS receiver failure. Move to a new location in Sepang. : Apparent time step of UTC(NMLS) of about -600 ns between MJD 54684 and 54689. Our current master clock has failed, and we are going to change to another master clock HP 5071A with high performance tube, serial number is 3249A00328. : Change of master clock on MJD 54901. : Change of master clock on MJD 55175. : Time step of UTC(NMLS) of -2120 ns due to change of master clock on MJD 55209.06. NPL . Change of master clock between MJD = 51004 and MJD 51009. Frequency steps of UTC(NPL) in ns/d : MJD Freq. step 51008.73 -0.7 51101.60 +0.8 51240.48 +0.4 51534.73 +0.604 51535.45 -0.604 51563.41 +1.00 51648.50 -0.60 51863.53 +0.80 51925.50 +0.80 52086.66 -1.00 52250.72 +1.80 52397.39 +1.00 53034.45 1401701 0000000.0 +0000.998 NPL 10017 53034.45 0010017 0000000.0 +0000.998 NPL 10017 The following frequency steps have been applied to the NPL clock ensemble: Date MJD 53202.70 Clock code 1401701 Time step 0 ns Frequency step -0.998 ns/day Date MJD 53202.70 Clock code 0010017 Time step 0 ns Frequency step -0.998 ns/day Apparent time step of [UTC-UTC(NPL)] of +4.1 ns on MJD 53353 due to TW calibration. he following frequency steps have been applied to the NPL clock ensemble: ate MJD 53433.66 Clock code 1401701 Time step 0 ns Frequency step +0.801 ns/day ate MJD 53433.66 Clock code 0010017 Time step 0 ns Frequency step +0.801 ns/day The following frequency steps have been applied to the NPL clock ensemble: Date MJD 53692.50 Clock code 1401701 Time step 0 ns Frequency step +2.001 ns/day Date MJD 53692.50 Clock code 0010017 Time step 0 ns Frequency step +2.001 ns/day Global clock ensemble frequency changes : Date MJD 54319.50 Clock code 1401708 Time step 0ns Frequency step +2.336 ns/day. Date MJD 54319.50 Time step 0ns Frequency step +2.336 ns/day. Please note that the following frequency changes have been applied to the NPL clock ensemble: 54404.50 1401708 0000000.0 -0001.198 NPL 10017 54404.50 0010017 0000000.0 -0001.198 NPL 10017 Please note that the following frequency changes have been applied to the NPL clock ensemble: 54404.50 1401708 0000000.0 -0001.198 NPL 10017 54404.50 0010017 0000000.0 -0001.198 NPL 10017 Apparent time step of UTC(NPL) of about 51 ns on MJD 54469.2 and about -51 ns on MJD 54474.6. Please note that the following frequency changes have been applied to the NPL clock ensemble: 54503.50 1401708 0000000.0 +0002.001 NPL 10017 54503.50 0010017 0000000.0 +0002.001 NPL 10017 The following frequency changes have been applied to the NPL clock ensemble: 54605.69 1401708 0000000.0 -0000.998 NPL 10017 54605.69 0010017 0000000.0 -0000.998 NPL 10017 Frequency step of UTC(NPL) on 54903.67 0010017 0000000.0 +0001.095 NPL 10017 : The GPS receiver used for the computation of the time link at NPL was affected 56016.52 0010017 0000000.0 +0000.998 NPL 10017 NPLI. Apparent time step of UTC-UTC(NPLI) between MJD = 51524 and MJD = 51529. Time step of UTC(NPLI) of +13300 ns on MJD = 52341. ps data for the month of March,2005 has been sent, but there we forgot o mention that a phase offset was given on MJD 53439 at 0930 UTC by 9.85 icroseconds and also frequency offset by -88X10E-15 on the same day. For urther improvment of the perfomance we are still in the process of djusting the frequency offset. Time step of UTC(NPLI) of 9850 ns on MJD 53439.4. Apparent time step of UTC(NPLI) of about 176 ns on MJD 53550 due to change of GPS equipment. Time step of UTC(NPLI) of +500 ns on MJD 53629.2. We have phase adjusted NPLI by an amount +0.15 micro seconds on 53703 at 10.23 UTC. Time step of UTC(NPLI) of about 240 ns on MJD 53703 Time step of UTC(NPLI) of 200 ns on MJD 53874. Apparent time step of [UTC-UTC(NPLI)] of about -295 ns between MJD 53929 and MJD 53934. NPLI has been given a phase jump of 0.45usec. on 54028MJD(20/10/06). The new Csis of Model no.5071A with option 001 and s.no.US45382257. It has been given a freq. offset of +152*10-15 and connected to GPS receiver TTS2 from 19/01/07(MJD 54119). Data between 11/01/07 and 19/01/07 will not be there as it was unreliable. Change of master clock on MJD 54119. Time step of UTC(NPLI) of +250 ns on MJD 54164.3 Time step of UTC(NPLI) of +350 ns on MJD 54229. Time step of UTC(NPLI) of +200 ns on MJD 54305.38 A phase jump of -50 nSec is given on 54388 MJD Regards Time step of UTC(NPLI) of -50 ns on MJD 54388.0 : Change of master clock between MJD 55974 and 55979. Time step of UTC(NPLI) of +190 ns on MJD 56351. NRC . Time step of UTC(NRC) of + 145 ns on MJD = 50827.66 Change of master clock on MJD = 51281.75 Time step of UTC(NRC) of -10 ns on MJD = 51694.8 Frequency steps of UTC(NRC) in ns/d : MJD Freq. step 50834.00 +0.432 51114.00 -0.864 51149.00 +0.864 51229.00 -1.728 51289.00 +0.864 51519.00 -0.864 51569.00 +0.432 51589.00 +1.296 51604.00 -0.864 51709.00 +0.864 51754.00 -0.864 51929.00 +0.432 51969.00 +0.432 52304.00 -0.864 On MJD 53678 the cesium beam tube in HP372 was replaced with a new high performance beam tube. There was a jump of ~100ns and no attempt was made at keeping the old frequency. Change of master clock on MJD 53751.2. Change of master clock on MJD 53752.9. 2006-01-31, MJD = 53766 @ 15:30 UTC the micro-stepper was adjusted to +1.38 ×10-14. 2006-02-28, MJD = 53794 @ 0:00 UTC the micro-stepper was adjusted to +2.78 ×10-14. This is a change of +1.40 ×10-14.From approximately MJD = 53780 @ 21:00 UTC until approximately MJD = 53781 @ 15:00 UTC, our signal UTC(NRC) was delayed by 62200 ns. MJD = 54039 @ 00:00 UTC(NRC) the micro-stepper was adjusted to -0.22 ×10-14. This is a change of -3.00 ×10-14. MJD = 54062 @ 20:00 NRC clock Cs234 (Hp 5071A) was installed with a new beam tube. 2006-12-01, MJD = 54070 @ 15:30 the source of UTC(NRC) was changed from Cs372 to Cs234 and the micro-stepper was adjusted to +21.67 ×10-14. 2006-12-15, MJD = 54084 @ 15:45 the micro-stepper was adjusted to +4.50 ×10-14. This is a change of -5.00 ×10-14. Change of master clock on MJD 54070.65. 2007-01-11, MJD = 54111 @ 15:10 the micro-stepper was adjusted to: +0.50 ×10-14. This is a change of -4.00 ×10-14. MJD = 54669 @ 00:00 the micro-stepper was adjusted to: +2.50 ×10-14. This is a change of +2.00 ×10-14 MJD = 54685 @ 18:00 the source of UTC(NRC) was changed, and will be supplied by Cs2152 until further notice. : Change of master clock on MJD 54695.75. 2008-10-08, MJD = 54747 @ 21:00 the micro-stepper was adjusted from -11.50 ×10-14 to -9.00 ×10-14. This is a change of +2.50 ×10-14. ERRATUM, Corrected values /ns: MJD   UTC-UTC(NRC) 54769     36.8 54774     30.3 54779    27.1 54784     18.1 54789     17.7 54794     25.1 NRC : ERRATUM, Corrected values /ns:   MJD   TAI-TA(NRC) 54774    31908.9 54779    31920.6 54784    31940.8 54789    31957.0 54794    31986.9 Frequency step: on 2009-04-09, MJD = 54930 @ 16:00 the micro-stepper was adjusted from -11.00 ×10-14 to -8.00 ×10-14. This is a change of +3.00 ×10-14. 2009-05-14, MJD = 54965 @ 15:30 the micro-stepper was adjusted from -8.00 ×10-14 to -9.00 ×10-14. This is a change of -1.00 ×10-14. 2009-05-24 MJD = 54974 15:42 there was a general electric power failure in the laboratory which caused all four reported clocks to power off. 2009-05-25 MJD = 54975 01:45 electric power was restored and all four reported clocks were powered on.2009-05-25 MJD = 54975 20:30 UTC(NRC) was restored to less than +35 ns from its previous value. : Time step of UTC(NRC) of 35 ns on MJD 54975.9 2010-02-12, MJD = 55239 @ 15:40 the micro-stepper was adjusted from -9.00 ×10-14 to -6.00 ×10-14. This is a change of +3.00 ×10-14 to the rate of UTC(NRC) 2010-03-05, MJD = 55260 @ 21:06 the micro-stepper was adjusted from -6.00 ×10-14 to -9.00 ×10-14. This is a change of -3.00 ×10-14 to the rate of UTC(NRC). 2010-11-15, MJD = 55515 @ 15:45 the micro-stepper was adjusted from -7.00 ×10-14 to 0.00 ×10-14. This is a change of +7.00 ×10-14. 2010-11-17, MJD = 55517 @ 15:45 the micro-stepper was adjusted from 0.00 ×10-14 to -7.00 ×10-14. This is a change of -7.00 ×10-14. At approximately MJD = 55561 @ 15:00 one of our caesuim clocks, identified in our monthly submission as 1352151, stopped normal operation. An internal error listed as "Hotwire supply regulation failure" was logged.  The clock was powered down, then powered up again and resumed normal operation at approximately MJD = 55564 @20:30.  The phase was adjusted to produce an uninterrupted timescale contiuning from the previously known value. No value is published in the "step data" section of the monthly submission. : Link combination of TWSTFT and GPS. : Link combination of GPS and GLONASS. At approximately MJD = 55617 @ 16:38 our caesuim clock, identified in our monthly submission as 1352152, wasadjusted in frequency by a rate of -19e-15. This action is included in the monthly submission and is also stated here to remind you that this change will also affect the rate of UTC(NRC).  The NRC microstepper was not adjusted. 2011-04-19, MJD = 55670 @ 16:12 the micro-stepper was adjusted from -7.00 ×10-14 to -6.00 ×10-14. This is a change of +1.00 ×10-14. 2012-08-31, MJD = 56170 @ 19:25 the micro-stepper was adjusted from -6.00 ×10-14 to -5.00 ×10-14. This is a change of +1.00 ×10-14. NRL . U.S. Naval Research Laboratory - Washington, D.C. Erratum, corrected uncertainty values for Circular T 261: uB/ns u/ns NRL : 5.1 5.1 NRLM. Apparent time step of UTC-UTC(NRLM) between MJD = 51544 and MJD = 51549. NTSC. National Time Service Center of China, formerly CSAO. OCA . Une correction de fréquence a été appliquée sur le microphase stepper qui génčre UTC(OCA) ŕ partir de l'horloge 1351556. 54749.60 1351556 000000.0 00003.472 OCA 10009 54878.65 1351556 000000.0 00004.765 OCA 10009 Samedi 23/10/2010 ŕ 12:48 UTC (MJD 55492.53333), un saut de fréquence (sans saut de phase) a été appliqué sur l'horloge de référence (0010007 (Syrte) / 10009 (BIPM)). La correction précédente était de -3.5426e-14 (-3.061 ns/jour), elle est maintenant de -6.3716e-14 (-5.505 ns/jour), soit une modification relative de -2.8290e-14 (-2.44 ns/jour). Jeudi 21/04/2011 ŕ 17:51 UTC (MJD 55672.74375), j'ai appliqué un saut de fréquence (sans saut de phase)sur notre horloge de référence (0010007 (Syrte) / 10009 (BIPM)). de La correction précédente était -6.3716e-14 (-5.505 ns/jour), elle est maintenant de -1.21589e-13 (10.505 ns/jour), soit une modification relative de -5.7873e-14(-5 ns/jour). Correction frequence UTC(OCA) 20110506 20:51 UTC (MJD 55687.86875): Vendredi 06/05/2011 ŕ 20:51 UTC (MJD 55687.86875), un saut de fréquence (sans saut de phase) surl'horloge de référence (0010007 (Syrte) / 10009 (BIPM)). La correction précédente était de -1.21589e-13 (-10.505 ns/jour), elle est maintenant de -8.6864e-14 (-7.505 ns/jour), soit une modification relative de -3.4725e-14 (-3 ns/jour). En fait, il semble qu'un problčme de notre microphase stepper aie entrainé une correction de fréquence beaucoup plus importante que prévue ŕ la suite de la derničre correction: on aurait dű rattraper notre écart de phase d'environ 3 ns/jour et en fait on a observé un rattrapage de l'ordre de 20 ns/jour. Cela explique ces deux corrections aussi rapprochées. Les paramčtres du microphase stepper indiquant que l'OCXO interne était assez loin de sa fréquence nominale (PLL en butée), j'ai ajusté sa fréquence ce soir, sans saut de phase et en conservant pour l'instant la correction que j'ai appliqué hier et qui semblait n'avoir eu aucun effet. Il est donc possible qu'elle n'agisse qu'aprčs cet ajustement, c'est ŕ dire ce soir 07/05/2011 ŕ 22:46 UTC (MJD 55688.94861). J'ai affiné le calcul de la position de l'antenne de notre GPS GZOC03. (La position physique de l'antenne n'a pas été modifiée). Les anciennes valeurs étaient: X=4581677.4832, Y=556174.9124, Z=4389369.2842 et les nouvelles sont: X=4581678.8004, Y=556175.7369, Z=4389370.1303 J'ai appliqué le changement aujourd'hui 10/05/2011 ŕ 00:32 UTC (MJD 55691.02222) Aujourd'hui 11/05/2011 ŕ 07:59 UTC (MJD 55692.33264), j'ai introduit les valeurs de calibration dans notre récepteur GPS GZOC03. Int_dly = -19.2 ns, P1P2_dif = -7.0 ns, P1C1_dif = -4.5 ns Mardi 17/05/2011 ŕ 00:23 UTC (MJD 55698.01597), j'ai appliqué un saut de fréquence (sans saut de phase) sur notre horloge de référence (0010007 (Syrte) / 10009 (BIPM)). La correction précédente était de -8.6864e-14 (-7.505 ns/jour), elle est maintenant de +8.6746e-14 (+7.495e-009 ns/jour), soit une modification relative de +1.7361e-013 (+15 ns/jour). Mercredi 07/12/2011 ŕ 18:09 UTC (MJD 55902.75625), un saut de fréquence de +233e-15 (+20.1312 ns/jour) sur Maser T4S 1400936 (annulation du saut de fréquence du MJD 55887. ONBA. Time step of UTC(ONBA) of + 9450 ns on MJD = 50968.0 Apparent time step of UTC-UTC(ONBA) between MJD = 52219 and MJD = 52224. Apparent time steps of UTC - UTC(ONBA) between MJD = 52769 and MJD = 52774 and between MJD = 52779 and MJD = 52784 Time step of UTC(ONBA) of 2000 ns on MJD 53019.58 Apparent time step of [UTC-UTC(ONBA)] of about -2000 ns on MJD 53389. Apparent time step of [UTC-UTC(ONBA)] of about 500 ns on MJD 54115. Change of master clock on MJD 54164.5 TTS 2 Data 54318-54325 missing. New atomic clock in operation, the clock is a Cesium H-P/Agilent/Symmetricom 5071A High Performance. The clock code is 1350102. Time step UTC(ONBA) of 6400 ns on MJD 56149.0291was done. Missing data between MJD 56144 and 56149,GPS receiver not recorded. Time step of UTC(ONBA) -6400 ns on MJD 56149.03. ONRJ. Apparent time step of UTC(ONRJ) between MJD 51849 and 51854 MJD = 52978, new master clock (DATUM(FTS) 4065C/076, s/n 0316006184, high performance tube). Change of master clock on MJD = 52978 Apparent time step of [UTC-UTC(ONRJ)] due to change of master clock on MJD 53340. Apparent time step of [UTC-UTC(ONRJ)] on MJD 53422 due to change of master clock. Time step of UTC(ONRJ) between MJD 54039 and 54044 due to master clock and GPS receiver changes. 54710 00:06:00 to 54713 20:42:00 data with internal delay = -13.70ns (TTSONRJ0809_A.txt) 54713 21:42:00 to 54742 16:10:00 data with internal delay = 20.00ns (TTSONRJ0809_B.txt). No adjustment was made in UTC(ONRJ). Time step of UTC(ONRJ) of -33.7 ns on MJD 54713.9 due to Internal Delay change of the GPS receiver. Corrected values /ns:  MJD   UTC-UTC(ONRJ) 54714     14.1 54719     -2.0 54724    -11.3 54729     -5.2 54734      5.3 54739      6.2 Time step of UTC(ONRJ) of -33.7 ns on MJD 54713.9 due to Internal Delay change of the GPS receiver. : Apparent time step of UTC(ONRJ) between MJD 55894 and 55899 of about 20 ns due to calibration. OP . Change of master clock on MJD = 51724.69 and on MJD = 51743.61 Change of master clock on MJD = 52396.58 Frequency steps of UTC(OP) in ns/d : MJD Freq. step MJD Freq. step MJD Freq. step 50813.56 +0.432 51941.56 +0.432 52478.56 +1.296 50964.56 -0.432 52061.56 -0.432 52579.56 -0.432 51028.56 +1.296 52152.56 -0.432 52698.56 -1.296 51238.56 -0.432 52243.56 +0.864 52730.56 +0.864 51299.56 -0.432 52362.56 -0.864 52747.56 +0.432 51635.56 -0.864 52425.56 +0.432 52816.56 +0.864 51757.56 -0.432 52456.56 +0.432 UTC(OP) a fait un saut de phase de 161 833,0 ns (incertitude 200 ps) le 14/09/2007 ŕ 19h55. Ce saut a été compensé par un saut de męme amplitude et de signe opposé vers 08h15 le 17/09/2007. Toutes les mesures du fichier HORBIPM.DAT de OP sont affectés par ce saut pour le MJD 54359.Ce saut concernant l'horloge pivot, il n'a pas perturbé le calcul du TA(F). La détections de données erronées nous ŕ conduit ré-éditer certains de nos fichiers. Veuillez ignorer les fichiers précédant et télécharger les mises ŕ jour des fichiers : OP54354.GPS (données GPS C/A d'OP [54354-54360]) HORBIPM.DAT Une message d'information suivra pour la gestion du lien TWSTFT d'OP. Until MJD 56218, UTC(OP) was produced with an industrial cesium clock. The output signal was "manually" steered towards UTC by applying frequency corrections, using a microphase stepper. On MJD 56218, the input clock of the microphase stepper was replaced by a hydrogen maser. The frequency corrections are now deduced from the SYRTE primary frequency standards calibrations. Between MJD 56220 and 56229, we applied an additional frequency correction of the order of 1 E-14, to reduce to close to 0 the phase difference between UTC(OP) and UTC at the end of the October Circular T period. Since MJD 56229, the frequency corrections mainly rely on the SYRTE fountains calibrations. ORB . Apparent time step of UTC-UTC(ORB) of - 94 ns between MJD = 51209 and MJD = 51214 due to change of GPS receiver setup. On MJD = 51526.52, time step of UTC(ORB) of + 688 ns. Change of master clock on MJD = 52212. Temporary change of master clock from MJD = 52353 to MJD = 52359. Time step of UTC(ORB) of +19 ns on MJD = 52417.3 Frequency steps of UTC(ORB) in ns/d : MJD Freq. step MJD Freq. step MJD Freq. step 50834.3 -4.320 51365.2 -0.864 51932.1 -1.728 51526.52 +1.642 52026.42 -6.048 52185.33 +6.912 51561.573 +3.974 52038.35 +12.096 52211.42 -4.320 51576.438 +5.184 52050.31 -6.048 52305.43 -1.728 51592.458 -9.158 52061.29 -1.123 52240.64 -0.864 51672.154 -1.901 52065.38 -5.184 52422.4 -5.011 51745.154 +2.246 52088.38 +5.184 52425.5 +6.739 52460.6 -4.320 52624.35 -1.728 52466.3 +0.864 52655.39 -1.728 52519 -15.552 52787.34 -1.728 52529 +16.416 52827.32 +0.864 52537 +4.320 52844.42 -6.912 52597.60 -0.864 Frequency step of UTC(ORB) of +0.864 ns/d on MJD = 52872.31 Frequency step of clock 1402601 of +0.864 ns/d on MJD = 52904.31 Apparent time step of [UTC - UTC(ORB)] between MJD 52879 and 52884 due to calibration of GPS equipment. ous avons effectué une correction de fréquence de l'horloge 402601 qui est aussi la référence de UTC(ORB); orrection de -1.0e-14 ce 13/09/2004(mjd 53261) ŕ 13h30UT noter que l'horloge 1350201 est en réparation . Nous avons effectué un nouveau saut de fréquence de -2e-14 aujourd'hui, soit mjd=53671.6 ŕ notre maser (2601), servant ŕ la définition de UTC(ORB). Change of master clock between MJD 53706 and MJD 53714. Une correction de fréquence de -1e-14 a été effectuée sur le maser CH1-75 (2601) servant ŕ la génrération de UTC(ORB) le 24 juillet 2006 ŕ 12h UT. Erratum, corrected uncertainty values for Circular T 261: uB/ns u/ns ORB : 5.1 5.1 A partir du 31/3, on a changé de maser pour faire le UTC, en prenant le maser CH1-75A. Un problčme avec le Maser donnant la fréquence de UTC(ORB) ce mois-ci. (de nouveau, perte du PLL). Il faudrait donc ne pas utiliser les données RINEX entre 55473.3 et 55474.5 Les nouvelles valeurs de calibration aprčs remise en ordre du systčme sont XP+XO=48.6 des soucis avec les maser, source de UTC(ORB), il ne faut donc pas utiliser nos données GPS de 55473. ŕ 55477.5 55496.1 ŕ 55498.4 : Change of master clock about MJD 55915. Time step of UTC(ORB) of +5.3 ns on MJD 56383 due to receiver calibration. PL . Time step of -94 ns of UTC(PL) on MJD 52428.74 Frequency step of UTC(PL) of -0.5184 ns/d on MJD = 52394.61 Frequency step of UTC(PL) of +1.6416 ns/d on MJD = 52746.47 Frequency step of clock 1351120 of -1.642 ns/d on MJD = 52897.58 Time step of UTC(PL) of -300 ns on MJD = 52946.59 On MJD = 53081 we decided to change the GUM master clock (generating UTC(PL)) from [351120] to [350502]. We have done it due to difficulties with the precise frequency change of the [351120] clock, non-typical steps of the E-multiplier voltage and near end of life of its caesium tube. To avoid the discontinuity of UTC(PL) we did the following: - on MJD = 53081.56 the time step = -248 ns was applied for [350502]; - on MJD = 53081.57 the frequency step = -32e-15 was applied for [350502] (from 0 to -32e-15); - on MJD = 53081.58 the master clock was switched from [351120] to 350502]. n MJD 53275 at 9:20 UTC source of UTC(PL) [master clock of GUM] was changed from 350502 standard o 350441 standard (both HP5071A opt. 001). It was done due to the abnormal ion pump behavior, dicating ion pump malfunction, of 350502 standard (which was our master clock and source of UTC(PL)). ortunately, we changed master clock when 350502 were functional. o avoid disontinuity of UTC(PL) on 53275 MJD at 9:00 UTC the time step of 350441 tandard of -55.4 ns was done. urrently the master clock of GUM and source of UTC(PL) is 350441 HP5071A standard. Change of master clock on MJD 53275. n 53310 MJD (at 0:00 UTC) we changed the source of UTC(PL) from 350441 cesium standard to system ased on cesium standard - phase microstepper - frequency divider. urrently source of UTC(PL) is output signal (PPS) from frequency divider. ue to system synchronization to previous source of UTC(PL) no time step was introduced to UTC(PL). n 53310.40 MJD time step of 351934 standard of -39ns occured due to GPS antenna malfunction. isabled antenna was replaced with new one and due to different internal delays mentioned tep of -39ns occured in comparisons. Change of master clock on MJD 53310.0. n 53310 MJD (at 0:00 UTC) we changed the source of UTC(PL) from 350441 cesium standard to system ased on cesium standard - phase microstepper - frequency divider. urrently source of UTC(PL) is output signal (PPS) from frequency divider. ue to system synchronization to previous source of UTC(PL) no time step was introduced to UTC(PL). n 53310.40 MJD time step of 351934 standard of -39ns occured due to GPS antenna malfunction. isabled antenna was replaced with new one and due to different internal delays mentioned tep of -39ns occured in comparisons. 1. Since 53499 MJD we have started sending data for 351120 standard (HP5071A) with new cesium tube (CBT ID: US42401886(H)). 2. On 53510.344 MJD intentional time step of 350761 standard (HP5071A) of -3400.0 ns was performed. Since MJD: 53499, Cs [1351120] with new cesium tube (CBT ID: US42401886(H)) is back in service. Since MJD: 53505, the ITR clock [1361395] is out of service because of the power break-down. On 53510.344 MJD intentional time step of clock [1350761] of -3400.0 ns was performed. Because of temporary failure of the first our GPS receiver, we are sending data from the second (reserve) one. On MJD=53551.566 frequency step +7e-14 of the 1350502 standard was done. On MJD=53551.572 time step +1250 ns of the 1350502 standard was performed. Since 53554 MJD we again started sending data for 1350745 standard (HP5071A) with the new cesium tube (CBT ID: US42401828(H)). Comments: On MJD = 53775 at 13:00 UTC intentionally time steps of the 351746 and 350745 HP5071A standards were performed. Time step of 351746 standard: +245 ns, time step of 350745 standard: -40 ns. No data for 54324. Clock phase jump 1351709 on MJD 54318.32 dt = +500.0 ns. On MJD 55986.5833 (14:00 UTC, 29th February 2012), we have introduced intentionaly time step of UTC(PL): - 16.1 ns, according to results of BIPM calibration trip in 2010. It is a result of introduction of the correction +16.1 ns to internal delays in our main TTS-2 receiver. : Time step of UTC(PL) of -16.1 ns on MJD 55986.58 due to receiver calibration. Due to some technical problems, on MJD 56208 at 14:00 UTC (8th October 2012) we had introduced time step of UTC(PL) of: +100 ns, and on MJD 56229 at 13:00 UTC (29th October 2012) we have restored to its previous state and introduced time step of UTC(PL) of: -100 ns. Time steps of +100.0 ns and -100.0 ns concern time steps of UTC(PL) due to some technical problems. 56208.58 10040 100.0 0.000 PL 10040 56229.54 10040 -100.0 0.000 PL 10040 Time step of UTC(PL) of +100ns on MJD 56208.58. 56229.54 10040 -100.0 0.000 PL 10040 Time step of UTC(PL) of -100ns on MJD 56229.54. PSB . Apparent time step of UTC-UTC(PSB) between MJD = 51254 and MJD = 51259 due to a power supply failure at PSB. Change of master clock on MJD = 51778.2 Time step of UTC(PSB) of +2368 ns on MJD = 51928.29 PTB . Time step of UTC(PTB) of +1900 ns on MJD = 50814.0 Frequency steps of UTC(PTB) in ns/d : MJD Freq. step MJD Freq. step MJD Freq. step 50904 +0.5 51209 +0.5 51999 -0.5 50929 +1.0 51269 +0.5 52059 +0.5 50964 +1.5 51329 -0.5 51024 +2.0 51389 +0.5 51119 +1.5 51509 -0.5 51148 +2.0 51909 +0.5 The frequency of PTB maser 40590 was increased by 2.5E-13 on MJD 53084 at 0:00 UTC. Starting from MJD 53614 the data of clock 1920003 are reported. MJD 55091, the H-maser H5, which is the reference of all TWSTFT equipment at PTB, has been moved to the new clock room. Thus, all TWSTFT equipment at PTB was disconnected for a short time. After resynchronization a phase jump occured in the maser data. Also, the frequency of H5 has changed by 10^-13, and an additional frequency change may be applied after internal evaluation. The UTC time transfer should not be affected by this procedure. Starting MJD 56079 0:00 UTC TA(PTB) is generated from an active hydrogen maser, steered in frequency so as to follow PTB CSF1 as close as possible. The deviation d between CSF1 and the TAI second is not taken into account. The rate of TA(PTB) is intended to represent CSF1 as if it was operated on the geoid. TAI-TA(PTB) has an initial arbitrary offset from TAI without continuity to the data reported in previous months. ROA . Apparent time step of UTC(ROA) between MJD 52049 and 52054 due to the change of master clock. Change of master clock on MJD = 52484.41 Frequency steps of UTC(ROA) in ns/d : MJD Freq. step 50981.42 -2.2 51137.39 -1.1 51366.46 +1.09 51507.46 -1.64 he ROA-PTB TW (ROAPTB.LkT) calibration correction is till now -4982 ns ecause the ESDVAR is not available. I slightly modified Tsoft to uniform ll the non calibration links and this correction in x:\TaN\MdLink.Lst (menu M1) ecomes:18 ns = 5000ns - 4982ns. The final result should not have any change. Time step of UTC(ROA) of 42.9 ns between MJD 53577.45 and 53578.30. SCL . Change of master clock on MJD = 51875.15 Change of master clock on MJD = 52339.158 Frequency steps of UTC(SCL) in ns/d : MJD Freq. step MJD Freq. step MJD Freq. step 50834.3 -4.320 51365.2 -0.864 51932.1 -1.728 50849.3 -3.456 51396.2 -1.728 52089.2 +0.864 50864.3 -3.456 51470.2 +0.864 52124.2 +0.864 50879.2 -3.456 51514.2 +2.592 52194.2 -0.864 50904.2 +3.456 51634.3 -1.728 52249.3 +0.864 50934.2 +3.456 51794.3 -0.864 52284.2 +0.864 51332.2 -0.864 51849.2 +0.864 52295.1 +0.864 52309.2 +0.864 52645.2 +0.864 52339.2 -0.864 52729.1 -0.864 52374.3 -0.864 Change of master clock on MJD = 52854, new clock is 1350621 Frequency step of UTC(SCL) of +0.864 ns/d on MJD = 52855.32 Change of master clock on MJD = 52870, new clock is 1350621 Frequency offset of +0.864 ns/d in the microphase stepper driving the UTC(SCL) on MJD = 52892.375 Frequency offset of -0.864 ns/d in the microphase stepper driving the UTC(SCL)on MJD = 52914.217 Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +1E-14 to 0E-14 at MJD 52949.252. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -1E-14 to -2E-14 at MJD53009.255. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -1E-14 at MJD53074.344. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -1E-14 at MJD53074.344. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from 0E-14 to -1E-14 at MJD53209.117. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -3E-14 at MJD53374.12700. was changed from -3E-14 to -4E-14 at MJD53384.07880. requency offset in the microphase stepper driving the UTC(SCL) was changed from -4E-14 to -5E-14 at MJD53403.15300. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -3E-14 to -4E-14 at MJD53739.23400. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -4E-14 to -5E-14 at MJD53769.27400. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -5E-14 to -4E-14 at MJD53809.14800. 1. Cs clock (1350621) remains as the master clock. 2. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -4E-14 to -3E-14 at MJD53859.24600. 3. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -3E-14 to -2E-14 at MJD53874.22900. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -3E-14 at MJD53919.13000. 1. Cs clock (1350621) remains as the master clock. 2. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -3E-14 to -4E-14 at MJD53969.32300. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -5E-14 to -4E-14 at MJD54119.13900. The same uncertainty values also apply to [UTC-UTC(SCL)] for Circular T 231. Cs clock (1350621) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -4E-14 to -5E-14 at MJD54220.15000. 1. There are not any clock data for MJD54294. 2. The master atomic clock HP5071A (s/n: US39301621) was found faulty at 11:43:40 UTC on MJD54294 (13/7/2007). 3. Now, the faulty master atomic clock is replaced by another primary frequency standard Agilent 5071A (s/n: US39301745) with high performance option 001. 4. The UTC(SCL) time was re-established at MJD54298.08500 (17/7/2007). Now, the UTC(SCL)is generated by a time scale generator that is driven by the new master clock (s/n: US39301745)together with a mircophase stepper. The frequency offset of the microphase stepper is set to 0. Change of master clock on MJD 54294.49 In August 2007, their slave microphase stepper and time scale generator have both been found faulty. 1. Cs clock (1351745) remains as the master clock. 2. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from 0E-14 to -1E-14 at MJD54354.33600. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -1E-14 to 0E-14 at MJD54494.29800. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -1E-14 to 0E-14 at MJD54494.29800. Cs clock (1351745) remains as the master clock. An unpredicted time step of -1395.1 ns was detected on Cs clock (1352178) at about MJD54537.174. The cause of the time step was unknown. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from 0E-14 to -1E-14 at MJD54594.12700. Cs clock (1351745) remains as the master clock. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -1E-14 to -2E-14 at MJD54769.23600. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -1E-14 at MJD54854.09500. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -1E-14 to -2E-14 at MJD54885.17700. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -1E-14 at MJD55029.12600.  Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -1E-14 at MJD55029.12600. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -1E-14 to -2E-14 at MJD55169.12900 Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -1.4E-14 at MJD55305.14300. Cs clock (1351745) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from -2E-14 to -1.4E-14 at MJD55305.14300.  1. Our master Atomic Clock with option 001 of Hi Performance (Model No.: Agilent 5071A, Serial No.: US39301745) was found faulty on 2 August 2010 (MJD55410). 2. Our another Atomic Clock with option 001 of Hi Performance (Model No.: Symmetricom 5071A, Serial No.; US48352525) have been assigned to be our new master clock in Standards and Calibration Laboratory (SCL) from MJD55411.100. No frequency offset in the  microphase stepper driving the UTC(SCL) was made. 3. From MJD55424.351, the output frequency of our another Atomic Clock (1352178) was steered with an offset of +7E-14 (+6.048 ns/day). : Change of master clock on MJD 55411.1. Cs clock (1352525) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from 0E-14 to +1E-14 at MJD55484.14900. Cs clock (1352525) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +1E-14 to +2E-14 at MJD55515.10300. 1. Cs clock (1352525) remains as the master clock. 2. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +2E-14 to +3E-14 at MJD55574.13800. Cs clock (1352525) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +3E-14 to +2E-14 at MJD55679.11500. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +2E-14 to +3E-14 at MJD55819.11500. Cs clock (1352525) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +3E-14 to +4E-14 at MJD55874.09400. Cs clock (1352525) remains as the master clock.  Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +4E-14 to +3E-14 at MJD55945.16200. Cs clock (1352525) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +3E-14 to +2E-14 at MJD56154.09700. Cs clock (1352525) remains as the master clock. Frequency offset in the microphase stepper driving the UTC(SCL) was changed from +1E-14 to 0E-14 at MJD56309.14300.  Frequency offset in the microphase stepper driving the UTC(SCL) was changed from 0E-14 to -2E-14 at MJD56321.09000. SG . Standards, Productivity and Innovation Board Singapore, formerly PSB. On MJD= 54536 (11 March 2008), we changed our master clock from HP 5071A cesium to H-maser 1407701. Change of master clock on MJD 54536. : Change of master clock on MJD 54654. We changed our master clock on MJD=55088 at UTC=7:00. The master clock was changed from a cesium (code=1351889) to a hydrogen maser (code=1407701) The two clocks are steered by two steering devices and no time step is involved. We installed time scale recently and have our own Atomic Time TA(SG). The TA(SG) data is reported in the clock data file. Due to the change of clock measurement hardware, all clock data of September have an one time step caused by the hardware We added two new Cs clocks and their codes are 1352475 and 1352476 respectively. : Change of master clock on MJD 55088.29 : Time step of UTC(SG) of -20 ns between 55284 and 55289 due to GPS calibration. We have changed our reference clock to a cesium with ID: 1351889 and Tube No: US42401889, with effect from MJD=56133. SIQ . Slovenian Institute of Quality and Metrology, Ljubljana. Time step of UTC(SIQ) of about +1350 ns on MJD 54378.0 Steering correction for our HP5071A. The correction was made directly by steering the frequency of the standard using it's internal steering correction provision. The correction was applied today 03.06.2008 or MJD 54627 at 12:00 UTC. The correction was +2.47x10**-13 or -21.336 ns/day : Apparent time step of UTC(SIQ) of about 100 ns on MJD 54709. We have made a deliberate step of approximately +500 ns on our standard. : Time step of UTC(SIQ) of 390 ns between MJD 54714 and 54719. SMD . : Metrology Division of the Quality and Safety Department- Scientific Metrology, Brussels, Belgium. The 4th of august SMD has changed it's master clock. Previously it was : Master Cesium clock HP 5071A sn: 3249A00810 and since 4th of August 2010 it is:Master Cesium clock HP 5071A sn: US48352543. Note that this clock (sn US48352543) is included in the clock data as from MJD 55414. Note also that the clock data for the clock with sn: 3249A00810 is still included in the clock data file. : Change of master clock on MJD 55412. A difference of +33,1 ns on the clock data nr 13522003 has been registered on February 27th, 2012 (MJD 55984) at 00:00:00 due to the change of a 1 pps   Distribution Amplifier. Apparent time step of UC(SMD) of +25ns on MJD 56180.03. SMU . Apparent time step of UTC-UTC(SMU) of about + 170 ns between MJD = 51034 and MJD = 51039. Since MJD 53 209 is working new CS standard as a source of UTC(SMU): source: HP 5071A standard 001 No. 3608A01193 with CBT No. 3124A00486(S) This Cs standard is in operation since I./2003 like a reserve standard, was regulary measured, now is the source of UTC(SMU), because has better stability. Time step is for me indifferent, UTC(SMU) with this Cs started with value near zero. The measurement of GPS are attended. Apparent time step of UTC(SMU) of +10360 ns between MJD 53202 and 53204 due to a change of master clock. Correction to Circular T199 note (3): Apparent time step of [UTC-UTC(SMU)] of +10360 ns between MJD 53202 : Apparent time step of UTC(SMU) of about +70 ns on MJD 55743. Apparent time step of UTC(SMU) of about +140 ns near MJD 56050.5. SO . Change of master clock on MJD = 51091. SP . Time step of UTC-UTC(SP) of +43 ns between MJD = 50889 and MJD = 50894 due to GPS link calibration. Frequency steps of UTC(SP) of +4.32 ns/d on MJD = 51051.28 and of -2.592 ns/d on MJD = 51421.47 Frequency steps of UTC(SP) of -4.32 ns/d on MJD = 51786.27 Change of master clock on MJD = 52155. Frequency step of UTC(SP) of +5.184 ns/d on MJD = 52206.29 Frequency step of UTC(SP) of +3.456 ns/d on MJD = 52396.28 Frequency step of UTC(SP) of -5.184 ns/d on MJD = 52641.33 Time step of UTC(SP) of -7.6 ns on MJD 53826 due to a new calibration (see Section 6). Corrected uncertainties for MJD 53854 to MJD 53884: (uA,uB,u) = (0.8, 2.3 , 2.4) ns. the master clock for UTC(SP) was changed yesterday on MJD 54551 at 14:15 UTC. After the change, UTC(SP) was adjusted to within 1 ns compared to its previous value. Change of master clock on MJD 54551.6. SU . Apparent time step of UTC-UTC(SU) between MJD = 50954 and MJD = 40959 due to change of GPS receiver. Frequency step of clock 1403807 of +0.6 ns/d on MJD = 52898.50 Frequency step of clock 1403810 of -1.4 ns/d on MJD = 52898.50 Time step of clock 1403827 of +17.9 ns on MJD = 52935.17 Time step of clock 1403831 of +13.8 ns on MJD = 52935.21 Time step of clock 1403837 of -5.4 ns on MJD = 52936.17 Time step of UTC(SU) of +160 ns on MJD 53369.00 due to changing of clock intercomparison system on 2006 March 21, MJD 53815, proper time steps have been introduced to ensure clock readings continuity. Obvious time step in cloks readings at MJD 55069 is due to replace of time comparison system and inevitable change of cable’s length. : Link with PTB by GLONASS common-view. Please be advised that GPS/GLO TTS3 receiver internal delay   have been changed by 10.2 ns (from INT DLY = -34.60 ns (GPS) to INT DLY = -24.40 ns (GPS)) on MJD= 55375  08 H 10 M UTC in compliance with result of last year receiver calibration campaign. TCC . Apparent time step of [UTC-UTC(TCC)] of about 8500 ns on MJD 53369. Time step of UTC(TCC) of +3000 ns on MJD 54321. The Agilent 5071A cesium standard (BIPM# 1351881) is now used as master clock. : Time step of UTC(TCC) of +350 ns on MJD 54983.64. : Apparent time step of UTC(TCC) of +82.1 ns on MJD 55591.0 due to calibration. : Time step of UTC(TCC) of +1300 ns on MJD 55621.54. due to a problem with our Efos24 maser, I had to change the external reference frequency of the polarx2 time link. Since mjd 55763 the polarx2 receiver is connected to the external reference frequency of Efos20 maser. TL . Apparent time step of UTC-UTC(TL) between MJD = 51179 and MJD = 51184 due to change of GPS receiver setup. Change of master clock on MJD 51742 and MJD = 52184. Change of master clock on MJD 52454.00 Change of master clock on MJD = 52778.04 Apparent Time step of UTC(TL) of -59 ns on MJD 53493.99 and of 5 ns on MJD 53508.99 due to changes in the time link Change of master clock on MJD 54871. Due to the unstable of the output frequency of H-maser HM6052, We change the frequency reference of our Micro-phase-stepper into HM6053 at MJD 55063 UTC 5:30 Change of reference source of UTC(TL) from HM6053 into HM6052 : Change of master clock on MJD 55349. We changed the reference clock of UTC(TL) from HM6052 into HM0057 at MJD 55959 (UTC 2012.02.02 00:30). : Change of master clock on MJD 55959.02. TP . Change of master clock between MJD = 51024 and MJD = 51029. Change of master clock on MJD = 52870, new clock is 1350326 Due to malfunction of our master clock #1350326, a large time error in UTC(TP) against UTC has been accumulated since MJD 53463. Therefore on MJD 53478 at 13:08 UTC we advanced UTC(TP) by 165.3 ns. Since then UTC(TP) is being derived from the clock #1351227. The operation of the 1350326 clock was discontinued on MJD 53479. The clock was sent for repair to Agilent. Change of master clock on MJD 53478. Since MJD 53660 11:33 UTC the UTC(TP) scale is being generated from 3249A00326 clock. The cesium tube of the 3608A01227 clock is out of cesium and therefore we cease sending its data temporarily. Change of master clock on MJD 53660.5. Change of master clock on MJD 53720. Since MJD 53887 12:35 UTC, the UTC(TP) scale is being generated from the 3249A00326 clock. Change of master clock on MJD 53887.52. Since MJD 54004 11:42 UTC, the UTC(TP) scale is being generated from the 3608A01227 clock Phase jump of 1525 ns (delay) in our sn1227 clock from which the UTC(TP) is being derived. The jump occurred on MJD 54707.8952 and was corrected on MJD 54710.2910. On Friday October 9 at 14:00 UTC (MJD 55113) we applied GPS P1 and P2 delay corrections in our GTR50 (TP04) receiver. : Time step of UTC(TP) of -16 ns on MJD 55113.58 due to change of calibration. TUG . Time step of UTC(TUG) of +9000 ns on MJD = 50903.5 Change of master clock on MJD = 51123.0 Time step of UTC(TUG) of -4614 ns on MJD = 51170.25 Frequency step of UTC(TUG) of -12.58 ns/d on MJD = 51170.25 Apparent time step of UTC - UTC(TUG) of -23 ns between MJD = 51359 and MJD = 51364 due to introduction of calibrated two-way link. UA . : National Science Center "Institute of Metrology", Kharkov - Ukraine. Frequency correction in UTC(UA) MJD 54903,00 Df/f[UTC(UA)new – UTC(UA)old] = - 2·10-14 Frequency correction in UTC(UA) on MJD 54933,00 Df/f[UTC(UA)new – UTC(UA)old] = 2?10-14 11 July 2009 (MJD 55023) 00 UTC the frequency correction in UTC(UA) was made: MJD 55023,00 Df/f[UTC(UA)new – UTC(UA)old] = - 2*10-14 Time correction of UTC(UA) On 16 August 2009 (MJD 55059) 00 UTC: MJD 55059,00 UTC(UA)new – UTC(UA)old = -100 nS : Time step of UTC(UA) of -100 ns on MJD 55059. Time correction of UTC(UA) was made on 5 October 2009 09 UTC (MJD 55109,375). MJD 55109.375 UTC(UA)new – UTC(UA)old = -100 ns. : Time step of UTC(UA) of -100 ns on MJD 55109.38. Frequency correction in UTC(UA)MJD 55203,00 Df/f[UTC(UA)new – UTC(UA)old] = - 4x10-14 Frequency correction in UTC(UA) on MJD 55263,00 Df/f[UTC(UA)new – UTC(UA)old] = + 2?10-14 June 6 2010 (MJD 55353.00) the frequency correctiion in UTC(UA) was made: MJD 55353.00 Df/f[UTC(UA)new – UTC(UA)old] = + 5x10-14 September 4 2010 (MJD 55443.00) the frequency correction in UTC(UA) was made: MJD 55443,00 Df/f[UTC(UA)new – UTC(UA)old] = – 3x10-14 Time step of UTC(UA) of -100 ns on MJD 55473.00 was made. : Time step of UTC(UA) of +100 ns on MJD 55473.0. : Time step of UTC(UA) of -100 ns on MJD 55433.0. UME . Apparent time step of UTC-UTC(UME) of about +200 ns between MJD = 50969 and MJD = 50974 . Apparent time step of UTC-UTC(UME) between MJD = 51679 and MJD = 51684. Apparent time step of [UTC-UTC(UME)] due to change of GPS antenna coordinates on MJD 53352. Time step of UTC(UME) between MJD 53884.0 and 53889.0 due to master clock change. Added frequency offset 4.2E-14 and time offset 1.070us to atomic clock 252 on MJD 54327. Change of reference Cs atomic clock (S/N: 251) with the another (S/N:872) since its Cs tube was on finishing on MJD54907. So we couldn't send its clock data until new Cs tubes are purchased. The GPS Data file for new reference clock (S/N: 872) will be continued to send. : Change of master clock on MJD 54907. : Apparent time step of UTC(UME) of about +1440 ns on MJD 55929.54. USNO. Maser 1400712 experienced a step in phase on MJD 53436, so it is not included in this report. Maser 1400708 was shipped out for repair on MJD 53913. Data until that time are included in this report. Maser 1400715 was moved to replace maser 1400708 on MJD 53913. There is a phase step and small frequency change associated with the move. For this reason the last data point (53914) is excluded from this report. Maser 1400704 showed a step of approximtely 60 ns on MJD 53957. The clock never lost lock, and it appears to not have undergone a frequency change of note. The USNO ITU-R data between MJD 54693 and MJD 54705 have been corrected for the replacement of our modem. VMI . Vietnam Metrology Institute, Ha Noi - Vietnam. VSL . Time step of UTC(VSL) of about - 15 ns between MJD = 51284 and MJD = 51289. Change of master clock on MJD = 51366.49 Change of master clock on MJD = 52366.33 Frequency steps of UTC(VSL) in ns/d : MJD Freq. step MJD Freq. step 50814.6 +1.728 51406.63 -4.320 50876.4 -0.864 51451.44 +1.728 50946.4 +0.864 51477.46 -0.864 51131.4 +2.592 51500.71 -0.864 51232.64 -2.592 51627.70 -0.864 51330.65 +0.864 51738.33 +0.432 The rate of UTC(VSL)has intentionally been changed on June 9, MJD 53165 at 08:00 UTC by -11E-15 (= 0.933 ns/d) by changing a microstepper from advance 166E-15 to advance 155E-15. This has been done to bring UTC(VSL) closer to UTC. n August 18, 2004, MJD 53235, at 15 h UTC, the rate of UTC(VSL) has been decreased by 0E-15 by means of changing the setting of a microstepper from advance 155E-15 to 135E-15. his is done to bring UTC(VSL) closer to UTC. hanged masterclock for UTC(VSL) from C0548 to C0456 on MJD53283 12.10 TC (5 october) New value ustepper advance 0,198 ps/s Apparent time step of [UTC-UTC(VSL)] of -11.7 ns on MJD 53353 due to TW calibration. No data available between MJD 53479 - 53489 due to laboratory move to a new place. On 14 July, MJD 53565, at 07:15 UTC the rate of UTC(VSL) has been increased by 0.475 E-13 (= 4.104 ns/d) by changing the fractional frequency offset of a phase microstepper from +2.314 E-13 to +2.789 E-13. This phase microstepper remains connected to clock 350731. The change is done to bring UTC(VSL) closer to UTC. On MJD 53584 the 1350179 stopped working. The unit is sent to Agilent to replace the cesium tube. On MJD 53718, at 17:00 UTC the rate of UTC(VSL) has been decreased by 0.270 E-13 (= 2.33 ns/d) by changing the fractional frequency offset of a phase microstepper from +2.395 E-13 to +2.123 E-13. This phase microstepper remains connected to clock 350731. The change is to bring UTC(VSL) closer to UTC. On MJD 53731 at 09:00 UTC the rate of UTC(VSL) has changed to new settings of the microsteper 2.404 E-13 to stop correction. On MJD 53789 no data due to computer failure. On MJD 53796, at 7:05 UTC the rate of UTC(VSL) has been decreased by 0.2315 E-13 (= 2 ns/d) by changing the fractional frequency offset of a phase microstepper from +2.4039 E-13 to +2.1724 E-13. This phase microstepper remains connected to clock 350731. The change is to bring UTC(VSL) closer to UTC. On MJD 53802, at 7:10 UTC the rate of UTC(VSL) has been changed by 0.927 E-13 (= 8 ns/d) by changing the fractional frequency offset of a phase microstepper from +2.1724 E-13 to +3.1 E-13. The correction of MJD 53796 had a calculation error. The correction was in the wrong direction. On MJD 53816 the rate of UTC(VSL) has been change by 5.74 E-14 (4.96 ns/) to 2.526 E-13. To end corretion to bring UTC(VSL) closer to UTC.The master clock remains 350731. On MJD 54070, at 6:30 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +2.526 E-13 to +2.454 E-13. This phase microstepper remains connected to clock 350731. The change is to bring UTC(VSL) closer to UTC. On MJD 54112, at 6:30 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +2.454 E-13 to +2.222 E-13. On MJD 54116, at 6:30 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +2.222 E-13 to +2.686 E-13. On MJD 54123, at 6:00 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +2.686 E-13 to +3.611 E-13. On MJD 54124, at 6:15 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +3.686 E-13 to +2.000 E-13.This phase microstepper remains connected to clock 350731.The change is to bring UTC(VSL) closer to UTC. On MJD 54150, at 8:10 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +2.000 E-13 to +2.373 E-13. The change is to stop the correction to bring UTC(VSL) closer to UTC. On MJD 54536, at 6:00 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +2.4 E-13 to +1.822 E-13. On MJD 54556, at 6:20 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +1.822 E-13 to +2.424 E-13.This phase microstepper remains connected to clock 350731. The change is to bring UTC(VSL) closer to UTC. On MJD 54570, at 11:00 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +2.424 E-13 to +1.857 E-13. This phase microstepper remains connected to clock 350731. The change is to bring UTC(VSL) closer to UTC. On MJD 54592, at 05:00 UTC the rate of UTC(VSL) has been changed. The frequency offset of a phase microstepper from +1.857 E-13 to +2.018 E-13. This phase microstepper remains connected to clock 350731. The change is to bring UTC(VSL) closer to UTC. Microstepper setting changes: This phase microstepper remains connected to clock 350731 On mjd 54663 TWSTFT the modem was changed from Mitrex to Satre.This could give a jump in data TW PTB-VSL Link due to delay changes calculation. Microstepper setting changes: mjd 54703, 05:30:00 utc, from 2.316E-13 to 2.074E-13. Microstepper setting change on mjd 54801 15:00:00 utc from 2.169E-13 to 2.478E-13 Microstepper setting change: mjd utc from to 54838 15:00:00 2.478E-13 2.200E-13 54847 13:15:00 2.200E-13 2.123E-13 in the fractional frequency offset of the phase microstepper. On MJD 54938 at 6:30 UTC from +2.123E-13 Hz/Hz to +1.310E-13 Hz/Hz. On MJD 54944 at 9:40 UTC from +1.310E-13 Hz/Hz to +0.810E-13 Hz/Hz. The microstepper remains connected to 1350731. From MJD 54790 to MJD 54980, 1350179 has been out of the laboratory for repair. From MJD54980 at 12:30 UTC it is back in operation.To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed:on MJD 54979 at 13:00 UTC from +0.810E-13 Hz/Hz to +1.240E-13 Hz/Hz. The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55004 at 07:07 UTC from +1.240E-13 Hz/Hz to +1.505E-13 Hz/Hz on MJD 55011 at 12:00 UTC from +1.505E-13 Hz/Hz t0 +2.265E-13 Hz/Hz. The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55026 at 12:00 UTC from +2.265E-13 Hz/Hz to +2.279E-13 Hz/Hz on MJD 55036 at 12:00 UTC from +2.279E-13 Hz/Hz to +2.137E-13 Hz/Hz. The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55057 at 12:00 UTC from +2.137E-13 Hz/Hz to +1.820E-13 Hz/Hz The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55076 at 12:00 UTC from +1.820E-13 Hz/Hz to +2.062E-13 Hz/Hz on MJD 55096 at 12:00 UTC from +2.062E-13 Hz/Hz to +2.306E-13 Hz/Hz The microstepper remains connected to 1350731. Some information on changes in the rate of the micro phase stepper that drives UTC(VSL). To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55106 at 12:00 UTC from +2.306E-13 Hz/Hz to +1.733E-13 Hz/Hz On MJD 55113 at 13:40 UTC from +1.733E-13 Hz/Hz to +2.156E-13 Hz/Hz On MJD 55131 at 12:00 UTC from +2.156E-13 Hz/Hz to +1.908E-13 Hz/Hz The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55146 at 12:00 UTC from +1.908E-13 Hz/Hz to +2.476E-13 Hz/Hz on MJD 55151 at 12:00 UTC from +2.476E-13 Hz/Hz to +2.245E-13 Hz/Hz The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55166 at 12:00 UTC from +2.245E-13 Hz/Hz to +2.164E-13 Hz/Hz on MJD 55176 at 12:00 UTC from +2.164E-13 Hz/Hz to +1.895E-13 Hz/Hz on MJD 55186 at 12:00 UTC from +1.895E-13 Hz/Hz to +2.285E-13 Hz/Hz on MJD 55196 at 12:00 UTC from +2.285E-13 Hz/Hz to +1.514E-13 Hz/Hz The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55231 at 12:00 UTC from +2.089E-13 Hz/Hz to +1.739E-13 Hz/Hz on MJD 55246 at 12:00 UTC from +1.739E-13 Hz/Hz to +1.787E-13 Hz/Hz on MJD 55251 at 12:00 UTC from +1.787E-13 Hz/Hz to +1.929E-13 Hz/Hz The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55295 at 12:00 UTC from +2.160E-13 Hz/Hz to +2.090E-13 Hz/Hz on MJD 55306 at 13:30 UTC from +2.090E-13 Hz/Hz to +2.156E-13 Hz/Hz on MJD 55312 at 06:30 UTC from +2.156E-13 Hz/Hz to +2.310E-13 Hz/Hz The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase- microstepper has been changed: on MJD 55320 at 12:00 UTC from +2.310E-13 Hz/Hz to +2.376E-13 Hz/Hz on MJD 55326 at 12:00 UTC from +2.376E-13 Hz/Hz to +2.407E-13 Hz/Hz on MJD 55336 at 14:00 UTC from +2.407E-13 Hz/Hz to +2.744E-13 Hz/Hz on MJD 55341 at 12:00 UTC from +2.744E-13 Hz/Hz to +2.247E-13 Hz/Hz The microstepper remains connected to 1350731. On MJD 55331 at 22:05 UTC there has been an interruption of the electric line power for about 2 hours. Both the TWSTFT system and the GPS receiver have continued to measure. So far, we have not seen any strange results in the measurements, but we noticed that the 1 pps output of the GPS receiver has made some jumps during the following days. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55351 at 12:00 UTC from +2.247E-13 Hz/Hz to +2.200E-13 Hz/Hz on MJD 55356 at 13:07 UTC from +2.200E-13 Hz/Hz to +2.305E-13 Hz/Hz on MJD 55361 at 12:00 UTC from +2.305E-13 Hz/Hz to +2.478E-13 Hz/Hz on MJD 55371 at 12:00 UTC from +2.478E-13 Hz/Hz to +2.281E-13 Hz/Hz on MJD 55376 at 12:00 UTC from +2.281E-13 Hz/Hz to +2.369E-13 Hz/Hz The microstepper remains connected to 1350731. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55386 at 12:00 UTC from +2.369E-13 Hz/Hz to +2.424E-13 Hz/Hz on MJD 55391 at 12:00 UTC from +2.424E-13 Hz/Hz to +2.532E-13 Hz/Hz on MJD 55406 at 12:00 UTC from +2.532E-13 Hz/Hz to +2.028E-13 Hz/Hz The microstepper remains connected to 1350731. On MJD 55392 the Cs-tube of 1350456 reached the end of its lifetime. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55411 at 12:00 UTC from +2.028E-13 Hz/Hz to +2.187E-13 Hz/Hz on MJD 55421 at 12:00 UTC from +2.187E-13 Hz/Hz to +2.324E-13 Hz/Hz on MJD 55426 at 12:00 UTC from +2.324E-13 Hz/Hz to +2.442E-13 Hz/Hz The microstepper remains connected to 1350731. On MJD 55392 the Cs-tube of 1350456 has reached the end of its lifetime. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55441 at 12:20 UTC from +2.442E-13 Hz/Hz to +2.370E-13 Hz/Hz The microstepper was connected to 1350731 until MJD 55446 at 11:00 UTC. From MJD 55446 at 11:30 UTC the microstepper is connected to 1350548. (During the change of the master clock, the UTC(VSL) timescale was maintained by the back-up system, which is composed of the back-up master clock 1350179 and another phase microstepper.) On MJD 55446 at 11:30 UTC, the fractional frequency offset of the phase microstepper is set to: +0.000E-13 Hz/Hz. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55448 at 07:00 UTC from +0.000E-13 Hz/Hz to +3.042E-13 Hz/Hz on MJD 55461 at 12:00 UTC from +3.042E-13 Hz/Hz to +2.942E-13 Hz/Hz. On MJD 55392 the Cs-tube of 1350456 has reached the end of its lifetime. This clock is now being repaired. : Change of master clock on MJD 55446.48. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55476 at 12:00 UTC from +2.942E-13 Hz/Hz to +2.692E-13 Hz/Hz on MJD 55481 at 12:00 UTC from +2.692E-13 Hz/Hz to +2.727E-13 Hz/Hz on MJD 55491 at 12:00 UTC from +2.727E-13 Hz/Hz to +2.630E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55392 the Cs-tube of 1350456 has reached the end of its lifetime. This Clock is being repaired. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: on MJD 55501 at 12:00 UTC from +2.630E-13 Hz/Hz to +2.692E-13 Hz/Hz on MJD 55511 at 12:00 UTC from +2.692E-13 Hz/Hz to +2.693E-13 Hz/Hz on MJD 55516 at 12:00 UTC from +2.693E-13 Hz/Hz to +2.675E-13 Hz/Hz on MJD 55526 at 12:00 UTC from +2.675E-13 Hz/Hz to +2.751E-13 Hz/Hz. The microstepper remains connected to 1350548. On MJD 55392 the Cs-tube of 1350456 has reached the end of its lifetime. This Clock is being repaired. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55531 at 12:30 UTC from +2.751E-13 Hz/Hz to +2.755E-13 Hz/Hz On MJD 55536 at 12:00 UTC from +2.755E-13 Hz/Hz to +2.707E-13 Hz/Hz On MJD 55546 at 12:00 UTC from +2.707E-13 Hz/Hz to +2.788E-13 Hz/Hz On MJD 55551 at 09:00 UTC from +2.788E-13 Hz/Hz to +2.784E-13 Hz/Hz On MJD 55561 at 12:00 UTC from +2.784E-13 Hz/Hz to +2.854E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55566 at 12:05 UTC from +2.854E-13 Hz/Hz to +2.736E-13 Hz/Hz On MJD 55571 at 12:05 UTC from +2.736E-13 Hz/Hz to +2.672E-13 Hz/Hz On MJD 55581 at 11:57 UTC from +2.672E-13 Hz/Hz to +2.674E-13 Hz/Hz On MJD 55586 at 12:00 UTC from +2.674E-13 Hz/Hz to +2.683E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55392 the Cs-tube of 1350456 has reached the end of its lifetime. This Clock is being repaired. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55596 at 12:00 UTC from +2.683e-13 Hz/Hz to +2.725E-13 Hz/Hz On MJD 55601 at 12:00 UTC from +2.725E-13 Hz/Hz to +2.710E-13 Hz/Hz On MJD 55606 at 12:10 UTC from +2.710E-13 Hz/Hz to +2.672E-13 Hz/Hz On MJD 55616 at 12:10 UTC from +2.672E-13 Hz/Hz to +2.645E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55621 at 12:00 UTC from +2.645E-13 Hz/Hz to +2.757E-13 Hz/Hz On MJD 55631 at 12:00 UTC from +2.757E-13 Hz/Hz to +2.734E-13 Hz/Hz On MJD 55636 at 12:00 UTC from +2.734E-13 Hz/Hz to +2.694E-13 Hz/Hz On MJD 55641 at 12:00 UTC from +2.694E-13 Hz/Hz to +2.740E-13 Hz/Hz On MJD 55651 at 12:00 UTC from +2.740E-13 Hz/Hz to +2.689E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55392 the Cs-tube of 1350456 has reached the end of its lifetime. This Clock is being repaired. ZA . To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55656 at 12:00 UTC from +2.689E-13 Hz/Hz to +2.637E-13 Hz/Hz On MJD 55666 at 12:00 UTC from +2.637E-13 Hz/Hz to +2.803E-13 Hz/Hz On MJD 55671 at 12:00 UTC from +2.803E-13 Hz/Hz to +2.731E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55665 the 1350456 has been restarted after replacement of the Cs tube. If the behaviour is stable it will be included in the report from May 2011. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55685 at 12:08 UTC from +2.731E-13 Hz/Hz to +2.648E-13 Hz/Hz On MJD 55691 at 12:00 UTC from +2.648E-13 Hz/Hz to +2.614E-13 Hz/Hz On MJD 55701 at 12:00 UTC from +2.614E-13 Hz/Hz to +2.717E-13 Hz/Hz On MJD 55706 at 12:05 UTC from +2.717E-13 Hz/Hz to +2.775E-13 Hz/Hz On MJD 55711 at 12:00 UTC from +2.775E-13 Hz/Hz to +2.672E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55721 at 12:05 UTC from +2.672E-13 Hz/Hz to +2.615E-13 Hz/Hz On MJD 55726 at 13:15 UTC from +2.615E-13 Hz/Hz to +2.767E-13 Hz/Hz On MJD 55736 at 12:00 UTC from +2.767E-13 Hz/Hz to +2.694E-13 Hz/Hz On MJD 55741 at 12:00 UTC from +2.694E-13 Hz/Hz to +2.711E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55731, the lifetime of the Cs-tube of 1350731 has ended. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55776 at 12:00 UTC from +2.593E-13 Hz/Hz to +2.636E-13 Hz/Hz On MJD 55781 at 12:18 UTC from +2.636E-13 Hz/Hz to +2.687E-13 Hz/Hz On MJD 55791 at 12:00 UTC from +2.687E-13 Hz/Hz to +2.670E-13 Hz/Hz On MJD 55796 at 12:05 UTC from +2.670E-13 Hz/Hz to +2.653E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55816 at 12:30 UTC from +2.653E-13 Hz/Hz to +2.681E-13 Hz/Hz On MJD 55826 at 12:00 UTC from +2.681E-13 Hz/Hz to +2.479E-13 Hz/Hz On MJD 55831 at 12:00 UTC from +2.479E-13 Hz/Hz to +2.498E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55731, the lifetime of the Cs-tube of 1350731 has ended. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55841 at 12:00 UTC from +2.498E-13 Hz/Hz to +2.676E-13 Hz/Hz On MJD 55846 at 12:00 UTC from +2.676E-13 Hz/Hz to +2.728E-13 Hz/Hz On MJD 55851 at 12:05 UTC from +2.728E-13 Hz/Hz to +2.636E-13 Hz/Hz On MJD 55861 at 12:00 UTC from +2.636E-13 Hz/Hz to +2.644E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55731, the lifetime of the Cs-tube of 1350731 has ended. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55866 at 12:00 UTC from +2.644E-13 Hz/Hz to +2.649E-13 Hz/Hz On MJD 55876 at 12:05 UTC from +2.649E-13 Hz/Hz to +2.555E-13 Hz/Hz On MJD 55881 at 12:00 UTC from +2.555E-13 Hz/Hz to +2.779E-13 Hz/Hz On MJD 55886 at 12:00 UTC from +2.779E-13 Hz/Hz to +2.695E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55731, the lifetime of the Cs-tube of 1350731 has ended. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55896 at 12:00 UTC from +2.695E-13 Hz/Hz to +2.667E-13 Hz/Hz On MJD 55901 at 12:00 UTC from +2.667E-13 Hz/Hz to +2.661E-13 Hz/Hz On MJD 55911 at 12:00 UTC from +2.661E-13 Hz/Hz to +2.650E-13 Hz/Hz On MJD 55916 at 12:05 UTC from +2.650E-13 Hz/Hz to +2.707E-13 Hz/Hz On MJD 55925 at 12:00 UTC from +2.707E-13 Hz/Hz to +2.612E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55731, the lifetime of the Cs-tube of 1350731 has ended. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55931 at 11:30 UTC from +2.612E-13 Hz/Hz to +2.572E-13 Hz/Hz On MJD 55936 at 12:00 UTC from +2.572E-13 Hz/Hz to +2.628E-13 Hz/Hz On MJD 55951 at 12:05 UTC from +2.628E-13 Hz/Hz to +2.669E-13 Hz/Hz On MJD 55956 at 12:00 UTC from +2.669E-13 Hz/Hz to +2.668E-13 Hz/Hz The microstepper remains connected to 1350548. On MJD 55731, the lifetime of the Cs-tube of 1350731 has ended. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55966 at 12:00 UTC from +2.668E-13 Hz/Hz to +2.543E-13 Hz/Hz On MJD 55971 at 12:00 UTC from +2.543E-13 Hz/Hz to +2.625E-13 Hz/Hz On MJD 55981 at 12:00 UTC from +2.625E-13 Hz/Hz to +2.649E-13 Hz/Hz The microstepper remains connected to 1350548. From MJD 55960, 1350731 is back in operation after replacement of the Cs-tube. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 55991 at 12:00 UTC from +2.649E-13 Hz/Hz to +2.572E-13 Hz/Hz On MJD 56001 at 12:10 UTC from +2.572E-13 Hz/Hz to +2.691E-13 Hz/Hz On MJD 56006 at 12:00 UTC from +2.691E-13 Hz/Hz to +2.738E-13 Hz/Hz On MJD 56016 at 12:00 UTC from +2.738E-13 Hz/Hz to +2.613E-13 Hz/Hz The microstepper remains connected to 1350548. From MJD 55960, 1350731 is back in operation after replacement of the Cs-tube. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56021 at 12:02 UTC from +2.613E-13 Hz/Hz to +2.636E-13 Hz/Hz On MJD 56036 at 12:00 UTC from +2.636E-13 Hz/Hz to +2.620E-13 Hz/Hz On MJD 56041 at 12:00 UTC from +2.620E-13 Hz/Hz to +2.584E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56051 at 12:10 UTC from +2.584E-13 Hz/Hz to +2.691E-13 Hz/Hz On MJD 56056 at 12:00 UTC from +2.691E-13 Hz/Hz to +2.610E-13 Hz/Hz On MJD 56061 at 12:00 UTC from +2.610E-13 Hz/Hz to +2.613E-12 Hz/Hz On MJD 56071 at 13:25 UTC from +2.613E-13 Hz/Hz to +2.565E-13 Hz/Hz On MJD 56076 at 12:00 UTC from +2.565E-13 Hz/Hz to +2.629E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56086 at 12:00 UTC from +2.629E-13 Hz/Hz to +2.577E-13 Hz/Hz On MJD 56091 at 12:00 UTC from +2.577E-13 Hz/Hz to +2.619E-13 Hz/Hz On MJD 56096 at 12:00 UTC from +2.619E-12 Hz/Hz to +2.626E-13 Hz/Hz On MJD 56106 at 12:00 UTC from +2.626E-13 Hz/Hz to +2.526E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56111 at 12:05 UTC from +2.526E-13 Hz/Hz to +2.575E-13 Hz/Hz On MJD 56121 at 12:00 UTC from +2.575E-13 Hz/Hz to +2.542E-13 Hz/Hz On MJD 56126 at 12:05 UTC from +2.542E-13 Hz/Hz to +2.515E-13 Hz/Hz On MJD 56131 at 12:30 UTC from +2.515E-13 Hz/Hz to +2.532E-13 Hz/Hz On MJD 56135 at 12:15 UTC from +2.532E-13 Hz/Hz to +2.520E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56141 at 12:00 UTC from +2.520E-13 Hz/Hz to +2.481E-13 Hz/Hz On MJD 56146 at 12:00 UTC from +2.481E-13 Hz/Hz to +2.477E-13 Hz/Hz On MJD 56152 at 12:05 UTC from +2.477E-13 Hz/Hz to +2.566E-13 Hz/Hz On MJD 56156 at 12:15 UTC from +2.566E-13 Hz/Hz to +2.518E-13 Hz/Hz On MJD 56161 at 12:00 UTC from +2.518E-13 Hz/Hz to +2.461E-13 Hz/Hz On MJD 56166 at 12:00 UTC from +2.461E-13 Hz/Hz to +2.432E-13 Hz/Hz On MJD 56170 at 12:05 UTC from +2.432E-13 Hz/Hz to +2.486E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56176 at 12:00 UTC from +2.486E-13 Hz/Hz to +2.533E-13 Hz/Hz On MJD 56181 at 12:00 UTC from +2.533E-13 Hz/Hz to +2.647E-13 Hz/Hz On MJD 56191 at 12:00 UTC from +2.647E-13 Hz/Hz to +2.515E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56201 at 12:00 UTC from +2.515E-13 Hz/Hz to +2.493E-13 Hz/Hz On MJD 56211 at 12:00 UTC from +2.493E-13 Hz/Hz to +2.540E-13 Hz/Hz On MJD 56226 at 12:00 UTC from +2.540E-13 Hz/Hz to +2.586E-13 Hz/Hz On MJD 56231 at 12:00 UTC from +2.586E-13 Hz/Hz to +2.607E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56240 at 14:00 UTC from +2.607E-13 Hz/Hz to +2.598E-13 Hz/Hz On MJD 56245 at 12:05 UTC from +2.598E-13 Hz/Hz to +2.615E-13 Hz/Hz On MJD 56250 at 12:00 UTC from +2.615E-13 Hz/Hz to +2.591E-13 Hz/Hz On MJD 56261 at 12:05 UTC from +2.591E-13 Hz/Hz to +2.470E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56266 at 12:00 UTC from +2.470E-13 Hz/Hz to +2.556E-13 Hz/Hz On MJD 56271 at 12:00 UTC from +2.556E-13 Hz/Hz to +2.426E-13 Hz/Hz On MJD 56281 at 13:15 UTC from +2.426E-13 Hz/Hz to +2.512E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56296 at 12:00 UTC from +2.512E-13 Hz/Hz to +2.425E-13 Hz/Hz On MJD 56306 at 12:00 UTC from +2.425E-13 Hz/Hz to +2.475E-13 Hz/Hz On MJD 56316 at 12:40 UTC from +2.475E-13 Hz/Hz to +2.412E-13 Hz/Hz On MJD 56321 at 12:00 UTC from +2.412E-13 Hz/Hz to +2.296E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56356 at 12:00 UTC from +2.439E-13 Hz/Hz to +2.342E-13 Hz/Hz On MJD 56366 at 12:00 UTC from +2.342E-13 Hz/Hz to +2.412E-13 Hz/Hz On MJD 56376 at 12:00 UTC from +2.412E-13 Hz/Hz to +2.353E-13 Hz/Hz The microstepper remains connected to 1350548. To keep UTC(VSL) close to UTC, the fractional frequency offset of the phase microstepper has been changed: On MJD 56386 at 12:20 UTC from +2.353E-13 Hz/Hz to +2.548E-13 Hz/Hz On MJD 56391 at 12:00 UTC from +2.548E-13 Hz/Hz to +2.549E-13 Hz/Hz On MJD 56397 at 12:00 UTC from +2.549E-13 Hz/Hz to +2.439E-13 Hz/Hz On MJD 56401 at 11:25 UTC from +2.439E-13 Hz/Hz to +2.476E-13 Hz/Hz On MJD 56406 at 09:00 UTC from +2.476E-13 Hz/Hz to +2.413E-13 Hz/Hz On MJD 56411 at 12:00 UTC from +2.413E-13 Hz/Hz to +2.439E-13 Hz/Hz The microstepper remains connected to 1350548. ZA . Time step of UTC(CSIR) of -14700 ns on MJD = 51091.3021 Time step of UTC(CSIR) of approximately -10 microseconds on MJD = 52183.57 Time step of UTC(CSIR) of about -1260 ns on MJD = 52922.62 and change of master clock on MJD = 52925.28 Time step of UTC(CSIR) of -10300 ns on MJD 53559. Stands for Council for Scientific and Industrial Research, South Africa, formerly noted as CSIR. Please note that the data submitted from NMISA for UTC(ZA) contains a time step for MJD 54280 of approximately 10 us. The data submitted from NMISA for UTC(ZA) contains a time step for MJD 54280 of approximately 10 us. Time step of UTC(ZA) of -10000 ns on MJD 54280.42 On MJD 55670 at approximately 10:45 UTC, the following changes were made to UTC(ZA) Clock 1361821 were delayed by 25516.9 ns (Time step of -025516.9). UTC(ZA) was changed from clock 1361034 to clock 1361821. This resulted in a time step of UTC(ZA) of approximately 10 us. : Time step of UTC(ZA) of about -10 µs on MJD 55670.45 due to change of master clock. END . --- Notes.UTC