New maser frequency standard installed in Green Bank August 23, 2018 by Bryan Owings of Microsemi. Maser model MHM-2010, serial no: 0100000345
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1pps input | signal |
---|---|
X0 | Site 1Hz (from TRAK clock) |
X1 | CNS_GPS1 (1pps) |
X2 | CNS2018 (new CNS GPS receiver) |
X3 | CNS_GPS2 (1/100pps) |
X4 | MicroSem (1pps from new maser) |
Y0 | GBT_VLBA |
Y1 | RA (round trip to 140') |
Y2 | GBTRtn (round trip to GBT) |
Date | Synthesizer | Delta Synth | Offset MSM to GPS | Drift | Comments |
---|---|---|---|---|---|
2018 Aug 23 | 5751.6839098 | 0 | 1022ns | 0 | Initial synthesizer setting |
2018 Nov 29 | 5751.6837236 | -1862 | 2075ns | 0 | Adjust synthesizer by -1862 to match GPS rate. New Setting: 57516837236 |
2018 Nov 29 | ditto | 1115ns | 0 | Synchronize 1 pps to Site 1Hz | |
2018 Dec 6 | 5751.6840960 | +3724 | 1244 | 0 | Adjust synthesizer to put correction in with opposite sign to what was done Nov 29 |
2019 Apr 23 | 5751.6837960 | -3000 | -1223 | 0 | Adjust synthesizer to match GPS rate. |
2019 May 15 | 5751.6835560 | -2400 | -1533 | 0 | Adjust synthesizer to match GPS rate. |
2019 Sep 24 | 5751.6835560 | +52 | Put +52 dds/day drift correction in synthesizer screen on laptop; changed synth mode to external. | ||
2019 Sep 25 | 5751.6834500 | -1060 | -4300 | -52 | Change sign of drift correction, and decrease synthesizer by 1060. |
2019 Sep 26 | 5751.6833000 | -1446 | -4380 | -52 | Another decrease of synthesizer to start to approximate GPS rate. |
2019 Sep 27 | 5751.6831500 | -1500 | -4400 | -52 | Yet another decrease of synthesizer to approximate GPS rate. |
2019 Sep 30 | 5751.6830000 | -1500 | -4474 | -52 | Yet another decrease of synthesizer to approximate GPS rate. |
2019 Oct 02 | 5751.6827597 | -2300 | -4505 | -52 | Still another decrease of synthesizer to approximate GPS rate. |
2019 Dec 06 | 5751.6824217 | 0 | -4759 | -74 | Adjust drift correction by -22 counts. |
2019 Dec 12 | 5751.6822609 | -1175 | ~ 0 | -74 | Decrease synthesizer by 1175 counts; sync 1pps to GPS. |