| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| D040312.1 | SGP/MMCR/C1 - Reprocess: Incorrect units for "heights" field | sgpmmcrmomC1.b1 |
| D041005.2 | SGP/MMCR/C1 - Reprocessed: Corrupt CDF file | sgpmmcrmomC1.b1 |
| D050117.5 | SGP/MMCR/C1 - Loss of synchronization | sgpmmcrmomC1.00, sgpmmcrmomC1.b1, sgpmmcrspecC1.a0 |
| D050120.1 | SGP/MMCR/C1 - Instrument failure | sgpmmcrmomC1.b1, sgpmmcrmomC1.00, sgpmmcrspectraC1.a0 |
| D050222.2 | SGP/MMCR/C1 - Power supply failure | sgpmmcrmomC1.00, sgpmmcrmomC1.b1, sgpmmcrspectraC1.a0, sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1 |
| D050714.4 | SGP/MMCR/C1 - Poor cross polar isolation | sgpmmcrmomC1.b1 |
| D061229.1 | SGP/MMCR/C1 - TWTA Faulting | sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0, sgpmmcrmomC1.00 |
| D080324.1 | SGP/MMCR/C1 - Sensitivity Shift | sgpmmcrmomC1.b1 |
| D080421.2 | SGP/MMCR/C1 - Polarization Mode Problem | sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0 |
| D100826.1 | SGP/MMCR/C1 - Dual polarization modes discontinued | sgpmmcrmomC1.b1 |
| D101108.5 | SGP/MMCR/C1 - Noise Level Shift | sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0 |
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 09/09/2003 | 2116 | 03/01/2004 | 2359 |
| Subject: | SGP/MMCR/C1 - Reprocess: Incorrect units for "heights" field |
| DataStreams: | sgpmmcrmomC1.b1 |
| Description: | The "heights" field metadata indicates that units are "m AGL" (meters above ground level) when in fact the heights data are recorded in "m MSL" (meters above mean sea leavel). |
| Measurements: | sgpmmcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/26/2004 | 0000 | 02/26/2004 | 2359 |
| Subject: | SGP/MMCR/C1 - Reprocessed: Corrupt CDF file |
| DataStreams: | sgpmmcrmomC1.b1 |
| Description: | An isolated oddity in the ModeNum field of the sgpmmcrmomC1.b1 file for 2004.02.26 was identified. The following odd values appeared in the original cdf file, for 12 consecutive entries starting with profile 8611: 1047, -1, 14282, 20180, 8670, 3550, 8651, -29810, 30695, -1, 2030, 16183 The raw data were fine. This file was reprocessed on Sept 30, 2004. |
| Measurements: | sgpmmcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/16/2005 | 0000 | 01/16/2005 | 1700 |
| Subject: | SGP/MMCR/C1 - Loss of synchronization |
| DataStreams: | sgpmmcrmomC1.00, sgpmmcrmomC1.b1, sgpmmcrspecC1.a0 |
| Description: | During my daily review of the MMCR operaton, I noticed that the radar returns were out of synch with returns appearing all throughout the range gates. I remotely rebooted the MMCR and it returned to normal operation. |
| Measurements: | sgpmmcrmomC1.00:
sgpmmcrmomC1.b1:
sgpmmcrspecC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/16/2005 | 0015 | 02/15/2005 | 2100 |
| Subject: | SGP/MMCR/C1 - Instrument failure |
| DataStreams: | sgpmmcrmomC1.b1, sgpmmcrmomC1.00, sgpmmcrspectraC1.a0 |
| Description: | The receiver/modulator had a power supply that had failed. |
| Measurements: | sgpmmcrspectraC1.a0:
sgpmmcrmomC1.00:
sgpmmcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/16/2005 | 0030 | 02/11/2005 | 2115 |
| Subject: | SGP/MMCR/C1 - Power supply failure |
| DataStreams: | sgpmmcrmomC1.00, sgpmmcrmomC1.b1, sgpmmcrspectraC1.a0, sgparscl1clothC1.c1, sgparsclbnd1clothC1.c1 |
| Description: | A power supply failed in the MMCR's receiver. During the period of this DQR, the radar would appear to work but the calibration is probably incoorect during good portions of this time. The power supply was replaced and normal operation resumed at 2115 on 02/11/2005. |
| Measurements: | sgparsclbnd1clothC1.c1:
sgparscl1clothC1.c1:
sgpmmcrspectraC1.a0:
sgpmmcrmomC1.00:
sgpmmcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/15/2004 | 0000 | 08/27/2010 | 2100 |
| Subject: | SGP/MMCR/C1 - Poor cross polar isolation |
| DataStreams: | sgpmmcrmomC1.b1 |
| Description: | This last spring, Sergey Matrosov pointed out that the Circular Depolarization Ratio measurements on the SGP radar indicated the isolation between the co and cross channels was only about 15 dB. Typically isolation of 25-30 dB is expected for polarization measurements to be useful. We set about to see if we could identify the source of the poor isolation. Kevin Widener had purchased a custom built orthomode transducer and polarizer that hadn't gone through any previous testing and we decided to swap it out with an ETL unit that had shown good isolation in the past. Kevin performed the swap a couple of weeks back and this week the latest archive data was available to compare results between the OMTs. Results from two precipitating cloud conditions, where we looked below the melting layer, where we expect to find domination of spherical water droplets and therefore maximum values for cdr - the maximum isolation (CDR) appears to be about 17 dB. The results showed that the poor isolation is probably not due to the OMTs but rather to the antenna itself. |
| Measurements: | sgpmmcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 01/13/2007 | 1900 | 01/13/2007 | 2359 |
| 01/14/2007 | 0330 | 01/14/2007 | 1400 |
| 01/15/2007 | 0300 | 01/15/2007 | 1500 |
| 11/23/2006 | 1900 | 11/23/2006 | 2359 |
| 12/03/2006 | 0900 | 12/03/2006 | 2359 |
| 12/04/2006 | 1900 | 12/04/2006 | 2359 |
| 12/06/2006 | 0200 | 12/06/2006 | 2359 |
| 12/07/2006 | 1300 | 12/07/2006 | 1600 |
| 12/11/2006 | 0700 | 12/11/2006 | 2359 |
| 12/17/2006 | 0200 | 12/17/2006 | 2359 |
| 12/18/2006 | 0400 | 12/18/2006 | 2359 |
| 12/24/2006 | 0600 | 12/24/2006 | 2359 |
| 12/26/2006 | 0900 | 12/26/2006 | 1300 |
| 12/27/2006 | 1400 | 12/27/2006 | 1500 |
| 01/07/2007 | 1700 | 01/07/2007 | 1900 |
| 01/10/2007 | 1000 | 01/10/2007 | 1400 |
| 01/12/2007 | 1100 | 01/12/2007 | 1300 |
| 01/13/2007 | 0800 | 01/13/2007 | 1530 |
| Subject: | SGP/MMCR/C1 - TWTA Faulting |
| DataStreams: | sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0, sgpmmcrmomC1.00 |
| Description: | The MMCR transmitter (TWTA) has been having a low helix current fault. This results in the transmitter shutting down. However, the radar continues to collect data. The MMCR restarts the TWTA at 0000 each day, hence the 2359 end times for many of these intervals. |
| Measurements: | sgpmmcrmomC1.00:
sgpmmcrmomC1.b1:
sgpmmcrspecmomC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 02/21/2008 | 1930 | 02/26/2008 | 1500 |
| Subject: | SGP/MMCR/C1 - Sensitivity Shift |
| DataStreams: | sgpmmcrmomC1.b1 |
| Description: | There was a sensitivity shift on the MMCR during this period of time. Cycling the power cleared the problem. Do not use data. |
| Measurements: | sgpmmcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 04/17/2008 | 1400 | 04/23/2008 | 1445 |
| Subject: | SGP/MMCR/C1 - Polarization Mode Problem |
| DataStreams: | sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0 |
| Description: | The cross-polarization and co-polarization modes (6 and 5) were measuring cross-polarization only. This means that one of the control signals was not hooked up correctly. The signals were rerouted on 4/23/2008. The General Mode (mode 3) is a co-polarization channel and worked during this time period. The reason why we don't use the general mode all of the time is that the co-pol and cross-pol modes are temporally closer and make a better estimation of linear depolarization ratio. |
| Measurements: | sgpmmcrmomC1.b1:
sgpmmcrspecmomC1.a0:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 08/25/2010 | 1453 | 01/04/2011 | 1400 |
| Subject: | SGP/MMCR/C1 - Dual polarization modes discontinued |
| DataStreams: | sgpmmcrmomC1.b1 |
| Description: | During a heat spell, the MMCR shelter internal temperature approached 100 F after the air conditioner failed. Either the heat, or a UPS failure, caused a failure of the MMCR radar computer hard disk. I had a spare computer shipped from Barrow and installed it on 8.24.2010. I was unable to get the dual polarization modes working. With help from Coy Chanders (the software developer) and Ken Moran (the hardware developer), we were able to determine the problem was the spare was running an older version of Lap-XM. Since the MMCR will be upgraded in two months and the antenna (to be replaced in September and its cross-polarization isolation makes cross-polarization essentially worthless), I decided to eliminate the dual-polarization modes. Dual polarization will return with the MMCR upgrade in October. The MMCR was removed from service 20110104 to be replaced by the KAZR instrument. |
| Measurements: | sgpmmcrmomC1.b1:
|
| Start Date | Start Time | End Date | End Time |
|---|---|---|---|
| 10/19/2010 | 0245 | 10/21/2010 | 1700 |
| Subject: | SGP/MMCR/C1 - Noise Level Shift |
| DataStreams: | sgpmmcrmomC1.b1, sgpmmcrspecmomC1.a0 |
| Description: | The MMCR experienced an extreme noise level shift. Since we were not on-site to troubleshoot this problem, we are unable to pinpoint its actual cause but rebooting the system returned the MMCR to normal operation. We speculate that the problem is with one of the receiver protection switches latching in an isolated position. If this is what is happening, the problem can be in the switch itself, its driver, or the timing circuitry controlling the driver. This error happens occasionally at all MMCRs but is more frequent at the SGP radar. |
| Measurements: | sgpmmcrmomC1.b1:
sgpmmcrspecmomC1.a0:
|