| DQR ID | Subject | Data Streams Affected |
|---|---|---|
| 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 |
|---|---|---|---|
| 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:
|