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| ID | Category | Severity | Reproducibility | Date Submitted | Last Update | ||||
| 0000392 | [DZB] 0.unknown/unspecified | major | sometimes | 27-01-12 15:22 | 14-05-12 12:25 | ||||
| Reporter | Yuan Tang | View Status | public | ||||||
| Assigned To | Juergen Morawietz | ||||||||
| Priority | normal | Resolution | open | ||||||
| Status | closed | ||||||||
| Summary | 0000392: The TP of Band2,6X is unstable, jumped up and down. | ||||||||
| Description | The TP of Band2,6X is unstable, jumped up and down. | ||||||||
| Additional Information |
on 18.1.2012 we localized a defective sampler unit. (See Issue 0000390) After replacement on ADC board, this channel seems to be instable. on 31.1.2012 I interchanged the filter, DDS and converterunits in the rack with band 3 of the same telescope and polarization. now testing whether the problem moves to band 3 or remains in band 2. Juergen, 1.2.2012 ---------------------------------------------------------------------- Problem has moved to band 3, so I replaced the filter- and the converterunit of band 3. The DDS was not replaced. status is 'resolved'. Juergen, 3.2.12 ---------------------------------------------------------------------- closed issue. Juergen 14.5.2012 ---------------------------------------------------------------------- |
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| nr subbands | 1 | ||||||||
| nr polarisations | |||||||||
| nr channels | |||||||||
| bandwidth | |||||||||
| multi-subarray | no | ||||||||
| recirculation | no | ||||||||
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Notes |
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(0000375) Yuan Tang 01-02-12 12:11 |
To track the problem of the TP unstable on Band2,6X, the units of LO,Filter,Converter on Band2,6X had been swapped with Band3,6X yesterday afternoon. Now the TP of Band3,6X is unstable. So the problem comes from the unit of LO, or Filter, or Converter in the IVC. |
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(0000378) Yuan Tang 02-02-12 16:05 |
The converter and filter units of Band3,6X has been replaced tis morning to solve the problem of unstable TP. |
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Issue History |
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| Date Modified | Username | Field | Change |
| 27-01-12 15:22 | Yuan Tang | New Issue | |
| 27-01-12 15:22 | Yuan Tang | nr subbands | => 1 |
| 27-01-12 15:22 | Yuan Tang | multi-subarray | => no |
| 27-01-12 15:22 | Yuan Tang | recirculation | => no |
| 27-01-12 15:23 | Yuan Tang | Assigned To | => Juergen Morawietz |
| 27-01-12 15:23 | Yuan Tang | Status | new => assigned |
| 01-02-12 08:55 | Juergen Morawietz | Status | assigned => testing |
| 01-02-12 08:55 | Juergen Morawietz | Additional Information Updated | |
| 01-02-12 08:58 | Juergen Morawietz | Additional Information Updated | |
| 01-02-12 12:11 | Yuan Tang | Note Added: 0000375 | |
| 01-02-12 12:11 | Yuan Tang | Status | testing => assigned |
| 02-02-12 16:05 | Yuan Tang | Note Added: 0000378 | |
| 02-02-12 16:05 | Yuan Tang | Status | assigned => resolved |
| 03-02-12 08:42 | Juergen Morawietz | Additional Information Updated | |
| 14-05-12 12:25 | Juergen Morawietz | Status | resolved => closed |
| 14-05-12 12:25 | Juergen Morawietz | Additional Information Updated | |
