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ID |
Category |
Severity |
Reproducibility |
Date Submitted |
Last Update |
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0000200 |
[submission] 0.unknown/unspecified |
minor |
random |
14-12-09 12:11 |
10-02-10 11:13 |
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Reporter |
Gyula Jozsa |
View Status |
public |
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Assigned To |
Gyula Jozsa |
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Priority |
normal |
Resolution |
open |
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Status |
feedback |
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Summary |
0000200: Peaks in the crosscorrelations in L-band observations |
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Description |
Several HI line calibrator measurements show a tendency for weak spikes turning up at -9 minute intervals in the crosscorrelations. This periodicity is seen in amplitude and phase. The problem has been persistent over a year. The hypothesis has been that this is a newly observed feature, but I have now found it in data from 2007, too.
The feature cannot clearly be tied down to a certain antenna or certain baselines. It turns up slightly differently in each measurement. Possibly, the MFFEs have to be tracked.
It is not yet clear how the feature influences the quality of data, since there are ways to take care of (parts) of it. |
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Additional Information |
The viewgraph shows crosscorrelations with RT3, phase and amplitude, in a recent observation of 3C147. |
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Attached Files |
 3C147.pdf [^] (463,562 bytes) 14-12-09 12:11 |
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