0000200: Peaks in the crosscorrelations in L-band observations

  

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ID Category Severity Reproducibility Date Submitted Last Update
0000200 [submission] 0.unknown/unspecified minor random 14-12-09 12:11 10-02-10 11:13
Reporter Gyula Jozsa View Status public  
Assigned To Gyula Jozsa
Priority normal Resolution open  
Status feedback  
Summary 0000200: Peaks in the crosscorrelations in L-band observations
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.
Additional Information The viewgraph shows crosscorrelations with RT3, phase and amplitude, in a recent observation of 3C147.
Attached Files  3C147.pdf [^] (463,562 bytes) 14-12-09 12:11

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- Notes
(0000255)
Hans van der Marel
10-02-10 11:13

Information is too limited. Please provide information about settings, type of observation, measurement sets.
The periodicity of the descibed feature is not well visible in the provided picture.
 

- Issue History
Date Modified Username Field Change
14-12-09 12:11 Gyula Jozsa New Issue
14-12-09 12:11 Gyula Jozsa File Added: 3C147.pdf
11-01-10 11:53 Harm Munk Status new => assigned
11-01-10 11:53 Harm Munk Assigned To  => Hans van der Marel
10-02-10 11:13 Hans van der Marel Note Added: 0000255
10-02-10 11:13 Hans van der Marel Assigned To Hans van der Marel => Gyula Jozsa
10-02-10 11:13 Hans van der Marel Status assigned => feedback