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View this ticket online: <a href="https://help.nrao.edu/app#app.tickets,t:39166" title="(#)" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">https://help.nrao.edu/app#app.tickets,t:39166</a>
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Daewon Kim <dwkim@mpifr-bonn.mpg.de> </td>
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Awaiting Agent
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Redhat 7-64bit
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Good day, I have a question about manual fringe fitting. Attached capture images are cross-power spectra of two scans of a single baseline KY-NN in a GMVA dataset after applying FRING:...
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<div>Good day, <br></div><div><br></div><div>I have a question about manual fringe fitting. Attached capture images are cross-power spectra of two scans of a single baseline KY-NN in a GMVA dataset after applying FRING: i.e., manual phase calibration with FRING 'aparm(5)=0'. Overall, all KY-NN scans are nicely calibrated like the attached "scan1.png". But, only some of the scans show phase offsets between IFs like the attached "scan2.png": IF 1,5 vs. IF 2,3,4,6,7,8.</div><div><br></div><div>It turned out that this occurs when I set the FRING parameter 'antennas' to have many antennas, for example, "antennas=0". If I use only the two antennas (antennas=KY,NN), then the phase offsets in scan2.png are gone. Actually, there are more than 12 antennas in this GMVA dataset and setting "antennas=0" in FRING works nicely all the other baselines/scans except a number of the KY-NN scans only. So, I am not sure why this happens and I would like to ask for your advice on this issue.</div><div><br></div><div>May I ask you any suggestions to solve this issue? Is there a way to align/smooth the phases over the IFs so that the phase jumps between IFs (like "scan2.png") can be removed?<br></div><div><br></div><div>Thank you.</div><div><br></div><div>Best, <br></div><div>Daewon</div><div><br></div><div><br></div>
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<strong>Attachments</strong>
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• <a href="https://help.nrao.edu/file.php/6280YXWCWNTBSQ6279795D7E292T/scan1.png?access_token=snh5bt-wtwekygzeh-409dd457a672180cbbc3e24ce6442fbf1bd8f5f8" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">scan1.png</a> (56.23 KB)
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• <a href="https://help.nrao.edu/file.php/6280RDCYANWYQK627979604E829T/scan2.png?access_token=snh5br-pkvpjytplu-cdbc6f718ff30d78a0daf0b87f684fc7aea257d9" style="color: #0065A3; font-family: Helvetica, Arial, sans-serif; font-weight: normal; padding: 0; margin: 0; text-align: left; line-height: 1.3; text-decoration: underline;">scan2.png</a> (71.33 KB)
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