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Ashish Kumar <ashiskmr@iitk.ac.in> </td>
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Awaiting Agent
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Hi, I am using a VLBA archive data set and need some help with FRING and CLCAL tasks. The data is stored in two idifits files, one file has all the calibrators (scan of Fringe Finder So...
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<div>Hi,</div><div>I am using a VLBA archive data set and need some help with FRING and CLCAL tasks. The data is stored in two idifits files, one file has all the calibrators (scan of Fringe Finder Source (FFS) and Phase Reference Source (PRS)), and the other has the target source. I have obtained bandpass (BP table) and fringe fitting (SN table) solutions using calibrators data set and copied the tables to the target data set using TACOP. Now, I have to apply the SN table to the target, setting the CALSOURCE adverb to PRS in CLCAL. It shows a warning, 'ALL SOURCES REJECTED BY SELECTION CRITERIA,' because PRS scans are not in the target data set, so I kept the CALSOURCE adverb blank. I am not sure it is okay to keep this adverb blank here.</div><div>Second, I ran FRING on the target itself, enabling fringe fitting and bandpass calibration (DOBAND 1 and DOCALIB 1), and faced a problem, mentioned below and infect, got lots of failed solutions.<br></div><div>I picked FD as a reference antenna.<br></div><div>=====================================================<br></div><div>FRING2: No path from REFANT to ANT # 4, blanking solution</div><div>FRING2: No path from REFANT to ANT # 5, blanking solution</div><div>FRING2: No path from REFANT to ANT # 6, blanking solution</div><div>FRING2: No path from REFANT to ANT # 7, blanking solution</div><div>FRING2: No path from REFANT to ANT # 9, blanking solution</div><div>FRING2: Time= 0/ 10 24 06, Polarization = 2</div><div>FRING2: Time= 0/ 10 24 34, Polarization = 1</div><div>FRING2: The data have partitioned into multiple disjoint</div><div>FRING2: subarrays. Must flag baselines with good solutions</div><div>FRING2: since phases cannot be joined. Try a lower SNR limit</div><div>FRING2: or APARM(9) = 0</div><div>FRING2: No path from REFANT to ANT # 3, blanking solution</div><div>FRING2: No path from REFANT to ANT # 5, blanking solution</div><div>FRING2: Time= 0/ 10 24 34, Polarization = 2</div><div>FRING2: Time= 0/ 10 25 02, Polarization = 1</div><div>FRING2: Time= 0/ 10 25 02, Polarization = 2</div><div>FRING2: Time= 0/ 10 25 30, Polarization = 1</div><div>FRING2: Time= 0/ 10 25 30, Polarization = 2</div><div>FRING2: Time= 0/ 10 25 58, Polarization = 1</div><div>FRING2: Time= 0/ 10 25 58, Polarization = 2</div><div>FRING2: Found 1061 good solutions</div><div>FRING2: Failed on 2019 solutions</div><div>FRING2: Adjusting solutions to a common reference antenna</div><div>================================================<br></div><div></div><div>Also, I need some help setting the SOLINT adverb. I checked the coherence time with the COHER task, it was around 0.236 min, so I set SOLINT 0.5 and SOLSUB 0.3. Is it okay, or should I put it slightly lower?</div><div><br></div><div>Regards,</div><div>Ashish<br></div><div><br></div><div><br></div><div></div>
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