Eric Greisen updated #16786
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the frequency configurations from the AIPS ASDMList and the CASA listadm
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Ticket ID: 16786
URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/16786
Name: Aiyuan Yang
Email address: ayyang at mpifr-bonn.mpg.de
Creator: User
Department: AIPS Data Reduction
Staff (Owner): Eric Greisen
Type: Issue
Status: Open
Priority: Default
SLA: NRAO E2E
Template group: Default
Created: 21 August 2020 02:30 AM
Updated: 23 September 2020 09:45 AM
Reply due: 25 September 2020 03:00 AM (1d 17h 15m)
Resolution due: 17 May 2023 05:00 PM (966d 7h 15m)
I do not know what you are doing here so it is hard to comment. It is not normal to run FRING on all times with VLA data. The normal usage is to run it on one particularly good scan (averaged) and to then apply the SN table to all times in the CL table. I agree that it looks odd that you get the identical delays after ani initial startup time - but 10s of picoseconds variation is essentially nothing. I am assuming that you did apply CLCAL with each new SN table. Try UVPRT with each version of CL to see if the L polarization disappears with one version and then look for the cause. SN 3 should not cause L to be flagged when applied to the CL table. SNPLT on the CL table can be informative. Use DOTV true to avoid making such large PostScript files. I suggest that you read Chapter 4 of the CookBook which describes VLA data reduction in the modern era. It is available in your AIPS $AIPS_ROOT/TEXT/PUBL/COOK4.PS.
Eric Greisen.
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