<font face="Verdana, Arial, Helvetica" size="2">Eric Greisen updated #16786<br />
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the frequency configurations from the AIPS ASDMList and the CASA listadm<br />
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<div style="margin-left: 40px;">Ticket ID: 16786</div>
<div style="margin-left: 40px;">URL: <a href="https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/16786">https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/16786</a></div>
<div style="margin-left: 40px;">Name: Aiyuan Yang</div>
<div style="margin-left: 40px;">Email address: <a href="mailto:ayyang@mpifr-bonn.mpg.de">ayyang@mpifr-bonn.mpg.de</a></div>
<div style="margin-left: 40px;">Creator: User</div>
<div style="margin-left: 40px;">Department: AIPS Data Reduction</div>
<div style="margin-left: 40px;">Staff (Owner): Eric Greisen</div>
<div style="margin-left: 40px;">Type: Issue</div>
<div style="margin-left: 40px;">Status: Open</div>
<div style="margin-left: 40px;">Priority: Default</div>
<div style="margin-left: 40px;">SLA: NRAO E2E</div>
<div style="margin-left: 40px;">Template group: Default</div>
<div style="margin-left: 40px;">Created: 21 August 2020 02:30 AM</div>
<div style="margin-left: 40px;">Updated: 23 September 2020 09:45 AM</div>
<div style="margin-left: 40px;">Reply due: 25 September 2020 03:00 AM (1d 17h 15m)</div>
<div style="margin-left: 40px;">Resolution due: 17 May 2023 05:00 PM (966d 7h 15m)</div>
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<p>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.</p>
<p>Eric Greisen.</p>
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