[daip] [!9732]: AIPS - R-L delay calibration: rldly & crsfring

[Eric Greisen]

Eric Greisen updated #9732
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                 Due: - Cleared - (was: 01 February 2017 05:19 PM)

R-L delay calibration: rldly & crsfring
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           Ticket ID: 9732
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/9732
           Full Name: Yuri Kovalev
               Email: yyk at asc.rssi.ru
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 29 January 2017 03:17 PM
             Updated: 30 January 2017 08:40 PM
      Resolution Due: 07 February 2017 05:19 PM (7d 20h 38m)



Given that RLDLY works fine much of the time I do not know what to do with it
for you.  If you can make a data set before RLDLY but after the rest of the
calibration available - preferably not too large - I could experiment.  It looks
to me as if you simply lack S/N to get good solutions in the lower IFs and that you
get good solutions in IFs 5-8.  Have you considered having RLDLY combine IFs
into a smaller number of solutions?  Since you give me plots only after RLDLY I 
cannot judge whether that would be the thing to do.  For the VLA we often
combine IFs - either all or in halves - for better S/N.  The fact that you allow S/N
as low as 2 is a clue that you are mucking about in low S/N.

Eric Greisen




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