[daip] [!14796]: AIPS - Unstable phases on the GBT

[James Miller-Jones]

James Miller-Jones updated #14796
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Unstable phases on the GBT
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           Ticket ID: 14796
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/14796
                Name: James Miller-Jones
       Email address: james.miller-jones at curtin.edu.au
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Amy Mioduszewski
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 17 September 2019 01:09 PM
             Updated: 25 September 2019 09:11 AM
      Resolution due: 19 June 2022 12:00 AM (997d 14h 48m)

Dear Amy,Thank you very much for your response.  I had a go at this, and was able to correct the GBT for part of one of the two affected epochs.  BS228E had pulse-cal data for GBT for the whole experiment, the delays derived from the PC data were very scattered (by +/-5ns) up until 07:53 UT (about three-quarters of the way through the experiment), at which point they stabilised to a reasonable steady value.  Applying the phase referencing solutions to my check source, I was able to get good results when including the GBT after 07:53, but not before that.For BS228F, on the other hand, there only appeared to be a single PC record for GB for the entire experiment, so no correction was possible.I assume that this is now as good as we will be able to do.  However, if it is possible to recover PC information from elsewhere (especially for BS228F), or if you know why the PC table should have shown these delay jumps for BS228E, then please let me know.Best regards,James

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