[daip] [!10702]: AIPS - Phase wraps 3C84

[Jared Rice]

Jared Rice updated #10702
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Phase wraps 3C84
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           Ticket ID: 10702
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/10702
           Full Name: Jared Rice
               Email: jrice at physics.unlv.edu
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 19 July 2017 10:09 PM
             Updated: 19 July 2017 10:09 PM
                 Due: 21 July 2017 10:09 PM (2d 0h 0m)
      Resolution Due: 27 July 2017 10:09 PM (8d 0h 0m)



Due to the age of my Macbook Pro I am using 31DEC15 AIPS with Mac
OS X 10.6.8. I am working on a VLBA observation from uz001a and
following the steps in Appendix C of the AIPS Cookbook. I have run
VLBALOAD, VLBAFIX, VLBAEOPS, VLBATECR, VLBACCOR and
VLBAPCOR. The phases on 3C84 after VLBAPCOR do not look to have
improved much.

The attached plot crpl-ccor-6cm-if3-5.ps shows the result from
VLBACRPL for a segment of the 3C84 data before the pulse-cal
calibration. After running VLBAPCOR the phases do not look
much better. They seem to wrap very rapidly. Attached plot
crpl-pcor-6cm-if3-5.ps shows that 3C84 still has very rapid phase
wraps.

Does this look reasonable to you? Would there be some problem
connected with using 31DEC15? I have also attached the tasav file
uz001a-6cm.tasav. For reference, VLBAEOPS is CL 2, VLBATECR is CL 3,
VLBACCOR is CL 4 and SN 1, and VLBAPCOR is CL 5 and SN 2.

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