[daip] [!11169]: AIPS - What is special the need in DPARM(7) in FRING?

[Evgeniya Kravchenko]

Evgeniya Kravchenko updated #11169
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What is special the need in DPARM(7) in FRING?
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           Ticket ID: 11169
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/11169
                Name: Evgeniya Kravchenko
       Email address: evgenia.v.kravchenko at gmail.com
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 25 October 2017 07:17 PM
             Updated: 25 October 2017 07:17 PM
           Reply due: 27 October 2017 07:17 PM (2d 0h 0m)
      Resolution due: 21 July 2020 03:00 AM (999d 7h 43m)

AIPS help recommends to keep bparm(7)>0 for polarization data, thus the phase, rate and delays will NOT be re-referenced to a common antenna. Applying the corresponding SN table in presence of antenna change, CLCAL re-references solutions to the common antenna.If we set bparm(7)=0, the FRING re-references solutions and CLCAL does nothing.In the end we have exactly the same results for these two cases (carefully checked on VLBI Q and U phase difference).As a result, we do not understand the need of this parameter.Moreover, if we set bparm(7)=0 for polarization observations, there is no need at all to care about common antenna change in further analysis.Is there special case in the taking care about this parameter for polarization observations?Thanks,Evgeniya

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