[daip] [!12819]: AIPS - FITLD DOWEIGHT seems to affect visibility amplitudes as well as weights

[Michael Bietenholz]

Michael Bietenholz updated #12819
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FITLD DOWEIGHT seems to affect visibility amplitudes as well as weights
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           Ticket ID: 12819
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12819
                Name: Michael Bietenholz
       Email address: mbieten at yorku.ca
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 18 October 2018 11:27 AM
             Updated: 18 October 2018 11:27 AM
           Reply due: 22 October 2018 11:27 AM (4d 0h 0m)
      Resolution due: 14 July 2021 12:00 AM (999d 12h 33m)

The HLP suggests that FITLD:DOWEIGHT (31DEC18) will only affect weights, but running FITLD with DOWEIGHT=1 produced very low visibility x-corr and auto-corr amplitudes (auto-corr were ~250 nJy).  As a consequence ACCOR gets large gain corrections (2000x in my case). I think probably its a mistake in FITLD, but if its intended behaviour, then users should probably bewarned that they *must* run ACCOR since I don't think APCAL would pick up the large required gain correction.

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