[daip] [!11045]: AIPS - BB379 - amplitudes very low on EB

[Michael Bietenholz]

              Status: Open (was: Closed)

BB379 - amplitudes very low on EB
---------------------------------

           Ticket ID: 11045
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/11045
                Name: Michael Bietenholz
       Email address: mbieten at yorku.ca
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Amy Mioduszewski
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 25 September 2017 06:14 PM
             Updated: 03 October 2017 05:48 PM
           Reply due: 05 October 2017 05:49 PM (2d 0h 0m)
      Resolution due: 29 June 2020 12:00 AM (999d 6h 11m)

Hi Amy:

A curious thing about this is that there are non-closing delays on EB
baselines - attached is an example POSSM plot on the strong calibrator
3C345 of the baselines between BR,EB and HN.  Yellow is RR and green
is LL.  This is after fring-fitting just these three antennas.  Note
that the RR (yellow) delay, especially in IF 3,4,7 doesn't close
around this triangle, whereas the LL (green) one more or less does.
Visibility phases are pretty stable in time during this scan, so I
don't think its a time-averaging artefact.

What strikes me as odd here is that if its just EB screwing up data
wouldn't it *have* to close?   Source structure is a possibility
but seems unlikely to change the single-band delay significantly,
and should produce much the same effect in RR as in LL.

                   cheers,           michael



On Wed, 27 Sep 2017, Amy Mioduszewski wrote:

> 
> 
> Ticket ID: 11045
> Department: AIPS Data Reduction
> Status: Open
> 
> 

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