[daip] [!14061]: AIPS - PCAL with SPECTRAL=1

[Lynn Matthews]

Lynn Matthews updated #14061
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PCAL with SPECTRAL=1
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           Ticket ID: 14061
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/14061
                Name: Lynn Matthews
       Email address: lmatthew at haystack.mit.edu
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 17 June 2019 02:16 PM
             Updated: 18 June 2019 11:41 AM
      Resolution due: 12 March 2022 07:00 PM (998d 8h 19m)

I tried again withICHANSEL=0, and the results suggest that having ICHANSEL non-zero when using smoothing is a verybad idea. The attached shows the original PD table (green) overplotted with the PD table generated with ICHANSEL=0 (yellow). They are identical across the inner band, but outside the ICHANSEL range both amplitude and phase show spurious jumps.In the case of spectral data with lots of channels, it seems that it would be better to be able to fit a smoother function (e.g., a low-order polynomial) rather than trying to smooth out the data before fitting. For now though I think I will ignore this correction given the narrow band.LynnLynn

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