[daip] [!4536]: aips - SNSMO in VLMB mode sometimes breaks the relationship between phase(per IF) and delay

[Eric Greisen]

Eric Greisen updated #4536
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       Staff (Owner): Eric Greisen (was: -- Unassigned --)
                 Due: - Cleared - (was: 26 February 2014 07:14 PM)

SNSMO in VLMB mode sometimes breaks the relationship between phase(per IF) and delay
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           Ticket ID: 4536
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/4536
           Full Name: Michael Bietenholz
               Email: mbieten at yorku.ca
             Creator: User
          Department: AIPS Data Processing
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Response Overdue
            Priority: Default
                 SLA: NRAO E2E
      Template Group: Default
             Created: 19 February 2014 06:58 PM
             Updated: 24 February 2014 11:44 PM
      Resolution Due: 04 March 2014 07:14 PM (7d 19h 29m)



I do not understand this mode of SNSMO and will look in detail tomorrow.
To average the phases seems just wrong.  The phases reflect the delay
found (so that applying the delay gets each IF to the same average phase)
so your SN tables show a substantial phase rotation from IF 1 to 16.  If it
also averages rates, in sec/sec rather than Hz, it is also making a curious 
error.

I will examine SNPLT in the difference mode.

I suspect SNSMO is not a heavily tested task - but also I think I did change
FRING in its phase output to bring the IFs into alignment.

Try VLBI mode.

Eric




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