[daip] [!7591]: AIPS - SNSMO and NORMALIZ

[Michael Bietenholz]

Michael Bietenholz updated #7591
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SNSMO and NORMALIZ
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           Ticket ID: 7591
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/7591
           Full Name: Michael Bietenholz
               Email: 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: 12 November 2015 10:22 AM
             Updated: 12 November 2015 10:22 AM
                 Due: 17 November 2015 12:00 AM (4d 13h 38m)
      Resolution Due: 21 November 2015 12:00 AM (8d 13h 38m)



I was confused by SNSMO's behaviour:  

NORMALIZ = 0:  it *does* change MGMOD
NORMALIZ = -1; it does *not* change MGMOD

In fact I think NORMALIZ=0 produces the same result as NORMALIZ=1, and to get a differen result
you need NORMALIZ=-1

I found this: where the GAINS are the values echoed by LISTR,OPTY='GAIN' for the amplitude gains
NORMALIZ=0:  MGMOD=1.1489363;  GAINS = 142032   85825
NORMALIZ=1:  MGMOD=1.1489363;  GAINS = 142032   85825  
NORMALIZ=-1: MGMOD=1.0047992;  GAINS = 162407   98136 


In the code I found this:

     DONORM = ((XNORM.EQ.0.0) .AND. (ABS (GMMOD-1.0).GT.1.0E-5)) .OR.
     *   (XNORM.GT.0.0)

Which suggests that normalization *is* turned on even if you ask for NORMALIZ=0 as long as GMMOD is not too close to unity.


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