[daip] New Ticket - [!KKG-592163]: INDXR and VLA gaincurves: discrepancy between 31DEC11 & 31DEC12

[Michael Bietenholz]

New Ticket: INDXR and VLA gaincurves: discrepancy  between 31DEC11 & 31DEC12

The CL-table gains calculated by INDXR are significantly different depending on whether one uses the 31DEC11 or the 31DEC12 versions (binary distrib). They are using the same version of /home/AIPS/TEXT/IONS/VLA.GAINS so its not the text file.   In particular, the 31DEC12 version produces gains that are 5% higher for some antennas (e.g., ant 3,12,15) for my X-band data  set (2012Aug01)

I would have thought the X-band gain curve was pretty flat (this is at elev=40degs),  so I would guess that the 31DEC11 gain values are more reasonable (ie. +-1% or so).  Since both  versions of INDXR are working from the same VLA.GAINS file, it seems likely some error in the calculation rather than in the gain coefficients.

E.g. here are LISTR,OPTY=GAIN; INEXT=CL; DPARM=0 outputs  : 

Gain amplitudes, 1000 =    10.000000
Stokes = R    IF =  1 Freq =  8.055000000 GHz 
  Time   Source    --01--02--03--04--05--06--07--08--09--11--12--13--14--15--16

31DEC12
04:01:46.5 1331+305 101 101 105 104 103 100 101 103 101 103 105 102 104 105 101

31DEC11
04:01:46.5 1331+305 100 100 100 100 100 100 100 100  99 100 100 100 100 100 100
                                                      ^^^^                                                     ^^^^               ^^^^

Ticket Details
===================
Ticket ID: KKG-592163
Department: AIPS Data Processing
Priority: Default
Status: Open
Link:  https://help.nrao.edu/staff/index.php?_m=tickets&_a=viewticket&ticketid=2248