[daip] TVFLG reports INCORRECT PHASES (OLD/NEW/TST)

[Michael Rupen]

Hi Leonia,

  in fact they all have NON-blank calibrator codes, according to 
LISTR/SCAN.  If the calcodes were blank, TVFLG would show nothing (I've 
checked ;) rather than incorrectly-calibrated phases.

  In any case CALCODE='' gives the same problem.

  Cheers,

           Michael


 > michael,
> 
> As I understand TVFLG works when you list sources explicitely and does npt work 
> when you have SOURCE = '' and CALCODE '*'.
> CALCODE '*' means select sorces with with any non blank calibrator code.
> 
> I think that all your calibrators have blank calibrator codes.
> Can you check your SU table to see the calibrator codes?
> 
> Can you try CALCODE = '  '?
> 
> Thanks
> 
> Leonia
> 
> 
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> >From daip-admin at donar.cv.nrao.edu Sun Apr 27 10:53 MDT 2003
> From: Michael Rupen <mrupen at aoc.nrao.edu>
> To: daip at verdi.aoc.nrao.edu
> Subject: [daip] TVFLG reports INCORRECT PHASES (OLD/NEW/TST)
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> Dear DAIP,
> 
>   I have a very odd problem with TVFLG.  I have a typical VLA continuum
> uv-data set, 3.3s integrations, at 6cm.  This is one of the transient
> monitoring runs, so I've reduced these guys in the same fashion zillions of
> times without any trouble.   On this particular occasion, I happily went
> through initial flagging & calibration (TVFLG, SETJY, CALIB, GETJY, CLCAL),
> then went back into TVFLG to check that the calibrated amp. & phase look OK.
> This is where things got weird.  TVFLG claims phases up to 180d -- it looks
> like a few antennas are not calibrated for a few sources.  The amp. & the
> phase diffs. look fine.  Now I try to check the phases in UVPLT, one IF at a
> time -- they look spiffy!  OK, back to TVFLG, but now instead of just
> setting CALCODE '*' I explicitly list the calibrators with SOURCES.  Now all
> the phases look wonderful!!!  This is true in OLD, NEW, & TST.  I tried
> re-creating the NX table with INDXR, but got the same result.  I would have
> thought this had something to do with how TVFLG interpolates the CL table
> entries, but that doesn't make any sense:
>   * there are CL entries every 10s (yes, I checked this with LISTR), and I
>     have minute-ish scans, and the CL entries themselves change slowly and
>     smoothly (and not through 180d on the offending antennas)
>   * the phases shown in TVFLG are consistent for whole scans and even
>     across scan boundaries for a given source
> So I am very confused!
> 
> I've put the offending data set in
> 
>   /home/verdi/ar508_26apr03c.uvfits
> 
> if you'd like to have a look.  I run TVFLG as
> 
>   default tvflg
>   getn  <DATASET>
>   docal 2 ; gainuse 2 ; flagver 1 ; sour ''; docat -1
>   dparm 0 ; dparm(6) 3.3333333 ; dparm(3) 1
>   calcode '*'
> 
> which fails, and then add
>   sour '1331+305','17009-26109','17519-25240','1824+107',''
> which works -- despite the fact that it's 17009 & 17519 which give problems
> when I just rely on calcode '*'.
> 
> Thanks very much --
> 
>                Michael
> 
> p.s. I'm running on verdi, a Linux box.
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