[daip] redundant data points from VLBA distribution file

Tue Feb 18 12:21:23 EST 2003

Michael,

May I ask you to run task prtuv with dparm(6)=1. This option 
allows to print out random parameter instead of visibilities.

In particular you can see subbarays there. May be the identical 
visibilities have diferent subarray or difference in something yet.

Leonia
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Subject: [daip] redundant data points from VLBA distribution file
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Status: RO

  I just noticed something wierd: there are redundant (doubled) data
points in my uv-data file.  The uv-file was loaded via FITLD from VLBA
distribution tapes, and I haven't done anything to it that should have
produced any additiona visibilities (UVCOP once to get rid of low
weights).  See UVPRT output below.  I could presumable get rid of
these by running UVAVG(OPCO=MERG) but it seemed odd that there were
any redundant data points.  They constitute only ~10^-5 of my data,
but they cause FIXWT (and possibly other things) to die.  Should I
worry?

       thanks,
            michael bietenholz

--- UVPRT output ----

File = GB042C C    .WTCLP .   1   Vol = 1    Userid = 1477     Channel =    1     IF =  1
Ref freq=  4.971552500 GHz  Ncor=  4  No. vis=      4528  Sort order= TB
U, V, W are in Kilo wavelengths at the reference frequency
Weights have been multiplied by     10.0000

Source M81      (    0)  RA   =  09 55 33.17  DEC  =  69 03 55.1
M81      Freq=  4.971552500 Sort= TB      1  RR          1  LL          1  RL          1  LR
   Time      Ant   U(Kilo)  V(Kilo)    Amp Phas Wt    Amp Phas Wt    Amp Phas Wt    Amp Phas Wt

 1/03:15:41  1- 5  -18712.   19234.   0.001  81 33   0.001 -87 33   0.001 148 33   0.000-123 33
 1/03:15:44  1- 5  -18715.   19230.   0.001 122 33   0.001 -28 33   0.000  86 33   0.000 128 33
>1/03:15:47  1- 5  -18717.   19227.   0.000  -9 33   0.000  31 33   0.001 122 33   0.000 -96 33
>1/03:15:47  1- 5  -18717.   19227.   0.000  -9 33   0.000  31 33   0.001 122 33   0.000 -96 33
 1/03:17:59  1- 5  -18831.   19057.   0.000 109 33   0.001  48 33   0.000 -56 33   0.000  36 33
 1/03:18:02  1- 5  -18834.   19053.   0.000 -20 33   0.000-110 33   0.000 -84 33   0.001-112 33
 1/03:18:05  1- 5  -18836.   19049.   0.000 159 33   0.000  86 33   0.000 157 33   0.000  26 33
 1/03:18:08  1- 5  -18839.   19045.   0.000 120 33   0.000 -69 33   0.000  88 33   0.000 -98 33

Probably the relevant part of the HIstory....

   410  FITLD RELEASE= '31DEC02 ' /--------------------------------------------
   411  FITLD OUTNAME='            '   OUTCLASS='      '
   412  FITLD OUTSEQ=    0   OUTDISK=  7
   413  FITLD SCLVIS =    1.08991 / Correlator scaling value
   414  FITLD DIGICOR =   1 / VLBA correlator digital corrs
   415  FITLD / FFT artifact corrections no longer necessary
   416  /--------------------------------------------------------------------
   417  /Begin "HISTORY" information found in FITS tape header by FITLD
   418  FITLD BLOCKED =                    T /
   419  FITLD FXCORVER= '4.22    '           /
   420  FITLD OPENED FITS FILE : 2002JUN26 19h58m43.95s
   421  FITLD SOFTWARE DIR : /home/fxcorr/code
   422  FITLD CORREL SOFTWARE VERSION : 4.22
   423  FITLD CORREL ON_LINE  : Motorola MVME167
   424  FITLD VXWORKS VERSION : 5.3.1
   425  FITLD LOG FILE : /home/fxcorr/logs/v47c020626:1638.log
   426  FITLD OBSCODE : GB042
   427  FITLD JOBNUM : 9238
   428  FITLD JOBSTART : 2002MAY25  1h55m41.05s
   429  FITLD JOBSTOP  : 2002MAY25  3h31m20.00s
   430  FITLD FILESTART : 2002MAY25  1h55m41.05s
   431  FITLD FILESTOP  : 2002MAY25  3h31m20.00s
   432  /End FITS tape header "HISTORY" information
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