[daip] USUBA and GC tables.

[Craig Walker]

I have a test data set with multiple subarrays.  FITLD would not add NX 
or CL tables, suggesting I run USUBA and INDXR.  The issue in USUBA 
reported recently has been fixed, so now I can follow those 
instructions.  Now APCAL will not run because the GC table entries have 
include subarrays and there is only one row per station.

I tried using TABED to set the subarray column in the GC table to zero. 
  That did not help.  The successful work-around was to create a new GC 
table for each subarray, use TABED to edit in the corresponding subarray 
number in the subarray column, and then run APCAL with specified GCVER 
and SUBARRAY.  I tested that, and it worked.  Then you would need to run 
CLCAL with SNVER and INVER set, which I assume will work, but have not 
yet tried.  So it is possible to do the APCAL - just a bit awkward.

The best fix would likely be to teach USUBA about subarray 0 and teach 
APCAL to accept subarray zero on input.  That might be a bit of a pain. 
  But it would at least be helpful to add a bit to the APCAL error 
message to let the user know that the issue might be the subarray. 
Right now, it just says there is no gain.

Cheers,

Craig


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     R. Craig Walker            Array Operations Center
     cwalker at nrao.edu           National Radio Astronomy Observatory
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