[daip] gain missing in APCAL

[Amy Mioduszewski]

Hi Arnaud,

I figured out the problem, but it is one of those complicated things that there 
could be bugs in various tasks connected to it, so it might take a bit to have a 
final fix.  There are a few easy work arounds though.  The issue is the spurious 
2nd freqid that exists in the data.  If you do a PRTAB (INEXT='FQ') or a LISTR 
it will show you this FREQID.  Anyway, there seems to be a few minutes of 
autocorrelation on antenna 4 with FQ#2.  So when ANTAB loads the TY table it 
assigns some Tsys entries to FQ#2, and when APCAL encounters these entries, it 
looks for a GC entry for FQ#2 and doesn't find one.  I think I might add the 
FREQID to that error message since that would have helped diagnosing the 
problem.  This also explains why I didn't get this error when I UVCOPied the 
data because I only copied FQ#1.  The easiest work around is to explicitly set 
FREQID=1 in APCAL.  I tested this and it worked.

The question is how this situation could be handled better in AIPS.  I suspect 
the autocorrelations are "real" so how could AIPS have done things differently?

Cheers,

Amy

On 09/16/2014 01:44 AM, Arnaud Collioud wrote:
> Hi Amy,
>
>>> I have no argument against running ANTAB first...as long as, USUBA does a great job to assign subarrays and update tables.
>>>
>> It did appear to assign the different Tsys to different subarrays, although I didnt' look close enough to see if it did it right.
>
> OK. I will have a look at it.
>
>>> I could not test either because when I try running ANTAB (after FITLD, VLBAMCAL and INDXR, but before USUBA), I have the following message:
>>>    ANTAB1: Task ANTAB  (release of 31DEC14) begins
>>>    ANTAB1: NXREAD: INCREASE PARAMETER MAXNX
>>>    ANTAB1: Purports to die of UNNATURAL causes
>>> I suppose I have to change MAXNX in ANTAB.FOR. Is it safe to do it (and which value should I put)? How could I then recompile ANTAB? (I used the binary installation...)
>>>
>>
>> Eric fixed this problem.  If you do a midnight job you should get this fix.
>
> Got the MNJ this morning. Thanks!
>
> Cheers,
> Arnaud
>
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