[daip] Problems with polarization calibration in AIPS 31DEC09

[Eric Greisen]

Luis F. Rodriguez wrote:
> Hi Eric: I redid everything and now when I run RLDIF, I get
> a different message:
> 
> AURIGA> RLDIF1: Task RLDIF  (release of 31DEC09) begins
> AURIGA> RLDIF1: Doing no flagging this time
> AURIGA> RLDIF1: ERROR IN SELF-CONSISTENT AVERAGING
> AURIGA> RLDIF1: No phase difference returned
> AURIGA> RLDIF1: ERROR IN SELF-CONSISTENT AVERAGING
> AURIGA> RLDIF1: No phase difference returned
> AURIGA> RLDIF1: returns adverbs to AIPS
> AURIGA> RLDIF1: Appears to have ended successfully
> 
> and matrices full of zeroes.
> 
> I guess that the best will be if you try POLCAL on a database.
> 
> Regards, Luis.
> 
> 
> 
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>> Date: Mon, 12 Oct 2009 11:28:46 -0600
>> From: Eric Greisen <egreisen at nrao.edu>
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>> To: "Luis F. Rodriguez" <l.rodriguez at crya.unam.mx>
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>> Subject: Re: [daip] Problems with polarization calibration in AIPS 31DEC09
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>> Luis F. Rodriguez wrote:
>>>> Is the SUBARRAY adverb set to something besides 1?   The AN file you 
>>>> printed looks good but is for SUBARRRAY  1.  If you are asking RLDIF for 
>>>> a 2nd SUBARRAY there could be trouble.  Otherwise I have no real idea.
>>>>
>>> I have been using SUBARRAY 0. I checked that in RLDIF I was asking
>>> for SUBARRAY 0. After PCAL I do get a matrix from RLDIF
>>> with DOPOL 1, but it is only zeros.
>>>
>>> I can repeat the calibration sticking to SUBARRAY 1.
>>>
>>>
>>>> Is your 31DEC09 completely up to date via the MNJ.  I see from the 
>>>> XYZHAND keyword that it is relatively recent but I did not remember to 
>>>> link everything at first.
>>>>
>>> The computer people here assured me that the MNJ is active.
>>> Is there an easy way to check when was the last update?
>>>
>>> Luis.
>> I immediately found one thing - the format translator that moves an AN 
>> file from the old format to the new loses the keyword POLTYPE since that 
>> is an "added" keyword not created when the file is new.
>>
>> If PCAL was run before the change in AN format and RLDIF after then 
>> there will be a problem.  If PCAL is also run after the change (as in 
>> the AN file you sent me), then you should not get the
>>
>> RLDIF1: UNKNOWN POLARIZATION PARAMETERIZATION ='
>> RLDIF1: NO USABLE POLCAL INFORMATION AVAILABLE IN AN TABLE
>>
>> messages.  If RLDIF prints something then it has gotten through the 
>> polarization calibration set up and the symptoms have now changed.
>>
>> Eric

I have found it - I forgot to compile some subroutines (again).  The 
recompiled/linked versions of things should appear with the MNJ tomorrow.

Sigh....

ERic Greisen