[daip] Problems with polarization calibration in AIPS 31DEC09

[Luis F. Rodriguez]

Dear Eric: Thanks a lot. Best Regards, Luis.


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>Date: Mon, 12 Oct 2009 15:41:22 -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:
>> 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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>>> 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