[daip] Problems with polarization calibration in AIPS 31DEC09

[Luis F. Rodriguez]

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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>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