[daip] Problems with polarization calibration in AIPS 31DEC09

[Eric Greisen]

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