[daip] New Ticket - [!OMX-126690]: Polarization calibration

[Robert T. Drzazga]

New Ticket: Polarization calibration

I have a question related to the BLCAL task (in AIPS) in calibration of

POLARIMETRIC observations in which VLA-EVLA baselines are present.



I have already reduced my VLA D data at 1.4 GHz in the standard way with

the BLCAL task to calibrate VLA-EVLA baselines as it was recommended before in

Guideline. However, recently I have found in this 
Guideline the following 
WARNING : If you are doing polarization
 calibration and imaging, do not 
run this step as it will cause a mis-match
 in the parallel-hands and cross-hands 
that can break PCAL and polarization
 imaging.


In refer to this warning, do you recommend to recalibrate all the data but

without BLCAL? I haven't seen any problems with the PCAL after 

the BLCAL and the orientations of polarization vectors from different 

data sets (days of observations) are compatible for my target galaxy.

Is there a way to check somehow if recalibration is indeed necessary?

Ticket Details
===================
Ticket ID: OMX-126690
Department: AIPS Data Processing
Priority: Default
Status: Open
Link:  https://help.nrao.edu/staff/index.php?_m=tickets&_a=viewticket&ticketid=310