[daip] PC phase cal in AIPS

[Leonia Kogan]

Dear Robert,

You wrote:

>I believe I
>have followed the cookbook recommendations and have applied the attached PC
>table correctly using CLCOR followed by CLCAL.

If it is not misprint, you used a wrong task. It should be PCCOR, not CLCOR.

>When I last discussed this with AIPS staff in 1998 (Ketan I
>think), it was broken and being worked on.
>does phase calibration across IFs with the supplied PC
>tables work? 

Yes it has since the time when PCCOR was written (1996).
PCCOR was modified several times, but it has never been broken for 
a long interval. 

>If so, is there some subtlety involved that I need to be aware
>of?

Nothing special but following the help file of PCCOR.

IF you use CLCOR instead of PCCOR THEN 
   here is the answer
ELSE
   pay attension on the GAINVER -the input CL table;
   This table should not have any phase information;
   Best of all it should be REAL=1, IM=0.
   Print the short piece of the PC table and analyze it.

   IF you see something wrong there THEN
      here is the answer
   ELSE
      send me this short piece of the PC table;
      send me the IMH of your data;
      send me the input parameters uou use for PCCOR, CLCAL and POSSM
      END IF

   END IF

Leonid Kogan


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>From owner-daip at kochab.cv.nrao.edu Sat Jun 24 16:30 MDT 2000
Reply-To: <robert-mutel at uiowa.edu>
From: "Robert Mutel" <robert-mutel at uiowa.edu>
To: <daip at cv3.cv.nrao.edu>
Subject: [daip] PC phase cal in AIPS
Date: Sat, 24 Jun 2000 17:25:04 -0500
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Dear designated AIP:

I am once again stymied by the phase calibration using PC tables for VLBA
reduction. When I last discussed this with AIPS staff in 1998 (Ketan I
think), it was broken and being worked on. I have installed 31DEC99 AIPS and
am reducing VLBA data from April 2000 with attached PC table. I believe I
have followed the cookbook recommendations and have applied the attached PC
table correctly using CLCOR followed by CLCAL. However, the POSSM plots
clearly show that the phase cal didn't work.

My question is: does phase calibration across IFs with the supplied PC
tables work? If so, is there some subtlety involved that I need to be aware
of?

Thanks,

Robert Mutel


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