[daip] PC phase cal in AIPS

[Leonia Kogan]

There are some misprints again at his message:

>I had previously run ACCOR on the CL table to correct for the parallactic 
>angle 

ACCOR does not correct the parallactic angle, ACCOR has nothing to do with 
a CL table.

>When I reversed the order and ran AACOR after PCCOR/CLCAL, it worked.

There is no AACOR in AIPS.

I do not send this message to professor Robert Mutel to stop analizing his 
misprints. I am glad that PCCOR works. 

Any other ideas?

Leonia

----- Begin Included Message -----

>From robert-mutel at uiowa.edu Mon Jun 26 10:19 MDT 2000
Reply-To: <robert-mutel at uiowa.edu>
From: "Robert Mutel" <robert-mutel at uiowa.edu>
To: "Leonia Kogan" <lkogan at zia.aoc.NRAO.EDU>
Cc: "Jim Ulvestad" <julvesta at zia.aoc.NRAO.EDU>
Subject: RE: [daip] PC phase cal in AIPS
Date: Mon, 26 Jun 2000 11:19:46 -0500
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Dear Leonia,

Thanks for the quick response! Indeed I was running PCCOR, and the problem
was that I had previously run ACCOR on the CL table to
correct for the parallactic angle (this is a full polarization observation).
When I reversed the order and ran AACOR after PCCOR/CLCAL, it worked.

There's no indication of this in the cookbook; perhaps it should be noted.

Thanks,

Robert Mutel
Professor of Astronomy
University of Iowa
Iowa City IA 52242
319-335-1950  FAX 319-335-1753
robert-mutel at uiowa.edu <mailto:robert-mutel at uiowa.edu>
http://denali.physics.uiowa.edu/rlm



> -----Original Message-----
> From: [Leonia Kogan] [mailto:lkogan at aoc.nrao.edu]
> Sent: Saturday, June 24, 2000 8:08 PM
> To: robert-mutel at uiowa.edu
> Cc: daip at cv3.cv.nrao.edu
> Subject: [daip] PC phase cal in AIPS
>
>
> 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
>
>
> ----- Begin Included Message -----
>
> >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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> Status: RO
>
> 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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>
>



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