[daip] VLBAEOPS problem

[Amy Mioduszewski]

Well your amplitudes in CL table 3 are 1.  If you set the PIXRA in SNPLT you 
will see that.  Why the tic algorithm fails is another question.  So if you are 
having amplitude problems, it is not because of VLBAEOPS.

Amy

Bill Peterson wrote:
> Hi Amy,
> 
> Here's the TASAV file.  What made me think the amplitudes are bad is 
> that when I try to plot CL table 3 (the one produced by EOPS), the tic 
> mark algorithm fails, making me thing the amplitudes are way out of 
> scale.  Bob is saying that he's getting fluxes in gigaJanskys as a 
> result.  I'm not getting anything that bad, but the amplitudes are 
> definitely screwed up.  I used SETJY to set my flux calibrator - 
> 'J0238+166' - to 893 mJy, but when I do something like UVPLT and set it 
> to plot flux vs. time, I only get about 30 mJy.
> 
> I looked at CL 3 with PRTAB - I'm not sure what I'm looking at with raw 
> CL tables, but the weights are all 1 and the REAL and IMAGINARY columns 
> are around .9 and .5, respectively, which doesn't seem like it would 
> screw things up too badly.
> 
> VLBAEOPS doesn't have a lot of inputs, just
> AIPS 1: VLBAEOPS: Procedure to fix EOPs used by the VLBA correlator
> AIPS 1: Adverbs     Values                 Comments
> AIPS 1: ----------------------------------------------------------------
> AIPS 1: INNAME     'BM267A_VLBA'           Input file name
> AIPS 1: INCLASS    'UVDATA'                Input file class
> AIPS 1: INSEQ         2                    Input file sequence number
> AIPS 1: INDISK        1                    Disk number for input file
> AIPS 1: INFILE     *all ' '                    '' -> automatically
> AIPS 1:                                              download file
> AIPS 1:                                    not '' -> use stated file
> AIPS 1:           VLBAEOPS is defined in the VLBAUTIL run file.
> 
> If you can see anything that looks wrong, let me know.
> 
> Thanks,
> Bill
> 
> 
> 
> On Wed, Jul 9, 2008 at 1:03 PM, Amy Mioduszewski <amiodusz at nrao.edu 
> <mailto:amiodusz at nrao.edu>> wrote:
> 
>     Hmmmm, how do you know the amplitudes are bad, did you do a PRTAB?
>      Could you TASAV your data and send me that file along with your
>     VLBAEOPS inputs.
> 
>     Amy
> 
>     Bill Peterson wrote:
> 
>         Hello,
> 
>         We're working with a VLBA+Bonn+GBT+VLA dataset, and have found
>         that while VLBAEOPS appears to modify the phases and delays in
>         the proper fashion, it completely messes up the amplitudes in
>         the resulting CL table, so that SNPLT cannot even display them.
>          When we came across this problem, we ran VLBAEOPS on a dataset
>         from an earlier epoch that did not have this problem and
>         reproduced the same error.  Has there been a recent change to
>         VLBAEOPS or CLCOR that could cause this?
> 
>         Let me know if you need more information.
> 
>         Thanks,
> 
>         Bill Peterson
>         University of Iowa
> 
> 
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