[daip] VLBARUN failure at PCCOR task

[Eric Greisen]

On 5/6/2020 4:18 PM, Venkatessh Ramakrishnan via Daip wrote:
>
> Hello,
>
> I encountered an error while running the PCCOR task as part of the 
> VLBARUN pipeline. The error reads as follows:
>
> All rows of the PC table are bad for the selected parameters.
> Purport to die of UNNATURAL causes.
>
> I am performing the reduction of my VLBA experiment BR229A using the 
> AIPS19 version on my Linux machine. I tried plotting the PC table and 
> found dips during the observation of the bandpass calibrator. If I 
> understand correctly, these dips are caused when the location of the 
> bandpass calibrator is farther away from the target, as a result, 
> twisting the cables. But could that or anything else affect correcting 
> the instrumental phases?


This tells you that the PC table does not have valid entries in the 
strong source time range.  Set INVER=-1 to do "manual phase cal" 
instead.  That should work and is often much better than PCCOR.

Eric Greisen



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