[daip] PCCOR question

[Leonia Kogan]

Hi Dayton,

There is a confusion with a cable delay.

PC table as it is used for VLBA data has a cable delay which is the same 
for all IFs for the given time.
It is given in seconds, not in "tne pair of real and imaginary values 
per antenna per time interval"
It looks likes that your "cable" delay is put in the pulse cal tone 
column of the PC table having one tone only?
Is it true?
I think such a format is far from the PCCOR concept but still I'd like 
to see your PC table output.

Can you send it to me please?

Leonia
Dayton Jones wrote:

>Hi.  I am working with a small interferometer at JPL that sends an LO 
>signal to each antenna over a fiber optic cable.  Temperature changes 
>in the cables cause changes in the LO phases, so we measure and record 
>the round-trip phase variations for each cable.  My plan was to apply 
>these phase corrections, suitably scaled, to the baseline phases in 
>AIPS using tasks PCCOR and CLCAL.  The correlator output is currently  
>written to a FITS file to which the cable phase data are added.  In 
>AIPS the cable phases are contained in a PC table, with one pair of 
>real and imaginary values per antenna per time interval.  However, I 
>just found that PCCOR will not deal with data having a single IF, so 
>I am not able to get the cable phase corrections into SN or CL tables 
>to apply to the visibilities.  It is important that we correct the 
>baseline phases because we need to use them to solve for an improved 
>baseline vector.  Is there an alternative way to apply an external, 
>time-dependent phase correction to data in AIPS?  Thank you for any 
>suggestions you may have.  Cheers,
>                                    Dayton Jones  (dj at sgra.jpl.nasa.gov)
>
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