[daip] CLCOR 'OPAC' & VLBA correlator question

[Leonia Kogan]

Michael,

I do not know for sure whether the correlator makes a correction for 
opacity or not, but I know the people use another opcode = 'ATMO' to 
correct for the atmosphere opacity and they are happy with that.
'ATMO' carries out the correction considering that the zenith opacity is 
not constant at time (as 'OPAC') but is variable following the 
information given at INFILE.
So I infer that 'OPAC' can be used!!

Leonia


Michael Bietenholz wrote:
>    For a VLBI data set, the VLBA correlator has an atmosphere model
> which it used for delays etc., but does it apply any sort of opacity
> correction?  In particular, is running CLCOR, OPCO = 'OPAC' a good
> thing to do for VLBA stuff, or would it apply the opacity correction
> twice, and therefore be bad?  (I'm aware of the fact that this opacity
> correction only very approximate, but its better than nothing).
> 
>                 thanks,        michael b
> 
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