[daip] Invalid Tsys values not recognized.

[Walter Brisken]

Likely a DiFX problem.

999 is what the old "cal" files used to indicate a bad tsys record. 
Unfortunately that goes through a different loading process than the cal 
xfer version.  I just found one pathway for an invalid Tsys value to be 
reported as 999 instead of NaN, which is what the FITS-IDI doc wants.

I've put a fix into difx2fits.  After the next DiFX release (maybe a 
couple months) it will be in operation.

 	-Walter

On Sat, 30 Aug 2014, R. Craig Walker wrote:

> I have a TY table from TA035B (Aug 14 data using the DDC) that has some
> entries that appear to be flagged as bad.  The values, according to PRTAB
> and LISTR, are 999.00.  They are not getting recognized as bad.  These are
> the first Tsys of the project in RR for antennas 5 and 6.  They appear to
> get used in calibration, probably with that value as there are clear
> spurious amplitudes at the time in question.  Something needs to be done
> to either avoid such values, or have them recognized properly.
>
> Data set is on noatak disk 3 (/home/noatak2/AIPS/DA01)
> AIPS 2:  288  450 TA035B_VLBA .TASAV .    1 UV 30-AUG-2014 21:12:21
> (the original MULTI file has been subjected to editing of the TY table).
>
> This problem rings a bell so I think we've seen it before.  Apparently it
> has not been addressed.
>
> Cheers,
>
> Craig
>
>
>
> ---------------------------------------------------------------------
>    R. Craig Walker            Array Operations Center
>    cwalker at nrao.edu           National Radio Astronomy Observatory
>    Phone  575 835 7247        P. O. Box O
>    Fax    575 835 7027        Socorro NM 87801   USA
> --------------------------------------------------------------web
>
>