[daip] FRING fails after calibration with ACSCL

[Walter Brisken]

Hi DAIP,

I'm working on VLBA dataset BB397A on parallax, user=397 indisk=1 catnum=1 
.  FRING reports SNR=0 after application of calibration from task ACSCL 
even though the delays are reported correctly in the verbose messaging. 
Prior to application of ACSCL calibration (which generated SN3 and merged 
into CL5), FRING SNRs were very high (100s).

My suspicion is that recent changes to FITLD to change the visibility 
weights are triggering the problem.  This claim is supported by a test I 
ran where I used version='NEW' for FITLD, then switched back to 
version='TST' for the remainder of the calibration.  In this case, SNR 
values are back to expected levels.  This was done as user=397

The details of the data reduction are found in AIPS script: 
/home/parallax/VLBA/BB388/scripts/BB397A.cal

If you want to run the data reduction script, note that BB388LINKS points 
to /home/parallax/VLBA/BB388/links

 	-Walter

-- 
-------------------------
Walter Brisken
Director
Long Baseline Observatory
(575)-835-7133 (office)
(505)-234-5912 (cell)