[daip] VBGLU

[Amy Mioduszewski]

Dear Yuri,

I have downloaded your data and confirmed your problem.  Every 10th or so point 
has a very high amplitude and zero phase for those IFs after VBGLU.  I will 
continue to work on it.

Amy

Yuri Y. Kovalev wrote:
> Dear colleagues,
> 
> I had an issue with VBGLU and would like to present this case to you.
> Experiment: BL149BE (15 GHz, dual-pol, 512 Mbps).
> Two AIPS friendly files from two correlator passes were downloaded from 
> the NRAO archive and uploaded to AIPS (31DEC08 version from our MPIfR 
> server, date: 12/12/2008) using FITLD. Then they were merged together 
> using VBGLU.
> Parameters used can be found below:
> *****
> task 'fitld'; default
> INTAPE = -1; NCOUNT = 1; OUTNAME = 'BL149BE'
> outdisk = 1 ; DOUVCOMP = FALSE ;CLINT = 0.5;
> DIGICOR=1; WTTHRESH=0.7
> outcl 'uvdp1';datain 'U:BL149BE.FITS1
> runwait('fitld')
> outcl 'uvdp2';datain 'U:BL149BE.FITS2
> runwait('fitld')
> task 'vbglu'; default
> getn 1; get2n 2
> outna=inna;outdi=indi;outclass='uvdata'
> runwait('vbglu')
> *****
> 
> It turned out that original uv data were affected by vbglu.
> For the first about 12 hours of the experiment, amplitudes and 
> phases for RR & LL, baseline OV-FD, were artificially changed.
> Only this baseline was affected.
> For the second half, aplitudes and phases are OK.
> Compare attached POSSM plots:
> POSSM_NOGLU1.PS -- from correlator pass1 after FITLD,
> POSSM_NOGLU2.PS -- from correlator pass2 after FITLD,
> POSSM_VBGLU.PS  -- after VBGLU.
> 
> Would appreciate your comments.
> 
> Thanks,
> Yuri.
> 
> 
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