[daip] VBGLU

[Yuri Y. Kovalev]

Dear Amy,

I was indeed happy to realize that I was not the only one to get this 
problem. Thanks for working on that!

Do you have any estimation on how long will it take to fix the problem?

As you are probably aware of, we reduce and make public MOJAVE data 
within several weeks after correlation. Right now the situation is 
especially hot because of the Fermi support by VLBA (MOJAVE).

Cheers,
Yuri.

On Fri, 12 Dec 2008, Amy Mioduszewski wrote:

> 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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