[daip] VBGLU

[Amy Mioduszewski]

I don't know how long it will take.  I've tried all the simple stuff, is it the 
compiler, the optimization etc..

Amy

Yuri Y. Kovalev wrote:
> 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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>