[evlatests] WIDAR baselines, and time offsets

[Barry Clark]

Ken Sowinski wrote:
> On Tue, 7 Jul 2009, Rick Perley wrote:
> 
>>    All coordinates have the same signs between the two arrays.   So,
>> unless I am seriously misunderstanding something, it appears that we are
>> inverting the signs of the visibilities (i.e., taking the complex
>> conjugate).
> 
> conjugation does not, in general,  change the phase by 180 degrees
> 
>>    While making the comparisons noted above, I noticed that the two
>> databases are not precisely identical in their time axes.  Michael R.
>> noted some time delay between the arrays while the data were taken.  I
>> can confirm this, based on the index files of the two (supposedly)
>> parallel sets:  The VLA dataset is 32 seconds behind the WIDAR dataset.
>> In other words, all scans in the VLA dataset start and stop 32 seconds
>> later than those in the WIDAR dataset.
> 
> I would expect 33 seconds.  Data from the VLA correlator is
> labelled in IAT, while data from Widar seems to be labelled
> in UTC.  I hope that the sign of IAT-UTC is consistent with
> what you describe.
> 
Does uvfix know about this?
> 
> _______________________________________________
> evlatests mailing list
> evlatests at listmgr.cv.nrao.edu
> http://listmgr.cv.nrao.edu/mailman/listinfo/evlatests