[evlatests] Very strange baseline error

Michael Rupen mrupen at nrao.edu
Fri Jun 14 09:30:29 EDT 2013


>
> I am assuming that by "baselines" you mean the u,v,w?  If so, then I was
> under the strong impression that those are not in the SDM but calculated
> in the fillers (e.g. BDF2AIPS, asdm2MS) from antenna positions, time, and
> position. Thus I guess the question is then how the filler got confused...

Steve is correct -- there are no uvw in the SDM.  It would be interesting
to load at least the first scan in this data set into CASA (I presume
Rick used BDF2AIPS) to see whether this is a BDF2AIPS-only problem.

           Michael

> On Thu, 13 Jun 2013, Rick Perley wrote:
>
>>    The 30-hour flux densities run demonstrated a possibly unique
>> problem with baselines:  The first source observed (J0217+7349) had
>> baselines scaled over 1000 times too large!  The source was observed
>> multiple times during the 30 hours -- for each scan, the same baseline
>> scaling error occurred.  No other source suffered this problem.  (And
>> UVFIX repaired the problem).  I dismissed this as a 'one-of' issue.
>>
>>    But it isn't.  The follow-up 'Flux Redux' run suffers exactly the
>> same problem, with the same source.  It was also the first object in the
>> file.
>>
>>    Any ideas here?
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>
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