[daip] APCAL problem

[Amy Mioduszewski]

I noticed that the data in the archive was supposedly fixed in January 2010.  So 
you could download the concatenated data and is should be O.K., but I would 
check it.

Amy

Amy Mioduszewski wrote:
> Ahhhh, I think I might know what the problem is.  In late 2009 FITLD had a bug 
> that made the Y coordinate negative when an antenna came in late.  Given KP is 
> antenna 10, I assume it came in late.  A negative Y coordinate would cause APCAL 
> to think that KP was pointing below the horizon and it would not find solution 
> for it.  Check this by looking in the AN table.  Since you probably got the 
> concatenated version of the data, for this version the data was read in and 
> written out of AIPS in late 2009, and the AN table was broken then.  The safest 
> way to fix this is to get the non-concatenated data (i.e. 
> VLBA_VSN005691_file37.uvfits etc) and load those in with FITLD.
> 
> Amy
> 
> Bill Peterson wrote:
>> Hi Amy,
>>
>> We're running 31DEC10 here. The experiment is BP157 - epoch C, which was 
>> run in September of 2009.
>>
>> Thanks!
>> Bill
>>
>> On Thu, Mar 3, 2011 at 3:05 PM, Amy Mioduszewski <amiodusz at nrao.edu 
>> <mailto:amiodusz at nrao.edu>> wrote:
>>
>>     Hi Bill,
>>
>>     How odd.  What version of AIPS are you using?  What is the
>>     experiment?  I will download it here and experiment.  Eric changed a
>>     couple things in APCAL in Feb, but they don't look like they going
>>     break it in this way.
>>
>>     Amy
>>
>>     Bill Peterson wrote:
>>
>>         I am running APCAL with no opacity correction on a VLBA dataset.
>>         For some reason, KP (Ant #10) does not get a solution out of
>>         APCAL, but all the other antennas are fine. There are entries in
>>         the TY and GC tables for ANT 10, and APCAL runs without
>>         complaint, but KP has no entries in the resulting SN table. I'm
>>         running APCAL with the defaults, and without an opacity solution
>>         there isn't much to tweak anyway - any idea what could cause this?
>>
>>         Thanks,
>>
>>         Bill Peterson
>>
>>
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> 
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