[daip] APCAL problem

[Amy Mioduszewski]

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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