[daip] VLA coordinates, antenna positions

[Eric Greisen]

Apparently all bands have shifted antenna positions when Q band and
Pie Town are somehow involved in a run.  You did not tell me this!  So
FILLM has been wrong for some time....

Claire is reporting a serious problem as well - see below

Eric Greisen

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From: Claire Chandler <cchandle at aoc.nrao.edu>
To: Eric Greisen <egreisen at aoc.nrao.edu>
cc: Amy Mioduszewski <amiodusz at aoc.nrao.edu>
Subject: apparent positions for archive data
Date: Sat, 20 Nov 2004 23:30:01 -0700 (MST)

chaps,

I've found that the apparent positions seem to be off for all the archive
data I've checked, including some taken as recently as 2002.  however,
these were all observed in B1950 coordinates.  I did run realtime fillm to
look at data obtained more recently, and they were fine, but were probably
observed in J2000.  Amy said her test was fine, but again, were they
J2000?  could there be a general problem with apparent positions for B1950
data?

Claire
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