Pointing problem

A problem has been detected that seems to result from the change of direction of the elevation motion of the antenna. The first indications were from transit tracking experiments in Dec 1999 and March 2000. The problem reveals itself most obviously as a 4" change in elevation pointing during tracking through transit, although examination of all-sky pointing datasets reveals it to be pervasive. Further details, our strategy to combat it in software, and subsequent attempts to estimate the efficacy of those measures are described at http://www.jach.hawaii.edu/JACpublic/JCMT/Facility_description/Pointing/problems.html