CAMAC Progress Report

                       Week Ending: May 10, 2002
                               Week: 67


Tom Folkers:

Tom Sargent:
     1. Finished the test code that allows positioning the telescope 
        just in front of the solar avoidance zone.  Positions so close 
        to the solar avoidance zone are an interesting test of the sun 
        avoidance logic and revealed a couple of bugs in it, which I 
        have fixed.  The sun hiding code seems to work now, but still 
        needs more testing.  It has 2 stages: first it tries to move 
        the telescope to whatever clear area can be reached the 
        quickest. After it is clear, then it moves to an azimuth that 
        is substantially numerically lower than that of the sun, or 
        far enough in the northwest so that the sun can't ever reach 
        it.  I still have to address the case where only one axis 
        drive is working.
     2. Bill has added position and time logging features to the 
        fahren program so that I can use my simulator in the lab at 
        the same time to compare the tracking of the 2 systems.  I 
        verified I can access and download the logs that it creates.  
        We will check this further next week.
     3. I have had a minor problem with accounting for the movement of 
        the solar avoidance zone during a long slew. This was 
        especially troublesome when moving the telescope to a fixed 
        position since the relative motion between the two could 
        exceed a degree.  The solution was to expand the solar 
        avoidance zone by an amount equal to the solar motion over the 
        time interval that the slew requires. This is computational 
        very simple and seems to work well in practice. 

Pete Hubbard:
     1. Differential line driver and receiver PC board design.
     2. Ordered TI sn 65LBC172 and sn65LBC172 chips.

David Forbes: