CAMAC Progress Report

                     Week Ending: January 18, 2002
                               Week: 51


Tom Folkers:
     1. No report.

Tom Sargent:
     1. The pointing model software needed to be re-done.  I studied 
        the 12m pointing model code for a couple days to figure out 
        how to implement the SMT pointing corrections with minimal 
        disturbance to the existing code. This was completed. The 
        results look reasonable but haven't been checked in detail.
     2. The refraction calculations were getting zeroed, basically 
        because in the lab we don't have any weather station reporting 
        so atmospheric variables (temp, pressure, etc.) are all 0.  I 
        studied the higher level 12m code and got the atmospheric 
        parameters initialized to reasonable non-zero default values. 
        The program now computes refraction that looks OK, though it 
        hasn't been checked.
     3. Tried to refine the slewing algorithm.  I think that for long 
        slews (> 10sec.) it may not be calculating the final target 
        position as accurately as it could.  In the time it takes to 
        do a long slew, the target can move a large distance.  I tried 
        having it recalculate the target position during the last 
        phase of the slew, but the results, in the simulation at 
        least,  were not clearly better than previously. There may be 
        another source of error on the order of 10 - 20 arcseonds. 
        This needs some further investigation. 

Pete Hubbard:
     1. Building a board to test AD8571 zero-drift amplifier. Samples 
        are coming next week for testing.

Dave Ashby:
     1. No Report.