CAMAC Progress Report

                       Week Ending: May 3, 2002
                               Week: 66


Tom Folkers:

Tom Sargent:
     1. Just before we left the SMT I recorded time and tracking data 
        in synchronization with Bill recording the same on the SMT 
        using the old system.  We were attempting to check the 
        accuracy of the new system's tracking and time computations.  
        I discovered that the I recorded the wrong LST - it was 
        updated only on a 10 sec. basis.  To attempt to get around 
        this, I added an ioctl to the IRIG driver to allow specifying 
        an offset to be added to the time. This was to in effect turn 
        the time back a few days and "re-observe" the measurements. 
        These showed that the UT vs LST relationship agrees with the 
        old system to within the printed accuracy (36ms).  However, 
        the position data did not reproduce the AZ and EL deviations 
        that we saw at the telescope. So some part of the position 
        computation is not fooled by simply setting the system time 
        back.
     2. Worked on finishing the sun-hiding logic.  It quickly became 
        clear that I needed some diagnostic commands that allow me to 
        position the telescope a minute or so (of time) in front of 
        the solar avoidance zone and then stop it. The sun will then 
        overrun the telescope. It is otherwise difficult to create a 
        situation that triggers the hide-from-sun software. 

Pete Hubbard:
     1. Tested a AM26LS32 rcvr chip that was driven by a DS8832 chip. 
        This driver is in the focus digital hardware chassis. Over a 
        short distance the differential signals are compatible with 
        each other.
     2. Found source of differential line I/O boards for use in 
        driving focus chassis.
     3. Comparing transmission line driver/receiver chips that meet 
        RS-422 and RS-485 requirements.

David Forbes: