CAMAC Progress Report

                    Week Ending: December 14, 2001
                               Week: 46


Tom Folkers:
     1. No Report.

Tom Sargent:
     1. Added a one word long "resync" command to the DSP's command 
        list. Receiving this code causes it to re-initialize its 
        command parsing. There have been some failures which may be 
        due to multi-word commands getting garbled somehow, so this 
        may make it recover from those situations.  The servo code now 
        sends resync commands periodically and after all error 
        conditions are reported.
     2. Fixed the "getting started" problem:  The DSP always starts up 
        with its cycle counters set to 0.  After the telescope moves a 
        short distance (to allow it to do an ellipse fit) and servo 
        sends it a coarse encoder reading, then the position appears 
        to jump from nearly 0 to something approximating the right 
        position.  This is sensed as a high speed lurch which usually 
        disturbs the first object acquire that is done with the 
        telescope.  Servo has been changed to detect this initial 
        state and to move the telescope slowly for a second until the 
        position logic has become fully initialized.  Only then is the 
        servo loop logic allowed to operate.
     3. Fixed the reset encoder problem which caused the telescope to 
        move both axes to their pre-index positions even if only one 
        axis' encoder was being reset.
     4. Updated the documentation to reflect changes and additions 
        made in the last 3 months.

Pete Hubbard:
     1. Made changes to the Digital Back End circuit board and wiring 
        changes to the other boards in the chassis box.
     2. Using HP3561 Dynamic Signal Analyzer to test some low pass 
        filters that will be used with the A/D chassis to limit 
        bandwidth from the antenna encoders.
     3. Building a second test set for operating the MPI 6000 
        amplifier boards so that one can test filter's while also 
        using the telescope simulator in the lab.

Dave Ashby:
     1. No Report.