CAMAC Progress Report

                    Week Ending: September 06, 2002
                               Week: 84


Tom Folkers:

Tom Sargent:
     1. I added a revision  number to the DSP code. This is 
        transmitted in the init-report that is sent from the DSP to 
        the Linux machine when the Linux machine first starts up. 
     2. I finished coding the archive() function in servo.c. This will 
        be used by the OTF observing modes. It hasn't been tested yet. 
        It is ready to go, though.
     3. Couldn't get the old DSP simulator program to work at the SMT 
        either. So, I re-coded the simulation logic into the non-
        simulator DSP code. It is enabled by re-compiling with a 
        certain macro undefined.  Seems to work now.  This is better 
        than having 2 different DSP programs.
     4. I fixed a couple of bugs introduced via mods from last week. 
     5. Made the hide-from-sun logic a little smarter. This code needs 
        more testing. 
     6. Made mods to allow driving the telescope in elevation below 
        the 2 deg. pre-limit where it normally stops.  We wanted to be 
        able to put it at 0 deg. elev.  This required a command to 
        change the limit and a command to change the max velocity.  In 
        the limit, the Krupp rack limits vel. to 10% of max.  The 
        servo logic has to use the same limit or it won't be able to 
        drive the telescope. At Bill's request, I also ran the 
        elevation axis into the hard limit (very slowly!) to see 
        exactly where the limit is. The encoders read -1:21:12.2 when 
        it was at the hard limit. 
     7. I finally fixed the position "re-strobing" problem.  Often 
        when a planetary object is selected, the system would start to 
        go to it and then a small fraction of a second later, tracker, 
        tells it to go there again (and usually again a 3rd time).  
        This makes it come to a stop and then restart the slew.  It 
        wastes about 10 sec.  I don't know why tracker (or tscom) is 
        re-strobing the new object, but I was able to finally fix it 
        by having the program watch the name of the object being 
        selected.  If it it told to go to the same object, it ignores 
        the command. ??Logic resets after the slew finishes. 

Pete Hubbard:
     1. Found the proper connectors for the secondary control chassis.
     2. Ordered connectors and cable for secondary control chassis.
     3. At SMT for testing and to verifying connector type used on the 
        secondary control chassis.
     4. Helped with the 230 Ghz receiver bias problem. When trying to 
        make an I/V curve the x axis has 4.5V P-P triangle wave at 
        24Khz.
     5. Hunting for the problem with the control room Sam Bus channels 
        28 and 29. Oscillation on those channels only.

David Forbes: