The DIS 60 Hz noise problem is fixed. The fiber data interface has been installed and debugged. Jim Gunn was correct: the 60 Hz noise was due to a ground loop through the braid in the original coax data interface. Technical note: In the process of debugging the interface, I had to disconnect the coax receiver and inverter for the "L" line into the DIS micro. If we ever have to revert to the coax interface, that line will have to be reconnected. Jon --- Dr. Jon Brinkmann Apache Point Observatory Instrument Scientist 2001 Apache Point Road Internet: brinkmann@nmsu.edu P.O. Box 59 URL: http://www.apo.nmsu.edu/brinkmann/ Sunspot, NM 88349-0059 APO APO APO APO APO Apache Point Observatory 3.5m APO APO APO APO APO This is message 137 in the apo35-general archive. You can find APO the archive on http://www.astro.princeton.edu/APO/apo35-general/INDEX.html APO To join/leave the list, send mail to apo35-request@astro.princeton.edu APO To post a message, mail it to apo35-general@astro.princeton.edu APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO APO