To: Edgar I. Castro

From: Jon Hagen

Date: 12-13-98

Subject: Monthly Report for November, 1998

The overspeed limiter was installed on the Gregorian dome. When it has run for several weeks as an overspeed detector with no false alarms, it will be connected into the emergency stop loop to enable its limiting function.

An occasional but crippling communications hang-up in the tie-down system was found to be caused by any one of the three slave microprocessors disabling the party-line bus while waiting indefinitely to complete a data transfer. Remote reset was not possible while the bus was hung. A timeout reset, added to the firmware in each slave, cuts short these hang-ups.

Several new schematics were prepared for the tie down system manual. Six others, lost in a hard disk crash, were redrawn.