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Log Book for April 27, 2004
Engineering Report
Rick Alena Reporting

Hab Systems:

Power: Frank and Don performed a temporary repair to the Generac cooling hose today pending receipt of the new replacement and the Hab is running at the full 14 KW provided by this unit. Electrical power is nominal and adequate for the Mobile Agents simulations. An adapter cable will allow quick cutover to the backup diesel generator.

Water: Closing the valve leading to the main outside reservoir did in fact reduce the unknown source of depletion of our main water supply. There was a significant decrease in the rate of depletion of the inside holding reservoir overnight. It is speculated that the check valve in the internal pump of the outside reservoir is leaking somewhat perhaps due to sediment. The outside water supply was replenished today with a supply run to town. We used about 70 gallons of water today, mostly for showers since it was a hot day.

GreenHab toilet supply water level returned to nominal overnight, probably due to less consumption. Production is probably normal.

Mobile Exploration Systems (MEX):

The Glenn Research Center (GRC) satellite truck generator developed an anomalous noise today and we will continue monitoring for further developments. Tightening a loose belt during a scheduled power down cycle may have reduced it, but there was minimal change in the other noise as a result. Mike Cauley wrote a memo on how to increase a TCP/IP connection across a satellite link to allow faster transfer of the large (50-100 MB) video files used for the Remote Science Team planning activity. Implementation of Large Windows for TCP/IP on both sides of the video transfer will improve rates significantly from 220 Kbps to many megabits/second.

The MEX wireless backbone and cluster performed well today during the EVA Robotic Assistant autonomous traverse to Pooh corner. Outages occurred during certain movements of the ATV cluster controller or the ERA, generally in close proximity to hills and other sources of multipath interference. We continue to improve our monitoring tools and are now able to measure RF signal levels and transfer rates during simulations using a PDA.

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