Here is a link provided by the professor of mechanical and aerospace engineering at Cornell University, Professor Mason Peck. http://spectrum.ieee.org/aerospace/satellites/exploring-space-with-chips ized-satellites very cool article. Darwin (Dar) Piatt - W9HZC Midwest HomeBrewer's and QRP Group http://www.hbqrp.org <http://www.hbqrp.org/>