Classification: Unclassified I wonder if a network of inter-linked cubsats providing a TDRS-like service to other cubesats is viable? The limited life in orbit of typical cubesats may be a problem, but continually refreshing the network with new satellites may be more cost effective than requiring higher orbits. Alex Aplin "Personal e-mail. This e-mail is personal. It is not authorised or sent on behalf of Dstl. This e-mail is the personal responsibility of the sender." "The remarks in this e-mail are personal and do not represent Dstl or Government policy." "This e-mail and any attachment(s) is intended for the recipient only. Its unauthorised use, disclosure, storage or copying is not permitted. Communications with Dstl are monitored and/or recorded for system efficiency and other lawful purposes, including business intelligence, business metrics and training. Any views or opinions expressed in this e-mail do not necessarily reflect Dstl policy." "If you are not the intended recipient, please remove it from your system and notify the author of the email and centralenq@xxxxxxxxxxx"