Hi I'd be a bit surprised if they were running anything as power hungry as an Rb all the time when a quartz based device would be smaller / lower power / lower volume. Of course they may have had mission requirements that drive them to a hydrogen maser ...
Bob On Sep 21, 2013, at 5:30 AM, Rob Kimberley <[email protected]> wrote: > David, > > The satellite has probably got a Rb as its clock (hopefully more than one). > All I can imagine is that there has been a major clock failure of some sort, > and everything is in free run and unable to sync up with ground. > > Thoughts? > > Rob > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of David J Taylor > Sent: 20 September 2013 17:51 > To: Time-nuts mailing list > Subject: [time-nuts] Space mission comes to an end becuase of a "computer > time tagging" problem > > NASA's Deep Space Comet Hunter Mission Comes to an end > > The news release includes this paragraph: > "After losing contact with the spacecraft last month, mission > controllers spent several weeks trying to uplink commands to reactivate its > onboard systems. Although the exact cause of the loss is not known, > analysis has uncovered a potential problem with computer time tagging that > could have led to loss of control for Deep Impact's orientation. That would > then affect the positioning of its radio antennas, making communication > difficult, as well as its solar arrays, which would in turn prevent the > spacecraft from getting power and allow cold temperatures to ruin onboard > equipment, essentially freezing its battery and propulsion systems." > > Knowing the membership of this group, does anyone have more insight into > what the "computer time tagging" problem might be? > > Thanks, > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: [email protected] > > _______________________________________________ > time-nuts mailing list -- [email protected] To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
