90 microns is approx a freq res of about 1 x 3.66 -12 Thomas Knox
> Date: Thu, 3 Apr 2014 23:17:57 -0700 > From: c...@omen.com > To: time-nuts@febo.com > Subject: Re: [time-nuts] Water on Enceladus - What does this imply about > NASA'a ability to measure frequency? > > One needs to know the carrier frequency. Must be a high quality reference > for the Cassini transmitter. > > On 04/03/2014 08:17 PM, Chris Albertson wrote: > > I just read about a discovery of a liquid water ocean on Saturn's moon > > Enceladus. The method used was to measure the velocity of a > > spacecraft as it makes a close fly-by. Gravitational anomalies will > > cause the spacecraft to speed up or slow down as it flies over massive > > objects like mountains. With three pass they now have a 3 dimensional > > map of density distribution. It must be very sensitive if they can > > tell liquid water from ice by its gravitational field. (or even rock > > from ice) > > > > They say they can measure the spacecraft's velocity to 90 microns per > > second. They do this by measuring the Doppler sift of the > > transmitter. I've been trying to figure out what 90 microns/sec > > means in terms of frequency. But I think(?) I need to know the > > orbital velocity of Enceladus. > > -- > Chuck Forsberg WA7KGX c...@omen.com www.omen.com > Developer of Industrial ZMODEM(Tm) for Embedded Applications > Omen Technology Inc "The High Reliability Software" > 10255 NW Old Cornelius Pass Portland OR 97231 503-614-0430 > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.