[time-nuts] Water on Enceladus - What does this imply about NASA'a ability to measure frequency?

Tom Knox actast at hotmail.com
Fri Apr 4 07:53:56 UTC 2014


 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: caf at omen.com
> To: time-nuts at 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   caf at 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
> 
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