[time-nuts] : L1 GPS timing signal(s) into local time on computer(s)

Chris Albertson albertson.chris at gmail.com
Tue Aug 21 02:01:41 EDT 2012


On Mon, Aug 20, 2012 at 3:10 PM, Sarah White <kuzetsa at gmail.com> wrote:

>
> I really like that the thunderbolt can (assuming the initial location
> has been uploaded, or the default "site survey" has been completed)
> still keep accurate time / discipline based on a single satellite lock
> (before falling back on the ovenized crystal in pure "holdover" mode)
>
>
All timing mode GPSes can keep time with one GPS sat in view.  It works
becaus ethe GPS "knows" it is not moving. and it has the exact location f
the one satellite.

Holding over when there are zero satellites is not standard and required a
good local oscillator.  You can built one froma cheap $20 timing GPS and a
OCXO and some logic chips.  The t-bolt is a GPS with a built-in GPSDO.

Chris Albertson
Redondo Beach, California



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