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

Chris Albertson albertson.chris at gmail.com
Tue Aug 21 06:01:41 UTC 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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