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

Sarah White kuzetsa at gmail.com
Tue Aug 21 12:35:39 EDT 2012


Thanks Chris.

I always appreciate clear explanations. I'm assuming that the "fixed
location" requirement is important to note for purposes of compensating
for any dopler shift, as well as the distance the signal must first
travel before being decoded.

... I would presume that the fixed location used for above calculations
would be relative to the position of the antenna? I read somewhere that
even compensating for the length of the antenna cabling is important?

This is all so exciting. Thanks everyone.


On 8/21/2012 2:01 AM, Chris Albertson wrote:
> 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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