[time-nuts] GPSDO recommendation

Peter Gottlieb nerd at verizon.net
Wed Oct 12 07:33:29 EDT 2011

I would like to get better than 100 uSec so I can get a couple of degrees 
resolution on a synchrophasor project.


On 10/12/2011 12:48 AM, Chris Albertson wrote:
> On Tue, Oct 11, 2011 at 6:17 PM, Peter Gottlieb <nerd at verizon.net 
> <mailto:nerd at verizon.net>> wrote:
>     I have been using Rb oscillators as my standard for a while but would like
>     to be able to have both a frequency as well as time standard which is
>     synchronized to something outside my lab.  I would like to have:
>     Frequency stability at least as good as the Rb osc
>     Time server which can be accessed on my network
>     12 or 24 volt DC operation for easy power backup
>     Cost ideally $200 or less
>     I am willing to do some building and gathering to implement this,
>     including setting up a computer.  The time server need only last as long
>     as the computer is up in a power outage, although I would keep the base
>     receiver/osc running for an extended period.
>     Any recommendations?
> What level of accuracy do you need on the server.  If "a few milliseconds" is 
> good enough then you can use internet pool servers as you reference and you 
> don't need GPS.  If you need a microsecond or better then you are pushing the 
> state of the art  GPS can work between those limits.         The hardest part 
> will be finding a computer that can run Linux or BSD UNIX and an run on 12 or 
> 24 volts DC. I'd guess and older used notebook computer would be best.   "Old" 
> is best too because you will need a "real" serial port, not a USB converter. 
>  Use real serial port for best accuracy when connecting to GPS.    The 
> software NTP, will come with linux or BSD.
> Chris Albertson
> Redondo Beach, California
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