[time-nuts] GPSDO recommendation
Peter Gottlieb
nerd at verizon.net
Wed Oct 12 11:33:29 UTC 2011
I would like to get better than 100 uSec so I can get a couple of degrees
resolution on a synchrophasor project.
Peter
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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