[time-nuts] GPSDO recommendation
paulswedb at gmail.com
Wed Oct 12 19:36:08 UTC 2011
Now this is some very wise advice indeed.
Its the ole power cost.
Great reply and solution.
I like things that draw zip power and can live on a basement wall for 10
years just doing there job.
On Wed, Oct 12, 2011 at 2:14 PM, Chris Albertson
<albertson.chris at gmail.com>wrote:
> On Wed, Oct 12, 2011 at 4:33 AM, Peter Gottlieb <nerd at verizon.net> wrote:
> > I would like to get better than 100 uSec so I can get a couple of degrees
> > resolution on a synchrophasor project.
> You are in luck 100uS is is the range of "easy to do". Setting up
> an NTP servers is a different task from setting up a GPSDXO. One
> does not need a GPSDXO for NTP. The Thunderbolt is likely the lowest
> price GPSDXO but by the time you get an antenna and power suply and
> cables you will have spent abot $300. It will drive an NTP server to
> bette than your 100uS requirement.
> But you can also buy a Motorola "Oncore" series GPS for as little as
> $18 on ebay and it will run NTP just as good as the Thunderbolt. For
> $60 you can buy a brand new Oncore with warenty and tech suport and it
> is an order of magnitude better.
> If budget is important be sure an look at the cost of electric power.
> It is easy to burn up $250 per year of power or even more. Those
> "junker" PCs you find indumpsters are not cheap if you run then 24x7.
> I found a brand new intel Atom powerd machine pays for itself. Use
> a 16GB flash drive or even have it boot off the network and have zero
> local storage.
> Chris Albertson
> Redondo Beach, California
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