[time-nuts] Chooses for a desktop/server NTP external 1PPS reference
Alexander Sack
pisymbol at gmail.com
Tue Dec 8 15:19:40 UTC 2009
On Tue, Dec 8, 2009 at 3:01 AM, Robert Atkinson <robert8rpi at yahoo.co.uk> wrote:
> Hi Alexander,
> Welcome to the list.
> Another professional option is the Trimble Accutime Gold. http://www.trimble.com/timing/ The older Accutime 2000 and Palisade turn up on ebay. A desk top box is the CNS Clock II http://www.cnssys.com/cnsclock/CNSClockII.php cost about $3000 complete.
> Some idea on if you want new / professional or used / amateur and if you are a keen constructor would allow more targeted advice.
>
>
Thanks Robert!
Yeah I didn't really specify price or performance metrics in my
request. I think I should document this stuff and write up a
beginner's FAQ (I didn't see anything on LeapSecond.com).
Alright, the reason WHY I didn't actually specify much is because I
really don't know WHAT to look for. I found out today that the
rinky-dinky Endrun Technologies Cf/Ct receivers are 1k each (GPS and
CDMA variants)! I was kinda shocked because there ain't much to these
units AFAIK. So I want to step back for a second (pun intended?) and
ask everyone, WHAT SHOULD I BE LOOKING FOR? Say I want nanosecond
accuracy with respect to the PPS rising edge to absolute UTC....I know
that for sure. My target system is FreeBSD though I would like to use
something with Snow Leopard as well (even if that's just ntpd synced
locally to the FreeBSD box). I am interested in running NanoBSD on a
stand alone system.
As for as assembly, I'm open, though I haven't soldered anything since
undergraduate engineering school in a lab. I am a software guy by
trade.
Another issue is what governs the price of these units? I'd like to
think its not going to be like the audio industry.
Hope that helps,
-aps
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