[time-nuts] Chooses for a desktop/server NTP external 1PPS reference
Scott Mace
smace at intt.net
Mon Dec 7 23:37:14 UTC 2009
On 12/07/2009 04:13 PM, Alexander Sack wrote:
> Hi Everybody:
>
> First post, be gentle. I did some mail-list archive searching and it seems
> that a lot of folks have used the Garmin 18x LVC as their 1PPS sync for the
> desktop with varied success (5V via USB port and RS-232 for 1PPS?). At
> work, I have experience with an Endrun Cf/Ct receiver connected to a small
> CDMA antennae (as well as GPS receiver) which works pretty well (I suppose
> its more relative to my crappy motherboard oscillator than anything). I
> have no idea how much they run (I think the CDMA one was like $200 and
> something).
>
> What are my options in this realm? Surprisingly enough, Googling for over
> an hour didn't yield much results. There are tons of companies that offer
> various solutions but with little pricing information. I'd be happy to hear
> some suggestions OTHER THAN the Garmin 18x LVC?
>
> (btw is there such a thing as a desktop rubidium atomic clock with 1 PPS?)
>
> Thanks!
>
> -aps
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>
I'm using soekris net4501s that I modified with phk's TMR1IN hack and
running nanobsd 7.2. One is fed with a trimble thunderbolt, one with a
z3801a, and another with either a Fury (which is usually running with a
LPRO-101 Rb unit) or whatever I happen to be experimenting with at the time.
There is a write up here:
http://www.febo.com/pages/soekris/
I did mine similar to this except, I used a mini-din for the second
serial instead of the d-sub, external sma connectors for 10MHz and 1-PPS
inputs, and built the clock synthesizer and pulse stretcher on 'surf
board' prototype PCBs.
Scott
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