[time-nuts] Chooses for a desktop/server NTP external 1PPS reference

Bruce Griffiths bruce.griffiths at xtra.co.nz
Mon Dec 7 23:56:05 UTC 2009


Scott Mace wrote:
> 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
>> _______________________________________________
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to 
>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>>
>
> 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
The clock stretcher isn't required with an M12M or M12+T as its PPS 
pulse width is 200millisec.

Bruce




More information about the time-nuts mailing list