[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
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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
The clock stretcher isn't required with an M12M or M12+T as its PPS
pulse width is 200millisec.
Bruce
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