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

Alexander Sack pisymbol at gmail.com
Mon Dec 7 23:29:11 UTC 2009


On Mon, Dec 7, 2009 at 6:07 PM, Bruce Griffiths
<bruce.griffiths at xtra.co.nz> wrote:
> Alexander Sack wrote:
>>
>> On Mon, Dec 7, 2009 at 5:20 PM, Bruce Griffiths
>> <bruce.griffiths at xtra.co.nz>  wrote:
>>
>>>
>>> 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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>>>>
>>>>
>>>
>>> A Soekris 4501 running nanobsd using an M12+T or M12M GPS timing receiver
>>> works very well.
>>> Failing that an M12+T or M12M GPS timing receiver also works well with a
>>> desktop machine that runs FreeBSD.
>>>
>>
>> Yeah I'm running FBSD (actually that's my day job).  What's the
>> M12+T/M12M, is that a Motorola substance?  Linky-link?
>>
>> -aps
>>
>>
>>
>
> The M12+T is a Motorola GPS timing receiver (can be picked up on ebay) but
> requires an CMOS- to RS232 transceiver chip and a few other parts as well as
> an active GPS antenna.
> The iLotus M12M is the replacement and can be purchased from Synergy GPS
> complete with a suitable motherboard and puck style antenna.
> A GPS timing antenna (eg VIC100) with integral 1575MHz bandpass filters is
> more resistant to interference.
>
> http://www.synergy-gps.com/index.php?option=com_content&task=blogcategory&id=32&Itemid=116
> <http://www.synergy-gps.com/index.php?option=com_content&task=blogcategory&id=32&Itemid=116>
>
> for the M12M timing starter kit which has everything needed to get you
> started.
> later depending on your location you may want to upgrade to a timing
> antenna:
>
> http://www.synergy-gps.com/index2.php?option=com_content&do_pdf=1&id=139
> <http://www.synergy-gps.com/index2.php?option=com_content&do_pdf=1&id=139>

Very cool.  Bruce, would you happen to know of pricing (round about)?

-aps




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