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

[Bruce Griffiths]

Alexander Sack wrote:
> 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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>
>    
If I remember correctly I think the timing kit was a little under $US200 
or so when I purchased it a few years (March 2005) ago.
The only record I have is the total cost including freight is $NZ336 and 
I not sure what the exact exchange rate was then.

Bruce