[ntp:questions] Sure Electronics GPS board: Amazing performance. :-)

unruh unruh at wormhole.physics.ubc.ca
Fri Apr 1 06:58:56 UTC 2011

On 2011-03-31, Chris Albertson <albertson.chris at gmail.com> wrote:
> On Thu, Mar 31, 2011 at 8:19 AM, unruh <unruh at wormhole.physics.ubc.ca> wrote:
>> For general useage, the garmin 18 is still probably the easiest bet.
>> While it does require soldering on power (eg usb) and a serial port,
>> that soldering is relatively easy to do, and the documentation on the
>> gps18 is far ?superior. It is about twice the price.
> I'd have to say the Motorola Oncore UT+ is the easiest to use.  All
> the connections are to  0.1" pitch male header pins so there is no
> need for solder.  The UT+ sells for about $16 on ebay.  The
> documentation is exhaustive and complete and written in "standard
> English".   And of course the UT is very accurate with a standard
> deviation in the PPS of about 49 nS.

That is certainly far more accurate than you can get the time into a
computer-- even directly timestamping an interrupt is about 1usec with
fluctuations of 1 usec or more.  
> The newest version of this GPS is the M12M sold by Synergy Systems.
> It sells in qty 1 for $60 and comes with tech support from a US
> company and has PPS arcuate at the 2nS level.   I'll buy this one next
>  I don't think the dps18 comes even close to 2ns.

Where do you buy it from? 
Is that without the antenna and power supply?


> Here is the data sheet.
> http://www.synergy-gps.com/images/stories/pdf/m12mt_brochure.pdf

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