[ntp:questions] site with lots of GPS's and accessories

unruh unruh at invalid.ca
Mon Mar 19 00:53:04 UTC 2012

On 2012-03-18, Chris Albertson <albertson.chris at gmail.com> wrote:
> On Sun, Mar 18, 2012 at 1:51 PM, Ron Frazier (NTP) <
> timekeepingntplist at c3energy.com> wrote:
>> Hi all,
>> I was doing some GPS research and found this site with lots of GPS's and
>> accessories.  Just thought I'd pass it along.
>> http://www.gpssensors.com/
>> I don't know which ones are timing GPS's.
> None of them.   If you are looking for a brand new timing GPS and don't
> like buying on eBay, I think the best deal is going to be The M12M because
> Synergy has offered to sell to people on these email lists at a discounted
> price of just below $60.  If you had to pay list price for a new production
> timing unit you'd pay 10X that much.    I don't mind buying older units on
> eBay but I can understand if sue one wanted technical support and a
> warranty and current 2012 state of the art, you don't get any of that on
> eBay.

It depends on what you call a timing GPS. If you want accuracy to
5-10ns, then the above may be true. However if you want something that
will deliver time to 100ns-1us accuracy, then you can buy something like
the Sure GPS for about $35. 
The M12M will give you extras (Position memory which allows a timing
solution from a single sattelite) but if you are running time on a
computer, rather than trying to slave a local atomic clock, it is

The only gps I recognize as having a PPS and thus being a "timing" is
the Garmin 18x OEM  (NOT PC or USB) or 15xL-W

> Here is a link Synergy
> M12M<http://www.synergy-gps.com/index.php?option=com_content&task=view&id=104&Itemid=109>
> You will have to talk directly to them about buying it and ask for the
> reduced price.    I have two of a 15 year old version of this.  I looks
> almost the same.  they have the same 10 pin male header except now they use
> 0.05 inch sping rather then 0.1

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