[time-nuts] Low cost GPS module for < 100ns timestamping error

Tony tnuts at toneh.demon.co.uk
Fri May 2 21:38:07 EDT 2014


On 03/05/2014 00:59, EWKehren at aol.com wrote:
> Welcome to the nuts Tony

Thanks, Bert.

> You are not specifying exactly how accurate time has to be but in my book
> and based on tests the most reasonable priced GPS with 1 pps is a 
> Ublox 6M
> that  you can get with antenna for less than $ 22 antenna included from
> _www.DX.com_  (http://www.DX.com) . They have volume discount. 
> Shipping is  very
> slow but included. They seem to be presently out of the 1 pps version but
> all ublox units have a 1 pps output and I use with and without and all 
> I do is
>   solder a wire to pin 3.
> Bert Kehren

As I said in my first post I'd like to achieve an accuracy of better 
than 100ns - or 50ns if possible at reasonable cost.

I had come across the Ublox 6M when I was looking earlier, but I 
misunderstood the data sheet and thought it was only the expensive 
($135) LEA/NEO-6T versions which provided timing. Definitely worth a 
closer look - the NEO-6M is specced at 30ns RMS which is good enough. 
The power consumption is a little higher than I would have liked  at 
37mA/3V, but still rather less than others.

Thanks,
       Tony



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