[GPS_Standard] 1pps acurracy on SiRF Star III?

[Glenn Elmore]

I have used the SiRF II chipset for building some amateur radio GPS 
referenced master oscillators
http://www.sonic.net/~n6gn/extpllpilot.html
with good success.

While I haven't carefully measured (compared) the 1 PPS outputs 
directly, even used with an inexpensive OCXO the resulting 10 MHz 
compares well to a very good OCXO disciplined from other GPS chipsets - 
notably that in the Motorola Oncore that has been so popular in the past.

It appears easy to get to .1 ppb and probably .01 ppb or better this way.

The downside of jitter on the 1 PPS line seems to me to be mainly the 
larger sample size (longer averaging time) required in order to obtain a 
suitably precise reference for the FLL.  If the OCXO being disciplined 
is good enough, this doesn't appear to be much of a problem with any of 
the GPS chipsets' 1 PPS that I  have tried.

Glenn n6gn


On 03/10/2013 09:02 AM, saper wrote:
> Hello,
> I am thinking about building GPS disciplined frequency normal.
> I prefer using a small GPS module like AarLogic GPS 3M
> http://www.roundsolutions.com/shop/products/en/Modules-and-accessories/GPS-Module/AarLogic-GPS-3M-Surface-mount-GPS-module-with-SiRF.html 
>
> Unfortunately, most of these modules is used SiRF III chipset and this 
> have 1pps marked as non for timing aplication.
> Someone you did not measure 1PPS accuracy of SiRF II?
>
> Thanks you
>
>
>
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