[ntp:questions] best gps receiver for time synchronization

David J Taylor david-taylor at blueyonder.not-this-part.nor-this.co.uk.invalid
Tue May 12 18:32:37 UTC 2009

Unruh wrote:
> "David J Taylor"
>> On my system, I can detect no difference between the GPS 18 and the
>> GSP 18x.  I am looking at jitters in the order of 2.2 microseconds,
>> and offsets in the range +170/-100 microseconds.
> How are you reading the PPS interrupts>. That offset is terrible. On
> my PPS feeding a parallel interrups, the offsets are less than 10us.

This is a Windows system, Bill.  I know I would do far better with a 
FreeBSD system (I used to get better than 20microsecond offsets), but I'm 
able to run one PC less now, by having a Windows PC as my stratum-1 

The offset is more than good enough for my purposes.


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