[time-nuts] 60Hz zero-crossing

Magnus Danielson magnus at rubidium.dyndns.org
Sun Jul 3 20:34:28 UTC 2011


On 07/03/2011 09:37 PM, Tom Van Baak wrote:
> Note looking for a sample 990 to 1010 milliseconds from the last
> sample is a nice way get 1PPS from 60 Hz. This is more immune
> to noise than traditional division-by-60 techniques.
>
> As it turns out, I've gotten clean 1PPS data with no h/w or s/w
> filtering so maybe this whole noise concern is overblown.

You still to time-gating, which in itself is a filtering technique... 
which works very well for known frequency signals.

It can be used in various ways, but it has proven itself useful.

Cheers,
Magnus




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