Thanks guys - interesting answers all! Peter
On 17 September 2016 at 18:00, Chris Albertson <albertson.ch...@gmail.com> wrote: > On Fri, Sep 16, 2016 at 4:44 PM, Peter Vince <petervince1...@gmail.com> > wrote: > > > Can I ask why PPS pulses are so narrow? It makes them difficult to see > on > > a 'scope, and difficult to detect on a PC. And, as Bob said, far less > > obvious if you trigger off the wrong edge. > > > > None of us can guess the original designer's motivation but... > > I think you answered your own question "far less obvious if you trigger off > the wrong edge.". For most cases, except for time nuts, a few > microseconds does not matter. So the GPS PPS works almost as good if you > invert the signal and trip off the wrong edge. Yes it makes such a > mistake hard to find but, I think that was the point. > > > > -- > > Chris Albertson > Redondo Beach, California > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.