Thats what I also thought though did not plan to test it. As for mains stability. They are indeed stable over time weeks and months and are corrected. This was a use case for numbers of the austron clocks and freq references. Plus the frequency accuracy is needed for inter-tie networks and power sharing/selling. Regards
On Wed, Apr 20, 2011 at 11:17 AM, Joseph M Gwinn <gw...@raytheon.com> wrote: > time-nuts-boun...@febo.com wrote on 04/20/2011 10:38:41 AM: > > > From: > > > > cook michael <michael.c...@sfr.fr> > > > > To: > > > > time-nuts@febo.com > > > > Date: > > > > 04/20/2011 10:39 AM > > > > Subject: > > > > Re: [time-nuts] 60hz disciplined watch > > > > Sent by: > > > > time-nuts-boun...@febo.com > > > > > > > > > > Le 20/04/2011 16:17, John Ackermann N8UR a écrit : > > > > > > I wonder if it's smart enough to have a sanity check to determine > > > whether the line frequency is 50 vs. 60 Hz? > > > > > > BTW -- I have an Ecodrive watch, but it's radio controlled (as well as > > > > solar charging), so haven't seen any reference to this setting method > > > before. > > > > > > John > > > ---- > > > > > > On 4/20/2011 10:13 AM, paul swed wrote: > > >> My bet would be flicker and divide by 120. Doesn't really matter. But > > > >> since > > >> these watches use the light to charge the battery, sensing the > > >> frequency is > > >> a byproduct. Nice and simple. > > >> > > I don't buy it. Makes a nice urban myth though. Incandescent sources > > don't flicker like fluorescent sources and the Skyhawk user manual does > > not recommend charging in front of flouresecent tubes to > > maintain accuracy. > > There is plenty of 120 Hz (or 100 Hz) ripple on incandescent light. No > fluorescent lamps required. It's easy to test the issue with a photodiode > and a scope. > > Joe > > _______________________________________________ > 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.