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.