The thing to remember is it's not the actual frequency accuracy that counts so much, it's the synching of phase that does. If they run the grid at 49.3Hz that's fine, as long as every generator is running at that frequency with the same relative phase. TTYL > -----Original Message----- > From: pic microcontroller discussion list > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Nikolai Golovchenko > Sent: Thursday, February 22, 2001 23:31 > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [OT]: Re: [PIC] Timer Tribulations > > > In Ukraine these clocks just don't work correctly. Currently we have > the mains frequency at about 49.3 Hz, and if you assume the frequency > is 50 Hz... :) > > Nikolai > > ---- Original Message ---- > From: Tony Nixon > Sent: Thursday, February 22, 2001 23:49:33 > To: PICLIST@MITVMA.MIT.EDU > Subj: [OT]: Re: [PIC] Timer Tribulations > > > Vasile Surducan wrote: > >> > >> On Wed, 21 Feb 2001, Tony Nixon wrote: > >> > >> > You will find that the clock will drift one way or the other > depending > >> > on temperature, so using the mains as a frequency source is much more > >> > accurate. > >> > >> You are certainly joking ! Or in your country mains > frequency drift is > >> under 0.5% ... > >> > >> Vasile > >> > > > > Perhaps a bit of AC math about power consumption in a system as large as > > a state grid may reveal why power companies try to keep the frequency as > > stable as possible. > > > I'm definitely no expert here, but I'll bet it is definitely in the > > power company's best interest. > > > Upteen million clocks around the world wouldn't be using the principle > > if it was unreliable. > > > > -- > > Best regards > > > Tony > > > mICro's > > http://www.picnpoke.com > > mailto:sales@picnpoke.com > > -- > http://www.piclist.com hint: The list server can filter out subtopics > (like ads or off topics) for you. See http://www.piclist.com/#topics > > > -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics