Hi, I think this is incorrect, 1/ My ecodrive that I bought in the USA does not run 20% slow here in the UK 2/What about incandesent lamps and those with inverters? 3/ even a cheap crysal is better than than the mains unless you average over days. They vary the frequency (phase) slightly to load share. Robert G8RPI. --- On Wed, 20/4/11, Bill Hawkins <b...@iaxs.net> wrote:
From: Bill Hawkins <b...@iaxs.net> Subject: Re: [time-nuts] 60hz disciplined watch (really?) To: "'Discussion of precise time and frequency measurement'" <time-nuts@febo.com> Date: Wednesday, 20 April, 2011, 19:33 Group, Google can't find anything for "citizen ecodrive watch time sync 60 hz" except a few where the "k" was left out of "60 khz". All of the watches that synched received WWVB at 60 KHz. The claim of 13 millisecond accuracy from line frequency is suspect. There is no control of the power grid to that accuracy. It is not possible. The weekly accuracy is measured in cycles. Variation during the day can be seconds, losing during the day and gaining at night. It seems to me that the filtering algorithm for 60 Hz would have severe underflow problems with floating point math in a low power processor. Bill Hawkins _______________________________________________ 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.