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 -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
