> Just as with WWVB receivers, he does not have to have the GPS powered up very long for and > then only once a week or so to keep the oscillator tuned up. Once a GPS solution has been > found, the local time and the GPS solution time give a time-difference and by remembering > the GPS solution time from the last time you have the /|t you need to calculate the > frequency error. So, a GPS solution could be possible.
I'm curious what the power requirements are. My Casio WWVB wrist watch works on one battery for two years while my Casio GPS wristwatch is lucky to run for more than a two days, even when in intermittent mode. > Depending on which standard you have, the phones only may have a sense of "real" time. > In GSM for instance, the phones traces network time only in a relative aspect, but there > is no real way to get an accurate UTC. The phones is being synchronised to the base This sounds odd to me given that cell phones I've seen can display the date & time and they appear to be accurate to a second. All we need are some counter-examples. Does anyone on this list have a cell phone that displays the time of day with an error greater than a few seconds? (if yours has a HH:MM-only display compare the instant when MM changes). If so, then Mike can scratch cell phones from his list of accurate time sources. By the way, Mike, have you considered if your battery-operated, fob-sized, world-wide, low-cost, synchronization device will be allowed through US airports? /tvb _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts