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    R: Radio Synchronized Clock
    From: Gennaro Sammarco
    Date: 2002 Feb 28, 19:08 +0100

    Oregon Scientific has some model available for the european market, based on
    a signal departing from Frankfurt, Germany. Latest model seem having very
    little problem getting it, compared to previous more difficult to tune
    (automatically, no manual back up, but I suppose the signal is now been
    strenghtened), and the station range is declared to be up to 2500 km, so it
    works here in the Med.
    fair winds
    Gennaro Sammarco
    > -----Messaggio originale-----
    > Da: Navigation Mailing List
    > [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM]Per conto di Dan Allen
    > Inviato: giovedi 28 febbraio 2002 18.53
    > Oggetto: Re: Radio Synchronized Clock
    > I found at nice stainless-steel cased wall clock at Ikea for $15
    > a year or two ago (they don't have them any more, alas), and it is
    > radio synchronized.  They change at midnight and have a button on
    > the back for the 4 main US time zones.  They automatically change
    > for Daylight Savings time.  The signal that they use is NOT WWV
    > but WWVB at 60 kHz.
    > More info on WWVB can be found at:
    > http://www.boulder.nist.gov/timefreq/stations/wwvb.htm
    > WWVB barely covers North America and it depends upon the time of day:
    > http://www.boulder.nist.gov/timefreq/stations/wwvbcoverage.htm
    > I think there may be other radio stations similar to WWVB.  I
    > would expect that if there are similar stations broadcasting in the
    > same format and frequency that my $15 clock would work
    > world-wide, but with the time zones being off (not a major problem).
    > -----Original Message-----
    > From: Navigation Mailing List
    > [mailto:NAVIGATION-L{at}LISTSERV.WEBKAHUNA.COM]On Behalf Of Jared Sherman
    > Sent: Thursday, February 28, 2002 9:05 AM
    > Subject: Re: Radio Synchronized Clock
    > Dov-
    >  This (correcting a quartz count) was implemented around 1980 in
    > a totally sealed diving watch which I think came out under the name
    > "Pulsar" before the new company of that name. It was a
    > hermetically sealed watch, solar cells for the 'face' and an LED
    > display on
    > the 'shoulder' of the face. Besides the time set buttons it also
    > offered a calibration/adjustment mode, since there was no way to
    > open the watch for internal adjustment.
    >  Since then watch accuracy has improved, typically better than
    > +-15 seconds a month which is well beyond what the mass market pays
    > atttention to. I don't see any market incentive for a
    > manufacturer to do better, unless you buy the Casio GPS watch
    > which will put
    > the accuracy of 16 atomic clocks on your wrist--without your need
    > to manually adjust it.
    >  I've been told the radio watches use a power conservation
    > algorithm. They only turn on the receiver circuit near midnight (when the
    > WWV signal should be propogating, etc. at its best) and try to
    > correct themselves once every 24 hours. If they miss the correction,
    > then they become more agressive about turning on and seeking it.
    > This may vary with manufacturers of course...but in any case the
    > watch would only need to see "sky" once daily, since the typical
    > quartz accuracy of +-15 sec/month means it will still be within 1/2
    > second of "right" for the rest of the day.

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