> deriving exact time to way closer than a second from the signal
To the average consumer if the clock is accurate to within a minute or so they are happy. The clocks also run on a RTC and only use WWVB to keep the RTC more or less accurate. The clocks are also only looking at the carrier level change of a signal somewhere around 60 kHz. The newer BPSK method should be easy to detect in the full power portion of each second. I am in Phoenix and the signal should be fairly strong here even during the day. I know my $15 wrist watch can synchronize during the day if I take it to a window and point it NE toward Ft Collins. When I visit my family in north GA the watch always manages to synchronize back there at 3 am each morning. I bread boarded a RF front end last week end to examine the WWVB signal. I could not see the signal coming out of my RF front end during daylight hours. I was using my spectrum analyzer to monitor the output. But by 10 pm the sine wave was clearly visible and fairly strong. I could easily see the power level drop when it occurred each second. I have ordered more parts from Mouser (better op amps and FET) to improve the performance of the front end. I needed more gain since I am using a modified ferrite rod antenna out of an old AM radio. Hopefully I will have the new design working by this week end. I am going to build a clock that uses the BPSK signal. I am not interested in measuring frequency based on the WWVB signal. I have a GPSDO unit for that. Ray, AB7HE _______________________________________time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
