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Radio-controlled clocks can then apply time zone and daylight saving time offsets as needed to display local time While most time signals encode the local time of the broadcasting nation, the United States spans multiple time zones, so WWVB broadcasts the time in Coordinated Universal Time (UTC). Thing is, they may all use a different time code. Japan also transmits a time signal on this frequency (as does Russia and the UK) and broadcasts at 50 kW ERP. WWVB in Fort Collins broadcasts on 60 kHz at 70 kW. On the flip side, your clock may be designed to receive a low-frequency broadcast. Possibly WWVH upgraded their transmitter recently? Hawaii does not observe Daylight Savings Time - and neither does your clock. NIST also operates a time-signal station, WWVH, in Kekaha, Hawaii. ![]() ![]() As seawater is more conducive to extending the range of shortwave broadcasts than land, chances are pretty good that the signal is originating offshore. Your being near the west coast/Pacific Ocean suggests that the 'new signal' is coming from somewhere offshore. It is quite possible that a new station has come online somewhere, one whose signal strength at your location surpasses the signal from WWV in Fort Collins, Colorado. ![]() There are other time-signal stations around the world. Shortwave frequencies are capable of notoriously long range. These 'atomic' clocks (radio clocks, more accurately) depend on shortwave broadcasts of time signals.
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