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2. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_clock

   A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an " atomic clock ", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock. Such a clock may be synchronized to the time ...

3. DCF77 - Wikipedia

   en.wikipedia.org/wiki/DCF77

   In theory, a DCF77 controlled external clock should be able to synchronize to within one half of the period of the transmitted 77.5 kHz carrier frequency of the DCF77 signal, or within ± 6.452 × 10 −6 s or ± 6.452 microseconds. Reception Consumer grade radio clock movement with the DCF77 receiver (right) in the clock.

4. WWVB - Wikipedia

   en.wikipedia.org/wiki/WWVB

   NIST. March 2010. WWVB is a time signal radio station near Fort Collins, Colorado and is operated by the National Institute of Standards and Technology (NIST). [1] Most radio-controlled clocks in North America [2] use WWVB's transmissions to set the correct time.

5. Time from NPL (MSF) - Wikipedia

   en.wikipedia.org/wiki/Time_from_NPL_(MSF)

   The signal, also known as the MSF signal (and formerly the Rugby clock), is broadcast at a highly accurate frequency of 60 kHz and can be received throughout the UK, and in much of northern and western Europe. The signal's carrier frequency is maintained at 60 kHz to within 2 parts in 10 12, controlled by caesium atomic clocks at the radio station.

6. Time synchronization in North America - Wikipedia

   en.wikipedia.org/wiki/Time_synchronization_in...

   Radio-controlled clock: NIST list of receivers; AC-100-WWVB Time Receiver; AC-500-MSF Time Receiver; ClockWatch Radio Sync; F6CTE's CLOCK; WWV: 2.5, 5, 10, 15, and 20 MHz AM Voice with modified IRIG-Hformat time code on 100 Hz sub-carrier (CCIR code) HF radio and antenna (plus software if automatic updating of computer time is desired)

7. Master clock - Wikipedia

   en.wikipedia.org/wiki/Master_clock

   The master clock (bottom center), controlled by a temperature-compensated mercury pendulum, is wired to slave clocks throughout the building. In addition to wall clocks, it also controls time stamps that are used to stamp documents with the time, and a turret clock used in a clock tower. The "program clock" is a timer that can be programmed ...