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2. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_clock

   A modern LF radio-controlled 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.

3. List of United States clock companies - Wikipedia

   en.wikipedia.org/wiki/List_of_United_States...

   National Time and Signal; Wixom, Michigan (1877–Present)(Introduces the world's first pneumatically controlled master clock system.) New England Clock Company; New Haven, Connecticut (1959–2000) New Haven Clock Company; New Haven, Connecticut (1853–1959) Parker & Whipple; Meriden, Connecticut (1795–1868)

4. Time synchronization in North America - Wikipedia

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

   Radio-controlled clock: NIST list of receivers [19] AC-100-WWVB Time Receiver; AC-500-MSF Time Receiver; ClockWatch Radio Sync [20] F6CTE's CLOCK [15] 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)

5. La Crosse Technology - Wikipedia

   en.wikipedia.org/wiki/La_Crosse_Technology

   La Crosse Technology introduced the radio-controlled clock, commonly (but incorrectly) called an "atomic clock" after the extremely accurate timepiece behind the radio signal it uses as a reference, into the United States commercial market in 1991. [3] [4] In 2004, the company was awarded a license to sell The Weather Channel branded weather ...

6. Master clock - Wikipedia

   en.wikipedia.org/wiki/Master_clock

   Master clock (at left) driving several slave clocks in an enthusiast's garage. The third one from the left at the top is a radio-controlled clock for reference. The master atomic clock ensemble at the U.S. Naval Observatory in Washington, D.C., which provides the time standard for the U.S. Department of Defense. [1]

7. WWVB - Wikipedia

   en.wikipedia.org/wiki/WWVB

   WWVB is a longwave 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.