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| | Atomic Clock Synchronization using the WWVB time signal from Colorado |
 | | Greenwich Mean Time (GMT) was established as the first global time scale in 1884, and its 'atomic' equivalent, UTC, was adopted as the official time for the world in January 1972. |
 | | The 60,000 Hz signal is always transmitted, but every second it is significantly reduced in power for a period of 0.2, 0.5 or 0.8 seconds: • 0.2 seconds of reduced power means a binary zero • 0.5 seconds of reduced power is a binary one. |
 | | The controlling radio signal for the German clock is transmitted via long wave from the DCF 77kHz transmitter at Mainflinger, near Dieburg, some 25 km south east of Frankfurt - the transmitter of German National Time Standards. |
| www.ntp-time-server.com /atomic-clock/atomic-clock.htm (1132 words) |
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