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	Sangean RCR-22 AM/FM Atomic Clock Radio List Price: $79.99 Sale Price: Too low to display Used From: $51.43 Average Rating:
	Sangean's RCR-22 Clock Radio is the atomic clock radio you can set once and forget. It connects to the atomic clock in Boulder, Colorado to set the most accurate time available. Once the clock is set you can program the dual alarms to wake to your favorite AM or FM station...

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Ntp - Using an Atomic Clock Receiver for Time Synchronisation

Atomic clocks are the most accurate timekeeping devices developed by man. Modern atomic clocks are so accurate that even in 100 million years less than a second of time would be lost.

This accuracy makes them ideal references for a NTP server (Network Time Protocol). NTP is a protocol widely used to synchronize computer networks across the Internet of local Area Network (LANs).

This article explains how to synchronise a computer network using NTP to an atomic clock source.

Atomic clocks are so accurate that a universal timescale has been developed called UTC (Coordinated Universal Time) that is based on the time told by atomic clocks. UTC is globally used and is the same everywhere enabling different computer networks to be synchronized to the same time.

Unfortunately atomic clocks are hugely expensive, extremely delicate and quite bulky pieces of equipment, so they are only really to be found in large scale physical laboratories or in highly technical pieces of equipment such as satellites.

Fortunately a dedicated NTP server can synchronize to UTC time using an atomic clock as a reference source by either making us of the national time and frequency transmissions or the GPS (Global Positioning System) network.

Many national physics laboratories such as NPL in the UK, NPL in Germany and NIST in the USA, broadcast a UTC time reference on long wave radio transmission. These signals can be picked up by a NTP server using a radio receiver. Unfortunately the radio transmissions are not broadcast by every country and the signals are finite.

Fortunately the constellation of satellites that make up the USA’s GPS network all have an onboard atomic clock. This signal is used by satellite navigation receivers to work out location but can equally be used by a GPS NTP server as a timing source.

Using either a radio referenced NTP server or GPS time server, synchronization to within a few milliseconds of UTC is possible.

About the Author

Richard N Williams is a technical author and specialist in atomic clocks, telecommunications, NTP and network time synchronisation helping to develop dedicated NTP clocks. Please visit us for more information about a network time server or other ntp server solutions.

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	Sangean RCR-22 AM/FM Atomic Clock Radio List Price: $79.99 Sale Price: Too low to display Used From: $51.43 Average Rating:
	Sangean's RCR-22 Clock Radio is the atomic clock radio you can set once and forget. It connects to the atomic clock in Boulder, Colorado to set the most accurate time available. Once the clock is set you can program the dual alarms to wake to your favorite AM or FM station...

	Sangean RCR-10 Black AM/FM/RDS Digital Atomic Clock Radio with iPod Dock (Black) List Price: $129.00 Sale Price: $129.00
	AM/FM/RDS Digital Atomic Clock Radio with iPod Dock, Byattery Back Up.

	Oregon Scientific RMR382-B Wireless Indoor/Outdoor Thermometer with Atomic Clock, Black List Price: $29.99 Sale Price: $12.50 Average Rating:
	Stylish temperature and timeMonitors the indoor and outdoor temperature from up to three remote locations and automatically sets itself to the US Atomic Clock signal.Monitors the indoor and outdoor temperature using wireless sensorAutomatically sets itself to the U...

	Sangean RCR-2 Digital Atomic Clock Radio with Dual Alarms List Price: $99.99 Sale Price: Too low to display Average Rating:
	This modern clock radio is a step above the clock radios of the past. For starters, the radio updates its time automatically from the U.S. atomic clock in Boulder, Colorado. While this may force you to work or school on time, the benefits of a constantly updated timepiece are critical in this fast-paced world...

	Oregon Scientific BAR388HGA Wireless Weather Station with Atomic Clock, Black List Price: $49.95 Sale Price: Too low to display Used From: $38.99 Average Rating:
	Stylish Forecasting and Timing!! Forecasts the weather 12-24 hours in advance with three levels of pressure and temperature indicators: Rising, Steady or Falling. Displays indoor and outdoor temperature and humidity, and provides comfort level and heat index indicators...

	Sharp SPC364 Atomic LCD Bedside Alarm Clock (Silver) List Price: $12.99 Sale Price: $6.19 Average Rating:
	The Sharp SPC364 Atomic LCD Bedside Alarm Clock will give you the most accurate times available anywhere. An easy-to-read 0.5-inch LCD display, with a back light for nighttime viewing, ensures that you'll always know exactly what time it is...

	Honeywell TE242ELW Personal Weather Station with Atomic Clock and Dual Alarm List Price: $29.99 Sale Price: Too low to display Average Rating:
	With a new double-tool design, the Honeywell TE242ELW Personal Weather Station with Atomic Clock and Dual Alarm boasts an elegant glossy finish that is perfect for modern decors. The Honeywell TE242ELW is the quickest, most accurate, and most convenient way of keeping track of the weather in and around your home or office...

	Equity by La Crosse SkyScan 31981 Atomic Bedside Clock List Price: $14.99 Sale Price: $8.99 Used From: $7.99 Average Rating:
	Our lowest priced Atomic Clock sets itself automatically by receiving and decoding the NIST radio signal from the Atomic clock in Fort Collins ,Colorado.The clock checks itself daily to give you the most accurate time available...