Time and date information is presented in BCD (Binary Coded Decimal) format and is encoded as follows: bits 1-16 are used to convey information about the difference between atomic and astronomical time (DUT1). The other 59 seconds consist of between 100 and 300 milliseconds carrier off and at least 700 milliseconds of carrier on. The data transmitted consists of the current time and date, leap second indicator, daylight saving time indicator and parity bits.Ī 500-millisecond carrier off period indicates the start of each minute. Each data bit is transmitted as one pulse per second. The data is transmitted as on-off carrier modulated, pulse-width coded data signal. Time and date information is transmitted continuously, repeated each minute. Radio receivers should also be located above ground. Additionally, signal reception can be difficult near electrically noise equipment. The radio signal can be blocked by metal structures or frames, which act as a Faraday cage. Reception problems can generally be attributed to local environmental conditions. The MSF-60 radio time signal broadcast can be satisfactorily received throughout the British Isles and much of North-West Europe. When decoded, the MSF-60 time signal provides a highly accurate timing reference for NTP Servers, clocks and other computer timing equipment. From 1st April 2007 the MSF-60 transmission will transfer to Anthorn, Cumbria, using atomic clock and time code equipment provided by VT Communications. The radio signal is maintained by BT Radio Engineering Services under contract from the National Physics Laboratory (NPL). The MSF-60 time signal is a long-wave radio time signal broadcast from Rugby, Warwickshire, England. This article describes how the MSF-60 time signal is decoded by NTP Time Server and computer systems to provide an accurate timing reference. The MSF-60 atomic clock synchronized radio time transmission is utilised by many NTP Time Server and PC computer systems to provide accurate synchronization of time critical applications.
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