MSF and DCF radio time synchronisation receivers for network system clock synchronization
MSF & DCF Radio Time Synchronisation Receivers

484 series MSF & DCF radio time code synchronisation receivers

1974 - 2013
39 years of Time Synchronisation

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484 MSF & DCF radio time code receivers

The Wharton 484 series of radio time synchronisation receivers enable the time synchronisation of 400A series clocks, calendar clocks, time zone clocks and master clocks to accurate DCF and MSF radio time code signals.

MSF transmits on 60kHz from Athorn in Cumbria (latitude 54° 55' N and longitude 3° 15' W) with signals traceable to an atomic clock at the National Physical Laboratory. DCF transmits on 77.5kHz from Mainflingen, near Frankfurt/Main in Germany with signals derived from the Physikalish-Technische Bundesanstalt, Lab. Zeitenheit.

In theory the signals are receivable at a range in excess of 1000km from the transmitter, subject to the effect of a wide range of variables such as time of day, atmospheric conditions and the degree of screening between the transmitter and receiver. In practice increasing levels of noise pollution, particularly from mobile radio systems, result in a reduction of reception reliability and we now recommend GPS time synchronisation for time and reliability critical applications.

how radio time synchronisation works to top of page
The MSF and DCF carriers are interrupted every second to encode time and date information with a full time, date and status message being transmitted every minute. The length of the individual carrier breaks determine the value of the coded information and the time of transmission within each minute determines the identity of each bit.

In addition to basic time and date information a 'second level' data set is transmitted during the last few seconds of each minute to provide warning of impending seasonal time changes, summer/winter time status together with parity bits which are used as part of the validation process for each message. At the start of each minute a unique bit pattern is transmitted called the 'minute identifier'.

Due to the possibility of transient interference or reception conditions causing corruption of the transmitted code signal or a total signal loss, the clock or master clocks use the MSF or DCF transmission as an update reference comparison rather than a continuous source of time information.
 
model range to top of page
484.02 & 484.03 The 484.02 (MSF) and 484.03 (DCF) receivers are high performance units with dual crystal filters and dual ferrite antennas to provide omni-directional capability. The units are housed in robust IP65 rated cases suitable for protected external mounting.
  • case size: 160 x 80 x 55mm - 6.3" x 3.1" x 2.2"
484.06 & 484.07 The 484.06 (MSF) and 484.07 (DCF) receivers are low cost units with unidirectional antenna, fitted with a rotating mounting bracket for alignment and intended for internal use. Please note that the 484.06 and 484.07 receivers may not be suitable for use in a building with a steel frame or cladding.
  • case size: 90 x 60 x 24mm - 3.5" x 2.4" x 0.9"
    (excluding mounting bracket)
 
special designs to top of page
If you have a special master clock or radio time synchronisation requirement that is not covered by our standard range of products please do not hesitate to contact our technical department.
 

Copyright 2013 Wharton Electronics Limited. All Rights Reserved
MSF & DCF Radio Time Synchronisation Receivers

Wharton 484 series MSF & DCF radio time code receivers