The MSF time signal is a broadcast from the VLF transmitter Rugby near Rugby, Warwickshire based on time standards maintained by the British National Physical Laboratory. The transmitted signal has an ERP of 15 kW, on a frequency of 60 kHz, the same frequency used by WWVB.
MSF is a radio callsign, and not an abbreviation. 'M' is one of the prefixes allocated to the United Kingdom, and the letters 'SF' were randomly allocated. However, Post Office staff that operated the station in 1951 insist that the name derives from the Modulated Standard Frequency scientific reference transmissions started in that year.
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