The MSF radio signal is a dedicated time broadcast that provides an accurate and reliable source of UK civil time, based on the NPL time scale UTC (NPL). It is available 24 hours a day across the whole of the UK and beyond.
Improving reception
Assuming that the signal is still on, the following suggestions, in order of increasing difficulty, may help to improve reception of the MSF radio signal:
Information on the MSF time signal
The signal operates on a frequency of 60 kHz and carries a time and date code that can be received and decoded by a wide range of readily available radio-controlled clocks.
The MSF radio signal is transmitted from Anthorn Radio Station in Cumbria by Babcock (formerly VT Communications), under contract to NPL.
The MSF radio signal provides a signal strength in excess of 100 microvolts per metre at a distance of 1000 km. This level should be sufficient to allow the time and date code to be received without difficulty, and in all areas of the UK radio-controlled clocks have been found to synchronise correctly to the signal.
Difficulties receiving the MSF radio signal are generally due to a combination of factors. These include attenuation of the signal due to location of the antenna inside a building or close to power lines or other large metal structures, and background interference which may be from a local source such as an electric motor, fluorescent tube, CRT monitor or TV.
If you have reception problems, first check whether the signal has been turned off for maintenance at our MSF Outages page.
As the UK's National Measurement Institute, we have a vital role to play in maintaining the UK's time scale. The current atomic clock system at NPL is the basis of all UK time, and cutting-edge research is being carried out to improve timekeeping accuracy even further.
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