MSF Shutdown

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NPL Time Signal Transmitter

The UK's Most Accurate Time

A scheduled maintenance shutdown of the MSF service to allow safe working on the masts and antennas will take place on 9 September 2021.


The service will be off-air from:

10:00 to 14:00 BST


If the weather is unsuitable for work to be carried out, then the service will not be turned off.

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).

 

The MSF radio signal is a dedicated standard frequency and time broadcast that provides an accurate and reliable source of UK civil time. It is available 24 hours a day across the whole of the UK and beyond.

The signal operates on a frequency of 60kHz 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 signal is transmitted from Anthorn Radio Station in Cumbria by Babcock International, under contract to NPL. The signal covers the whole of the UK and can also be received throughout most of northern and western Europe.

It is monitored against the national time scale UTC(NPL) and corrected when necessary, ensuring that the transmitted time is always correct.