The "Rugby" MSF Time Source moved from Rugby to Cumbria in 2007. For those in the South of England, the signal strength is now much lower, and an MSF Clock requires much better siting than before. Schools and Office Blocks are finding that a clock buried deep inside the building will not get a "lock" from the Cumbria signal. If you are in the South of England, a good way to check this is to take a "Klik" Clock to a high point in the building - facing North (-ish), and replace the battery. The Clock should now whizz around, and stop at 4:00, 8:00 or 12:00. Wait for a few minutes, and it will whizz around again - maybe several times - before eventually stopping at the correct time. Now take the Clock back to it's required position. If it keeps the correct time over a period of a week or more - all is well. Battery "Radio Controlled" Clocks are not permanently "connected" to MSF - the time is only checked maybe once an hour, every two hours, or every four hours, in the meantime they run on their own internal reference. So, if after a few days the Clock starts to slip plus or minus a few seconds, then the MSF signal strength is not high enough, and there is little to be done about this except reset the Clock from a higher signal strength position.
Peter Knight, August 2020
