Description: The Rugby VLF transmitter went in service in 1926 and was originally used to transmit telegraph messages to the Commonwealth. After the 1950s this transmitter, active as callsign GBR (short for Great Britain) on 16 kHz, was used for transmitting coded messages to submerged submarines. A second transmitter was installed for transatlantic telephony but later transformed to the time signal transmitter MSF (Modulated Standard Frequencies - for scientific reference purposes). In 1972 these transmissions were consolidated onto the present frequency of 60 kHz and a further reference, that of a time signal, was added. This highly accurate signal is now used to set many radio controlled clocks. With the shutdown of the GBR transmitter 8 of the 12 masts were obsolete and demolished in 2004.
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