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30-Jul-2016 20:29

The time signals, preceded by the callsign "GBR GBR TIME" in morse code, were transmitted during the 5 minutes preceding , , and .Transmitter GBZ on 19.6 k Hz was used as a reserve, when GBR was off-air for maintenance.The signal’s carrier frequency is maintained at 60 k Hz to within 2 parts in 10 A radio station at Rugby was first operated by the Post Office from 1926, with the call-sign GBR.From 19 December 1927, it broadcast a 15.8 k Hz time signal from the Royal Observatory which could be received worldwide.

The MSF signals started in 1950, following the transmission pattern described below.They were originally intended to provide frequency references at 2.5, 5 and 10 MHz, originally only occasionally during the day.