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National Research Council Time SignalThe 'National Research Council Time Signal' is Canada's longest running but shortest radio programme. Heard every day since November 5, 1939, at 1:00 PM ET across the CBC Radio One network and at 12:00 PM ET across the SRC Premire Chane radio network, it lasts as little as fifteen seconds. The signal consists of a series of 300-ms "pips" of an 800 Hz sine wave tone between twenty and ten seconds before the hour inclusive, followed by silence, and then a one second-long 800 Hz tone to mark the top of the hour. The CBC time signal is typically delayed by about 300 ms with respect to the CHU time signal, because the actual time signal, which originates from Ottawa, is disseminated to the CBC's radio networks by satellite. The spoken header (the voice varies from station to station) typically reads, "Now, from Ottawa, the National Research Council time signal. The beginning of the long dash following ten seconds of silence, indicates exactly local time here." At the top of many other hours, and at the discretion of each station, a one-second tone is carried, and the hour is not announced. External links A history of pre-CBC time signals Hear the "long dash" of the NRC TS
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