For generations of Canadian radio listeners, hearing the steady tones of CHU was part of the soundscape of shortwave radio. Whether you were a ham operator checking propagation, a shortwave listener tuning the bands late at night, or simply someone fascinated by precision timekeeping, CHU represented something uniquely Canadian: a direct connection to the nation’s official atomic clock service.
Now, another chapter in Canadian radio history is coming to an end. This comes on the heels of earlier news that Environment and Climate Change Canada has permanently discontinued the Weatheradio Canada service.
The National Research Council of Canada (NRC) has announced that the shortwave broadcast of Canada’s official time signal station CHU will be discontinued on June 22, 2026. (National Research Council Canada)
For radio hobbyists, this feels strikingly similar to the recent announcement that Environment Canada’s Weatheradio VHF network will also be shut down in 2026. Both services were once essential infrastructure for Canadians living in remote areas, mariners, pilots, emergency communicators, and radio enthusiasts. Today, they are increasingly viewed as legacy systems in an era dominated by internet-connected devices and GPS-based timing.
The End of CHU: Canada’s Official Shortwave Time Signal Goes Silent in 2026
Still, their disappearance marks the end of an important era in Canadian radio.
What Was CHU?
National Research Council Canada station CHU was one of the world’s best-known shortwave time signal stations. Operating continuously from near Ottawa, Ontario, CHU transmitted official Canadian time signals on three frequencies:
- 3330 kHz
- 7850 kHz
- 14670 kHz
The station broadcast 24 hours a day using atomic-clock-derived timing signals. Listeners would hear precise one-second ticks, minute markers, bilingual voice announcements, and digital time codes. (National Research Council Canada)
Unlike ordinary broadcast stations, CHU served a technical purpose. Engineers, researchers, surveyors, broadcasters, radio operators, and hobbyists used it to synchronize clocks and calibrate equipment with remarkable precision.
If propagation conditions were good and delays were accounted for, CHU could deliver timing accuracy better than one millisecond. (National Research Council Canada)
For decades, CHU was Canada’s equivalent to the American WWV and WWVH time stations operated by NIST in the United States.
A Radio Service Dating Back More Than 100 Years
The roots of CHU stretch all the way back to the early 1920s. Experimental Canadian time broadcasts began in 1923 under the callsign 9CC before evolving into VE9OB and eventually CHU in 1938. (National Research Council Canada)
In many ways, CHU was one of the earliest examples of public technical broadcasting in Canada.
Long before the internet, GPS, or even reliable nationwide telephone service, accurate time distribution was critical. Railways, scientific observatories, broadcasters, navigators, and military operators all depended on synchronized clocks.
Shortwave radio solved that problem beautifully. A powerful signal from Ottawa could be heard across much of Canada and beyond, especially at night when HF propagation improved.
Over the decades, CHU modernized repeatedly:
- quartz oscillator control in the 1930s
- bilingual voice announcements in the 1960s
- cesium atomic clocks in the 1960s and 70s
- digital time code transmission for computer synchronization
- frequency adjustments to avoid international interference
Yet despite all the upgrades, the core experience remained remarkably unchanged. Tune to CHU, hear the ticks, and know you were listening to Canada’s official time.
Why Is CHU Being Shut Down?
The NRC has not published a lengthy explanation, but the broader trend is obvious: modern timing infrastructure no longer depends on shortwave radio.
Today, nearly all timing synchronization occurs through:
- GPS satellite systems
- internet NTP servers
- cellular networks
- digital telecommunications infrastructure
The NRC already distributes official time online through internet time servers and telephone services, which will continue operating after CHU goes silent. (National Research Council Canada)
From a government perspective, maintaining aging HF transmission equipment for a shrinking audience likely became difficult to justify.
CHU also suffered from limitations that became more apparent over time:
- inconsistent reception in western Canada
- susceptibility to ionospheric conditions
- urban RF noise interference
- relatively low transmitter power compared to historic international standards
Even so, the station remained beloved within the radio community precisely because it was old-school radio technology still doing a real-world job.
Another Canadian Radio Institution Fades Away
The closure of CHU follows several other Canadian radio-era shutdowns.
In 2023, the CBC ended its famous daily National Research Council time signal broadcast — the iconic “long dash” heard on CBC Radio for more than 80 years. (Radio World)
Now CHU itself is disappearing.
Combined with the announced shutdown of Environment Canada’s Weatheradio VHF network, it paints a clear picture: Canada is steadily retiring legacy public radio infrastructure that once played a vital role in national communications.
For radio hobbyists, these services represented more than utility. They were living artifacts from an earlier technological era when radio waves connected vast geographic distances in elegant and surprisingly resilient ways.
You could lose internet access, cellular service, and power — yet still hear CHU ticking away on a battery-powered shortwave receiver.
That kind of infrastructure feels increasingly rare today.
Why CHU Mattered to Radio Hobbyists
For shortwave listeners, CHU was often one of the first stations newcomers tuned in successfully.
The station’s distinct ticking sound made it easy to identify. It was also useful for testing antennas, checking propagation conditions, comparing receivers, and demonstrating shortwave reception to newcomers.
Ham radio operators frequently used CHU to verify dial calibration and frequency accuracy.
Some listeners collected CHU QSL cards over the years, turning simple reception reports into treasured radio memorabilia. Others simply enjoyed the comfort of hearing a familiar Canadian signal during late-night tuning sessions.
Unlike commercial broadcasters, CHU had no politics, advertising, or entertainment programming. It existed solely to provide accurate time.
Ironically, that simplicity became part of its charm.
The End of an Era for Canadian Shortwave
Canada was never a massive shortwave broadcasting nation compared to countries like the United States, Russia, China, or the United Kingdom. But CHU was one of the country’s most recognizable radio signals internationally.
Its closure represents another reminder that shortwave broadcasting itself is fading globally.
Many international broadcasters have already left the bands:
- Radio Canada International shut down its Sackville shortwave site in 2012
- Australia Radio ended shortwave domestic services
- Numerous European broadcasters reduced or eliminated HF transmissions
CHU survived long after many expected it would.
That alone makes its upcoming shutdown significant.
What Happens After June 22, 2026?
After the shutdown date, listeners tuning to 3330, 7850, and 14670 kHz will simply hear silence where CHU once operated. (National Research Council Canada)
The NRC says official Canadian time will still be available through internet and telephone-based services. But for shortwave listeners, the experience will not be the same.
There is something fundamentally different about receiving a direct radio signal bouncing through the ionosphere from an atomic-clock-controlled transmitter.
Once CHU disappears, Canada will lose one of its last continuously operating technical shortwave services — and another piece of radio heritage will quietly fade into history.
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