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CHU is the callsign of a shortwave radio station founded in 1929 in Ottawa, Ontario, Canada. It was operated by the Dominion Observatory in Ottawa until 1970 when it was transferred to the Institute for National Measurement Standards of the National Research Council of Canada. The call letters, CHU, were assigned in 1938. Call sign can refer to different types of call signs: Airline call sign Aviator call sign Cosmonaut call sign Radio and television call signs Tactical call sign, also known as a tactical designator See also: International Callsign Allocations, Maritime Mobile Service Identity This is a disambiguation page — a navigational aid...
A Grundig Shortwave receiver Shortwave radio operates between the frequencies of 3,000 kHz and 30 MHz (30,000 kHz) and came to be referred to as such in the early days of radio because the wavelengths associated with this frequency range were shorter than those commonly in use at...
1929 (MCMXXIX) was a common year starting on Tuesday (link will take you to calendar). ...
Template:Hide = Motto: Template:Unhide = Advance Ottawa/Ottawa en avant Established: unknown Area: 2,778. ...
Motto: Ut Incepit Fidelis Sic Permanet (Latin: Loyal she began, loyal she remains) Official languages English (French has some legal status, and is an official language of Canada, but is not fully co-official at the provincial level) Capital Toronto Largest city Toronto Lieutenant-Governor James K. Bartleman Premier Dalton...
1970 (MCMLXX) was a common year starting on Thursday (the link is to a full 1970 calendar). ...
Plaque on the main NRC building in Ottawa. ...
1938 (MCMXXXVIII) was a common year starting on Saturday (link will take you to calendar). ...
Similar in function to WWV / WWVH Like its American counterparts, WWV and WWVH, CHU's signal is used for continuous dissemination of official Canadian government time signals. WWV is the callsign of NISTs shortwave radio station located in Fort Collins, Colorado. ...
WWVH is the callsign of NISTs shortwave radio time signal station in Kekaha, on the island of Kauai in the state of Hawaii. ...
A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day. ...
- Unlike WWV and WWVH, time signals are the only type of information broadcast from this station.
The CHU time signal, as well as the station's transmitted frequencies, are derived from atomic clocks. Atomic clock Chip-Scale Atomic Clock Unveiled by NIST An atomic clock is a type of clock that uses an atomic resonance frequency standard as its counter. ...
- A similar time signal from the National Research Council is used by CBC radio services at noon and 1pm ET each day. (See NRC time signal.)
The Canadian Broadcasting Corporation (CBC), a Canadian crown corporation, is the countrys national radio and television broadcaster. ...
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HF transmission site information
Signal emission format CHU transmits 3 kW signals on 3330 and 14670 kHz, and a 10 kW signal on 7335 kHz. Power kilowatt (symbol: kW) is a unit for measuring power, equal to one thousand watts. ...
A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ...
Amplitude modulation (AM) is a form of modulation in which the amplitude of a carrier wave is varied in direct proportion to that of a modulating signal. ...
In radio communications, a sideband is a band of frequencies higher than or lower than the carrier frequency, containing energy as a result of the modulation process. ...
The International Telecommunication Union uses a special system for classifying radio frequency signals. ...
Location The CHU station itself is located at 45°17′47″N, 75°45′22″W, 15 km southwest of Ottawa. Individual vertical dipole antennas are used for each frequency, similar to WWV and WWVH. WWV is the callsign of NISTs shortwave radio station located in Fort Collins, Colorado. ...
WWVH is the callsign of NISTs shortwave radio time signal station in Kekaha, on the island of Kauai in the state of Hawaii. ...
The electronics systems feeding the transmitters are duplicated for reliability, and have both battery and generator protection. The generator can also supply the transmitters. The announcements are made by a talking clock using digitally recorded voices.
Time Signal Format The actual time signal is a series of 300 ms-long 1000 Hz tones, transmitted once per second, on the second. The top of the minute is marked by a half-second-long beep, and the top of the hour is marked with a one second-long beep, followed by nine seconds of silence. Thereafter, every second except for the 29th second past the minute, CHU transmits a 300-millisecond tone. Between one and sixteen seconds past the minute, CHU transmits the difference between UT1 and Coordinated Universal Time (UTC), in much the same way that the value is transmitted on WWV, but with split tones instead of doubled "ticks". Universal Time (UT) is a timescale based on the rotation of the Earth. ...
Coordinated Universal Time or UTC, also sometimes referred to as Zulu time or Z, is an atomic realization of Universal Time (UT) or Greenwich Mean Time, the astronomical basis for civil time. ...
Between 31 and 39 seconds past the minute inclusive, the once-per-second tones are reduced to 10-millisecond "ticks" while a digital time code is transmitted. The digital time code used by CHU is unique, in that it is decodeable by a Bell 103-compatible modem. The Bell 103 modem was the first commercial modem for computers, released by AT&T in 1962. ...
At ten seconds before each minute, the once-per-second tones are again cut to 10 milliseconds each, this time while CHU transmits a brief voice station identification, followed by voice announcements of the next minute in UTC, alternating between French and English. French announcements are transmitted first on the odd minutes, while English announcements come first on the even minutes. The English language is a West Germanic language that originates in England. ...
Signal Coverage CHU very often cannot be received in Western Canada (at all) on any frequency, sometimes simply because of the significant level of noise produced by the electrical wiring in a building.
It is hoped that in the future, a companion time signal station might be created to transmit on adjacent frequencies to Western Canada.
British Columbia is an ideal site for CHU 2nd transmitter Motto: Splendor Sine Occasu (Latin: Splendour without diminishment) Official languages none stated in law; English is de facto Capital Victoria Largest city Vancouver Lieutenant-Governor Iona Campagnolo Premier Gordon Campbell (BC Liberal) Parliamentary representation - House seat - Senate seats 36 6 Area Total • Land • Water (% of total) Ranked 5th 944,735...
- There are combined benefits here for both the oil and gas industry and the Canadian Navy.
- The mountainous terrain may cut off 24 hour CHU reception from the Ottawa transmitter site.
- Source: http://cbc.am/CHU.htm
Proposed CHU transmitter for Western Canada
Template:Hide = Motto: Template:Unhide = Advance Ottawa/Ottawa en avant Established: unknown Area: 2,778. ...
A radio clock A radio clock is a clock that is synchronized by a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock. ...
BPM is the Peoples Republic of Chinas national time signal service, operated by the Chinese Academy of Sciences. ...
DCF77 is a longwave time signal radio station. ...
GPS satellite in orbit, image courtesy of NASA GPS redirects here. ...
HBG Prangins is a large transmission facility near Prangins, Switzerland. ...
JJY is the callsign of a longwave time signal radio station similar to WWVB. The station is located in Japan, operated by a branch of the Japanese government known as the National Institute of Information and Communications Technology. ...
The MSF time signal is a broadcast from the VLF transmitter Rugby near Rugby, Warwickshire based on time standards maintained by the British National Physical Laboratory. ...
RWM is the callsign of a shortwave radio station in Moscow, Russia. ...
VNG was Australias national time signal service, and operated on 2500, 5000, 8638, 12984, and 16000 kHz. ...
WWV is the callsign of NISTs shortwave radio station located in Fort Collins, Colorado. ...
WWVB is a special NIST time signal radio station in Fort Collins, Colorado, co-located with WWV. WWVB is the station that radio-controlled clocks throughout North America use to synchronize themselves. ...
WWVH is the callsign of NISTs shortwave radio time signal station in Kekaha, on the island of Kauai in the state of Hawaii. ...
YVTO is the callsign of the official time signal from the Juan Manuel Cagigal Naval Observatory in Caracas, Venezuela. ...
See also - CHU webpage at the INMS/NRC.
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