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[HCDX] CHU to 7850 January 1
** CANADA. Hello Glenn, Well, the day has come when the frequency of CHU will be changed. The change goes into effect January 1, 2009.
Below is the text that will appear on our web site.
Have a happy holiday. Raymond Pelletier
============================================
Frequency and Time
Institute for National Measurement Standards
National Research Council Canada
M-36, room 1026
1200 Montreal Road
Ottawa, Canada K1A 0R6
Tel: (613) 993-3430
Fax: (613) 952-1394
raymond.pelletier @ nrc-cnrc.gc.ca
Government of Canada
========================================
CHANGE YOUR SHORTWAVE RADIO DIAL
After seventy years of broadcasting Canada's official time, NRC's
shortwave station CHU will move the transmission frequency for the 7335 kHz transmitter to 7850 kHz. The change will occur on 01 January 2009 at 0000 UTC.
CHU is a part of NRC's system for disseminating official time throughout Canada, broadcasting 24 hours a day from a location approximately 20 km south-west of Ottawa. Listeners hear tones to mark the seconds, voice to announce the time in French and English, and digital data to set computers.
The atomic clocks at CHU are part of the ensemble of clocks in the time and frequency research laboratories in Ottawa, at the National Research Council Canada. The NRC clocks are used in conjunction with clocks in the time laboratories of other countries to construct the
internationally accepted scale of time, UTC (Coordinated Universal
Time), which is now the reference for official time used by all
countries. UTC is the modern implementation of Greenwich Mean Time.
"Coincidentally, this frequency change comes at a time when NRC is
investing resources to refurbish the aging transmitters at CHU in order to provide clear, dependable shortwave services as part of NRC's mandate to disseminate time to all Canadians." said Ray Pelletier, Technical Officer at the NRC-Institute for National Measurement Standards, who oversees the CHU facility "The shortwave time service is especially beneficial for those in remote locations where there is limited access to internet and telephone communication. CHU also provides a back up against failure of other services."
In April 2007, the International Telecommunications Union re-allocated
the 7300-7350 KHz band from a fixed service to a broadcasting service.
Since then, interference on the 7335 KHz frequency has come from many
information broadcasters around the world.
CHU listeners in Canada and around the world who have for so long
considered the 7335 kHz frequency exclusively for time signals, are very vocal about this interference. We have heard from amateur radio
operators, watchmakers, astronomers, and navigators who use the tones
and voice signals. As well, comments were received from those who use
the carrier as a calibration source at a distance for their equipment.
To give notice to users, CHU will broadcast an announcement in both
English and French. More information can be found at
http://www.nrc-cnrc.gc.ca/main_e.html and
http://www.nrc-cnrc.gc.ca/main_f.html
Comments about the CHU change can be sent by e-mail to
radio.chu@xxxxxxxxxxxxxx
(Raymond Pelletier, CHU, DX LISTENING DIGEST)
As of Dec 9, nothing at above site about 7850. This NRC website also mentions a leap second to be added at the end of 2008y: http://time5.nrc.ca/timefreq/bulletin_tf-b.html (gh)
Monitored around 1430 UT Dec 9 on 7335, no announcements being heard yet about the frequency change or the leap second.
And here`s another website with the history of CHU, etc.:
http://inms-ienm.nrc-cnrc.gc.ca/time_services/shortwave_broadcasts_e.html
(Glenn Hauser, DX LISTENING DIGEST)
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