Radio time signals
Ever heard about DCF? Also called DCF77. It is a long wave radio signal broadcasting the time from the atomic clock near Frankfurt, Germany at 77.5kHz.
Also there is HBG, from Switzerland, using the same coding, but at 75khz. Of course british folks have their own thing called MSF at 60khz. It is not compatible with the above.
After collecting these infos, I found out that Wikipedia has most of them already:
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- [Wikipedia: Radio clock|http://en.wikipedia.org/wiki/Radio_clock]
- [Official HBG site|http://www.metas.ch/en/labors/official-time/hbg/index.html]
- [DCF77 abstract|http://www.meinberg.de/english/info/dcf77.htm]
- [Homebuilt DCF recievers|http://www.heret.de/funkuhr/index.htm] (de)
- [A DCF based NTP server|http://ntp.vanheusden.com/]
- [Serial DCF/HBG/MSF/GPS recievers|http://www.gude.info/english/frame-produkte.htm]
- [Availability map of DCF|http://www.gude.info/english/main-dcf77.htm]
- [Availability map of HBG|http://www.metas.ch/en/labors/official-time/hbg/tech_d.html]
Appeared on 20 September 2005, 10:58
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