[ntp:questions] PC DCF-77 signal emulation?

Uwe Klein uwe_klein_habertwedt at t-online.de
Wed Sep 9 07:57:50 UTC 2009

Pete Ashdown wrote:
> I've bought a number of clocks from Germany that use DCF-77 for time
> set/synchronization.  Needless to say, here in the states I can't use DCF-77.
> I have see a number of GPS -> DCF-77 converters, but since I have a GPS synced
> NTP server, I'd rather just pull time from the client Linux box next to my
> desk.  Does anyone have or know of a USB or serial device that can output a
> DCF-77 signal to a number of clocks (4)?

a generic serialport sending with 50 or 25 Baud that switches a 77.5kHz modulation
signal to 75% ?
( and a little bit of code that sends the DCF code bits every second )

 > http://en.wikipedia.org/wiki/DCF77


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