7.13 The Outputs Screen
53
7.13.7
Slow Code
Selecting slow code causes the output to be held high and go LO for two seconds on the minute,
four seconds on the hour and six seconds on the day.
7.13.8
DCF77 and DCF77 Modified
The DCF77 is a German longwave time signal and standard-frequency radio station.
DCF77
is controlled by the
Physikalisch-Technische Bundesanstalt
(PTB), Germany’s national physics
laboratory and transmits in continuous operation (24 hours). It is operated by
Media Broadcast
GmbH
(previously a subsidiary of
Deutsche Telekom AG
), on behalf of the PTB.
In the Model 1201B/C clocks, DCF77 timing signal is a one-minute time signal produced from
any of the digital outputs, but synchronized to the GNSS time signals and not the German system.
DCF77 Modified is almost identical to DCF77 except that the 59th bit is a 0.5 second pulse instead
of zero. See more detail in Section 9.3.8
Summary of Contents for 1201B
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Page 153: ...B 7 Four Fiber Optic Outputs 135 Figure B 4 Jumper Locations ...
