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1.1 Usable time signal transmitters
Your Junghans Mega MF radio-controlled watch is capable of
fully automatic reception of time signals from the following
transmitters:
– DCF77 in Mainflingen (24km Southeast of Frankfurt am Main)
for Europe
– WWVB in Fort Collins, Colorado (USA) for North America
– JJY40 on Mount Otakadoya (near Tokyo in the North East of
the country) for Japan
– JJY60 on Mount Hagane (in the South West of Japan) for
Japan, the East Coast of China (Peking, Shanghai), South
Korea and parts of Taiwan
1. Radio technology – The most up-to-date way to keep time
5,000 years have passed since timekeeping began with sundials.
In the interim there have been water clocks, the mechanical clocks
of the 13th century and quartz watches. Now we have the radio-
controlled watch.
A watch that in good reception conditions never goes wrong and
never has to be set. The Junghans radio-controlled watch is
absolutely precise, as it is linked by radio frequency to the time
control systems of the most accurate clocks in the world.
For Europe this is the Caesium Time Base at the Physikalisch-
Technischen Bundesanstalt in Braunschweig (Germany’s Institute
of Natural and Engineering Sciences).
For North America it is the U.S. Commerce Department’s Caesium
Time Base at the National Institute of Standards and Technology
(NIST) in Boulder, Colorado.
For Japan the Ministry of Post and Telecommunication’s Caesium
Time Base at the Commercial Research Laboratory (CRL).
All of these clocks are so accurate, that they are expected to
deviate by no more than 1 second in a million years.
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