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Contents Page
1. Radio technology - The most up-to-date way to keep time 35
1.1 Usable time signal transmitters 36
2. Readiness for use 38
3. Automatic time synchronisation 39
4. Functions 40
4.1 Base mode 42
4.2 Other functions 42
5. Description of watch functions and how to use them 43
5.1 Chronograph stopwatch function with split times 43
5.2 Alarm 44
5.3 Count-down timer 46
5.4 2
nd
time 48
5.5 Reception indicator 50
5.6 Manual time synchronisation (transmitter calls) 51
5.7 Adjusting time zone 52
5.8 Setting the language (day of the week display) 54
6. Restart / getting started 55
6.1 Manual start 56
7. General information 58
8. Technical information 60
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 13
th
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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