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1. Radio technology – The most up-to-date way to keep time
5,000 years have passed since timekeeping began with sundials. In the inte-
rim 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 Bun des anstalt 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.
Contents Page
1. Radio technology – The most up-to-date way to keep time 29
1.1 Usable time signal transmitters 30
2. Readiness for use 32
3. Automatic time synchronisation 33
4. Functions 35
5. Selectable LCD displays 37
6. Description of watch functions and how to use them 37
6.1 Addition timer function 37
6.2 2
nd
Time 38
6.3 Reception display 38
6.4 Manual time synchronisation (transmitter calls) 39
6.5 Time-zone settings 41
6.6 Set language (day of the week display) 42
7. Re-starting after changing battery 42
7.1 Manual start 43
8. General information 45
9. Technical information 47
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