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Contents Page
1. Radio technology - The most up-to-date way to keep time 37
1.1 Usable time signal transmitters 38
2. Readiness for use 40
3. Automatic time synchronisation 41
4. Functions 42
4.1 Base mode 44
4.2 Other functions 44
5. Description of watch functions and how to use them 45
5.1 Chronograph stopwatch function with split times 45
5.2 Alarm 47
5.3 Count-down timer 48
5.4 2
nd
time 50
5.5 Reception indicator 52
5.6 Manual time synchronisation (transmitter calls) 53
5.7 Adjusting time zone 54
5.8 Setting the language (day of the week display) 56
6. Restart / getting started 57
6.1 Manual start 58
7. General information 60
8. Technical information 62
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 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.
