Radio controlled watches
Every clock must be set in some way. As a rule, this happens manually by means of a small wheel that sets the time mechanically or digitally by a small button. Since there have been clocks, there has always been the call for a clock that can set itself and that always runs accurately. To always appear punctually and never miss a deadline, a maxim, which not everyone manages to meet, since the clock is not running correctly again. The solution to the puzzle lies in the radio controlled watch.
When does one talk of a radio controlled watch?
A radio controlled watch usually means a quartz clock, whose time is checked in regular intervals and if necessary, corrected. The clock receives a signal by radio that communicates the time. This is compared with the current time of the clock and is then corrected as needed. Radio controlled watches that are not digital have a motor built-in that can set the correct time faster than the actual running speed. Due to advanced technology, there are radio controlled watches in all imaginable colors, shapes and sizes, since the technical part can be kept very small.
History and development
Since there is Coordinated Universal Time, there is an institution in many countries, which is charged with determining the present time. In Germany, the Physikalisch-Technische Bundesanstalt (National Metrology Institute)in Braunschweig is responsible for it. Since 1977, the Institute broadcasts the current time over the DCF77 transmitter on a frequency of 77.5 kHz. The time can be received in the region 2000 km around Mainflingen at Frankfurt am Main, office of the Institute. At first, only large clocks were capable of receiving the signal. It was only possible for companies and wealthier people to take advantage of the radio controlled watch. With technical advances that allowed high power antennas to be built in wristwatches and other watches, the radio controlled watch has become a mass-produced item and in this way, helps many business people to keep their appointments. And the best thing is there is no longer the problem of whether to set the clock ahead or back with the change from summer to winter.
Mode of operation of a radio controlled watch
The source of all of the functionality of every radio controlled watch lies, as already mentioned, in Mainflingen at Frankfurt am Main. In the Institute, there are three different atomic clocks. Atomic clocks are based on the oscillation of atoms. Since these can be measured very accurately,
an extremely exact time measurement emerges from this. The three atomic clocks in Mainflingen work independently of each other. The time is calculated by means of an alignment of all three time measurements. The time determined is then broadcast per radio. The signal always sends the information for the next time minute. In the interior of the radio controlled watch there is an antenna that receives the signal. The radio controlled watch is set according to the data received. However, this does not happen in the same interval in which the signal is sent. A minute-by-minute comparison
with the signal would not allow a long lifetime to the operating batteries. For this reason, radio controlled watches compare their time, as a rule, once a day with the signal.
Electromagnetic pollution! Are radio controlled watches questionable?
It is a topic that always comes up. The catchwords, electromagnetic pollution, are a concern to many people - and even cause anxiety here and there. Any tool that has to do in any way with current or radio communication is denigrated. It may be dangerous to health.
It could damage the brain. Are radio controlled watches, as regards this, also questionable? No! Since a radio controlled watch only involves a receiver and not a transmitter, one can purchase a clock radio without a guilty conscience.
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