Casio Wave Ceptor

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A Casio Wave Ceptor. The model number (not visible) indicates that it can receive the signals from WWVB in Fort Collins and the JJY signals in Japan.

Casio Wave Ceptor is a line of radio watches by Casio. Wave Ceptor watches set themselves to the correct time by receiving time signals from various government time services around the world. These signals transmit the time measured by atomic clocks accurate to one second in millions of years; by synchronizing daily with the signals, the Wave Ceptor watches achieve high accuracy, running with quartz timekeeping accuracy between synchronizations.

Radio-controlled watches require no setting of time, date, or daylight saving time; and like most other watches of this kind, they attempt automatic synchronization at least once every 24 hours, usually in the middle of the night. Free-running Wave Ceptors, like other commercial quartz timepieces, are typically accurate to better than 15 seconds per month; daily synchronization ensures 500 ms per day accuracy.

As with all radio-controlled watches they revert to free-running quartz watch operation in areas out of range or shielded from time signals, which gives them the accuracy of a standard quartz watch.

The number of receivers which the watches can tune to vary by each watch submodel, almost all current watches can now tune to several signals around the world. In Europe the reception range is approximately 1,500 kilometres. If for any reason the watch is unable to tune in, for example when travelling far too away in a different region without a signal, they function as quartz watches.


There are currently six radio towers around the world:


Watches can tune in to two locations:

The 40kHz signal from JJY at Mount Otakadoya, near Fukushima (Ohtakadoyayama).

The 60kHz signal from the Haganeyama Transmitter at Mount Hagane (Haganeyama).


Watches tune to the 68kHz signal from BPC at Shangqiu. This is the newest additional signal; older multi-band 5 watches will not be able to connect to this signal. You will need to upgrade to a newer multi-band 6 watch for it to work.

United States

Watches tune to the 60kHz signal from WWVB at Fort Collins.

United Kingdom

Watches tune to the 60kHz MSF at Anthorn.


Watches tune to the 77.5kHz low frequency time signal radio station DCF77 at Mainflingen.

Multi Band 6[edit]

If a radio watch can tune to all six signals[1] then it is known as a multi-band 6 watch.[2] Current multi-band 6 watches by Casio include the popular G-Shock line of watches.

Radio Tower Locations Around The World
A Casio G-Shock watch with Multi Band 6 on the left and an older Multi Band 5 model on the right.


In additional to Casio, Japanese manufacturers Seiko and Citizen Watch also makes radio-controlled watches.

The German manufacturer Junghans makes radio-controlled watches too.

See also[edit]


  1. ^ "what is multiband function?". Retrieved 2017-12-17. 
  2. ^ "Multi Band 6 - Watch Technologies | CASIO". Watch Technologies | CASIO. Retrieved 2017-12-17. 

External links[edit]