Casio Wave Ceptor
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 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.
Multi Band 6
The German manufacturer Junghans makes radio-controlled watches too.