Multi-band 5 (USA) or Multi-band 6 (Japan) – perhaps the most significant aspect of the Oceanus line is the ability of all watches to automatically synchronize with the Japanese time signal (JJY), the American time signal (WWVB) from Colorado, and the European time signals from both England (Time from NPL) and Germany (DCF77).
CASIO mentions that in Europe, the watches will tune to the low frequency time signal radio station DCF77 located at Mainflingen in Germany or MSF at Anthorn (formerly transmitting from Rugby, Warwickshire) in the United Kingdom.
The German time signal DCF77, in addition to amplitude keying, employs phase-shift keying driven by a 9-stage LFSR to increase the accuracy of received time and the robustness of the data stream in the presence of noise.
Joining the pool requires at least a broadband connection to the Internet, a static IP address, and accurate time from another source (for example from another NTP server, from a DCF77 receiver, WWVB receiver or a GPS receiver).
The most popular means is the transmission of standard frequency and time signals by the longwave time signal DCF77.
This station is the only broadcast of official time in Spain because there is not any longwave station broadcasting time signals like DCF77 from Germany or MSF60 (also known as NPL) from United Kingdom.
The Stoppomat is equipped with electronics with printing function, a stopwatch with a DCF77 radio receiver and an independent power supply for a buffer period of one week.
Examples of a one-way time transfer system are the clock on a church or town building and the ringing of their time-indication bells; time balls, radio clock signals such as LORAN, DCF77 and MSF; and finally the Global Positioning System which uses multiple one-way time transfers from different satellites, with positional information and other advanced means of delay compensations to allow receiver compensation of time and position information in real time.
DCF77 |