There are many commercially available radio and GPS clock timing references for PC’s. Radio and GPS clocks obtain accurate time from national radio timing references or from the GPS system. The devices have serial or USB interfaces and provide an accurate timing reference to PC’s. Driver software periodically synchronises the system time of the host computer to the received reference time. Often reference clock drivers are available that interface to the NTP application software to provide your own dedicated NTP server.
Radio example receivers often have the asset of having the quality to kite a vantage signal, indoors, end to the hostess computer. However, the start can only be conventional locally to the transmitter. There are a numerousness of raise example broadcasts available: MSF heritable from Rugby, UK; DCF-77 sent from Frankfurt, Germany; WWVB inheritable from Colorado, USA; CHU, Canada and TDF, France. GPS has the favor of providing a round case and ratio solution; however, an externally settled sender is obligatory which can be impractical.
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