Besides synchronizing to other NTP servers via a local area or wide area network, the NTP4 plug-in also
allows you to synchronize your computer to a number of hardware clocks, including GPS satellite
receivers and radio clocks. A number of physics laboratories in various countries operate low frequency radio transmitters with
ranges spanning continents.
WWV / WWVB, National Institute
of Standards and Technology, Ft. Collins, Colorado, USA. The signal transmitted from Ft. Collins can be received throughout most of
the continental United States as well as throughout most of Canada.
DCF77, National Institute of Natural and
Engineering Sciences, Germany. The DCF77 signal can be received throughout most of western Europe, the British Isles, and is reported
to be received at night as far as India, Israel and Yemen.
JJY, Communication Research Laboratory
(CRL), Japan. CRL broadcasts Japan Standard Time
via long wave radio.
Support for drivers in this section is contained in the NTP4 plug-in which accompanies PresenTense Time
Server. The PresenTense NTP4 plug-in contains drivers for these and more. A comprehensive list of drivers
supported by the NTP4 plug-in is shown in the table below. In order to enable support for the clocks shown in this section, you need
to select the GPS tab. This will display the [Reference Clock] view where you can select the correct driver for