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 your