Julian, G4ILO wrote: >> >> > If you use Windows then the best program for ensuring your computer clock is > spot on is NTP for Windows which you can get from here: > http://www.meinberg.de/english/sw/ntp.htm . I have used it when I received
As this often causes confusion, it is worth pointing out that this is not something written by Meinberg, but simply the reference implementation of NTP, which Meinberg have compiled for Windows and to which they have added an installer. The reference implementation is the definitive implementation that needs to be produced before an RFC can be issued. The NTP reference implementation is open source. > NOAA satellite images and when using WSPR when you need better than one > second accuracy. This program runs as a service and after it has worked out > the drift in your computer clock it applies constant millisecond corrections Technically it applies frequency corrections - NTP uses a PLL - it was designed by an electronics engineer and ham. > so it is spot on all the time. The time synchronizer built in to Windows XP Windows is a poor platform for time and, on most other platforms the reference implementation gives even better time, although there is some evidence that another open source implementation, chrony, that uses the same over the wire formats but a different (linear regression based) mathematical approach, has better behaviour for start up and temperature change transients, in real world use. However chrony is only supported on Linux, and doesn't support local radio reference clocks. > only syncs the clock once a week which may not be enough on some PCs. The poll period is configurable, and the Windows 2003 version can be configured to almost use the proper NTP algorithm. The reference implementation is still much better, as it uses various tricks to get round the fact that Windows only reports time to applications with a 10ms resolution, by default, or 1ms with the fastest multi-media timers. I would generally ignore the non-open source alternatives as many are very crude and none are better than the reference implementation, or chrony. -- David Woolley "The Elecraft list is a forum for the discussion of topics related to Elecraft products and more general topics related ham radio" List Guidelines <http://www.elecraft.com/elecraft_list_guidelines.htm> ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
