jack wrote: > Hi all, > > I am trying to sync my Windows box to an external GPS source. I > currently have BU353, whose output is not very periodic. I read up on > ntpd implementation that uses PPS signal but I don't even have an RS > 232 port on my computer. > > My questions: > 1) what's the best GPS antenna (and protocol) in terms of > consistencies in its output? > 2) what kind of accuracy can i expect? > > Thanks to all. > > Jack
Jack, I recently wanted to add a serial feed to a PC but, like your PC, there was no serial port. In my case, I could choose a different PC, but I could have bought a PCI serial card (which seem to be quite rare, now). I don't know if anyone has written a driver which will suit your USB-based BU353. As to accuracy, I've been helping Dave Hart test a new NTP port for Windows, and on my PC I'm seeing reported offsets typically less than 300 microseconds from a serial and PPS GPS device (Garmin GPS18 LVC), and there is strong evidence that the variations are temperature related, as the PC is in a domestic environment, and the reported offset correlates well with the ambient temperature. http://www.satsignal.eu/mrtg/feenix_ntp_2.html That type of device will give better accuracy than a USB-connected GPS, and it needs no external antenna. Cheers, David _______________________________________________ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
