[ntp:questions] Why does the "Conrad parallel port radio clock" driver has a standard offset of 0.1725s?
Hi, While going through the documentation we found that the "Conrad parallel port radio clock" driver has a default offset calibration factor of 0.1725s. Why is that specific factor chosen? This is especially interesting as my GPS has an offset of -0.173s! Is that a coincidence? Folkert van Heusden -- Looking for a cheap but fast webhoster with an excellent helpdesk? http://keetweej.vanheusden.com/redir.php?id=1001 -- Phone: +31-6-41278122, PGP-key: 1F28D8AE, www.vanheusden.com ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
Re: [ntp:questions] Why does the "Conrad parallel port radio clock" driver has a standard offset of 0.1725s?
Hi, Folkert van Heusden wrote: > While going through the documentation we found that the "Conrad parallel > port radio clock" driver has a default offset calibration factor of > 0.1725s. > Why is that specific factor chosen? I bet this has been determined by a measurement. The DCF77 amplitude is lowered at the beginning of a new second. Most cheap receivers detect the second change when the amplitude has dropped below a certain limit. The delay of this depends strongly on the bandwith of the transmitting and reeiving antenna and circuit. > This is especially interesting as my GPS has an offset of -0.173s! Is > that a coincidence? I'm sure it does. You might try to "fudge time1" for that particular device, if the driver supports that. Martin -- Martin Burnicki Meinberg Funkuhren Bad Pyrmont Germany ___ questions mailing list questions@lists.ntp.org https://lists.ntp.org/mailman/listinfo/questions
