Hi The tick is a burst of audio at a fairly low frequency. You are going to need pretty good conditions to get 0.1 ms. The fade process over much of the day will spread that out a *lot*.
Bob > On Feb 24, 2016, at 5:11 PM, Tim Shoppa <[email protected]> wrote: > > Hal - > In my experience over more than a decade, the ntpd WWV audio refclock has > jitter circa 0.1ms. > > This is not nanosecond-time-nut PPS territory. But it is more than good > enough for WAN ntpd. > > I use a Ten-Tec RX-320 as a cheap frequency-agile receiver for WWV. In > between 5MHz/10MHz/15MHz usually one or two bands are open from me to > Colorado. > > On the subject of WWVB - if you are near Colorado then you can have 24x7 > reachability, day or night. For me on the east coast, WWVB 60kHz is > reliable in darkness but not in daylight. > > Tim. > > On Wed, Feb 24, 2016 at 1:56 PM, Hal Murray <[email protected]> wrote: > >> >> [email protected] said: >>> My opinion if you want to serve reliable time through a longer GPS >> outage: >>> add a WWV or WWVB based radio clock. e.g. a shortwave radio and https:// >>> www.eecis.udel.edu/~mills/ntp/html/drivers/driver36.html >> >> Do you have any graphs comparing WWV or WWVB to GPS when your GPS is >> working >> correctly? >> >> When I run out of other things on my list, I'd like to collect that data. >> What receivers do people recommend? >> >> I have one of the low cost WWVB receiver modules but I never got any useful >> data out of it. Maybe it's time to try again. It might work better on the >> end of a long cable to get it away from all the EMI in my office. >> >> >> -- >> These are my opinions. I hate spam. >> >> >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
