Hi
> On Aug 13, 2018, at 7:24 AM, Dana Whitlow <k8yumdoo...@gmail.com> wrote: > > Note to all; > > Be cautious about getting time of day from consumer GPS products. All that > I have encountered > (so far) exhibit T.O.D. errors up to a few tenths of a second, and the > error is not repeatable from > session to session. Some do have PPS outputs, which are typically claimed > to provide usec > level of accuracy, but most do not. … but there *are* modules out there for not a lot of money that do indeed give quite good PPS (and TOD) information. Picking out the good brands / models from the junk is part of why you have lists like this one. > > I routinely use WWV to verify correct setting of my WWVB-synced watch and > kitchen clock. I have > occasionally seen severe setting errors, which I attribute to attempts at > syncing in the face of poor > WWVB reception conditions. > > My impression is that none of the time codes currently in use by broadcast > NIST time signals > contain forward error correction or even error detection features. If this > is wrong, please somebody > correct me! > I believe you will find that the “new” PSK modulation scheme on WWVB has at least some error detection built into it. > BTW, there are a fair number of Heathkit clocks in the wild which use WWV > (as opposed to WWVB) There aren’t a lot of those left running these days ….. Bob > for syncing. An old college-era housemate with whom I keep in touch owns > and still uses at least > one of them. > > Dana > > > On Mon, Aug 13, 2018 at 5:25 AM, Mark Spencer <m...@alignedsolutions.com> > wrote: > >> I'm trying hard to think of routine users of WWV / WWVH other than amateur >> radio operators, time nuts, and the occasional academic / scientific study >> that uses the transmitters as a signal source. >> >> Perhaps some boaters still use the time signals to set their chronometers, >> but WWV /WWVH probably wouldn't be my first choice for that application if >> I had access to GPS. >> >> Perhaps some other users of the radio Spectrum occasionally use the >> signals as a basic test signal ? >> >> I use the time signals for my amateur radio hobby when I already have an >> HF receiver and don't want to mess with using GPS as a time source. I only >> need accuracy within perhaps a third of a second so manually setting a >> computer clock while listening to WWV works for me. >> >> For my own interest I'd be curious in knowing of other routine uses of the >> WWV / WWVH time signals. >> >> >> Mark S >> VE7AFZ >> >> m...@alignedsolutions.com >> 604 762 4099 >> >>> On Aug 12, 2018, at 2:08 AM, Bob kb8tq <kb...@n1k.org> wrote: >>> >>> Hi >>> >>> One would *guess* that stopping WWVB (and killing mom and pop’s “atomic >> clocks”) would not be a reasonable thing to do. >>> It gets a lot of voters mad. I doubt that very many voters (percentage >> wise) would notice WWV and WWVH going away …. >>> >>> Bob >>> >>>> On Aug 11, 2018, at 9:00 PM, jimlux <jim...@earthlink.net> wrote: >>>> >>>> On 8/10/18 12:45 PM, Robert LaJeunesse wrote: >>>>> I'd say it does get more detailed, with the $49M in cuts described >> generally in groups here: >>>>> https://www.nist.gov/director/fy-2019-presidential-budget- >> request-summary/fundamental-measurement-quantum-science-and >>>>> One item: "-$6.3 million supporting fundamental measurement >> dissemination, including the shutdown of NIST radio stations in Colorado >> and Hawaii" >>>> >>>> I wonder if that's WWVB, or WWV & WWVH >>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@lists.febo.com >>>> To unsubscribe, go to http://lists.febo.com/mailman/ >> listinfo/time-nuts_lists.febo.com >>>> and follow the instructions there. >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@lists.febo.com >>> To unsubscribe, go to http://lists.febo.com/mailman/ >> listinfo/time-nuts_lists.febo.com >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe, go to http://lists.febo.com/mailman/ >> listinfo/time-nuts_lists.febo.com >> and follow the instructions there. >> > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.