Hi The gotcha is if you have neighbors two or three doors away that *also* put up one of these devices. You then have a real problem with the neighbor(s) in the middle. The wavelength is long enough that Raleigh issues won’t get you. You still have the two signals ( at slightly different frequencies) beating against each other. The result is going to show up as who knows what to this or that receiver. With a precision receiver, you might even have issues from the guy two houses away …...
Bob > On Aug 26, 2018, at 1:08 PM, paul swed <paulsw...@gmail.com> wrote: > > Agree with the conversation. With respect to neighbors when the day comes > they may ask you to boost your signal. :-) > Granted maybe the day won't come but at least having your local clocks work > is nice. > Regards > Paul > WB8TSL > > On Sat, Aug 25, 2018 at 10:29 PM, Dana Whitlow <k8yumdoo...@gmail.com> > wrote: > >> With the watch being physically close to the faux WWVB "transmitter", one >> is in >> the so-called "near field" regime, where the field strength (V/m) falls as >> the inverse >> cube of the distance. If one is putting the watch, say, within a few >> inches of the >> transmitter, reliable reception should be available yet the signal should >> be literally >> undetectable by any practical receiving device more than a few feet away. >> Hence, >> meeting the FCC field strength limit should be trivial.if the device is >> used as pictured. >> However, if one cranks up the power enough to reliably cover one's entire >> house, >> then there might be a problem depending how close the nearest neighbor >> lives, >> even at levels well within the FCC limit he quotes. >> >> Taking the near field relationship in hand, 40 uV/m at 300m would translate >> into >> a whopping 0.135 V/m at 20 meters range, more than enough to feed most >> peoples' >> entire house. So the pragmatic issue would again be- neighbors. On the >> other >> hand, most of them would never be aware of the local signal as long as they >> get good >> time settings, unless they live close enough to Ft. Collins for the two >> signals to >> contend with each other. >> >> It looks to me like the ferrite rod antenna is considerable overkill. Even >> with no >> purposeful antenna I'd expect leakage to yield sufficient signal for at >> least a few >> inches. >> >> Dana >> >> >> On Sat, Aug 25, 2018 at 8:11 PM Wayne Holder <wayne.hol...@gmail.com> >> wrote: >> >>> This guy has what looks like a well thought out design using a Sirf-Based >>> GPS and ATTiny44A chip to generate a signal to update his watch: >>> >>> https://www.anishathalye.com/2016/12/26/micro-wwvb/ >>> >>> Unfortunately, he doesn't seem to have published a schematic or his >> source >>> code. But, he covers enough detail that I think it wouldn't be too hard >> to >>> replicate what he's done. Or, perhaps he would disclose these details if >>> contacted. >>> >>> Wayne >>> >>> On Sat, Aug 25, 2018 at 4:33 AM, D. Resor <organli...@pacbell.net> >> wrote: >>> >>>> I thought I would search in a different way for a WWVB signal generator >>>> design. I found this item. While the designer explains it isn't as >>>> accurate as WWVB it may be another starting point. >>>> >>>> http://www.tauntek.com/wwvbgen-low-cost-wwvb-time-signal-generator.htm >>>> >>>> >>>> >>>> Donald R. Resor Jr. T. W. & T. C. Svc. Co. >>>> http://hammondorganservice.com >>>> Hammond USA warranty service >>>> "Most people don't have a sense of humor. They think they do, but they >>>> don't." --Jonathan Winters >>>> >>>> _______________________________________________ >>>> 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.