[time-nuts] WWVB Signal Generator

[paul swed]

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 <k8yumdoober at 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.holder at 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 <organlists at 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
> > >
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