[time-nuts] new WWVB BPSK dev board

[Adrian Godwin]

I understand why a low-volume shipment of what started as a board costing a
few pennies costs $50, but does that simply mean that low-cost parts aren't
the right answer for this sort of application ?

How would an SDR based on a raspberry pi zero, a suitable ADC and a tuned
rx circuit compare ?



On Tue, Dec 4, 2018 at 4:54 PM David G. McGaw <David.G.McGaw at dartmouth.edu>
wrote:

> It does a very good job of pulling the signal out of the noise.  It
> works in NH, traditionally a fringe region, in all but the most shielded
> of rooms.  I also had occasion to test it for Everset in Kangerlussuaq,
> Greenland.  I found it had no trouble acquiring at any time of the day.
> If the ES100 does not do well enough for you, there is supposedly an
> ES200 available that uses a longer sequence for even more sensitivity.
>
> The one thing I wish is that there were access to the synchronized
> analog signal and/or a 1PPS.  Even a top of the minute would be useful.
> It only has the I2C digital interface.
>
> 73,
>
> David N1HAC
>
>
> On 12/4/18 11:35 AM, Tim Shoppa wrote:
> > Thanks for the heads up Tom! I ordered one and if it comes before the end
> > of the year I may have some time over the holidays to do acquisition test
> > from Maryland and maybe some cross-comparison with GPS PPS.
> >
> > Here in Maryland I have somewhat unreliable reception on commercial
> > non-BPSK WWVB clocks at my house. My Casio Waveceptor watch is 99%+
> > reliable when I'm asleep on the 2nd floor but much less likely to work in
> > the basement. I can reliably hear the amplitude-keyed WWVB carrier on a
> LF
> > receiver with a homebrew loop (about 3 foot by 3 foot) in the evenings
> but
> > it takes some imagination to think I can hear it during the daytime.
> >
> > Tim N3QE
> >
> > On Mon, Dec 3, 2018 at 9:12 PM Tom Van Baak <tvb at leapsecond.com> wrote:
> >
> >> At long last, a complete WWVB 60 kHz BPSK dev board is available:
> >>
> >>
> >>
> https://universal-solder.ca/product/everset-es100-cob-wwvb-60khz-bpsk-receiver-kit-with-2-antennas/
> >>
> >> Note it includes the antenna(s). Also has links to documentation.
> >>
> >> It would be very nice if a bunch of time nuts around the country played
> >> with these and reported results.
> >>
> >> Prior to this, the only device that you could buy which used the
> enhanced
> >> WWVB format was the La Crosse 404-1235UA-SS UltrAtomic clock. It was not
> >> developer friendly, so a dev board with the Everset ES100 chip is good
> news.
> >>
> >> The maker / hacker / Arduino crowd may enjoy a fresh source of accurate
> >> time; something independent of GPS or NTP. Some technical postings about
> >> reception quality, acquisition speed, and timing precision would be most
> >> welcome.
> >>
> >> /tvb
> >>
> >>
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