[time-nuts] WWV receivers?
nsayer at kfu.com
Sat Oct 29 15:25:38 EDT 2016
No, no, no.
The single chip in this case is an AFSK decoder. You still have to have an ordinary HF AM radio.
> On Oct 29, 2016, at 11:21 AM, Chris Albertson <albertson.chris at gmail.com> wrote:
> Are you sure the single chip receiver is not itself an SDR? Maybe using a little 8-bit uP inside? I don't know.
> In any case the jitter on the SDR depends on the sample rate clock. If you use a decent audio interface the clocks are not bad. A little 4-pin crystal oscillator controls the sampling. Compared to the propagation delay the quality of that crystal is a not a big deal.
> On Fri, Oct 28, 2016 at 10:36 PM, Nick Sayer via time-nuts <time-nuts at febo.com <mailto:time-nuts at febo.com>> wrote:
> That single-chip version is going to have a *LOT* less (and less variable) latency than an SDR.
> > On Oct 27, 2016, at 12:20 AM, Poul-Henning Kamp <phk at phk.freebsd.dk <mailto:phk at phk.freebsd.dk>> wrote:
> > --------
> > In message <5A002554-8D90-4C75-95DA-21DB45D61E95 at kfu.com <mailto:5A002554-8D90-4C75-95DA-21DB45D61E95 at kfu.com>>, Nick Sayer via time-
> > nuts writes:
> >> If you’re in North America, a CHU receiver is a lot easier to make
> >> than WWV/WWVH. The CHU timecode is just BEL 103 AFSK at 300 baud -
> >> it was a one-chip solution 20 years ago when I made one in college.
> > We have CPUs and sounds-cards these days...
> > Also: The KiwiSDR is nearly perfect hardware, no matter which VLF/HF
> > station you want: You can track GPS and four (possibly 8) VLF/HF
> > stations at the same time.
> > --
> > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
> > phk at FreeBSD.ORG | TCP/IP since RFC 956
> > FreeBSD committer | BSD since 4.3-tahoe
> > Never attribute to malice what can adequately be explained by incompetence.
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> Chris Albertson
> Redondo Beach, California
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