[time-nuts] WWVB Dephaser Question

[John C. Westmoreland, P.E.]

Paul,

Sure - even on my OpenHPSDR system using my vertical antenna - I am almost
able to decode WWVB (reliably) using the clock
program from:

http://f6cte.free.fr/index_anglais.htm

with no changes whatsoever.  If I 'fix' the antenna - I'm sure it'll work
more reliably.

Teensy is Arduino compatible - pretty sure you can use the tools/libs
fairly easily from Arduino - I don't have a Teensy (yet) but I will
probably
get a kit like what's outlined in Chris's post and also here for the people
that may not be in the US:

https://github.com/DD4WH/Teensy-DCF77 (referenced by Chris in his post).

that describes the antenna circuit in more detail.

73's,
John
AJ6BC







On Mon, Oct 12, 2020 at 8:20 PM paul swed <paulswedb at gmail.com> wrote:

> John
> I would simply use any number of receivers and grab 60 KHz out of one or
> could use the IF at 10 KHz or 1 KHz. But more fun to use 60 KHz. The cost
> on the teensy components is very reasonable.
> Regards
> Paul
>
> On Mon, Oct 12, 2020 at 7:44 PM John C. Westmoreland, P.E. <
> john at westmorelandengineering.com> wrote:
>
> > Hello Time Nuts,
> >
> > Chris - maybe you can share that if that's something you can share right
> > now.
> >
> > Jim and Paul,
> >
> > Like Chris pointed out - on that audio board in the design he's worked
> on -
> > the Line In has L and R channels - the input resistance is higher than
> for
> > the mic input -
> > but I suppose it's possible to try a BPSK implementation using that as a
> > starting point.  There's no separate gain stage for the Line In inputs
> like
> > for the mic - but
> > it could work - a small preamp that works with the input impedance of the
> > Line In circuitry may be necessary to get a good input signal - but that
> > shouldn't be too hard
> > to add.  Also - do the internals of that chip - the
> >
> > https://www.pjrc.com/teensy/SGTL5000.pdf
> >
> > really allow the L/R Line In channels to be treated independently?  If
> so,
> > it should be good to go at least for experimentation.
> >
> > 73's,
> > John
> > AJ6BC
> >
> >
> >
> >
> > On Mon, Oct 12, 2020 at 12:07 PM Chris Howard <chris at elfpen.com> wrote:
> >
> > >
> > > I received a good pointer about doing the BPSK implementation
> > > but have just not gotten it done.
> > >
> > > Chris Howard
> > >
> > >
> > >
> > > On 10/12/20 11:02 AM, jimlux wrote:
> > > > On 10/12/20 7:40 AM, paul swed wrote:
> > > >> John really appreciate the pointer. Though it doesn't help wwvb BPSK
> > > >> its a
> > > >> really good intro to SDR and DSP super simple. A good way to get
> your
> > > >> feet
> > > >> wet. Hmmm is there a parts order soon? :-)
> > > >> Regards
> > > >> Paul
> > > >> WB8TSL
> > > >
> > > >
> > > > And the teensy has plenty of space and speed to implement a PLL for
> > > > doing BPSK demodulation.
> > > >
> > > >
> > > >>
> > > >> On Mon, Oct 12, 2020 at 10:33 AM Bob kb8tq <kb8tq at n1k.org> wrote:
> > > >>
> > > >>> Hi
> > > >>>
> > > >>> The “ideal” antenna solenoid would be a bit longer ( say 2 X to 5X
> ).
> > > >>> The turns should be spaced apart by a few percent of the length.
> > > >>> ( so turns over 30 or so … not so much …).
> > > >>>
> > > >>> How much better is “ideal” compared to “just get it done?”. At
> least
> > > >>> from the stories that are told, it is significant. Since all these
> > > >>> antennas
> > > >>> are very small (so non-ideal) it’s a bit of a snail race.
> > > >>>
> > > >>> Bob
> > > >>>
> > > >>>> On Oct 12, 2020, at 3:42 AM, John C. Westmoreland, P.E. <
> > > >>> john at westmorelandengineering.com> wrote:
> > > >>>>
> > > >>>> Paul,
> > > >>>>
> > > >>>> Doesn't the post by Chris Howard above appear to be a good/great
> > > >>>> starting
> > > >>>> point?
> > > >>>> Seems like that approach could be extended.
> > > >>>>
> > > >>>> https://github.com/chris-elfpen/Teensy4WWVBsdr
> > > >>>>
> > > >>>> 73's,
> > > >>>> John
> > > >>>> AJ6BC
> > > >>>>
> > > >>>>
> > > >
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