[time-nuts] WWVB Dephaser Question

[paul swed]

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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> >
> >
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