[time-nuts] WWVB Simulator

Scott Stobbe scott.j.stobbe at gmail.com
Mon Jan 2 20:48:07 EST 2017


Fwiw, an xor gate would make a simple bpsk modulator, carrier input A
modulation B, B is low A is buffered, when B is high, carrier is inverted
(180 degree phase shift).

On Mon, Jan 2, 2017 at 7:20 PM David <davidwhess at gmail.com> wrote:

> I see generally how it should work but did not draw out a truth table.
>
>
>
> Why use the 74CB3T3253 instead of a low voltage 4052 variant?
>
>
>
> It think you could buffer just the two references and save two
>
> operational amplifiers and 2 or 4 capacitors.
>
>
>
> On Mon, 2 Jan 2017 21:18:12 +0000 (UTC), you wrote:
>
>
>
> >I have come up with a ridiculously simple WWVB simulator that simulates
> both the AM modulation and the BPSK modulation.
>
> >
>
> >A simple explanation and a link to the core schematic can be found here:
> http://spacetimepro.blogspot.com/2017/01/wwvb-simulator.html
>
> >I'm working on fleshing out the design and producing a PCB. Any comments
> or suggestions before I complete the design are welcome. I will try to
> incorporate useful suggestions in the final design.
>
> >
>
> >Note: I have looked all over the 'net for a similar design or any thing
> hinting at it. I found nothing. Once you see the design it becomes obvious.
>
> >
>
> >What clarified it for me is that I looked at the last diagram in this
> file http://www.wparc.us/presentations/SDR-2-19-2013/Tayloe_mixer_x3a.pdf
> and then plotted out the digital version of what the one cycle of the
> carrier would look like given that the signal is just made up of ones and
> zeros.
>
> >The final design (as far as I have gone) incorporates a synchronizing
> latch so the signals only change at the "zero" of the modulator.
>
> >
>
> >Simon
>
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