[time-nuts] WWVB Simulator

David davidwhess at gmail.com
Mon Jan 2 19:20:40 EST 2017

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. 

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