[time-nuts] WWVB Simulator
albertson.chris at gmail.com
Tue Jan 3 02:16:38 EST 2017
This could be done with a LOT fewer chips. Two ways to go
1) All you need is a phase inverter controlled by a one bit signal
and an attenuator also controlled by a one bit signal and a small
micro controller. the small uP provides the two control signals. It
maybe gets time from a 1PPs
2) A faster computer could do direct synthesis of the 60KHz waveform
You write 180K samples to a DAC per second One of the $10 ARM
SBCs will work. You would need to apply a good 60KHz low pass filter
On Mon, Jan 2, 2017 at 1:18 PM, M. Simon via time-nuts
<time-nuts at febo.com> 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.
> Engineering is the art of making what you want from what you can get at a profit.
> I like Polywell Fusion.
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Redondo Beach, California
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