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 <[email protected]> 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 > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
