Software Costas, see MatLab: https://www.mathworks.com/matlabcentral/fileexchange/16744-demodulating-a-bp sk-using-costas-loop?s_tid=FX_rc2_behav
Lester B Veenstra K1YCM MØYCM W8YCM 6Y6Y les...@veenstras.com 452 Stable Ln (HC84 RFD USPS Mail) Keyser WV 26726 GPS: 39.336826 N 78.982287 W (Google) GPS: 39.33682 N 78.9823741 W (GPSDO) Telephones: Home: +1-304-289-6057 US cell +1-304-790-9192 Jamaica cell: +1-876-456-8898 -----Original Message----- From: time-nuts [mailto:time-nuts-boun...@lists.febo.com] On Behalf Of paul swed Sent: Wednesday, July 22, 2020 1:26 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] WWVB PM Time Questions The KD2BD receiver is a costas loop. So look at that and you have the answer. It does not decode the BPSK data though. Thats quite a project all by itself. Regards Paul On Wed, Jul 22, 2020 at 10:42 AM Rodger via time-nuts < time-nuts@lists.febo.com> wrote: > Hey Ray, > > Paul and I have a nice piece of code that generates the WWVB BPSK bit > stream > using an Arduino and a ublox GPS module. (total cost under $30) You could > use this as a WWVB emulator while you're working on your code. Sorry, I > can't really help with your question about demodulating the WWVB BPSK but > the Costas loop sounds like the way to go. It has also been suggested that > a WWVB SDR wouldn't be too difficult to build and would open up lots of > possibilities. Unfortunately, I don't have a clue where to begin with > that. > Maybe somebody with some SDR experience can chime in. > > Re your comment about $30 BPSK clocks. The only clock I'm aware of that > uses the BPSK is the Lacrosse Ultratomic. Are you aware of any others? > > Thanks, > > Rodger > > -----Original Message----- > From: time-nuts <time-nuts-boun...@lists.febo.com> On Behalf Of > rcb...@atcelectronics.com > Sent: Tuesday, July 21, 2020 11:52 PM > To: Discussion of precise time and frequency measurement > <time-nuts@lists.febo.com> > Subject: Re: [time-nuts] WWVB PM Time Questions > > Paul, thanks for the suggestions. The top of the minute is a good idea. > Since the first second is part of the sync pattern it will always be 0 and > the phase would be 0. A differential opamp with one input from WWVB and the > other from the local source fed to the STM32 would tell if the signals were > in phase. A single gate inverter controlled by the STM32 could be used to > invert the local source if necessary. > > I have worked with the Bluepill for the last year on a few small projects. > The most complex one (which isn't really complex) was to control two > stepper > motors. I really like the boards and you can't beat the prices. I don't use > the bootloader so I have no experience with it. > > Dana, I looked at the Costas loop and had sort of ruled it out. I may take > another look at it as I get further into the project. I will probably use a > 15.360 MHz oscillator and divide by 256 to get the 60 kHz local source. > Once > I get the front end working I will be able to start some "real" testing. > > Suggestions from others are welcome. > > Ray, > AB7HE > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.