Hello Time Nuts and Paul, Glad to hear you're making progress - of course, as Chris Howard mentioned earlier - it's all based on this as a starting point:
https://github.com/DD4WH/Teensy-DCF77 and Chris' work is here: https://github.com/chris-elfpen/Teensy4WWVBsdr Those sites are good to look at and review as well. I still think some work will be needed to get a good signal in on the Line In channel. 73's, John AJ6BC On Fri, Oct 23, 2020 at 6:45 PM paul swed <[email protected]> wrote: > John I was looking for a lot of things around BPSK and SDR and more. > Had not hit this repository yet. But it has the piles of functions that > would be useful. I noted it had a I & Q oscillator. So maybe the way this > all works is you grab these functions and line them up. In looking at the > wwvb SDR for AM mentioned here by Chris thats what I had started to > understand. > Really slowly getting the barest grasp on what a project might look like. > With respect to the wwvb AM SDR receiver it does not look like any of the > code would be used for solving the BPSK problem. That is not throwing > stones by the way. It did nicely prove that a signal could come in and be > processed through numbers of steps. It does work. > My next step is to keep learning and then start to tinker with some of the > modules in this library or even simpler the audio library for the pjrc > shield. Audio in digitise and then back out. Much like the super simple > arduino blinky program you have to start someplace. > Regards > Paul > WB8TSL > > On Fri, Oct 23, 2020 at 7:55 PM John C. Westmoreland, P.E. < > [email protected]> wrote: > > > Hello Time Nuts, > > > > The code that has been previously discussed in this thread is posted > here, > > in case some of you didn't know and could be wondering about it: > > > > https://github.com/chipaudette/OpenAudio_ArduinoLibrary > > > > It's for the Teensy boards and WWV(B/H) SDR. > > > > 73's, > > John > > AJ6BC > > > > On Sun, Oct 18, 2020 at 12:27 AM John C. Westmoreland, P.E. < > > [email protected]> wrote: > > > > > Hello Time Nuts, > > > > > > FYI: Teensy NTP server found here: > > > https://github.com/ddrown/teensy-ntp > > > > > > 73's, > > > John > > > AJ6BC > > > > > > > > > On Sat, Oct 17, 2020 at 1:16 PM paul swed <[email protected]> wrote: > > > > > >> The teensy arrived and was easily installed in the arduino IDE. Worked > > >> right off the bat. > > >> The wiring of the A/D and the TFT display is a bit less clear. I have > > all > > >> of the details but need to go over them carefully. The teensy 4.0 is > > >> slightly different in the pins used as compared to the various > > >> documentation on the wwvb receiver. I will guess this is going to have > > an > > >> effect in the actual program. > > >> Regards > > >> Paul > > >> WB8TSL > > >> > > >> On Sat, Oct 17, 2020 at 12:06 PM John C. Westmoreland, P.E. < > > >> [email protected]> wrote: > > >> > > >> > Hello Time Nuts, > > >> > > > >> > Maybe this should be added to this thread - this page is actually > > pretty > > >> > good: > > >> > > > >> > https://en.wikipedia.org/wiki/WWVB > > >> > > > >> > 73's, > > >> > John > > >> > AJ6BC > > >> > > > >> > > > >> > On Tue, Oct 13, 2020 at 12:50 PM John C. Westmoreland, P.E. < > > >> > [email protected]> wrote: > > >> > > > >> > > Hello Time Nuts, > > >> > > > > >> > > Paul, I haven't gone over in fine detail of how the multipsk > > software > > >> is > > >> > > working - so I'd like to answer with that caveat if that's OK. > > >> > > > > >> > > I thought it was more interesting that I got anything working as > far > > >> as > > >> > > 60kHz with my existing OpenHPSDR rig AND my default antenna. > > >> > > The system wasn't really designed for that - and it worked. > > >> > > > > >> > > I'll dig into some of the details and report back - since the time > > >> > > information is all that is needed for clock synchronization - I > > think > > >> the > > >> > > easiest method available is more than likely what was done. > > >> > > > > >> > > It agrees with the GPS feed from Themis - so, that's a good check. > > >> Also, > > >> > > Themis is driving the reference clock for the HPSDR rig. > > >> > > > > >> > > 73's, > > >> > > John > > >> > > AJ6BC > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > >> > > On Tue, Oct 13, 2020 at 12:20 PM paul swed <[email protected]> > > >> wrote: > > >> > > > > >> > >> John I looked at what you sent. I assume its decoding the am time > > >> signal > > >> > >> is > > >> > >> that correct? > > >> > >> > > >> > >> On Tue, Oct 13, 2020 at 1:19 PM Chris Howard <[email protected]> > > >> wrote: > > >> > >> > > >> > >> > > > >> > >> > That's a fair assessment. I'm really not very far into SDR > > >> > programming, > > >> > >> > would like to learn more. > > >> > >> > > > >> > >> > I was working with someone who gave me a way forward toward > > >> > >> > using the same hardware to do the BPSK demodulation, but I want > > >> > >> > to get his OK before I spread his stuff into this group or > other > > >> > places. > > >> > >> > And I have not yet done anything with it yet myself. > > >> > >> > > > >> > >> > > > >> > >> > Chris > > >> > >> > > > >> > >> > > > >> > >> > On 10/13/20 9:06 AM, paul swed wrote: > > >> > >> > > The teensy is on order and downloaded the arduino plugin. > > >> > >> > > In looking at the code I should mention it does not appear to > > be > > >> a > > >> > I&Q > > >> > >> > > sampling. Just a single stream I AM sampler. Though at 60 > Khz. > > >> Its > > >> > >> > > essentially a diode with AGC and a slicer to determine a 1 or > > 0. > > >> No > > >> > >> > matter > > >> > >> > > a good start in the world of SDR. (At least I do not see an > I&Q > > >> > >> approach) > > >> > >> > > Regards > > >> > >> > > Paul > > >> > >> > > > > >> > >> > > On Tue, Oct 13, 2020 at 2:47 AM John C. Westmoreland, P.E. < > > >> > >> > > [email protected]> wrote: > > >> > >> > > > > >> > >> > >> Paul, > > >> > >> > >> > > >> > >> > >> Sure - even on my OpenHPSDR system using my vertical > antenna - > > >> I am > > >> > >> > almost > > >> > >> > >> able to decode WWVB (reliably) using the clock > > >> > >> > >> program from: > > >> > >> > >> > > >> > >> > >> http://f6cte.free.fr/index_anglais.htm > > >> > >> > >> > > >> > >> > >> with no changes whatsoever. If I 'fix' the antenna - I'm > sure > > >> > it'll > > >> > >> > work > > >> > >> > >> more reliably. > > >> > >> > >> > > >> > >> > >> Teensy is Arduino compatible - pretty sure you can use the > > >> > tools/libs > > >> > >> > >> fairly easily from Arduino - I don't have a Teensy (yet) > but I > > >> will > > >> > >> > >> probably > > >> > >> > >> get a kit like what's outlined in Chris's post and also here > > for > > >> > the > > >> > >> > people > > >> > >> > >> that may not be in the US: > > >> > >> > >> > > >> > >> > >> https://github.com/DD4WH/Teensy-DCF77 (referenced by Chris > in > > >> his > > >> > >> > post). > > >> > >> > >> > > >> > >> > >> that describes the antenna circuit in more detail. > > >> > >> > >> > > >> > >> > >> 73's, > > >> > >> > >> John > > >> > >> > >> AJ6BC > > >> > >> > >> > > >> > >> > >> > > >> > >> > >> > > >> > >> > >> > > >> > >> > >> > > >> > >> > >> > > >> > >> > >> > > >> > >> > >> On Mon, Oct 12, 2020 at 8:20 PM paul swed < > > [email protected]> > > >> > >> wrote: > > >> > >> > >> > > >> > >> > >>> John > > >> > >> > >>> I would simply use any number of receivers and grab 60 KHz > > out > > >> of > > >> > >> one > > >> > >> > or > > >> > >> > >>> could use the IF at 10 KHz or 1 KHz. But more fun to use 60 > > >> KHz. > > >> > The > > >> > >> > cost > > >> > >> > >>> on the teensy components is very reasonable. > > >> > >> > >>> Regards > > >> > >> > >>> Paul > > >> > >> > >>> > > >> > >> > >>> On Mon, Oct 12, 2020 at 7:44 PM John C. Westmoreland, P.E. > < > > >> > >> > >>> [email protected]> wrote: > > >> > >> > >>> > > >> > >> > >>>> Hello Time Nuts, > > >> > >> > >>>> > > >> > >> > >>>> Chris - maybe you can share that if that's something you > can > > >> > share > > >> > >> > >> right > > >> > >> > >>>> now. > > >> > >> > >>>> > > >> > >> > >>>> Jim and Paul, > > >> > >> > >>>> > > >> > >> > >>>> Like Chris pointed out - on that audio board in the design > > >> he's > > >> > >> worked > > >> > >> > >>> on - > > >> > >> > >>>> the Line In has L and R channels - the input resistance is > > >> higher > > >> > >> than > > >> > >> > >>> for > > >> > >> > >>>> the mic input - > > >> > >> > >>>> but I suppose it's possible to try a BPSK implementation > > using > > >> > >> that as > > >> > >> > >> a > > >> > >> > >>>> starting point. There's no separate gain stage for the > Line > > >> In > > >> > >> inputs > > >> > >> > >>> like > > >> > >> > >>>> for the mic - but > > >> > >> > >>>> it could work - a small preamp that works with the input > > >> > impedance > > >> > >> of > > >> > >> > >> the > > >> > >> > >>>> Line In circuitry may be necessary to get a good input > > signal > > >> - > > >> > but > > >> > >> > >> that > > >> > >> > >>>> shouldn't be too hard > > >> > >> > >>>> to add. Also - do the internals of that chip - the > > >> > >> > >>>> > > >> > >> > >>>> https://www.pjrc.com/teensy/SGTL5000.pdf > > >> > >> > >>>> > > >> > >> > >>>> really allow the L/R Line In channels to be treated > > >> > >> independently? If > > >> > >> > >>> so, > > >> > >> > >>>> it should be good to go at least for experimentation. > > >> > >> > >>>> > > >> > >> > >>>> 73's, > > >> > >> > >>>> John > > >> > >> > >>>> AJ6BC > > >> > >> > >>>> > > >> > >> > >>>> > > >> > >> > >>>> > > >> > >> > >>>> > > >> > >> > >>>> On Mon, Oct 12, 2020 at 12:07 PM Chris Howard < > > >> [email protected]> > > >> > >> > >> wrote: > > >> > >> > >>>>> I received a good pointer about doing the BPSK > > implementation > > >> > >> > >>>>> but have just not gotten it done. > > >> > >> > >>>>> > > >> > >> > >>>>> Chris Howard > > >> > >> > >>>>> > > >> > >> > >>>>> > > >> > >> > >>>>> > > >> > >> > >>>>> On 10/12/20 11:02 AM, jimlux wrote: > > >> > >> > >>>>>> On 10/12/20 7:40 AM, paul swed wrote: > > >> > >> > >>>>>>> John really appreciate the pointer. Though it doesn't > > help > > >> > wwvb > > >> > >> > >> BPSK > > >> > >> > >>>>>>> its a > > >> > >> > >>>>>>> really good intro to SDR and DSP super simple. A good > way > > >> to > > >> > get > > >> > >> > >>> your > > >> > >> > >>>>>>> feet > > >> > >> > >>>>>>> wet. Hmmm is there a parts order soon? :-) > > >> > >> > >>>>>>> Regards > > >> > >> > >>>>>>> Paul > > >> > >> > >>>>>>> WB8TSL > > >> > >> > >>>>>> > > >> > >> > >>>>>> And the teensy has plenty of space and speed to > implement > > a > > >> PLL > > >> > >> for > > >> > >> > >>>>>> doing BPSK demodulation. > > >> > >> > >>>>>> > > >> > >> > >>>>>> > > >> > >> > >>>>>>> On Mon, Oct 12, 2020 at 10:33 AM Bob kb8tq < > > [email protected]> > > >> > >> wrote: > > >> > >> > >>>>>>> > > >> > >> > >>>>>>>> Hi > > >> > >> > >>>>>>>> > > >> > >> > >>>>>>>> The “ideal” antenna solenoid would be a bit longer ( > say > > >> 2 X > > >> > to > > >> > >> > >> 5X > > >> > >> > >>> ). > > >> > >> > >>>>>>>> The turns should be spaced apart by a few percent of > the > > >> > >> length. > > >> > >> > >>>>>>>> ( so turns over 30 or so … not so much …). > > >> > >> > >>>>>>>> > > >> > >> > >>>>>>>> How much better is “ideal” compared to “just get it > > >> done?”. > > >> > At > > >> > >> > >>> least > > >> > >> > >>>>>>>> from the stories that are told, it is significant. > Since > > >> all > > >> > >> > >> these > > >> > >> > >>>>>>>> antennas > > >> > >> > >>>>>>>> are very small (so non-ideal) it’s a bit of a snail > > race. > > >> > >> > >>>>>>>> > > >> > >> > >>>>>>>> Bob > > >> > >> > >>>>>>>> > > >> > >> > >>>>>>>>> On Oct 12, 2020, at 3:42 AM, John C. Westmoreland, > > P.E. < > > >> > >> > >>>>>>>> [email protected]> wrote: > > >> > >> > >>>>>>>>> Paul, > > >> > >> > >>>>>>>>> > > >> > >> > >>>>>>>>> Doesn't the post by Chris Howard above appear to be a > > >> > >> good/great > > >> > >> > >>>>>>>>> starting > > >> > >> > >>>>>>>>> point? > > >> > >> > >>>>>>>>> Seems like that approach could be extended. > > >> > >> > >>>>>>>>> > > >> > >> > >>>>>>>>> https://github.com/chris-elfpen/Teensy4WWVBsdr > > >> > >> > >>>>>>>>> > > >> > >> > >>>>>>>>> 73's, > > >> > >> > >>>>>>>>> John > > >> > >> > >>>>>>>>> AJ6BC > > >> > >> > >>>>>>>>> > > >> > >> > >>>>>>>>> > > >> > >> > >>>>>> _______________________________________________ > > >> > >> > >>>>>> time-nuts mailing list -- [email protected] > > >> > >> > >>>>>> To unsubscribe, go to > > >> > >> > >>>>>> > > >> > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> > >>>>>> and follow the instructions there. > > >> > >> > >>>>> > > >> > >> > >>>>> _______________________________________________ > > >> > >> > >>>>> time-nuts mailing list -- [email protected] > > >> > >> > >>>>> To unsubscribe, go to > > >> > >> > >>>>> > > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> > >>>>> and follow the instructions there. > > >> > >> > >>>>> > > >> > >> > >>>> _______________________________________________ > > >> > >> > >>>> time-nuts mailing list -- [email protected] > > >> > >> > >>>> To unsubscribe, go to > > >> > >> > >>>> > > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> > >>>> and follow the instructions there. > > >> > >> > >>>> > > >> > >> > >>> _______________________________________________ > > >> > >> > >>> time-nuts mailing list -- [email protected] > > >> > >> > >>> To unsubscribe, go to > > >> > >> > >>> > > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> > >>> and follow the instructions there. > > >> > >> > >>> > > >> > >> > >> _______________________________________________ > > >> > >> > >> time-nuts mailing list -- [email protected] > > >> > >> > >> To unsubscribe, go to > > >> > >> > >> > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> > >> and follow the instructions there. > > >> > >> > >> > > >> > >> > > _______________________________________________ > > >> > >> > > time-nuts mailing list -- [email protected] > > >> > >> > > To unsubscribe, go to > > >> > >> > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> > > and follow the instructions there. > > >> > >> > > > >> > >> > > > >> > >> > _______________________________________________ > > >> > >> > time-nuts mailing list -- [email protected] > > >> > >> > To unsubscribe, go to > > >> > >> > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> > and follow the instructions there. > > >> > >> > > > >> > >> _______________________________________________ > > >> > >> time-nuts mailing list -- [email protected] > > >> > >> To unsubscribe, go to > > >> > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > >> and follow the instructions there. > > >> > >> > > >> > > > > >> > _______________________________________________ > > >> > time-nuts mailing list -- [email protected] > > >> > To unsubscribe, go to > > >> > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> > and follow the instructions there. > > >> > > > >> _______________________________________________ > > >> time-nuts mailing list -- [email protected] > > >> To unsubscribe, go to > > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > >> and follow the instructions there. > > >> > > > > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
