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. < j...@westmorelandengineering.com> 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 <paulsw...@gmail.com> 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. < >> j...@westmorelandengineering.com> 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. < >> > j...@westmorelandengineering.com> 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 <paulsw...@gmail.com> >> 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 <ch...@elfpen.com> >> 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. < >> > >> > > j...@westmorelandengineering.com> 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 <paulsw...@gmail.com> >> > >> 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. < >> > >> > >>> j...@westmorelandengineering.com> 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 < >> ch...@elfpen.com> >> > >> > >> 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 <kb...@n1k.org> >> > >> 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. < >> > >> > >>>>>>>> j...@westmorelandengineering.com> 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 -- 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. >> > >> > >>> >> > >> > >> _______________________________________________ >> > >> > >> 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. >> > >> >> > > >> > _______________________________________________ >> > 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.
