Did you hook the touch screen up? I didn't as there was no reason to. On Wed, Nov 4, 2020 at 1:19 PM paul swed <[email protected]> wrote:
> Nope never seen it. Its as if the display is writing vertically and > horizontally. > > > On Wed, Nov 4, 2020 at 11:55 AM John C. Westmoreland, P.E. < > [email protected]> wrote: > >> Paul/Chris, >> >> Also - in addition to the white screen, I get this sometimes after running >> for a while - have you guys seen this? >> >> >> https://user-images.githubusercontent.com/2308903/98118247-cd4c7b00-1e5f-11eb-8510-aa1ed0beba52.jpg >> >> 73's, >> John >> AJ6BC >> >> >> On Wed, Nov 4, 2020 at 1:44 AM John C. Westmoreland, P.E. < >> [email protected]> wrote: >> >> > Paul, >> > >> > Thanks for the info. I took some good measurements on the signal coming >> > in on one of the small ferrite antennas when the signal was fairly OK - >> I >> > measured >> > 4-9 uV. I haven't done this same measurement yet on the antenna I'm >> > testing on - I didn't think I could be over driving the mic input but >> > that's a possibility. Also, I haven't done a great job in assembling >> this >> > project - I need to neaten things up and maybe encase in a housing >> > that will reject RFI, etc. >> > >> > Thanks for mentioning this. I have ordered one of those nice antennas >> > from Stormwise but I'm still waiting to receive it. >> > >> > 73's, >> > John >> > AJ6BC >> > >> > >> > >> > >> > On Tue, Nov 3, 2020 at 12:13 PM paul swed <[email protected]> wrote: >> > >> >> By the way thats leads. A typo. >> >> It just hit me I had to cut the signal down so that the signal graph >> was >> >> in >> >> the middle. >> >> On the large antenna thats a 330K resistor to a 100K pot. >> >> For the wwvb simulator its simply the 100K pot turned up about 2/3rds >> of >> >> the way. The simulator is something like 60 uv out. >> >> Maybe you have a overdrive issue. >> >> Regards >> >> Paul. >> >> >> >> On Tue, Nov 3, 2020 at 9:49 AM paul swed <[email protected]> wrote: >> >> >> >> > John >> >> > Yes I have used Chris's code to decode the wwvb AM timecode. I am in >> >> > Boston so just about as far away as you can get. Though maybe >> Florida is >> >> > further. But Boston is in more of a null from wwvb. >> >> > Granted the antenna is a tuned 10' X 10' 800 ft of wire loop and >> preamp >> >> > mentioned numerous times on time-nuts. It reliably during the day >> >> delivers >> >> > 100 uv at the end of the coax. >> >> > I found the teensy wwvb sdr really worked best during the day. With >> >> > respect to power for the antenna its just a power inserter I built, >> 8 Mh >> >> > choke, 100 ohm resistor, .47 uf coupling cap to the teensy. No magic >> at >> >> all. >> >> > One very serious issue with the teensy is that the audio module must >> be >> >> > directly stacked on to the cpu. I originally used 3" leeds those >> little >> >> > jumpers. It makes a mess of the clock signals. >> >> > Regards >> >> > Paul. >> >> > >> >> > On Mon, Nov 2, 2020 at 10:55 PM John C. Westmoreland, P.E. < >> >> > [email protected]> wrote: >> >> > >> >> >> Paul, >> >> >> >> >> >> Have you successfully decoded WWVB with Chris's code? >> >> >> >> >> >> I haven't gotten that to work. >> >> >> >> >> >> I'm using the same antenna set up I've used that works with the >> >> multipsk >> >> >> Clock program to decode WWVB that will decode fairly reliably as >> long >> >> as >> >> >> atmospheric conditions are favorable. >> >> >> >> >> >> Note, if using the Arduino IDE and you're connected to a PC; it will >> >> >> sometimes set the clock on the TFT to the PC's clock; I'm mentioning >> >> that >> >> >> since some that try this could think their set up is synced to WWVB >> >> when >> >> >> it >> >> >> actually grabbed time from the PC. Maybe the loader from Teensy >> does >> >> >> that; >> >> >> I haven't looked close enough yet to know for sure what's setting >> that. >> >> >> >> >> >> Glad you're making progress with your approach. >> >> >> >> >> >> 73's, >> >> >> John >> >> >> AJ6BC >> >> >> >> >> >> >> >> >> On Mon, Nov 2, 2020, 18:20 paul swed <[email protected]> wrote: >> >> >> >> >> >> > John thats exactly what Chris did. Its the teensywwvb.ino. It >> decodes >> >> >> the >> >> >> > AM timecode just as the DCF code does. In fact Chris's code is >> >> derived >> >> >> from >> >> >> > the DCF code with the changes you are asking about and it works. >> >> >> Download >> >> >> > his solution and read the comments throughout. The original DCF >> >> comments >> >> >> > are in it also. >> >> >> > >> >> >> > Its the starting point for the tinkering I am doing towards a BPSK >> >> SDR. >> >> >> > Thats a big leap for me. >> >> >> > What the code gives you is the frontend gain, followed by a >> bandpass >> >> >> > filter. Multiplier that mixes the LO and incoming signal to a >> lowpass >> >> >> > filter. Then on to AM detection and AGC. >> >> >> > >> >> >> > If you don't care to install the arduino IDE with teensy extension >> >> just >> >> >> use >> >> >> > notepad ++ to look at the code. Pretty exciting. >> >> >> > >> >> >> > Regards >> >> >> > Paul >> >> >> > WB8TSL >> >> >> > >> >> >> > On Mon, Nov 2, 2020 at 8:24 PM John C. Westmoreland, P.E. < >> >> >> > [email protected]> wrote: >> >> >> > >> >> >> > > Hello Time Nuts, >> >> >> > > >> >> >> > > I have a question - >> >> >> > > >> >> >> > > Has anyone been successful getting WWVB to decode using the >> example >> >> >> for >> >> >> > > DCF77 and making the changes for WWVB? >> >> >> > > >> >> >> > > Chris has his own approach - it's interesting - but on my setup >> at >> >> >> least >> >> >> > I >> >> >> > > haven't been successful with it - maybe it's my antenna - not >> sure >> >> >> just >> >> >> > > yet. >> >> >> > > Also - my screen eventually 'whites-out' after running that for >> a >> >> >> while - >> >> >> > > meaning - the screen goes completely white and I don't know >> what's >> >> >> doing >> >> >> > > that yet - I suppose it's a bug of some sort. >> >> >> > > >> >> >> > > But, with the DCF77 approach - it appears to identify bits OK - >> >> with >> >> >> the >> >> >> > > code having only minimal changes - so I'd like to go down that >> >> path. >> >> >> > > >> >> >> > > Note - I have a fork here - but it's debug - and not sure it's >> >> worth >> >> >> > > anything other than looking at some of the data that's being >> >> dumped. >> >> >> > > https://github.com/jwestmoreland/Teensy-DCF77 >> >> >> > > >> >> >> > > For DC7FF - the AM is just 0.2ms (1) and 0.1ms (0) with no AM at >> >> the >> >> >> > minute >> >> >> > > marker, but WWVB is a little more complicated - >> >> >> > > 0.2ms (0), 0.5ms (1), and 0.8 ms (Marker) - 2 consecutive >> markers >> >> mark >> >> >> > the >> >> >> > > end of current minute/beginning of next minute. >> >> >> > > >> >> >> > > The DCF77 code seems to take some advantage of the signal >> >> level/timing >> >> >> > and >> >> >> > > the dimensions of the TFT display for >> >> >> > > displaying the signaling - at least that's what it appears to me >> >> right >> >> >> > now >> >> >> > > unless I'm looking at this wrong - I guess that isn't >> >> >> > > a big deal until you try to deal with the marker timing for >> WWVB - >> >> of >> >> >> > > course I could be looking at this wrong right now too. >> >> >> > > >> >> >> > > Maybe trying something like the Goertzel algorithm like KE9NS >> has >> >> >> done in >> >> >> > > his work with WWV is worth taking a look at too with >> >> >> > > this setup. >> >> >> > > >> >> >> > > 73's, >> >> >> > > John >> >> >> > > AJ6BC >> >> >> > > >> >> >> > > >> >> >> > > >> >> >> > > >> >> >> > > >> >> >> > > On Sun, Nov 1, 2020 at 10:50 AM Mike Feher <[email protected]> >> >> wrote: >> >> >> > > >> >> >> > > > Too bad I am an old retired hardware engineer and know nothing >> >> about >> >> >> > > these >> >> >> > > > new SW controlled devices. Have Fun - Regards - Mike >> >> >> > > > >> >> >> > > > Mike B. Feher, N4FS >> >> >> > > > 89 Arnold Blvd. >> >> >> > > > Howell NJ 07731 >> >> >> > > > 848-245-9115 >> >> >> > > > >> >> >> > > > -----Original Message----- >> >> >> > > > From: time-nuts <[email protected]> On Behalf >> Of >> >> >> paul >> >> >> > > swed >> >> >> > > > Sent: Sunday, November 1, 2020 12:48 PM >> >> >> > > > To: Discussion of precise time and frequency measurement < >> >> >> > > > [email protected]> >> >> >> > > > Subject: Re: [time-nuts] WWVB teensy BPSK early experiments >> >> >> > > > >> >> >> > > > John sent the link on the teensy wwvb AM receiver. It can >> easily >> >> be >> >> >> > > > shifted to other frequencies. Using the work Frank dcf77 and >> then >> >> >> Chris >> >> >> > > > wwvb did with the PJRC audio design tool gives quite a bit of >> >> >> insight >> >> >> > to >> >> >> > > > the work that was done. >> >> >> > > > The system assumes a sample rate of 192Khz. That limits the >> >> receive >> >> >> > range >> >> >> > > > to about 98KHz. >> >> >> > > > I have not been able to confirm the rate I am using is 192Khz >> and >> >> >> when >> >> >> > > the >> >> >> > > > set command is used its not recognized. So somethings up. >> >> >> > > > The design Chris has essentially is a microphone input with >> some >> >> 38 >> >> >> db >> >> >> > of >> >> >> > > > gain feeding a bandpass filter around 60 KHz to a multiplier >> (RF >> >> >> mixer) >> >> >> > > > then a low pass filter. Chris and Franks design is much more >> than >> >> >> these >> >> >> > > few >> >> >> > > > words with spectrum display, signal level, and AGC. >> >> >> > > > So without any effort the frontend solution is sitting in the >> >> teensy >> >> >> > that >> >> >> > > > cuts out a bunch of typical wiring. Granted its not as tight >> as >> >> >> > discrete >> >> >> > > > components can be. But its a chunk of software code. No digi >> key >> >> >> orders >> >> >> > > for >> >> >> > > > L & Cs... :-) The output of the chain is 600 Hz audio that >> does >> >> >> contain >> >> >> > > the >> >> >> > > > phase changes. >> >> >> > > > >> >> >> > > > But the trick is creating the true I & Q channels. Not an >> issue >> >> to >> >> >> add >> >> >> > a >> >> >> > > > second multiplier and chain did that last night. But at >> >> someplace a >> >> >> 90 >> >> >> > > > degree phase change or delay needs to occur. >> >> >> > > > Or as suggested a hilbert transform. >> >> >> > > > Regards >> >> >> > > > Paul >> >> >> > > > WB8TSL >> >> >> > > > >> >> >> > > > >> >> >> > > > >> >> >> > > > >> >> >> > > > _______________________________________________ >> >> >> > > > 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.
