I did not know either but didn't see anything in the pgm. On Wed, Nov 4, 2020 at 6:08 PM John C. Westmoreland, P.E. < [email protected]> wrote:
> Paul, > > Yes I did; I have the touchscreen controls wired up because I didn't know > if they were being used or not for sure. > > I'll disconnect those now. > > Thanks. > > 73's, > John > AJ6BC > > > > > On Wed, Nov 4, 2020, 10:34 paul swed <[email protected]> wrote: > > > 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. > > > _______________________________________________ > 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.
