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.
