[time-nuts] WWVB PM Time Questions

[paul swed]

Ray Yes you have it correct. The flipper is bidirectional. It either adds
flips or removes them.
It does read the nema second per minute in the 59th second. Then depends on
the 1 pps for an accurate phase flip. The flip is 100 ms into the second
and by propagation delay to the east 5-7ms. Though the reality is if the
flips not exact the phase tracking receivers work just fine.
But beyond the simple reading of the nema sentence its the magical
conversion to the new wwvb message format thats quite difficult. Then they
turned on teh slow code and Rodger and I worked that issue. That actually
took some months to resolve the fast and slow code integration.
So as a transmitter put the software on an arduino or bluepill. Since you
are just doing work locally the nema sentence can be repeated over and over.
Regards
Paul
WB8TSL

On Fri, Jul 31, 2020 at 12:01 AM <rcbuck at atcelectronics.com> wrote:

> Paul,
>
> I wasn't talking about putting the d-psk-r software on the Blue Pill
> board. The d-psk-r software will be on the Arduino board.
>
> What I was thinking of doing was putting a single NEMA message on the
> Blue Pill board. Then connect the UART transmit line to the Arduino in
> place of the GPS UART line. That way I could send the same NEMA message
> without having it change every minute. I would count 60 (or maybe 62)
> pps coming from the GPS and I would know the Arduino was ready for the
> next NEMA message.
>
> Initially I will use the GPS UART transmit line to confirm the
> Arduino/GPS combo works. Then play with sending my own NEMA GPRMC
> message from the Blue Pill board.
>
>
> It appears your software simply reads the TX buffer of the GPS until it
> is empty once per minute and then proceeds to parse the NEMA time/date
> information out one bit per second. However, the La Crosse Ultratomic
> clock would not work with this data stream since you are stripping the
> phase reversals out. Is that correct?
>
> I want to extract the time information only. So I would feed the 60 kHz
> sine wave into the preamp wire on the flipper board. Is that correct?
>
> Ray,
> AB7HE
>
> -------- Original Message --------
> Subject: Re: [time-nuts] WWVB PM Time Questions
> From: paul swed <paulswedb at gmail.com>
> Date: Thu, July 30, 2020 5:14 pm
> To: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
>
> Ray
> Are you speaking to the d-psk-r software? Its quite a bit more involved
> than what you mentioned. Its in the coding sequence. But could it be put
> on
> a bluepill absolutely. Its worked on all of the arduinos we have tried.
> The
> other thing is that by feeding a 60 KHz CW signal into the d-psk-r
> modulator/flipper it turns the signal into a wwvb bpsk signal. No AM
> modulation. But for bench testing its a noise free signal.
> But I am interested in the approach you are trying to develop that I
> guess
> might be a SDR solution. Good luck looking forward to your success.
> Regards
> Paul.
>
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