[time-nuts] WWVB PM Time Questions

[rcbuck at atcelectronics.com]

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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