On 7/22/2020 7:35 AM, Rodger via time-nuts wrote:
Hey Ray,
Paul and I have a nice piece of code that generates the WWVB BPSK bit stream
using an Arduino and a ublox GPS module. (total cost under $30) You could
use this as a WWVB emulator while you're working on your code. Sorry, I
can't really help with your question about demodulating the WWVB BPSK but
the Costas loop sounds like the way to go.
Rodger
A long time ago, I built a demodulator for some weather satellite
that used BPSK that used a Costas loop driving a VCXO. I had
never built a Costas loop before, but I have to say that it was
quite straightforward and it totally worked as advertised.
The loop requires an analog multiplier, and I didn't have much
trouble sourcing it. Fast forward to today, and the same small
number of multipliers are still available, they just cost a lot.
For 60 kHz, of course, you will want to divide down a VCXO that is
at a reasonable frequency for such.
Rick N6RK
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