Lots of questions.
The d-psk-r is intended to be just after the receive preamp. So the signal
is something like 30-100uv or -90 to -70dbm region. If you are creating a
modulator then yes -3 to-7dbm would be right. But its the current through
the diodes that control distortion. At -70 you don't
Paul and Rodger,
I used the actual transformer, YCL 20F001NG, and 1N4148 diodes like the
schematic shows. I isolated the grounds on the mixer because Rodger had
a note in the document saying he was picking up noise.
I experimented with the 60 kHz drive level and increased it to 285 mV
Pk-Pk,
Paul,
You message came in just as I clicked Send on my message. If I change
the MC34151 to a 7474 to synchronize the 60 kHz signal, does that mean
the phase change always occurs on the zero crossing like WWVB?
Ray
Original Message
Subject: Re: [time-nuts] WWVB PM Time
Alright Ray we can gang up on you with two of us.
By the way with respect to a BPSK modulator as mentioned I did just did
that and without any special driver chip. I used a ttl 7474 to synchronize
the 60 KHz reference to the incoming data.
Data in to D and 60 KHz to C, Q and QNot to 180 ohm R to
Ray,
I'll answer your question as I've done this. The d-psk-r's intended use is
to remove the bpsk from the WWVB carrier for the purpose of allowing older
WWVB receivers to recover phase info from the carrier and it works very well
for that purpose. But, it can also be used, as you are trying
Hi Ray yes actually a sine wave out. So something is wrong. Are you
actually using a mixer or the transformers and diodes I suggested?
Including a schematic that I believe is easier to read than the original
from 2015.
Note that the diodes are floating and that each side actually goes to an
active
Paul,
Yes, I built the d-psk-r per the schematic. However, I think I did not
understand how it actually worked. I was expecting it to be able to
duplicate the WWVB sine wave signal with the phase reversal present when
the PM data bit changed from a 0 to 1 or 1 to 0. I have a 60 kHz sine
wave
