[time-nuts] WWVB PM Time Questions

[paul swed]

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 driver. There is always current going through the diodes. Either
forward or reverse.
Other possibility your over driving the flipper. I just built one up to
actually create the BPSK signal. Found that it needed to stay below -8dbm
otherwise it would distort. But increasing the current allowed me to go to
-3dbm.
Regards
Paul


On Wed, Aug 19, 2020 at 3:49 AM <rcbuck at atcelectronics.com> wrote:

> 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 going into pin 8 of the mixer transformer. I expected to see a sine
> wave out of pin 1.
>
> However, I looked at the code again and it appears the "LO" port of the
> mixer is only driven one per second. There is no steady drive to the
> "LO" port so there cannot be a sine wave out of the "IF" port. Is that
> correct?
>
> Or should there actually be a 60 kHz sine wave coming out of pin 1 on
> the mixer? If so, something is wrong with my d-psk-r. I am not trying to
> use it with any kind of receiver. I just want to see the sine wave on my
> scope.
>
> Ray,
> AB7HE
>
> -------- Original Message --------
> Subject: Re: [time-nuts] WWVB PM Time Questions
> From: paul swed <paulswedb at gmail.com>
> Date: Tue, August 18, 2020 12:19 pm
> To: Discussion of precise time and frequency measurement
> <time-nuts at lists.febo.com>
>
> Ray I would tend to agree but I actually am unclear on the context.
> Did you actually build a d-psk-r?
>
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