[time-nuts] WWVB PM Time Questions

[paul swed]

Hello to the group. It is really hard to see. I have seen it and it is as
the NIST document states. It happens maybe every second or so out of
60-120K cycles I used a HP 3335 that allowed me to slew the phase. Its
really hard to catch.
Trace up very bright also.
Regards
Paul

On Mon, Jul 27, 2020 at 8:08 PM Dana Whitlow <k8yumdoober at gmail.com> wrote:

> That phase reversal when the waveform is not at a zero crossing probably
> adds appreciably
> more high frequency content than a phase reversal at a zero crossing.  In
> ham parlance,
> I'd say it would introduce pretty severe "key clicks".
>
> Have you considered writing a program to generate the right waveform to
> load into your
> AWG?  Then you'd have complete control.
>
> Dana
>
>
> On Mon, Jul 27, 2020 at 6:08 PM <rcbuck at atcelectronics.com> wrote:
>
> > I have been playing with the 74HCT4046 PLL over the last couple of days.
> > I have the VCO running at 90 Hz and my AWG running at 90 Hz as the input
> > source to lock the loop. The AWG is modulating the 90 Hz sine wave with
> > a PSK signal at a 9 Hz rate.
> >
> > I slowed the signals down from 60 kHz to 90 Hz to better observe the
> > phase reversal. I could see the reversal at 60 kHz but could not capture
> > it for a single sequence photo. Attached is the jpg of what the signal
> > looks like when it performs a 180 degree reversal. With my AWG the
> > reversal always occurs at the top or the bottom of the sine wave instead
> > of at the center like John Lowe shows in the WWVB document.
> >
> > I ordered parts from Mouser this morning to build the RF front end.
> > Hopefully I will be able to get a clean enough sine wave from WWVB to
> > see what their phase reversal actually looks like. Then I will have to
> > come of with the best/simplest way to detect the change. As was
> > previously mentioned, the normal phase needs to be detected at the top
> > of the minute. That means it will take at least 2 and probably 3 minutes
> > to obtain a valid date/time data transmission.
> >
> > Ray,
> > AB7HE
> >
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