[time-nuts] WWVB Dephaser Question

[John C. Westmoreland, P.E.]

Hello All,

Are there any design details someplace regarding these massive antennas?

Thanks,
John
AJ6BC


On Thu, Oct 8, 2020, 19:27 paul swed <paulswedb at gmail.com> wrote:

> Hello to the group.
> Ray as Bob mentions you are taking a 10s of uv signal to a logic level of
> maybe 4V.
> If the loop is any place close to the divided down signal, it will
> oscillate. It would take incredible shielding to protect the receiver.
> Thats why you often see a solution that doubles to 120 KHz and modifies the
> detectors to work at that frequency. That means hacking the radio
> internally. Not fun. The other really annoy effect is that the doubling
> slips phace due to noise and propagation. So if charting suddenly you get a
> 180 degree flip. Thats messy.
> The doubling solution can work. Search for carter and there are several
> others.
> But having tested and used all of the alternates and lots more on the east
> coast decided they were too much trouble. You should see the box of boards
> I have chuckle.
> For me I am very happy with the d-psk-r. Though in being above board I
> designed version 1 and Rodger and I did version 2. Its solid and no mods to
> any receiver. Everything has always been released to the time-nuts group.
> As they say have fun.
> Regards
> Paul.
> WB8TSL
>
> On Thu, Oct 8, 2020 at 5:39 PM <rcbuck at atcelectronics.com> wrote:
>
> > Bob,
> >
> > I am using a ferrite rod antenna for the receiver. No outside antenna.
> >
> > Ray
> >
> > -------- Original Message --------
> > Subject: Re: [time-nuts] WWVB Dephaser Question
> > From: Bob kb8tq <kb8tq at n1k.org>
> > Date: Thu, October 08, 2020 12:40 pm
> > To: Discussion of precise time and frequency measurement
> > <time-nuts at lists.febo.com>
> >
> > Hi
> >
> > A lot depends on your antenna setup. You can also swamp out the incoming
> > WWVB signal…….
> >
> > Bob
> >
> > > On Oct 8, 2020, at 2:07 PM, <rcbuck at atcelectronics.com> <
> > rcbuck at atcelectronics.com> wrote:
> > >
> > > I have read several different articles where the WWVB phase shift is
> > > eliminated by doubling the signal to 120 kHz. Several members of the
> > > list have built these units.
> > >
> > > Assume I build a circuit to double the incoming signal and use a
> schmitt
> > > trigger to get a 120 kHz square wave. If I then divide that signal back
> > > down to 60 kHz will that signal be strong enough to swamp out the WWVB
> > > signal? I'm guessing it will be since it is at the 5 volt level and
> > > somewhere in the +25 dBm or greater range.
> > >
> > > Ray,
> > > AB7HE
> > >
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