[time-nuts] WWVB Dephaser Question

[John C. Westmoreland, P.E.]

Bob,

Thanks for the answer; but does anyone actually have a documented
specification posted for one of these 'massive' WWVB 60kHz antennas
someplace?

Thanks.

73's,
John
AJ6BC


On Fri, Oct 9, 2020, 08:35 Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> At least to me, anything dimensioned in the 100’s of feet is “massive”
> compared to
> the rod antennas normally seen in WWVB use ….
>
> The other point being that if the antenna is some sort of large loop, it’s
> going to be
> a good long ways away from the receiver. You get both a larger signal
> voltage and better
> isolation …..
>
> Bob
>
> > On Oct 8, 2020, at 11:30 PM, John C. Westmoreland, P.E. <
> john at westmorelandengineering.com> wrote:
> >
> > 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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