[time-nuts] WWVB Chronverter update progress

paul swed paulswedb at gmail.com
Mon Sep 10 10:28:55 EDT 2018


Bob
Fantastic to hear. You did the same thing I initially did and that was to
use a fluke 6060 gen locked to a GPSDO. (Not really needed but thats the
way I am set up.) Though I went further and created a good oscillator
divide chain and real modulator.
Per Bob s suggestion nothing more then a tristate gate and resistor
dividers to create the 14 db carrier drop. Truly a few cheap and simple
chips eliminate the big generator.
Most likely all of this stuff will live in a truetime DC468 case with
display. A very good second life for the Truetime.
Regards
Paul
WB8TSL

On Mon, Sep 10, 2018 at 1:12 AM, Bob Darlington <rdarlington at gmail.com>
wrote:

> I'm happy to report my Chronverter setup at the home lab is working fine.
> I'm setting my cheap wall clocks, not so cheap wrist watches, and now my
> Truetime 60-DC rack mount "NBS" time display and irig-b generator.
>
> https://youtu.be/s7DwzSggQSQ
>
> Lock light comes on, display started after about two minutes.
>
> I'm cheating and letting my signal generator produce the carrier and I
> modulate that with the chronverter (Coff setting) and it just works till I
> come up with a long term solution.
>
> Thanks everyone.
>
> -Bob N3XKB
>
>
> On Sun, Sep 9, 2018, 9:39 AM paul swed <paulswedb at gmail.com> wrote:
>
> >  Hello to the group its time for a wwvb chronverter update. I used the
> loop
> > antenna as Alex suggested. I added caps to resonate it sort of. This
> added
> > a nice 6DB increase in output power as measured by a reference antenna
> to a
> > HP 3586 slvm. I did try a transformer going from 50 ohm to .75 ohm of the
> > antenna at 60 KHz. I fear the core material isn't correct. No matter lots
> > of others I can try. Looks like the signal gets through 3 walls and some
> 30
> > ft. Getting to be Gud-enuf for setting clocks in the house. Input power
> to
> > the antenna is approx -10 dbm.
> > Plan to run the loop in the basement and that will cover the house.
> > Bob you may want t reachout and get an updated software if yours is not
> V2.
> > Bad news the DC60 expects the carrier to be within =/-.5Hz at 60 KHz I
> > measured the tuetime and spectracoms. So I built a simple chain with
> > atreasonable oscillator and simple modulator. The clocks lock up solid.
> > Since then another time nut suggested using the common 15.36 oscillator
> > that divides by 256 to give 60 KHz. Boy I sure would have liked to build
> > the system using that simple divider chain. I used a 9.6 MHz osillator
> and
> > divided by 160. Using TTL its what I had. So I must be consuming a
> > mega-watt in the dividers. ;-)
> > The key you need  real divider chain and modulator and the DC60 will be
> > very happy.
> > By the way the chronveryer puts out the Julien date so the dc60 even
> > displays that.
> > Regards
> > Paul
> > WB8TSL
> >
> >
> > On Thu, Aug 30, 2018 at 3:06 PM, paul swed <paulswedb at gmail.com> wrote:
> >
> > > The UnusualElectronics Chronverter with NEO 6 GPS, 9.6 MHz oscillator.
> > > dividers and such are all up and working. Watching GPS time,
> Spectracoms
> > > and Truetime  clocks all tick at the same time while listening to WWV.
> > > exactly as they should. Now I have a alternate for wall clocks should
> > WWVB
> > > be turned off. Though that said the next step is to test those out by
> > > setting up an antenna. Then time to mount everything in a case.
> > > If anyone else follows this path let me know offline happy to help you.
> > > Regards
> > > Paul
> > > WB8TSL
> >
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