[time-nuts] WWVB Chronverter update progress

Bob Darlington rdarlington at gmail.com
Mon Sep 10 01:12:02 EDT 2018

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.


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
> 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
> > 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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