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 <[email protected]> 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 <[email protected]> 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 <[email protected]> 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 > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to http://lists.febo.com/mailman/ > listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
