To be very clear the remodulator is only for clock systems that display time as I have listed above. It will not fix 117, 599, 207s 8163 or any other phase tracking system. That said the remodulator fixs about 50% of whats out there. I am collecting emails from several people so will email everyone in a day or so. Google mails kind of a pain in that respect. Regards Paul.
On Sun, Jun 29, 2014 at 11:04 AM, paul swed <[email protected]> wrote: > Hello to the group. Been a while. > Wanted to update the group on the WWVB remodulator that allows receivers > like the spectracom 8170, Netclock 2 and Truetime DC60 to work with the new > BPSK signal and display accurate time. > > The plan had been to leverage the accurate d-psk-r 60 Khz clock for the > remodulator. But Its been a while and I simply decided to build the whole > remodulator up in a separate 1 RU box. Took no time at all. Hardest part > was drilling holes for BNC connectors. > > I had a concern on frequency stability and the fact is the internal > crystals of these radios is +-40 Hz. Simply not an issue. > The DC60 would loose lock frequently. Turns out the DC60 had a bad molex > connector on the 5 VDC supply. Fixed issue problem gone. > > However I did upgrade the 60 Khz clock from the pure crystal that did work > to a 15.360 Mhz oscillator (Vectron) divide by 256 using a 74HC393 chip to > feed the modulator a 74HC08. I used all 4 sections of the 08 to create 2 > outputs that split to feed 6 total ports with 1.8K ohm pull downs for those > radios that sense a antenna. All of the wwvb clock units work and I have 2 > spare ports. > Updated the schematics and if anyone wants a set let me know. > > What really motivated me was several thread with another time nut and I > decided, why wait build a separate box and be done. > > Also will send a separate email discussing the small atomic clocks and how > to use them for the remodulator. > Regards > Paul > WB8TSL > > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
