[time-nuts] WWVB update on the remodulator released last year. Its racked and stacked

[paul swed]

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 <paulswedb at gmail.com> 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
>
>