[time-nuts] Homebrew WWVB simulator

paul swed paulswedb at gmail.com
Wed Sep 15 02:52:18 UTC 2010


Good use for an old case.
My irig clock uses and old truetime dc468 sat recvr case.
I find them these days at hamfests for $5.
Very nice display.

On Tue, Sep 14, 2010 at 6:36 PM, Murray Greenman
<Murray.Greenman at rakon.com>wrote:

> I designed and built a similar thing a while back, which emulated the
> full VNG time code (which could be decoded by 'Radio Clock' and other
> clock software).
>
> My unit was GPS locked, using two microcontrollers, but it wouldn't need
> to be that complex for setting clocks/watches. It generated all the
> required ticks and time code pulses as various audio tones using a
> direct digital synthesizer which operated in an interrupt in the micro
> firmware.
>
> The WWVB code would be fairly straight-forward to implement, even
> including the phase advance, if you generate the 60kHz directly using
> DDS within the micro. I might look into that as a future project.
>
> My 'VNG in a Box' design is at www.qsl.net/zl1bpu/MICRO/VNGBOX/
>
> Regards,
> Murray ZL1BPU
>
>
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