[time-nuts] Low cost synchronization
Mike Ciholas
mikec at ciholas.com
Fri Aug 19 00:00:34 UTC 2005
On Fri, 19 Aug 2005, Poul-Henning Kamp wrote:
> >2. WWVB Receiver
>
> This is probably the most feasible means.
Yes, I concur for at least the US. A 60KHz will get us US,
something in England, and Japan (decoding software needs to be
different, but not the radio parts). Maybe that's good enough.
> The company used to be called "Temic", not sure if they are
> still called that.
I've found two:
http://www.mas-oy.com/archive/da9180.pdf
This looks like the winning solution. Here is the TEMIC:
http://www.ortodoxism.ro/datasheets/Temic/mXyzuryv.pdf
This seems to not be as well supported.
If anybody knows any more, please let me know.
I have disassembled several WWVB watches. Of course, they are
all COB (chip on board), but just from the chip dimensions, I
know the chips they use (and the WWVB part seems to be separate
from the watch logic otherwise) aren't either one of the above.
Strange. Must be a high volume bare die house somewhere that is
doing this.
Our concept might well benefit from COB due to our volumes
(>10,000, perhaps millions).
--
Mike Ciholas (812) 476-2721 x101
CIHOLAS Enterprises (812) 476-2881 fax
255 S. Garvin St, Suite B mikec at ciholas.com
Evansville, IN 47713 http://www.ciholas.com
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