[time-nuts] Encoded 1PPS signals
Gerhard Hoffmann
dk4xp at arcor.de
Tue Jun 26 17:24:45 UTC 2012
Am 26.06.2012 18:12, schrieb Bob Camp:
> fo could be encoded onto a 1PPS stream by changing the width of the pulse
> itself. The rising edge can be left unchanged to indicate the precise
> second, but the trailing edge can vary between (say) 100mSec and 300mSec,
> and this could encode 60 bits (with suitable idle pulses etc for
> synchronisation) in each minute. Using this I could encode full date and
> time into the 1PPS stream.
>
> My question is, does such a standard already exist, or has anyone developed
> something along this line?
> If no, I plan to implement something suitable myself, and will publish it
> should it be useful to others.
>
You could recycle the DCF77 format:
<http://www.ptb.de/cms/en/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77.html>
There seem to be decoders for it on the net.
regards, Gerhard
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