[time-nuts] Encoded 1PPS signals

Azelio Boriani azelio.boriani at screen.it
Tue Jun 26 13:20:37 UTC 2012


Yes, already done: the DCF77 VLF time transmitter and others.

On Tue, Jun 26, 2012 at 3:15 PM, Clayton G <clayton at isnotcrazy.com> wrote:

> Hi Nuts,
>
> I have been building an LF transmitter, and have provision for a 1PPS
> input for calibration purposes. However I would like to be able to provide
> more time information than just the second pulses. It occurs to me that
> full time info 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.
>
> Regards
>  Clayton
>  (VK1TKA)
>
>
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