[time-nuts] Encoded 1PPS signals

[paul]

On 6/26/2012 9:15 AM, Clayton G 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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I think you describe modifying IRIG. Just a thought
Regards
Paul.