[time-nuts] 50:50 duty from a PRS10

Charles P. Steinmetz charles_steinmetz at lavabit.com
Thu Jul 21 18:34:32 UTC 2011


Chris wrote:

>How close to 50% duty cycle do you need.  is 0.50 good enough or do
>you need 0.500000000 ?  If all you need is 15% accuracy a 555 timer
>set up to make a 0.5 second pulse would work but if you need better,
>then maybe a phase lock loop with a much higher than 1Hz oscillator
>and then you divide that down to 2Hz and the 2Hz triggers a flip flop.

The PRS-10 already has a 10 MHz output locked to the 1 pps.  Just 
count the 10 MHz.

Best regards,

Charles










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