[time-nuts] Burst mode TADD-2 divider modification?

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Dec 26 21:13:33 UTC 2010


Magnus Danielson wrote:
> Fellow time-nuts,
>
> To support the kind of burst measurements I am playing around with it 
> would be good to be able to generate bursts of transitions rather than 
> even clocks. Depending on the counter it may be simple (say using a 
> HP5372A) or a little more difficult (DTS 2070C).
>
> Creating a burst of 10 kHz transitions for 10 or 100 ms should be 
> possible to do in the PIC code with some hacking.
>
> Similarly creating a burst of 5 or 10 MHz clocks for 1 ms should not 
> be too hard by sniffing the clock after the input shaper and the 
> enable pulse from the PIC.
>
> I thought I would bounce this and see if people have any ideas other 
> than mine... anyone else interest...
>
> Cheers,
> Magnus
>
Since an external gate is required to implement the 5/10MHz clock burst 
it would be simpler to have a selectable pulse width for say the PPS 
output and use this to gate either the 5MHz/10MHz or 10kHz as required.

Bruce




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