[time-nuts] RFTG-m-RB

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sat Jan 19 17:20:14 EST 2008


James R. Gorr wrote:
> I always assumed frequency references should be sine
> waves.  If that is not the case, I guess I can use
> this for a reference for other equipment?  And if a
> square wave is just fine, could I use a clock-block to
> divide the 15 MHz of the XO down to 10 MHz?  
If you ever have to do this, the clock block is an unnecessarily complex
solution.
Just divide the 15MHz by 3 (33.33..% output duty cycle ) using a couple
of flipflops and isolate the 10MHz component with suitable filters.
For details on the spectral composition of a 33% duty cycle square wave see:
http://www.wenzel.com/pdffiles1/pdfs/choose.pdf
> Thanks! --Jamie
>   
>
Bruce




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