[time-nuts] Adjusting HP 5065A frequency

Hal Murray hmurray at megapathdsl.net
Thu Oct 25 04:45:18 UTC 2012


lists at rtty.us said:
> The gotcha with the DDS is phase truncation. That pretty much trashes the
> ADEV. 

Thanks.

How should I think about the output of a DDS?

Lets assume I'm interested in the frequency domain where the "error" is 
measured in phase noise.  For a DDS, I think they are spurs.

Suppose I have a clock running at 101 MHz and I want 10 MHz.  Is the output 
10 MHz with some spurs, or 10.1 MHz with some spurs?

Are there rules of thumb for the size and location of the spurs?  (given the 
input freq and output freq)


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