[time-nuts] Question about SA.33 Rb clock

Bob kb8tq kb8tq at n1k.org
Sun Oct 15 22:51:36 UTC 2017


> On Oct 15, 2017, at 12:47 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> kb8tq at n1k.org said:
>> Today DDS based loops let manufacturers use a *lot* more cells than they
>> could use “back in the old days”.
> I'd expect that to produce close in spurs that would be ugly in some 
> applications.
> Is that info in the data sheet and/or are designers clued in?

Welcome to any number of telecom Rb’s …. 

The gotcha is that the spur spec’s are not always met. As you might guess, doing 
testing over really wide DDS ranges is impractical. Some designs use cleanup loops.
The gotcha then becomes a spur (say at 0.053 Hz) that is inside the cleanup loop 
bandwidth ….


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