You can solve the spur problem by using the signal to lock an oscillator.  
Some added phase noise but the oscillator can be very pure otherwise.  Many 
years ago I wrote an unsuccessful proposal for a synthesizer using that idea, 
since the spectral purity spec was too tight to use synthesizer output directly.
Frequency agility is another issue, easily solved in a synth but not so in a 
locked oscillator.
Bob
    On Tuesday, December 11, 2018, 2:29:23 PM PST, Dana Whitlow 
<[email protected]> wrote:  
 
 Ulrich,

Is it OK for us to forward the URL for your "Noise" paper to others
outside the time-nuts group?

Thanks,

Dana  K8YUM


On Tue, Dec 11, 2018 at 9:24 AM Ulrich Rohde via time-nuts <
[email protected]> wrote:

>
> https://badw.de/fileadmin/members/R/3685/6_4_18_UNI_BW_June18-safe.pdf
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