[time-nuts] FE-5680A's suitability for use as a 10 MHz reference for microwave transverters

Bob Camp lists at rtty.us
Thu Feb 9 11:55:52 UTC 2012


Indeed the phase noise goes up by 20 log N when multiplying. To be precise, only the phase spurs go up by 20 log N. If they are incoherent they still multiply, but you get a bit of an offset.

On Feb 9, 2012, at 2:03 AM, Javier Herrero wrote:

> El 09/02/2012 01:40, Bob Camp escribió:
>> Hi
>> Here is a little more on how much of a problem you have.
>> If you would like the spurs to be down 70 dbc at 10 GHz. They go up by 20 log N. in this case N is 1000. That gets you 60 db. Spurs at 10 MHz would have to be down at -130 dbc to make it at 10 GHz.
> As a side note (since I've just asked by), does the phase noise also go up by 20 log N when multiplying?
> Regards,
> Javier
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