[time-nuts] Phase noise measurement (was - no subject)
lists at rtty.us
Tue Aug 24 20:35:54 UTC 2010
If the sidebands are un-correlated noise then they add as power (3db). If they are correlated they add as voltage (6db). Noisy modulation processes produce correlated sidebands.
Close in noise likely comes from a modulation process. Far removed noise is unlikely to be a result of modulation.
On Aug 24, 2010, at 4:24 PM, dk4xp at arcor.de wrote:
> Von: Bob Camp <lists at rtty.us>
>> If you start with a mixer that runs 500 mV / radian (an RPD-1 at the typical
>> 8 mV / degree + 10%) then -180 below that would be 0.5 nV. Since noise it
>> coherent close in, the DSB to SSB process nets you 1 nV out when you have
>> -180 dbc noise.
> Adding the two sidebands may double the power, but not the voltage?
> 73, Gerhard
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