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Its the equivalent phase noise as measured in a 1 Hz bandwidth with respect to the amplitude of the carrier. That is dBc/Hz.
Now you can make that measurement at any frequency distance away from the carrier (usually above) and that is the @xxx Khz figure.
As you get closer to the carrier the noise level will increase, and right at the carrier the amplitude will rise very steeply up to 0dBc
Here you can see -140dBc @ 40Khz
And -145dBc @ 1Mhz
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