Yes, the upper limit will be one of your oscillators and it is not possible to know which one. When you have actually made the measurements, don't forget to subtract 3dB from the reading because the noise contribution of the two oscillators is power-additive being non-coherent to each other.
73,
Jeffrey Pawlan, WA6KBL
But what is there to add, if one oscillator was perfect (no phase noise at all) and the other contributed all the noise?
-- Dr. David Kirkby, G8WRB
Please check out http://www.g8wrb.org/ of if you live in Essex http://www.southminster-branch-line.org.uk/
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