Said > Actually I should have said -200dBc/Hz. > With a +13dBm carrier this corresponds to a noise voltage of 100pV/rtHz > across a 50 ohm resistor or a noise current of 2pA/rtHz flowing through it. > Even with a 1Hz noise bandwidth thats an rms fluctuation of about > 12,500,000 electrons. You have to get down to noise currents of around > 1attoAmpere/rtHz before you start "counting" individual electrons. > > Yes vibration isolation, is essential which is why their prototype was > built on a vibration isolated optical table. > > Bruce > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > Oops! I meant 12,500,000 electrons/sec. Bruce
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