The following paper details a method used by NIST for PM and AM noise measurement system calibration.
http://tf.nist.gov/timefreq/general/pdf/1000.pdf An accuracy of 0.14dB or better is possible. Unlike the beat frequency method a phase detector with a sinusoidal response isnt required. The effect of the PLL is also accounted for, this is particularly important at low frequency offsets. Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
