I would like to say here, if the phase noise testing using DUT as the frequency reference, I have no word; if test for 10MHz (usually is), 1Hz offest (dBc level), are you sure the 10MHz DUT is 10.000000MHz ? if the DUT frequency is not accurate (eg 10.000000 is 10.000002 MHz), any mean for test the "phase noise" of 1Hz (10,000,001Hz) ?
I try to use a hign dynamic spectrum analyzer to test the parameter.
we used the atomic oscillator the demodulation wireless signal, we just care the frequency stability, sorry, never test the phase noise, if someone can test it, just paste here your test result and test diagram.