Hi
Thank you for the clarification and rf-tools link. Agree with your calculation. That’s why I raised this question regarding a fixing PN degradation by Pendulum CNT-91. Could you please explain where is the error in my reasoning of the experiment : * There is one 10 MHz OCXO with ADEV = 5 mHz * There are two boards (DUT1 and DUT2) which multiply 10 MHz OCXO signal by 2.5 using the PLL method * DUT1 has 25 MHz output signal with high PN (checking by air and by measurement of S/N) * DUT2 has 25 MHz output signal with low PN (checking by air and by measurement of S/N) Experiment’s steps: * Step 1: DUT1 ADEV measuring gives me a value of 60 - 70 mHz instead of the expected 12.5 mHz (5 mHz x 2.5) * Step 2: DUT2 ADEV measuring gives me a value of 10 - 12 mHz which matches the expected 12.5 mHz (5 mHz x 2.5) * Step 3: based on ADEV values which in the first case (DUT1) are much greater than expected and in the second case (DUT2) coincide with the expected I conclude that PN of the output signal from DUT2 will be lower than from DUT1. I can see this PN degradation using Pendulum CNT-91 only as R&S FSQ8 does not fixate any PN degradation between DUT1 and DUT2 Karen, ra3apw _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe send an email to [email protected]
