FS: [US] Microsemi symmetricom 5120A-01 phase noise analyzer (1 MHz - 30 MHz)

[testpoint1]

in excellent working condition, option 01 means include internal reference; 19999 USD;
very easy to use, it is a sharp tool for the Crystal Oscillator's frequency domain testing;

https://www.ebay.com/itm/186502550445

the software version the latest 4.1.1

[testpoint1]

the Symmetricom 5120A using the cross correlation technique;

not only for frequency domain measurement (Phase noise, and Allan Deviation), also the unit can do the time domain measurement if you connect a good reference (just like Agilent 5071A);

[testpoint1]

the noise floor of 5120A is -175dBc (5125A seems is -170);

[testpoint1]

another one, I verified in excellent working condition:

https://www.ebay.com/itm/186905753464

[Leo Bodnar]

What is the phase noise sensitivity with internal reference oscillator at 1Hz offset off 10MHz carrier pre-correlation (without cross-correlation)?
Leo

[testpoint1]

please search the manual from google, 5115a VS 5120a, easy to find.

[Leo Bodnar]

On the surface -145 dBc/Hz looks very exciting but it's actually additive phase noise.

Its measurement noise floor is limited by the internal reference's phase noise.  My friends had to use cryogenic sapphire resonator with it (-135dBc/Hz at 1Hz, 10MHz carrier.)

So what is the internal reference PN at 1Hz?

Leo

[testpoint1]

On the surface -145 dBc/Hz looks very exciting but it's actually additive phase noise.

Its measurement noise floor is limited by the internal reference's phase noise.  My friends had to use cryogenic sapphire resonator with it (-135dBc/Hz at 1Hz, 10MHz carrier.)

So what is the internal reference PN at 1Hz?

Leo

as attached