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Can 9640A-LPN phase noise be improved?

Anyone know if when using the Fluke 9640A-LPN if you run it on a very low phase noise 10 MHz source (Wenzel oscillator) if the phase noise of the 9640A-LPN improves significantly or not, compared with its internal freq reference?

I'm waiting on an Agilent (Keysight) N9030A (PXA) to test this, but thought I would check with the experts here.  smiley

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Christian Tarr

The phase noise is dependent upon the LO not the time base reference. So unfortunately, a cleaner reference will not clean up a dirty source. You r best bet would be to use a Keysight E8663D PSG if you need ultra-low phase noise or an old HP/Agilent 8664 if you have one. 

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Christian Tarr

Or you could use a combo of an 8663/8664 like the Air Force does or you can upgrade your 9640-LPN to an 9640-LPNX. 

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David Martson

The Fluke 9600FLT Wide Offset Phase Noise Filter is designed to operate with the 9640-series generators in a similar fashion as either the 1.0001 GHz Notch Filter (Trilithic CFN-2-1000.1) or 1 GHz Band Pass (0955-1612 ) that Keysight (Agilent) recommends for use with its PSG or 8665B generators. The 9600FLT works well when used to verify noise performance of PxA analyzers. (The noise specifications of these analyzers are quite good, mandating the use of a filter to verify their perfomance, regardless of the make and model of generator used to test it.)

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