Airspy noise figure


Hi - I've been setting up a system to measure noise figures of SDRs in real time, an extension of some similat tests we performed a few years ago:

I'm getting a NF of 7-8dB for a new Airspy R2 and Airspy mini.  The spec quotes 3.6dB.  Has anyone else measured the NF?

I note the 3.6dB figure is exactly the same as the front end tuner R820 tuner.  However a system noise figure will always be poorer than the front end device.



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