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I don't know if this has been previously reported in this group, but

Adam Farson published his test results of the Airspy HF+ in April

2018: 

http://www.ab4oj.com/sdr/airspy/airspy_hf_notes.pdf .  In it he

concludes that the Airspy HF+'s Noise Power Ratio (NPR) measured

between 62 dB and 54 dB is "By comparison, the Perseus has 75 dB NPR

at higher noise loading levels, i.e. higher signal strength per

equivalent channel."

 

Are these test results also appropriate for the Airspy HF+ Discovery?