SDRplay RSPduo: Low noise short wave reception in combination with USB noise filter FX-AUDIO-PGN II

I implemented FX-AUDIO-PGN II USB stabilizer (only 20 US dollars) that includes USB noise filter to achieve low noise quiet short wave reception in combination with RSPduo of SDRplay. Noise from PC via USB cable is removed by the USB noise filter. The 5V current for RSPduo is supplied by a noiseless linear power supply via PGN II.

Radio: SDRplay RSDduo
Antenna: ApexRadio 303WA-2
Power supply: L.K.S Audio LPS-25-USB linear power supply

FX-AUDIO-PGN