Airspy R2: Interferences with antenna disconnected

Ruben Navarro Huedo (EA5BZ)

Hello Airspy friends :)

I am doing some more tests with my R2.
Here you have 2 screenshots. Both screenshots are with NO antenna and NO coax. (Only R2 connected to PC).
I am using 4 toroids on USB cable.

One screenshot with Gain 0 and another with Gain 10.

Why do i have these interferences?

Tnx a lot.

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