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Noise floor

I am curious about one thing with my 6600 radio.

When I first turn it on and run Smart SDR, as an example, my noise floor might be 120 (just as an example). If I hit the tune button and then turn tune off, the floor will jump to 110. This happens every time I turn it on.

What causes that ? Is it normal ?

Thanks es 73

Ken - W4CCZ

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