Gain vs. Spectrum noise floor

SDRPlay Independent Community Forum › Forums › SDRUno › Gain vs. Spectrum noise floor

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  • October 2, 2021 at 6:52 am #1922
    Prism
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      SDRUno confuses me – I had been using SDR# for a long time:

      When increasing the gain slider in the Main window, the noise floor decreases.
      On a sample 462Mhz frequency, noise floor at minimum gain – shown as 21.3db – is -90 dbm.

      Increasing gain towards 78 dbm, lowers the noise floor to around -120 dbm

      Does not quite make sense to me, anyone can explain ?

      Regards
      Mike

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