Gain vs. Spectrum noise floor

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

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  • #1922
    Prism
    Participant

    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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