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