[linrad] Main spectrum zero line

["cabellic" <matthieu.cabellic@xxxxxxxxxx>]

Hi

What refers the zero line of the main spectrum to exactly?
When the sound card is not connected, you see the noise floor of the sound
card, lets say 10dB. So my question is :
10dB=10*LOG10(Noise_floor/????)

Thanks!

73

Matthieu
F4BUC



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