[ARC5] dB Power Apples and dB Voltage Oranges, was Re: Selectivity Ratings...

[hwhall at compuserve.com]

>
Good CW operators  
can hear as little as 1.5dB change and oft times even under 1 dB will bring  
a very marginal signal out of the noise. 
>

I seem to recall that the original 1 dB definition was based on a consensus of the smallest power change in an audio circuit that could be discerned by the human ear. I've always wondered how they conducted the tests to arrive at that, though.

Wayne
WB4OGM