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

[mac]

1db above the ambient noise floor
On Oct 29, 2013, at 6:25 PM, hwhall at compuserve.com wrote:

>
> >
> 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
>
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