Ron D'Eau Claire wrote:
>
> Quite right Bill, in an audio laboratory or perhaps in a very quiet
> telephone circuit.
>
> But radio communications is different according to what I learned in
> school,
> lo' these many years past. Over half a century ago most radio
> communications
> engineers began using 3 dB (2:1 power ratio) as the minimum change in a
> signal level that would normally be just discernable to the listener,
> considering typical band noise and QSB. That was based in actual
> on-the-air
> observations by a great many operators over time.
>
Ron I cited the reference for the 1 dB definition. Please provide the same
for your 3 dB number. 160 meters is a very good audio laboratory IMHO. It
quickly separates those who can hear from those who cannot.
73, Bill
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