Mike Besemer (WM4B) wrote:
> How, it the real world of ham radio, do you experience hearing the
> difference of 3dB daily?
> I'm not talking about a lab.
3dB is the difference between unreadable and barely readable against the
noise floor. The difference between the 3kHz and 2.4kHz IF filter on
SSB is a lot less than 3dB and readily audible on a weak signal (on HF).
It's probably the difference between somewhat noisy and full quieting
on a FM rig.
At threshold, 3dB is important.
At S9 or 60 over, 3dB is irrelevant.
Now, if you start talking 1dB... 1dB is very close to a "just noticeable
difference" in audio levels.. that is, if you have two tones that are
0.5dB apart in level, you'll have a hard time telling the difference
between them. (see, e.g. Weber-Fechner law, etc.)
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