The intent of these tests is good. It is always good
to get confirmation that a 2 dB difference in S/N
is significant. That's why I run 150W in low power
contests instead of 100W, if the rules permit.
There is some question as to the validity of your
experiments. It sounds like you added perfect audio
tones to receiver background noise. This isn't
necessarily equivalent to actually receiving signals
through the receiver. The receiver could have some
nonlinearity and the receive filter could have some
ringing.
Rick N6RK
David Gilbert wrote:
>
> I've added a page to my web site covering some investigations into how
> much difference in signal strength might be noticeable in weak signal
> and/or contest conditions, with several audio files included as
> illustration. Please don't consider any of it to be authoritative since
> I am not an audio professional, but maybe some of it will be useful to
> someone. If anyone has suggestions for different comparisons, please
> let me know.
>
> http://www.ab7e.com/weak_signal/mdd.html
>
> 73,
> Dave AB7E
>
>
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