I did this analysis for CW signals several years ago, but it should
still be valid. I called it the "minimal discernible difference". It
doesn't show how many QSOs an extra dB or two will give you, but it does
give a fairly decent indication for the effect on copy. The method I
used to create the files is described as well.
http://www.ab7e.com/weak_signal/mdd.html
The Cliff Notes version is that my conclusion is that 1 dB can make a
marginal difference, and 2 dB will make a noticeable one. It would be
fairly simple for someone to use that same methodology to generate
similar files with a much larger number of callsigns, and anyone could
then determine the effect of a dB or two on the percentage of copied
callsigns.
I think it is also noteworthy to check out the effect of code speed on
intelligibility in weak signal (relative to the noise level) situations.
73,
Dave AB7E
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