http://forum.mikrotik.com/t/increase-recieve-sensitivity/10821/6 (2007-01-04 18:37:36)
Not, not clearer, just louder. Assume that you are trying to listen to some music on your stereo, but in the next room some construction workers are using heavy tools that make so much noise that they are almost as loud as the music from your stereo. You will not be able to hear the music clearly, because the difference between the volume of the noise and the music does not allow you to differentiate the music clearly from the noise. It’s the difference in volume that makes the music distinguishable from the noise. If both the music and the noise were to gain the same amount in volume the mix of music and noise would just be a lot louder overall, but you will still not be able to better differentiate the music from the noise despite the fact that the db value of the music has increased. That is what your AMP does: it makes the music and the noise louder, and both equally so. The relative difference between them (SNR - signal to noise ratio) remains the same.