Many years ago, as weak-signal 2 meter CW was becoming popular,
a chap (I forget his name/call) could copy a signal 2 db below the
noise level. This was confirmed by testing him, and seemed to be
the record at the time.
> >The reason is noise power is directly related to filter bandwidth, and
> >CW is a very narrow mode. The brain, if trained properly, makes a
> >good CW filter. The brain can discriminate against off-frequency
> >noise as long as it has some type of frequency difference.
> >If you restrict noise and signal to a very narrow BW, it gets tough
> >to "filter" in your head because it all sounds the same.
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