Al Klein wrote:
You can hear the change in noise as a carrier goes on and off. It's
extremely difficult to copy high speed CW like that if the signal is
strong, but a weak signal or slower CW is just as easy to copy as
noise as it is to copy as a pure tone. T1 doesn't mean uncopyable, it
just means ragged tone.

So now amateurs and SWL's should be Morse code proficient
not only using tones but using the swishing sound made when
a BFO is not present?
--
73, Cecil http://www.qsl.net/w5dxp