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and the operator, using "Morse Code" simply used the key to interrupt a continuous transmission into "dits" and "dahs".
Over the years, CW has lost much popularity, although many still practice this mode of communications and it is widely held that when all else fails, CW will still get through. Since it uses very little bandwidth and due to its nature, CW can be "pulled out of the mud" when nothing else can be deciphered.
Not truly a digital mode, since it isn't binary, CW is still considered to be digital by many.
Beginner's Guide to making contacts with CW: