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Additional
Continuous wave
English Wikipedia - The Free Encyclopedia
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Continuous wave
A
continuous wave
or
continuous waveform
(
CW
) is an
electromagnetic wave
of constant
amplitude
and
frequency
; and in
mathematical analysis
, of infinite duration. Continuous wave is also the name given to an early method of
radio
transmission
, in which a
carrier wave
is switched on and off.
Information
is carried in the varying duration of the
on and off periods
of the signal, for example by
Morse code
in early radio. In early
wireless telegraphy
radio transmission, CW waves were also known as "undamped waves", to distinguish this method from
damped wave
transmission.
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