A damped wave is an electromagnetic wave whose amplitude of oscillation decreases with time, eventually going to zero. This term also refers to an early method of radio transmission from spark gap transmitters, or other types of transmitters having characteristic decrement similar to spark transmitters, in which a carrier wave is switched on and off. This is generally referred to as "Class B" emission. Information is carried in the rhythm and spacing with which the signal is sent. Damped waves were used for a form of on-off keying (OOK). However, such transmitters were noisy and generated a wide emission bandwidth.
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