1) Radio modulation mode
Found on
https://www.crosswordclues.com/clue/damped-wave
A damped wave is a wave whose amplitude of oscillation decreases with time, eventually going to zero. This term also refers to an early method of radio transmission produced by spark gap transmitters, which consisted of a series of damped electromagnetic waves. Information was carried on this signal by telegraphy, turning the transmitter on and of...
Found on
http://en.wikipedia.org/wiki/Damped_wave
No exact match found.
