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- Damped_wave abstract "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 off (on-off keying) to send messages in Morse code. Damped waves were the first practical means of radio communication, used during the wireless telegraphy era which ended around 1920. In radio engineering it is now generally referred to as "Class B" emission. However, such transmissions have a wide bandwidth and generate electrical "noise" (electromagnetic interference) which interferes with other radio transmissions.Because of their potential to cause interference and their resulting wasteful use of radio spectrum resources, there is an international prohibition against the use of class B damped wave radio emissions, established by the International Telecommunications Union in 1938. However the definition of "damped waves" in these regulations is unclear when applied to modern technology, and recently there have been moves to amend this prohibition to exempt emerging radio technologies such as ultra-wideband transmission systems.".
- Damped_wave thumbnail Ondes_amorties.jpg?width=300.
- Damped_wave wikiPageExternalLink 47cfr2.201.htm.
- Damped_wave wikiPageExternalLink sparkmakers2.html.
- Damped_wave wikiPageID "4326611".
- Damped_wave wikiPageRevisionID "544313712".
- Damped_wave hasPhotoCollection Damped_wave.
- Damped_wave subject Category:Radio_modulation_modes.
- Damped_wave type Abstraction100002137.
- Damped_wave type Attribute100024264.
- Damped_wave type Manner104928903.
- Damped_wave type Property104916342.
- Damped_wave type RadioModulationModes.
- Damped_wave comment "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 off (on-off keying) to send messages in Morse code.".
- Damped_wave label "Damped wave".
- Damped_wave label "Gedämpfte Welle".
- Damped_wave label "Onda smorzata".
- Damped_wave label "Oscillations amorties".
- Damped_wave sameAs Gedämpfte_Welle.
- Damped_wave sameAs Oscillations_amorties.
- Damped_wave sameAs Onda_smorzata.
- Damped_wave sameAs m.0bx96m.
- Damped_wave sameAs Q3813807.
- Damped_wave sameAs Q3813807.
- Damped_wave sameAs Damped_wave.
- Damped_wave wasDerivedFrom Damped_wave?oldid=544313712.
- Damped_wave depiction Ondes_amorties.jpg.
- Damped_wave isPrimaryTopicOf Damped_wave.