continuous wave

[kən¦tin·yə·wəs ′wāv] (electromagnetism) A radio or radar wave whose successive sinusoidal oscillations are identical under steady-state conditions. Abbreviated CW. Also known as type A wave.

continuous wave

(communications)(CW) A term from early radio history, whenthe spark gap method of transmission was replaced byvacuum-tube oscillators. A spark gap initiates a ringing,damped sinusoidal wave in a tuned circuit consisting of aninductor and capacitor. The energy in this circuit isconstantly changing between the capacitor's electrostaticfield and the inductor's magnetic field. The energy is thencoupled, loosely (so as not to dampen the wave too quickly),to the radiating antenna.

In contrast, a vacuum-tube oscillator constantly adds energyto the tuned circuit, compensating for the amount coupled tothe antenna, and the transmitted energy or "wave," istherefore "continuous".

Many (especially radio amateurs) continue to understand "CW"to mean transmission by means a signal of a single frequencywhich is either on or off (e.g. Morse code), as opposed to acarrier which varies continuously in amplitude, frequency orphase. Some would even call the former "unmodulated" eventhough turning on and off is actually an extreme form ofamplitude modulation.

单词	continuous wave
释义	continuous wave continuous wave also con·tin·u·ous-wave (kən-tĭn′yo͞o-əs-wāv′)adj. Emitting or capable of emitting continuously; not pulsed: a continuous wave laser; continuous wave radar. continuous wave continuous wave [kən¦tin·yə·wəs ′wāv] (electromagnetism) A radio or radar wave whose successive sinusoidal oscillations are identical under steady-state conditions. Abbreviated CW. Also known as type A wave. continuous wave (communications)(CW) A term from early radio history, whenthe spark gap method of transmission was replaced byvacuum-tube oscillators. A spark gap initiates a ringing,damped sinusoidal wave in a tuned circuit consisting of aninductor and capacitor. The energy in this circuit isconstantly changing between the capacitor's electrostaticfield and the inductor's magnetic field. The energy is thencoupled, loosely (so as not to dampen the wave too quickly),to the radiating antenna. In contrast, a vacuum-tube oscillator constantly adds energyto the tuned circuit, compensating for the amount coupled tothe antenna, and the transmitted energy or "wave," istherefore "continuous". Many (especially radio amateurs) continue to understand "CW"to mean transmission by means a signal of a single frequencywhich is either on or off (e.g. Morse code), as opposed to acarrier which varies continuously in amplitude, frequency orphase. Some would even call the former "unmodulated" eventhough turning on and off is actually an extreme form ofamplitude modulation. MedicalSeecwAcronymsSeecold war
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