| slovo | definícia |
continuous wave
(czen) | Continuous Wave,CW[zkr.] [voj.] Zdeněk Brož a automatický překlad |
continuous wave
(foldoc) | continuous wave
CW
(CW) A term from early radio history
for a transmitter using an electron tube (valve) oscillator
to constantly add energy to a tuned circuit connected to an
antenna.
The term is used in contrast with the use of a spark gap to
initiate a damped sinusoidal wave in a tuned circuit consisting
of an inductor and capacitor. The energy in this circuit
constantly changes between the capacitor's electrostatic field
and the inductor's magnetic field. The energy is then coupled
to the radiating antenna, loosely (so as not to dampen the wave
too quickly).
Some radio amateurs understand "CW" to mean transmission by
means a single frequency signal which is either on or off
(e.g. Morse code), as opposed to a carrier which varies
continuously in amplitude, frequency or phase. Some would
even call the former "unmodulated" even though turning on and
off is actually the most extreme form of amplitude modulation.
(2009-11-24)
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