CW: Difference between revisions
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A continuous wave is an electromagnetic wave of constant amplitude and frequency, a pure carrier, and information is carried by turning the wave on and off. [[Morse code]] is often transmitted using CW (on-off keying). | |||
The term originally referred to the absence of modulation during the time when the carrier is 'on'; while a [[spark gap transmitter]] would modulate the signal based on the spark frequency, the 'on' time in a CW signal contains carrier only as one pure and continuous single-frequency waveform. | |||
See: | See: | ||
Revision as of 21:16, 15 April 2009
A continuous wave is an electromagnetic wave of constant amplitude and frequency, a pure carrier, and information is carried by turning the wave on and off. Morse code is often transmitted using CW (on-off keying).
The term originally referred to the absence of modulation during the time when the carrier is 'on'; while a spark gap transmitter would modulate the signal based on the spark frequency, the 'on' time in a CW signal contains carrier only as one pure and continuous single-frequency waveform.
See:
| Modes of operation | |
| Modes | CW * AM * FM * SSB * Digital * Echolink * Emission Classification * IRLP * Optical communications |
| Packet | APRS * D-Star |
| SSTV and ATV | SSTV frequencies * SSTV Modes |