Modulated continuous wave
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Modulated continuous wave (MCW) is Morse code telegraphy transmitted using an audio tone to modulate a carrier wave.
Continuous wave (CW), by contrast, does not use a subcarrier, so there is no emission at all between Morse code symbols.
MCW can be generated by any AM or FM radio transmitter with audio input from an audio oscillator or equivalent audio source.[1][2] When an SSB transmitter is modulated by Morse code of only a single audio frequency, the resulting radio frequency emission is J2A or J2B and therefore is CW by definition, not MCW.[3]