CW

From HFUnderground

Stands for Continuous Wave, another way of saying that the station is transmitting morse code. This mode is still used in certain Military organizations (like the Russian AF) as well as amateur radio communications.

Emission designator for true CW is N0N. Morse code telegraphy (actual tone) is A1A. Modulated CW (MCW) transmitted over an AM or FM voice radio channel is sometimes called "MCW" or "tone-modulated". Emission designators for Morse code modulated over AM is A3A, Morse code over FM is F3A. Morse code over a phase-modulated signal is G3A emission.