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All CW emission types (not MCW), listed by the FCC (all are one channel): Double-sideband amplitude modulation, no subcarrier (A1A, A1B) Vestigial sideband, no subcarrier (C1A, C1B) Single-sideband modulation with full carrier, no subcarrier (H1A, H1B) Single-sideband with suppressed carrier, no subcarrier (J1A, J1B)
In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently.
These silent periods provide the sending operator with opportunities to listen for interruptions from receiving stations. Whereas in usual CW operation the sending carrier wave is always on, and only gated to the antenna, in QSK operation the antenna is switched to receiver status on the off-time between dits and dahs, and then switched right back.
Signalling by keying the carrier directly, a.k.a. continuous wave (CW) or on–off keying, currently used in amateur radio. This is often but not necessarily Morse code. A2A Signalling by transmitting a modulated tone with a carrier, so that it can easily be heard using an ordinary AM receiver.
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Most amateur digital modes are transmitted by inserting audio into the microphone input of a radio and using an analog scheme, such as amplitude modulation (AM), frequency modulation (FM), or single-sideband modulation (SSB). Amateur teleprinting over radio (AMTOR) D-STAR (Digital Data) a high speed (128 kbit/s), data-only mode.