Before revision: Overview In continuous wave (CW) radio transmission, also called radiotelegraphy ] or on-off keying and designated by the International Telecommunication Union as emission type A1A , information is transmitted by pulses of unmodulated radio carrier wave which spell out text messages in Morse code.
After revision: Overview In continuous wave (CW) radio transmission, also called radiotelegraphy ] or on-off keying and designated by the International Telecommunication Union as emission type A1H, orWireless Telegraphy (W/T) , information is transmitted by pulses of unmodulated radio carrier wave which spell out text messages in Morse code.