1) Radiotelegraph 
• (n.) Telegraphy using the radiant energy of electrical (Hertzian) waves; wireless telegraphy; -- the term adopted for use by the Radiotelegraphic Convention of 1912.
radio communication by means of Morse Code or other coded signals. The radio carrier is modulated by changing its amplitude, frequency, or phase in ... [4 related articles]
telegraphy using radio transmission channels on all or part of its route NOTE - The term 'radiotelegraphy' is mainly used in the absence of multiplexing.
Ra`di·o·te·leg'ra·phy noun [ Radio- + telegraphy .] Telegraphy using the radiant energy of electrical (Hertzian) waves; wireless telegraphy; -- the term adopted for use by the Radiotelegraphic Convention of 1912.