radiotelegraphic signal
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signal — Synonyms and related words: ALGOL, COBOL, CRT spot, DM display, Doppler signal, EDP, FORTRAN, IF signal, IM display, RF echoes, Roman candle, Teletype, Wirephoto, aid to navigation, alarm, alert, alphabetic data, alphanumeric code, amber light,… … Moby Thesaurus
telegraphic signal — noun a signal transmitted by telegraphy • Syn: ↑radiotelegraphic signal • Hypernyms: ↑signal, ↑signaling, ↑sign • Hyponyms: ↑dot, ↑dit, ↑d … Useful english dictionary
signaling — noun any nonverbal action or gesture that encodes a message (Freq. 1) signals from the boat suddenly stopped • Syn: ↑signal, ↑sign • Derivationally related forms: ↑sign (for: ↑sign) … Useful english dictionary
telephonic — Synonyms and related words: Teletype, Wirephoto, communication, communicational, communications, facsimile, magnetotelephonic, microtelephonic, monotelephonic, phototelegraphic, radio, radiotelegraphic, signal, telecommunicational, telegraphic,… … Moby Thesaurus
s o s — n. letters which represent the radiotelegraphic signal (... ...) used by ships in distress; any cry for help … English contemporary dictionary
SOS — n. letters which represent the radiotelegraphic signal (... ...) used by ships in distress; any cry for help … English contemporary dictionary
SOS — is the commonly used description for the international Morse code distress signal (· · · · · ·). This distress signal was first adopted by the German government in radio regulations effective April 1, 1905, and became the worldwide standard when… … Wikipedia
500 kHz — Since early in the 20th century, the radio frequency of 500 kilohertz (500 kHz) has been an international calling and distress frequency for Morse code maritime communication. The United States Coast Guard and comparable agencies of other nations … Wikipedia
Invention of radio — Great Radio Controversy redirects here. For the album by the band Tesla, see The Great Radio Controversy. Contents 1 Physics of wireless signalling 2 Theory of electromagnetism … Wikipedia
Radio broadcasting — Long wave radio broadcasting station, Motala, Sweden … Wikipedia
