signal in morse (code)
111Modulated continuous wave — Passband modulation v · d · e Analog modulation AM · …
112Flag — A flag is a piece of cloth, often flown from a pole or mast, generally used symbolically for signaling or identification. The term flag is also used to refer to the graphic design employed by a flag, or to its depiction in another medium.The… …
113Universal asynchronous receiver/transmitter — A universal asynchronous receiver/transmitter (usually abbreviated UART and pronEng|ˈjuːɑrt) is a type of asynchronous receiver/transmitter , a piece of computer hardware that translates data between parallel and serial forms. UARTs are commonly… …
114CQD — CQD, transmitted in Morse code as · · · · · is believed to be the first distress signal adopted for radio use. It was announced on January 7, 1904, by [http://www.earlyradiohistory.us/1913dist.htm Circular 57 ] of the Marconi International Marine …
115Non-directional beacon — Radio Tower of NKR Leimen Ochsenbach, Germany This symbol denotes an NDB on an aeronaut …
116Station identification — (sometimes called a sounder or stinger ) is the practice of any type of radio or television station or network identifying itself, typically with a call sign or brand name. Over the air transmitters may be required to identify themselves… …
117Contesting — Champions of the 2002 World Radiosport Team Championship (WRTC), Helsinki, Finland. Photo: R. A. Wilson, N6TV Contesting (also known as radiosport) is a competitive activity pursued by amateur radio operators. In a contest, an amateur radio… …
118Radio — is the transmission of signals, by modulation of electromagnetic waves with frequencies below those of visible light.Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air and the vacuum of… …
119Civil defense siren — Federal Signal Thunderbolt 1003 Civil Defense siren. A civil defense siren (also referred to as an air raid siren, tornado siren, tsunami siren, fire siren/whistle, flood siren, weather siren, time/curfew siren, or other outdoor warning siren) is …
120Walkie-talkie — A walkie talkie (more formally known as a handheld transceiver) is a hand held, portable, two way radio transceiver. Originally developed for the Canadian government during the Second World War by Canadian Donald L. Hings, similar designs were… …
