- spark telegraphy
- 火花电报
English-Chinese electron industry dictionary (英汉电子工程大词典). 2013.
spark telegraphy
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Telegraphy — (from the Greek words (τηλε) = far and (γραφειν) = write) is the long distance transmission of written messages without physical transport of letters. Radiotelegraphy or wireless telegraphy transmits messages using radio. Telegraphy includes… … Wikipedia
Spark-gap transmitter — A spark gap transmitter is a device for generating radio frequency electromagnetic waves. These devices served as the transmitters for most wireless telegraphy systems for the first three decades of radio (1887 ndash;1916) and the first… … Wikipedia
spark coil — noun an induction coil used to create sparks • Hypernyms: ↑induction coil • Part Holonyms: ↑ignition, ↑ignition system * * * noun : an induction coil for producing the spark for an internal combustion engine * * * Elect. a coil of many turns of… … Useful english dictionary
Wireless telegraphy — The term Wireless Telegraphy is a historic term used today as applied to early radio telegraph communications techniques and practices. Wireless telegraphy originated as a term to describe electrical signaling without the electric wires to… … Wikipedia
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
CQ (call) — CQ is a code used by wireless operators, particularly those communicating in Morse code, but also by voice operators, to make a general call (called a CQ call ). Transmitting the letters CQ on a particular radio frequency is an invitation for any … Wikipedia
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Guglielmo Marconi — Born 25 April 1874(1874 04 25) Palazzo Marescalchi, Bologna … Wikipedia
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Timeline of radio — The timeline of radio lists within the history of radio, the technology and events that produced instruments that use radio waves and activities that people undertook. Later, the history is dominated by programming and contents, which is closer… … Wikipedia
