shortwave communication

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• shortwave radio — a radio that transmits or receives shortwaves. * * * ▪ communications       transmission and reception of information by means of electromagnetic waves about 10 to 80 m (33 to 262 feet) in length having frequencies of approximately 29.7 to 3.5… …   Universalium

• Shortwave radio — Shortwave can also refer to a shortwave trough meteorology. A solid state, analog shortwave receiver Shortwave radio refers to the upper MF (medium frequency) and all of the HF (high frequency) portion of the radio spectrum, between… …   Wikipedia

• Shortwave — radio operates between the frequencies of 3,000 kHz (3.000 MHz) and 30,000 kHz (30.000 MHz) [ Tomislav Stimac, [http://www.vlf.it/frequency/bands.html Definition of frequency bands (VLF, ELF... etc.)] . IK1QFK Home Page (vlf.it).] and came to be… …   Wikipedia

• Shortwave listening — (abbreviated as SWLing) is the hobby of tuning for shortwave radio broadcasts located on shortwave frequencies, usually thought of as those from 1700 kHz (the upper limit of the AM broadcasting band) to 30 MHz (the lower limit of the tuning range …   Wikipedia

• Shortwave bands — are frequency allocations for use within the high frequency radio spectrum. They are the primary medium for applications such as marine communication, international broadcasting, and worldwide amateur radio activity because they take advantage of …   Wikipedia

• Communication with submarines — is difficult because radio waves do not travel well through thick electrical conductors like salt water. The obvious solution is to surface and raise an antenna above the water, then use ordinary radio transmissions. Early submarines had to… …   Wikipedia

• communication — I (New American Roget s College Thesaurus) Act of communicating ideas Nouns 1. communication, intercourse, conversation, speech, writing, correspondence; message, tidings, news(see information). 2. communicator, messenger, nuncio; herald, crier,… …   English dictionary for students

• Power line communication — or power line carrier (PLC), also known as power line digital subscriber line (PDSL), mains communication, power line telecom (PLT), power line networking (PLN), or broadband over power lines (BPL) are systems for carrying data on a conductor… …   Wikipedia

• Development communication — Development Communication, has been alternatively defined as a type of marketing and public opinion research that is used specifically to develop effective communication or as the use of communication to promote social development. Defined as the …   Wikipedia

• satellite communication — Introduction  in telecommunication, the use of artificial satellites to provide communications links between various points on Earth (Earth satellite). Communications satellites relay voice, video, and data signals between widely separated fixed… …   Universalium

• Marconi, Guglielmo — born April 25, 1874, Bologna, Italy died July 20, 1937, Rome Italian physicist and inventor. He began experimenting with radio waves in 1894. In 1896 he went to England, where he developed a successful system of radio telegraphy. His work on the… …   Universalium