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Shortwave bands are frequency allocations for use within the shortwave radio spectrum (the upper medium frequency [MF] band and all of the high frequency [HF] band). Radio waves in these frequency ranges can be used for very long distance (transcontinental) communication because they can reflect off layers of charged particles in the ionosphere and return to Earth beyond the horizon, a ...
Grundig Satellit 400 solid-state, digital shortwave receiver, c. 1986 [1]. Shortwave radio is radio transmission using radio frequencies in the shortwave bands (SW). There is no official definition of the band range, but it always includes all of the high frequency band (HF), which extends from 3 to 30 MHz (approximately 100 to 10 metres in wavelength).
Transmitted via Lahti radio station from 1938 to 1948, Pori shortwave station from 1948 to 1987 and finally then new Pori's shortwave center in Preiviiki district from 1987 to the end of 2006. Known before early 1970s as shortwave service of Finnish Broadcasting Company. Scandinavian Weekend Radio: 2000 Yes France Radio France Internationale ...
CBS used shortwave to support its Latin American international network, which consisted of 64 stations located in 18 countries and GE's KGEI opened in San Francisco in 1939, transmitting to Asia. [16] [17] [18] On November 1, 1942, all 14 private U.S. shortwave stations ended commercial operations and were leased to the Voice of America. [19]
Frequency (MHz) Program Transmitter site Time, UTC Days Language Power (kW) Az Remarks 3.965 Radio France Internationale (DRM) Issoudun 01:00-00:57 1234567 French (Digital) 1 ND RFI 3.975 6160 Shortwave AM Radio Winsen 16:00-18:00 .234567 English 1 ND 3.985 SRF Schweizer Radio Kall-Krekel 16:00-17:00 1234567 German 1 ND 3.995 HCJB Deutsch
Radios for shortwave reception generally have higher performance than those intended for the local mediumwave, longwave or FM broadcast band, since dependable reception of shortwave signals requires a radio with increased sensitivity, selectivity, dynamic range and frequency stability. Modern shortwave radio receivers are relatively inexpensive ...
The World Administrative Radio Conference (WARC) bands are three portions of the shortwave radio spectrum used by licensed and/or certified amateur radio operators. They consist of 30 meters (10.1–10.15 MHz), 17 meters (18.068–18.168 MHz), and 12 meters (24.89–24.99 MHz).
Radio waves are defined by the ITU as: "electromagnetic waves of frequencies arbitrarily lower than 3000 GHz, propagated in space without artificial guide". [5] At the high frequency end the radio spectrum is bounded by the infrared band. The boundary between radio waves and infrared waves is defined at different frequencies in different ...
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