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rotatable directional antenna

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  • Antenna (radio) — Whip antenna on car …   Wikipedia

  • HRS antenna — HRS type antennas are more or less the standard antenna used for long distance high power shortwave broadcasting (> 1000 km). Contents 1 History of HRS design 2 Nomenclature 3 A versatile antenna type …   Wikipedia

  • Loop antenna — A shortwave loop antenna A loop antenna is a radio antenna consisting of a loop (or loops) of wire, tubing, or other electrical conductor with its ends connected to a balanced transmission line. Within this physical description there are two very …   Wikipedia

  • History of radar — The history of radar starts with experiments by Heinrich Hertz in the late 19th century that showed that radio waves were reflected by metallic objects. This possibility was suggested in James Clerk Maxwell s seminal work on electromagnetism.… …   Wikipedia

  • Radio direction finder — Civil Air Patrol members practice using a handheld radio direction finder to locate an emergency locator transmitter …   Wikipedia

  • HRS type antennas — are more or less the standard antenna used for long distance high power shortwave broadcasting (> 1000 km). History of HRS design HRS antennas were discovered during the 1920s, and as such were not originally intended for voice and music… …   Wikipedia

  • Direction finding — (DF) refers to the establishment of the direction from which a received signal was transmitted. This can refer to radio or other forms of wireless communication. By combining the direction information from two or more suitably spaced receivers… …   Wikipedia

  • 15-meter band — In telecommunications, 15 meters is a shortwave radio band used by amateur radio operators. The band is located at 21 MHz, and almost all countries permit amateur radio activity on the entire band. The 15 meter band was opened to amateurs in the… …   Wikipedia

  • ALLISS — Disambiguation * Financial Instruments: The Alliss Grant a US Financial Aid instrument, see [http://www.lsc.cc.mn.us/FinancialAid/allissGrant.cfm] [http://www.mnscu.edu/students/specialprograms/alliss.html] . * People: Peter Alliss (UK golfer and …   Wikipedia

  • Shortwave relay station — A shortwave relay station typically consists of a transmitter building (or transmitter hall) and one or more HRS type antennas. Some relay stations (that operate at 100 kW or less) that only serve a local region (within 1500 km) may use Log… …   Wikipedia

  • OLPC XO-1 — XO 1 Manufacturer Quanta Computer Media 1 GB flash memory Operating system …   Wikipedia

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