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radio direction finding net

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  • Amateur radio direction finding — Sport imagesize = 250px caption = A German competitor on a two meter ARDF course. union = International Amateur Radio Union nickname = first = 1950s, in northern and eastern Europe registered = clubs = contact = Non contact team = Individual… …   Wikipedia

  • Radio — 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… …   Wikipedia

  • Radio Orienteering in a Compact Area — is a variation of Amateur Radio Direction Finding. ROCA is a timed race in which individual competitors use a topographic map and a magnetic compass to navigate through diverse, wooded terrain while searching for radio transmitters.… …   Wikipedia

  • Amateur radio in India — Infobox amateur radio country country=India caption=Amateur radio operators at a foxhunt in Mumbai licensed=16,000 license year=1913 itu region=3 itu zone1=41 itu zone2=49 cq zone1=22 cq zone2=26 itu rep=WPC iaru rep=ARSI callsign1=VUA to VWZ… …   Wikipedia

  • Amateur radio — Amateur radio, often called ham radio, is both a hobby and a service in which participants, called hams, use various types of radio communications equipment to communicate with other radio amateurs for public service, recreation and self training …   Wikipedia

  • Signals intelligence operational platforms by nation — This article is a subset article under the main article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with current signals… …   Wikipedia

  • Signals intelligence in modern history — This article is a subset article of the article Signals intelligence, which addresses the unifying conceptual and technical factors and common technologies in this intelligence discipline. This article deals with signals intelligence in the… …   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

  • Signals intelligence — SIGINT redirects here. For the UNIX signal, see SIGINT (POSIX). RAF Menwith Hill, a large site in the United Kingdom, part of ECHELON and the UK USA Security Agreement. Signals intelligence (often contracted to SIGINT) is intelligence gathering… …   Wikipedia

  • Numbers station — Fictional example of a numbers station. Numbers stations (or number stations) are shortwave radio stations of uncertain origin. In the 1950s, Time magazine reported that the numbers stations first appeared shortly after World War II and were… …   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

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