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  • Anechoic chamber — An anechoic chamber An anechoic chamber (an echoic meaning non echoing or echo free) is a room designed to stop reflections of either sound or electromagnetic waves. They are also insulated from exterior sources of noise. The combination of both… …   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

  • Electromagnetic reverberation chamber — A look inside the (large) Reverberation Chamber at the Otto von Guericke University Magdeburg, Germany. On the left side is the vertical Mode Stirrer (or Tuner), that changes the electromagnetic boundaries to ensure a (statistically) homogeneous… …   Wikipedia

  • Radio transmitter design — In plate modulation systems the voltage delivered to the stage is changed. As the power output available is a function of the supply voltage, the output power is modulated. This can be done using a transformer to alter the anode (plate) voltage.… …   Wikipedia

  • Mobile radio — This article is about professional equipment. For mobile radios used in amateur radio, see amateur radio mobile operation. Mobile radio or mobiles refer to wireless communications systems and devices which are based on radio frequencies, and… …   Wikipedia

  • USS The Sullivans (DD-537) — The first USS The Sullivans (DD 537) is a Fletcher class destroyer. The ship is named in honor of the five Sullivan brothers (George, Francis, Joseph, Madison, and Albert) aged 19 to 27 who lost their lives when their ship, USS Juneau , was sunk… …   Wikipedia

  • Extremely high frequency — Frequency range 30 to 300 GHz ITU Radio Band Numbers 1 2 3 4 5 6 7 8 9 10 …   Wikipedia

  • USS Laffey (DD-724) — For other ships of the same name, see USS Laffey. USS Laffey (DD 724) in 1964 Career (U.S.) …   Wikipedia

  • Channel 4 programming — Channel 4, in common with the other main British stations broadcast on analogue, airs a highly comprehensive range of programming. It was established in 1982 with a specific intention of providing programming to groups of minority interests, not… …   Wikipedia

  • Daryush Shokof — (Persian: داریوش شکوف) (born Ali Reza Shokoufandeh on June 25, 1954) is an Iranian artist, film director, philosopher, writer, art director, and film producer, and singer. He was born in Tehran, Iran, but lives in Germany. Contents 1 Background 2 …   Wikipedia

  • One World Trade Center — Freedom Tower redirects here. For other uses, see Freedom Tower (disambiguation). For the building complex destroyed in the September 11 attacks, see World Trade Center. For the specific WTC building formerly known as One World Trade Center, see… …   Wikipedia

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