high-frequency direction finding
111Navigation — This article is about determination of position and direction on or above the surface of the earth. For other uses, see Navigation (disambiguation). Table of geography, hydrography, and navigation, from the 1728 Cyclopaedia. Navigation is the… …
112Superheterodyne receiver — A 5 tube superheterodyne receiver made in Japan around 1955 In electronics, a superheterodyne receiver (sometimes shortened to superhet) uses frequency mixing or heterodyning to convert a received signal to a fixed intermediate frequency, which… …
113Non-directional beacon — Radio Tower of NKR Leimen Ochsenbach, Germany This symbol denotes an NDB on an aeronaut …
114Media and Publishing — ▪ 2007 Introduction The Frankfurt Book Fair enjoyed a record number of exhibitors, and the distribution of free newspapers surged. TV broadcasters experimented with ways of engaging their audience via the Internet; mobile TV grew; magazine… …
115technology, history of — Introduction the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …
116Amateur 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 …
117Microwave oven — A modern microwave oven …
118Chain Home — Radar Coverage 1939 1940 Chain Home was the codename for the ring of coastal Early Warning radar stations built by the British before and during the Second World War. The system otherwise known as AMES Type 1 (Air Ministry Experimental Station)… …
119140th Military Intelligence Battalion (United States) — Infobox Military Unit unit name= 140th Military Intelligence Battalion (Combat Electronic Warfare Intelligence) (Heavy Division) caption=140th Military Intelligence Battalion distinctive unit insignia dates=1986 1995 country= United States… …
120The Blitz — London Blitz redirects here. For the London based American football team, see London Blitz (American football). For other uses, see Blitz (disambiguation). The Blitz Part of Second World War, Home Front …
