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An antenna is a sensory organ found on the head of insects.
 Research Antenna
Gall-fly is a name for several hymenopterous insects of the family Cynipidae, which form galls, each species preferring a different plant. The gall is due to an irritating fluid which the insect deposits on the plant along with its egg. The large galls at the base of oak leaves are produced by the Cynips quercus baccarum, a fly of a brown colour, with blade antenna, chestnut-brown legs, and white wings. The small galls on the under surface of oak leaves are due to another species, Cynips quercus folii, those on the stems of oaks to Cynips terminalis.
Research Gall-fly
Mysidacea is an order of crustaceans of the sub-class Malacostraca in which the thorax is covered by the carapace and the exopodite of the antenna is scale-like. The abdomen terminates in a tail fan.
Research Mysidacea
The whip-scorpion is a group of Arachnida of the order Pedipalpi, resembling the spider in having a narrow wait between the fore-part and the abdomen, but differing in having no silk glands. The second pair of limbs are modified as powerful grasping organs armed with spines for impaling their prey and the first pair of legs are turned into antenna-like feelers, resembling long whips in some kinds.
Research Whip-scorpion
Karl Ferdinand Braun was a German physicist who made improvements to Guglielmo Marconi's system of wireless telegraphy. He was born in 1850 at Fulda, and died in 1918. He and Marconi shared the 1909 Nobel Prize for Physics. Braun also discovered crystal rectifiers (used in early radios), and invented the oscilloscope in 1895. He was educated at Marburg and Berlin. He held academic posts at a number of German universities, ending his career as professor and from 1895 director of the Institute of Physics at Strasbourg. In an attempt to increase the radio transmitter range to more than 15 km, Braun devised a system in which the power from the transmitter was magnetically coupled (using electromagnetic induction) to the antenna circuit. He patented this invention in 1899, and the principle of magnetic coupling has since been applied to all similar transmission systems. Later Braun developed directional antennas. In 1874 Braun discovered that some mineral metal sulphides conduct electricity in one direction only. These were later used in the crystal radio receivers that preceded valve circuits. Braun's oscilloscope was an adaptation of the cathode-ray tube. A laboratory instrument to study high-frequency alternating currents, it was the forerunner of television and radar display tubes.
Research Karl Braun
The OpTex MICRADC (miniature radio colour camera) is a miniature TV transmitter designed to provide a link using the MPT1349 UK license exempt frequency band with an effective radiated power level not greater than 100mW. The MICRADC is aimed at investigative journalism or work of a covert nature. The radio camera provides a simple plug-in link requiring no operator intervention. The six volt dc power supply to the transmitter is via a SMC miniature connector and on the receiver a miniature two pin Lemo connector. Located next to this is a BNC socket for video input/output. The unit is supplied as standard with a short whip antenna which should achieve a link range of about 150 to 300 metres.
Research MICRADIC
The standing wave ratio (SWR) is the ratio of power sent down a feed line from the transmitter to the power reflected back through the feed line to the transmitter. A ratio of 1:1 is considered ideal; anything higher than 2:1 usually indicates a problem in the impedance matching of the feed line or antenna.
Research Standing Wave Ratio
The Grumman E-2A Hawkeye is an American airborne early warning, surface surveillance and strike control aircraft version of the Grumman G-123, first flown in 1966 (the original Grumman E-2 first flew in 1960). The E-2A Hawkeye is powered by two Allison T56-A-8 turboprop engines providing a top speed of 478 kmh and an endurance of seven hours flying time. The Grumman E2A Hawkeye carries a flight crew of two and an Airborne Tactical Data System team of three in independent operating stations. The Grumman E-2A Hawkeye carries the AN/APA-164 rotordome antenna and is equipped with an AN/APS-111 radar.
Research Grumman E-2A
AAAS is an abbreviation for American Association for the Advancement of Science
AAAS is an abbreviation for Advanced Aircraft Armament System
AAAS is an abbreviation for Aural Aided Acquisition Signal
AAAS is an abbreviation for Automated Antenna Alignment System
Research AAAS
AAC is an abbreviation for Alaskan Air Command
AAC is an abbreviation for Aeronautical Advisory Council
AAC is an abbreviation for Agricultural Advisory Council
AAC is an abbreviation for Amateur Athletic Club
AAC is an abbreviation for Anno Ante Christum
AAC is an abbreviation for Army Air Corps
AAC is an abbreviation for Adaptive Antenna Control
AAC is an abbreviation for Alaskan Air Command
AAC is an abbreviation for Automatic Amplitude Control
AAC is an abbreviation for Advanced Audio Coding
Research AAC
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The Probert Encyclopaedia was designed, edited and programed by
Matt and Leela Probert
©1993 - 2009 The Probert Encyclopaedia
Southampton, United Kingdom
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