two-wire antenna
41Shortwave listening — (abbreviated as SWLing) is the hobby of tuning for shortwave radio broadcasts located on shortwave frequencies, usually thought of as those from 1700 kHz (the upper limit of the AM broadcasting band) to 30 MHz (the lower limit of the tuning range …
42Wullenweber — AN/FLR 9 Wullenweber antenna array near Augsburg, Germany The Wullenweber (the original name introduced by Dr. Hans Rindfleisch was Wullenwever) is a type of Circularly Disposed Antenna Array (CDAA) sometimes referred to as a Circularly Disposed… …
43Cat's-whisker detector — Galena cat s whisker detector Precision cat s whisker d …
44Numbers 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… …
45Lecher lines — are a form of parallel conductor that can be used at UHF for creating resonant circuits. They are used at frequencies between HF/VHF where lumped components are used, and UHF/SHF where resonant cavities are more practical. Ernst Lecher of Vienna …
46TACAMO — is a U.S. military term meaning Take Charge and Move Out . TACAMO refers to a system of survivable communications links designed to be used in nuclear war to maintain communications between the decision makers (the National Command Authority) and …
47BTR-50 — Infobox Weapon name=BTR 50 caption=Ex Syrian or ex Egyptian BTR 50PK APC in Yad la Shiryon Museum, Israel. 2005. origin=USSR type=Amphibious Tracked Armoured Personnel Carrier is vehicle=yes service=1954 present used by=See Operators. wars=See… …
48Nanosat-1B — A technician is checking a satellite (27 Mar 2009) Operator Instituto Nacional de Técnica Aeroespacial de España Major contractors Universidad de Sevilla Universidad Politécnica de Cataluña AD Telecom ISC Kosmotras Universidad Complutense de… …
49Radio communication system — A radio communication system send signals by radio. [cite book | title = Wireless Network Performance Handbook | author = Clint Smith, Curt Gervelis | year = 2003 | publisher = McGraw Hill Professional | isbn = 0071406557 | url =… …
50Boeing E-4 — E 4B in flight Role …
