frequency signal transmitter
111omnirange — /ˈɒmnireɪndʒ/ (say omneeraynj) adjective a radionavigation system in which a pilot can select any position relative to a high frequency ground transmitter, whose signal can be used to help plot course or position …
112FMCW — Frequency Modulated Continuous wave radar (FM CW) is a radar system where a known stable frequency continuous wave radio energy is modulated by a triangular modulation signal so that it varies gradually and then mixes with the signal reflected… …
113Letter beacon — Signal of letter beacon D on 5137.5 kHz Letter beacons are radio transmissions of uncertain origin, which consist of only a single repeating Morse Code letter. They are also often referred to as: SLB, or Single Letter Beacons SLHFB, or… …
114History 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.… …
115radar — /ray dahr/, n. 1. Electronics. a device for determining the presence and location of an object by measuring the time for the echo of a radio wave to return from it and the direction from which it returns. 2. a means or sense of awareness or… …
116telecommunications media — Introduction equipment and systems metal wire, terrestrial and satellite radio, and optical fibre employed in the transmission of electromagnetic signals. Transmission media and the problem of signal degradation Every… …
117Antenna (radio) — Whip antenna on car …
118Signals 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… …
119telephone — telephoner, n. /tel euh fohn /, n., v., telephoned, telephoning. n. 1. an apparatus, system, or process for transmission of sound or speech to a distant point, esp. by an electric device. v.t. 2. to speak to or summon (a person) by telephone. 3.… …
120Digital Audio Broadcasting — For other digital audio broadcasting systems, see Digital radio.   Countries with regular services …
