frequency signal transmitter
81Coherer — Metal filings coherer The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the twentieth century. Invented around 1890 by French scientist Édouard… …
82Croydon transmitting station — Croydon Height of mast 152 metres (499 ft) Built 1955, 1962 BBC region BBC London ITV region …
83Software-defined radio — A Software Defined Radio (SDR) system is a radio communication system where components that have typically been implemented in hardware (i.e. mixers, filters, amplifiers, modulators/demodulators, detectors. etc.) are instead implemented using… …
84AM broadcasting — is the process of radio broadcasting using amplitude modulation.HistoryAM was the dominant method of broadcasting during the first eighty years of the 20th century and remains widely used into the 21st.AM radio began with the first, experimental… …
85Emergency warning system for vehicles — Telematics technologies are self orientating open network architecture structure of variable programmable intelligent beacons developed for application in the development of intelligent vehicles with target intent to accord (blend, or mesh)… …
86Optical heterodyne detection — is an important special case of heterodyne detection. In heterodyne detection, a signal of interest at some frequency is non linearly mixed with a reference local oscillator (LO) that is set at a close by frequency. The desired outcome is the… …
87Spectrum analyzer — A spectrum analyzer Spectrum analyzer display A spectrum analyzer measures the magnitude of an input signal versus frequency with …
88Rugby transmitting station — NOTOC The Rugby transmitting station was a large very low frequency (VLF) transmission facility near the town of Rugby, Warwickshire in England, situated just west of the A5 trunk road and in later years junction 18 of the M1 motorway. It came… …
89Symbol rate — In digital communications, symbol rate (also known as baud or modulation rate) is the number of symbol changes (waveform changes or signalling events) made to the transmission medium per second using a digitally modulated signal or a line code.… …
90WWVB — For the Virginia based broadcast radio station, please see WWVB FM. WWVB is a special NIST time signal radio station near Fort Collins, Colorado, co located with WWV. WWVB is the station that radio controlled clocks throughout North America use… …
