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The Majestic Model #71 introduced in 1927, for example, was a tuned radio frequency receiver with a 9-inch (23 cm) speaker, powered from AC house current. [10] This was a considerable improvement over previous radios having typically poor selectivity and producing inferior sound from old-fashioned horn speakers or earphones.
The signal is received by the repeater from the originating radio and re-broadcast so the receiving radio(s) can receive the radio signal. A repeater site gives approximately a 50-mile radius of coverage. Trunk ed radio is a method of using a bank of channels (frequencies) to repeat for multiple "Talk Groups" or fleet of radios.
English: Broadcasting (radiocommunication) service (ITU RR, article: 1.38), here: principle transmission diagram of sound broadcasting AM And FM. Русский: Радиовещание (МСЭ Регламент радиосвязи, статья 1.38) cхема передачи и приёма радиосигнала АМ и ЧМ.
Logic Trunked Radio (LTR) is a radio system developed in the late 1970s by the E. F. Johnson Company. [1] LTR is distinguished from some other common trunked radio systems in that it does not have a dedicated control channel. LTR systems are limited to 20 channels (repeaters) per site and each site stands alone (not linked).
English: Block diagram of a tuned radio frequency (TRF) receiver, a type of radio receiver circuit invented in 1916 by Ernst Alexanderson and widely used in the vacuum tube receivers of the 1920s.
[24] [25] [26] Introduced in the year 2000, the radio was known for its "all-in-one" functionality. It can transmit on all amateur radio bands between 160 meters and 70 centimeters, with the exception of the 1.25 meters band, and the "X" model also has built-in 23 centimeters band capability option. Kenwood discontinued production of the TS ...
In radio-frequency engineering and communications engineering, a waveguide is a hollow metal pipe used to carry radio waves. [1] This type of waveguide is used as a transmission line mostly at microwave frequencies, for such purposes as connecting microwave transmitters and receivers to their antennas, in equipment such as microwave ovens, radar sets, satellite communications, and microwave ...