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An antenna tuning hut or helix house is a small shed at the base of a longwave or mediumwave radio transmitting antenna. It contains antenna tuner — radio equipment for coupling the power from the feedline to the antenna. [1] Alternative names include antenna tuning house, coupling hut, and dog house.
Omnidirectional radiation patterns are produced by the simplest practical antennas, monopole and dipole antennas, consisting of one or two straight rod conductors on a common axis. Antenna gain (G) is defined as antenna efficiency (e) multiplied by antenna directivity (D) which is expressed mathematically as: =.
An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), antenna coupler, or feedline coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna's feedline. Antenna tuners are particularly important for use with ...
The J-pole antenna is an end-fed omnidirectional half-wave antenna that is matched to the feedline by a shorted quarter-wave parallel transmission line stub. [5] [1] [6] For a transmitting antenna to operate efficiently, absorbing all the power provided by its feedline, the antenna must be impedance matched to the line; it must have a resistance equal to the feedline's characteristic impedance.
A tuner is also a standalone home audio product, component, or device called an AM/FM tuner or a stereo tuner that is part of a hi-fi or stereo system, or a TV tuner for television broadcasts. The verb tuning in radio contexts means adjusting the receiver to detect the desired radio signal carrier frequency that a particular radio station uses.
The principle has been adopted in some high-end FM tuners like the analog Burmester Tuner 915 (1991) [19] or the digital synthesizer tuners Onkyo [nb 3] Integra T-4970 (1992) [16] [2] [3] and T-488F (1993) [15] [20] as well as in various car radios, such as the Alpine 7619R (1989) and 1310R/3681 (1990), [17] the JVC KS-CG10 (1992), [4] the ...
This article provides a summary description of many of the different antenna types used for radio receiving or transmitting systems. This summary article collects groups of antennas based on their electrical operation. The classification and sub-classifications below follow those typically used in most antenna engineering textbooks. [1] [2] [3 ...
Dockyard Review - The Journal of the Advanced Starship Design Bureau Volume 2 - Issue 3: John Barnard, Alan Jenkins, Adelaide Kylami, Interlagos Catalunya 1999 .pdf 15 8.5" x 11" The 24th Century Technical Manual - Special Edition #1: Christopher Simmons 1989 (Staple) 64 8.5" x 11" The 24th Century Technical Manual - Special Edition #2