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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 ...
From the 1920s until the 1960s, most tuners used a vacuum tube-based design. Manufacturing shifted to solid state electronics in the 1960s, but this didn't always result in improved sound quality compared to the older tube tuners. [11] [12] The radiogram, which combined a gramophone with a radio, was a predecessor of the hi-fi tuner. [13]
The single triode vacuum tube amplifies the radio signal, then also amplifies the audio modulation signal extracted from it by the detector. A reflex radio receiver , occasionally called a reflectional receiver , is a radio receiver design in which the same amplifier is used to amplify the high-frequency radio signal (RF) and low-frequency ...
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.
For example, in TV and radio broadcasting, information flows only from the transmitter site to multiple receivers. A pair of walkie-talkie two-way radios provide a simplex circuit in the ITU sense; only one party at a time can talk, while the other listens until it can hear an opportunity to transmit. The transmission medium (the radio signal ...
The antenna may be enclosed inside the receiver's case, as with the ferrite loop antennas of AM radios and the flat inverted F antenna of cell phones; attached to the outside of the receiver, as with whip antennas used on FM radios, or mounted separately and connected to the receiver by a cable, as with rooftop television antennas and satellite ...
Antenna tuner, an adjustable device that matches the impedance at the end of a transmission line to an antenna or a radio ATSC tuner , a device that receives digital television broadcasts Tuner (radio) , a module or device which separates out one channel from low-amplitude radio-frequency signals for further processing or output, such as AM, FM ...
[1] [2] With internal battery pack, on board keyer, its all mode/all band capability and flexible antenna, the set is particularly well suited for portable use. The FT-817 is based on a similar circuit architecture as Yaesu's FT-857 and FT-897, so it is a compromise transceiver and incorporates its features to its low price ($670.- at its 2001 ...
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