Information AboutTuner (radio) |
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A tuner is an adjustable device which passes one Radio Frequency , or Band of frequencies, and excludes others, by using electrical Resonance . The simplest tuner consists of an Inductor and Capacitor . Combined with a Detector , also known as a Demodulator , it becomes the simplest Radio Receiver , often called a Crystal Set . Tuners can be either Stereo or Mono , and are available for TV , FM , and AM signals. Typically, AM and FM tuners are sold with built-in Amplifier s and/or Loudspeaker s, and this device is referred to as a Receiver . However, standalone stereo FM tuners are sought after for Audiophile and TV/FM DX applications, especially those produced in the 1970s, when standards of quality were higher before Plastic replaced Metal . A few 1970s tuners feature now-deprecated Dolby Noise Reduction for FM broadcasts. TV tuners are rarely found as a separate component. They are usually bundled with a Monitor , VCR , and/or PVR . However, they do exist for use by members of the television industry, and may be purchased on EBay . TV tuners are also installed on PCI Computer Expansion Cards (or in USB device, or even as a part of Video Card ), together with a DSP , allowing a Personal Computer to diaplay and/or capture television channels. A number of earlier models were stand-alone tuners, designed to deliver TV picture through a VGA Connector . This allowed viewing television on a computer display, but, of course, did not allow recording programmes by the PC. See TV Tuner Card for more information about computer-designed TV tuners. TRANSMITTING TUNER Another type of radio tuner allows a transmitter to be efficiently operated with Antennas and transmission lines that are not matched in Impedance . Such a tuner is useful when operating an antenna system over a wide range of frequencies. SEE ALSO EXTERNAL LINKS
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