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EM34 tuning eye EM84 tuning indicator. A magic eye tube or tuning indicator, in technical literature called an electron-ray indicator tube, [1] is a vacuum tube which gives a visual indication of the amplitude of an electronic signal, such as an audio output, radio-frequency signal strength, or other functions. [1]
Frequency drift was a problem in early (or inexpensive) receivers; inadequate selectivity may affect any tuner. A wideband FM signal can also be used to carry a stereo signal; this is done with multiplexing and demultiplexing before and after the FM process. The FM modulation and demodulation process is identical in stereo and monaural processes.
Marantz 2050L AM/FM stereo tuner (USA; 1978-1980) [1]. In electronics and radio, a tuner is a type of receiver subsystem that receives RF transmissions, such as AM or FM broadcasts, and converts the selected carrier frequency into a form suitable for further processing or output, such as to an amplifier or loudspeaker.
The most important advantage is that better selectivity can be achieved by doing the filtering at the lower intermediate frequency. [9] [12] [14] One of the most important parameters of a receiver is its bandwidth, the band of frequencies it accepts. In order to reject nearby interfering stations or noise, a narrow bandwidth is required.
The three leaded devices depicted at the top of the page are generally two common cathode connected varicaps in a single package. In the consumer AM/FM tuner depicted at the right, a single dual-package varicap diode adjusts both the passband of the tank circuit (the main station selector), and the local oscillator with a single varicap for ...
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 ...
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The galena detector, the most widely used type among amateurs, [4] became virtually the only detector used in crystal radios from this point on. [21] [22] The carborundum junction saw some use as a detector in early vacuum tube radios because it was more sensitive than the triode grid-leak detector. Crystal radios were kept as emergency backup ...
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