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  2. RF modulator - Wikipedia

    en.wikipedia.org/wiki/RF_modulator

    The modulator is then programmed to broadcast the signals on a certain frequency. That RF broadcast is then received by the connected TV. When the TV is tuned to the programmed channel, the video and audio signal of the source device is accessed. RF modulation can become difficult in a CATV system. High pass, low pass, and notch filters must be ...

  3. Sup'R'Mod - Wikipedia

    en.wikipedia.org/wiki/Sup'R'Mod

    The Sup 'R' Mod II kit has a small printed circuit board, an antenna switch, and a coaxial cable with a ferrite core and RCA connectors. Composite video is received by the circuit board through a short cable terminating in a Molex connector, which plugs into a header on the Apple II motherboard. Input can also be provided through an RCA connector.

  4. Cable television headend - Wikipedia

    en.wikipedia.org/wiki/Cable_television_headend

    Analog terrestrial TV signals require a processor which is a RF receiver that outputs video and audio. In some cases the processor will include a built-in modulator. Digital terrestrial TV signals require a special digital processor. Digital channels are usually received on an L band QAM stream from a satellite, which uses multiplexing. Using ...

  5. Tuner (radio) - Wikipedia

    en.wikipedia.org/wiki/Tuner_(radio)

    A television tuner or TV tuner, also called a TV receiver, is a component or subsystem that converts analog television or digital television transmissions into audio and video signals which can be further processed to produce sound and a picture. [29] [30] [31] A TV tuner must filter out unwanted signals and have a high signal-to-noise ratio. [32]

  6. Superheterodyne transmitter - Wikipedia

    en.wikipedia.org/wiki/Superheterodyne_transmitter

    Operators may change the RF output of the transmitter. In direct modulation, it is very difficult to change the RF output. Because in this case, practically all stages need to be retuned for the new RF. On the other hand, in superheterodyne only the output stages need to be retuned.

  7. Intermediate-frequency amplifier - Wikipedia

    en.wikipedia.org/wiki/Intermediate-frequency...

    IF amplifiers in heterodyne receivers apply gain in a frequency band between the input radio frequency and output audio frequency or video frequency, often following one stage of RF amplifier. This allows most of the gain in the form of a fixed-frequency amplifier, simplifying tuning. Compare to its predecessor, the tuned RF receiver.

  8. Modulating retro-reflector - Wikipedia

    en.wikipedia.org/wiki/Modulating_retro-reflector

    A modulating retro-reflector (MRR) system combines an optical retro-reflector and an optical modulator to allow optical communications [1] and sometimes other functions such as programmable signage. [2] Free space optical communication technology has emerged in recent years as an attractive alternative to the conventional radio frequency (RF

  9. Television transmitter - Wikipedia

    en.wikipedia.org/wiki/Television_transmitter

    A television transmitter is a transmitter that is used for terrestrial (over-the-air) television broadcasting.It is an electronic device that radiates radio waves that carry a video signal representing moving images, along with a synchronized audio channel, which is received by television receivers ('televisions' or 'TVs') belonging to a public audience, which display the image on a screen.

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