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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 ...
Modulator and antenna switch The Sup 'R' Mod II is an RF modulator which was sold by M&R Enterprises in the late 1970s and early 1980s. It connects computers and other devices with composite video outputs, to a television.
RF modulator, composite video, RGB monitor output, 160×256 (4 or 16 colours), 320×256 (2 or 4 colours), 640×256 (2 colours), 320×200 (2 colours – spaced display with two blank horizontal lines following every 8 pixel lines), 640×200 (2 colours – spaced display) Graphics: Ferranti Semiconductor Custom ULA: Sound: Tone and noise ...
A pixel graphics mode is by default not available, but can be implemented by the user. Relevant instructions were published in various magazines and books until early 1990s. The monochrome image is fed to a built-in RF modulator and then transmitted through the coaxial antenna port for use by standard TV; an upgrade to color output is possible.
There are a number of RF amplifier tubes that operate in a similar fashion to the TWT, known collectively as velocity-modulated tubes. The best known example is the klystron. All of these tubes use the same basic "bunching" of electrons to provide the amplification process, and differ largely in what process causes the velocity modulation to occur.
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
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The prior art includes an RF MEMS frequency tunable fractal antenna for the 0.1–6 GHz frequency range, [18] and the actual integration of RF MEMS switches on a self-similar Sierpinski gasket antenna to increase its number of resonant frequencies, extending its range to 8 GHz, 14 GHz and 25 GHz, [19] [20] an RF MEMS radiation pattern ...
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