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Jan 30, 2022 at 12:24 comment added Antonio51 Bi-directional amplifiers are often used in a variety of systems. Tv communities distribution with wire uses these amplifiers widely. Even in the "optical" domain. This is possible by some "circulator" functions, widely used in Very high frequencies. But these functions can also be realized at very lower frequencies (phone line is one).
Jan 30, 2022 at 11:40 answer added SteveSh timeline score: 1
Jan 30, 2022 at 10:38 answer added Klas-Kenny timeline score: 1
Jan 30, 2022 at 9:44 history asked icyli2 CC BY-SA 4.0