Repeater - Chukei-ki (English spelling)

Japanese: 中継器 - ちゅうけいき（英語表記）repeater

When sending telecommunication signals over long distances, amplifiers placed along the way are called repeaters. When transmitting information signals over cable or radio waves, the signal attenuates and weakens as the distance increases, so repeaters are inserted along the way to amplify the signal. Coaxial cables, which are widely used for long-distance communication, are repeated every 1.5 to 3 km, while microwave signals are repeated approximately every 50 km.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

遠距離に電気通信信号を送る場合，途中に置く増幅器を中継器という。ケーブルや無線電波で情報信号を伝送するとき，距離が長くなると信号が減衰して弱まるので，途中に中継器を入れて増幅する。長距離の通信に広く用いられる同軸ケーブルでは 1.5～3kmごとに，マイクロ波では約 50kmごとに中継される。

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