Beyond line of sight communication

Japanese: 見通し外通信 - みとおしがいつうしん

While normal microwave communications have no obstacles between the transmitting and receiving points and are mutually line of sight, microwave radio is used between points where line of sight cannot be obtained due to the long distance between the transmitting and receiving points and the effects of the spherical surface of the earth and mountain ranges, etc. It requires a large antenna with a reflector area of 100 to several hundred m2, a high-output transmitter of several kW to 10 kW, and a low-noise diversity receiver, but because of the large propagation loss along the way, it is limited to low-capacity communications with 120 or fewer telephone lines or low-quality television signal transmission.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

通常のマイクロ波通信が送信点と受信点との間に障害物がなく相互に見通しがあるのに対して，送受信点間が遠距離のため，地表面が球面である影響や山岳などにより見通しの得られない地点間で用いられる通信をいう。100～数百m2の反射鏡面積を有する大型アンテナ，数kWから10kW程度の大出力送信機，低雑音のダイバーシティ受信機などを必要とするが，途中の伝搬損失が大きいため，電話回線数にして120以下の小容量通信または低品質のテレビジョン信号伝送などに限られる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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