The transmission medium for a digital channel can be opticalcable, digital microwave link and satellite circuit, etc.

数字信道的传输媒体可以是光缆、数字微波、卫星信道等各种手段。

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In fact, a four - wire circuit can be established without the use of any wires at all, as in the case with a circuit established over microwave, satellite, or infrared transmission systems.

事实上，可以不使用任何线来建立四线电路，例如通过微波、卫星或红外传输系统。

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Therefore, analyzing the transmission of satellite communication and utilizing information encoding and decoding circuit are the key to reduce wrong code in transmission.

因此分析卫星信息的传送及利用信息编解码电路，是减少信息传送中出现错码的关键。

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This meant the circuit board would be edge-on to the sky, the worst position to pick up the satellite signals needed to determine its position.

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