由于月球阻碍了与探测器的直接无线电通信，中国首先必须把一颗人造卫星送入月球轨道上的一个点，人造卫星可以从那里向航天器和地球发射信号。
Because the moon's body blocks direct radio communication with a probe, China first had to put a satellite in orbit above the moon in a spot where it could send signals to the spacecraft and to Earth.
这颗卫星上装有无线电收发设备和电源，可对信号接收、处理、放大后再发射，从而大大提高了通信质量。
Telstar is launched as the first "active" communications satellite—active as in amplifying and retransmitting incoming signals, rather than passively bouncing them back to Earth.
在现代无线通信系统中，对发射信号进行直接射频调制已成为射频无线电的发展趋势。
In modern wireless communication system, the direct RF-modulation for transmitting signal is a new developing trend of RF radio.
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