组成通信系统的基本要素包括发信机，通道以及收信机。
The elements of a telecommunication system are a transmitter, a medium (line) and possibly a channel imposed upon the medium (see baseband and broadband as well as multiplexing), and a receiver.
我使用自制的发信机，输出15w，收信机是239型，这是中国制造的军用品。
I'm using a homebrew transmitter which is running 15 watts, the type of my receiver is 239used by military in China.
卫星0.7米段的发信机天线是左旋圆极化，2米段收信机是1/4波长鞭状天线。
The 70cm transmitter antenna configuration is Left Hand Circular polarity (LHCP). The 2M receiving antenna is a 1/4 wave whip.
给出了传统形式下的手动测试和自动测试平台的比较，并建立了收信机参考灵敏度指标的自动测试平台。
I will give the difference between manual radio communication test and automatic test platform. In the paper an example of reference sensitivity tested by automatic test platform will be given.
本文特别指出，在小信噪比输入的条件下，非相干解调器的“门限效应”严重恶化，甚至使收信机无法工作。
It is emphasized that under some poor SNR conditions, the "threshold effect" of non-coherent demodulator degrades seriously, even causes the receiver to be out of work.
本文特别指出，在小信噪比输入的条件下，非相干解调器的“门限效应”严重恶化，甚至使收信机无法工作。
It is emphasized that under some poor SNR conditions, the "threshold effect" of non-coherent demodulator degrades seriously, even causes the receiver to be out of work.
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