从 PSK调制器20输出的连续波在延迟电路26I和延迟电路26Q中被延迟， 然后作为参考信号提供给接收混频器30的每个混频器。

The continuous wave output from the PSK modulator 20 is delayed in delay circuits 26I and 26Q and is then supplied, as a reference signal, to each of mixers of a receiving mixer 30.

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混频器的变频损耗和噪声温度的测量可以用改变中频部分的噪声温度使接收机的系统噪声温度变化来加以确定。

The conversion loss and noise temperature of mixers is determined by changing the IF noise temperature so as to change the noise temperature of the receiver system.

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在现代通信系统中，毫米波频段通常采用超外差接收机，混频器作为第一级就成为关键部件。

The super-heterodyne receiver is always applied in modern communication system, mixer becomes the key component as is at the first part of system.

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