以下为句子列表：
英文: Function test and calibration self-heterodyne curve for direction finder on sea trial.
中文: 航行试验中测向仪效用试验及自差曲线校正。
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英文: If two FM signals are on the same frequency at the same time, there will still be a heterodyne or beat note (unless one is 6 dB stronger than the other).
中文: 通常商业电台会滤掉这些亚音频，但我们的业余电台并不进行过滤，所以我们可能能听到这个频率的音频。
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英文: Virtually all receivers in use today employ Armstrong's super heterodyne concept.
中文: 实际上所有接收器在使用中今天使用阿姆斯壮的超级外差概念。
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英文: In this paper, the noise equivalant power (NEP) of optical heterodyne system has been measured with a method based on acousto-optici germanium' crystal modulator working at Bragg diffraction mode as a frequency shifting device in heterodyne system.
中文: 本文介绍了利用工作于Bragg衍射的Ge晶体声光调制器作为外差系统中的频移器来测量外差系统的噪声等效功率(NEP)的方法。
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