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艾德温？阿姆斯特朗开发接收机电路—超外差式收音机。Edwin armstrong develops a receiving circuit-the superheterodyne.

功率分析仪和频谱分析仪都本质上都是超外差接收机。Both an RF power analyzer and a spectrum analyzer are essentially specialized superheterodyne receivers.

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接收机采用两次变频超外差式结构设计，第一中频为高中频。The high-intermediate-frequency superheterodyne structure with twice conversions is adopted in the final scheme.

本文首先指出了超外差接收机的固有缺点，即它有更多的虚假响应。This paper first discusses the instinct disadvantage of a superheterodyne receiver, which is that it has more spurious response.

并以超外差接收机的工作原理为例，说明了虚拟实验教学的特点和作用。In this paper, a superheterodyne receiver is taken as an example to illustrate the characteristic and effect of virtual experiment teaching.

在分析研究各种接收机结构的基础上，论文提出了基于超外差接收机的解决方案。According to the research and analysis of structure in several receivers, this paper brings forward a solution based on the superheterodyne receiver.

微带交指带通滤波器具有结构紧凑、易于批量生产的特点，适用于TVRO超外差接收机中作为镜像频率抑制滤波器。Microstrip interdigital band-pass filters are compact and easy for batch manufacturing. They are suitable for applications in TVRO superheterodyne receivers as image-reject filters.

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分别讨论了在理想假设和实际情况下超外差接收机的双边带噪声系数和单边带噪声系数，给出了单边带接收机的某些设计方案。This paper discussed the double sideband noise figures and single side band noise figures of the superheterodyne receivers in a ideal hypothesis and the practical case respectively.

系统中发射器采用编码器编码后发送超高频信号，接收器采用二次混频型超外差式接收移动目标信号。The system uses the emitter to send ultra high frequency signals after coding with signal coder and the secondary superheterodyne mixing receiver to accept the moving target signals.

本文结合超外差频谱分析仪的基本原理对制约其下限频率的因素进行了全面分析，并针对零频响应这一主要因素简要介绍了零频对消技术的原理。Based on the fundamental of superheterodyne spectrum analyzers, this paper comprehensively analyzes the factors, which restrict the frequency range that an analyzer can operate down to.

最后指出对于宽开接收机而言，抑制或减少虚假响应是设计超外差接收机的重要任务之一。Finally, it points out that, as far as wide open receiver is concerned, to suppress or reduce the spurious response is one of the most important tasks in designing a superheterodyne receiver.

针对专用移动移动通信对接收机的要求，分析了TETRA协议中基站接收机技术指标和选择双中频超外差接收机方案。Aiming at request of private mobile radio, technology requirement of base station receiver based on TETRA protocol is analyzed, and two intermediate frequency superheterodyne structure is selected.