一种带内移频系统、无线传输中继系统及一种移频直放站

In-band frequency shifter system, radio transmission relaying system and frequency shifting directly releasing station

Abstract

本实用新型提供了一种带内移频系统,该系统包括至少一个信号处理模块,所述信号处理模块包括:混频器、中频放大器、中频滤波器、振荡器、温补晶振;晶振作为振荡源为第一振荡器、第二振荡器提供振荡信号,第一振荡器用于为第一混频器提供第一本振频率;第一混频器将第一本振频率与接收的第一射频信号相加/相减后得到中频频率发送至第一中频放大器;被第一中频放大器放大的信号经带宽中频滤波器滤波后;被发送至第二中频放大器;第二中频放大器将放大后的信号发送至第二混频器,与第二振荡器第二本振频率的振荡信号相加/相减输出预置工作频带内的第二射频信号。
The utility model provides a system with inner frequency shift, which comprises at least one signal processing module, the signal processing module comprises a frequency mixer, a intermediate frequency amplifier, a intermediate frequency filter, a oscillator, and a Temperature Compensation Crystal Oscillator. The crystal oscillator is the oscillation source to provide oscillation signal for the first oscillator and the second oscillator; the first oscillator is used to provide first local oscillation frequency for the first frequency mixer. The first frequency mixer adds the first local oscillation frequency and received radiofrequency signal together/ makes them subtract each other and sends the obtained intermediate frequency to the first intermediate frequency amplifier; the signal is amplified by the first intermediate frequency amplifier and sent to the intermediate frequency filter through bandwidth; after being filtered by the intermediate frequency filter then is sent to the second intermediate frequency amplifier. The second intermediate frequency amplifier sends the amplified signal to the second frequency mixer, and is added together / subtracted with the oscillation signal of the second local oscillation frequency of the second oscillator then emit the second radiofrequency signal in the preset work frequency band.

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