论文部分内容阅读
在采用窄频带调频的小功率晶体管发射机中,直接对晶体振荡器进行频率调制是有一定实际意义的。下面叙述的是我们采用了的一个电路的简要分析与实验情况。我们所采用的电路的高频原理电路如图1所示。振荡回路上并的变容二极管是用来进行频率调制的(变容二极管的反向偏置变化,变容二极管呈现的电容即变化,从而改变振荡器的振荡频率以实现调频)。晶体管发射极电路中串联接入的晶体与LC并联回路是用来控制
In the narrow-band frequency modulation of small power transistor transmitter, directly to the crystal oscillator frequency modulation has some practical significance. Described below is a brief analysis of our circuit and experimental conditions. We use the circuit of high-frequency circuit shown in Figure 1. The varactor diodes on the tank are used for frequency modulation (the reverse bias of the varactor changes as the varactor exhibits a capacitance that changes the oscillator’s frequency for FM). Transistor emitter circuit connected in series with the crystal LC parallel circuit is used to control