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在跳频通信中,接收的跳频载波序列若与本地产生的跳频序列图案一致,则经混频后可得到一个固定的中频信号,再经解调获得输出。利用多个频率轮流双向传输多个信息,每个信息轮流分时使用这些工作频率,这样在达到抗干扰效果的同时可以提高频谱的利用率。介绍了一种VHF跳频电台的功能设计方法,并对其中的发射模块进行了详细的介绍,说明了电路的组成与工作原理,该发射模块可以产生一个精确的被锁定在主要参考频率上的14.5 MHz的已调制中频信号。
In frequency hopping communication, if the received frequency hopping carrier sequence is consistent with the locally generated frequency hopping sequence pattern, a fixed intermediate frequency signal may be obtained after being mixed and then demodulated to obtain the output. Use multiple frequencies in turn to transmit multiple messages in turn. Each message uses these operating frequencies in a time-sharing manner, which improves the spectrum utilization while achieving anti-interference effects. A functional design method of VHF frequency hopping radio is introduced and the transmitting module in it is described in detail. The circuit composition and working principle are described. The transmitting module can generate a precise locked frequency reference signal 14.5 MHz modulated IF signal.