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一、前言在超短波无线电通讯电台中,如果采用锁相式频合器,频率间隔为25kHz,则频合器中的可变程序分频器有两个矛盾要解决。一是程序分频器的分频比对应的BCD码与频率预置码不一致,如用频率预置BCD码直接去预置分频比,就要进行一些变化;二是程序分频器要满足高速工作要求。我们设计了一个用在频率间隔为25kHz、工作频率为
I. INTRODUCTION In the UHF radio communication station, if the phase locked frequency synthesizer is used and the frequency interval is 25 kHz, there are two contradictions in the variable program frequency divider in the frequency synthesizer. First, the program divider ratio corresponding to the BCD code and the frequency preset code is not consistent, such as the frequency preset BCD code directly to the preset frequency ratio, it is necessary to make some changes; Second, the program divider to meet High-speed work requirements. We designed a used at a frequency interval of 25kHz, the operating frequency is