1.前言本文叙述了连接在计数器输入端之前的分频器的应用。目的是使频率范围扩展到1.5吉赫。2.外差变频器外差变频器可使测量的频率达到20吉赫。这种方法是将微波输入信号和已知频率的高稳定外差振荡器的信号相混合,从而产生一个在 1. Introduction This document describes the application of a divider connected before the counter input. The goal is to extend the frequency range to 1.5 GHz. 2. Heterodyne frequency converter Heterodyne frequency converter can measure the frequency of 20 GHz. This method is the microwave input signal and known frequency of high stability heterodyne oscillator signal mixing, resulting in a