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ＦＸＺ选频系统是采取先确定两通信点之间的最大可用频率ＭＵＦ值，然后在０．８５ＭＵＦ～１．０ＭＵＦ之间寻找最佳频率点。主要介绍选频系统中回波时延值的确定、ＭＵＦ值的确定、频率控制码的形成及其有关的接口电路。
FXZ frequency selection system is to determine the maximum available frequency between the two communication points MUF value, and then find the best frequency between 0.85MUF ~ 1.0MUF. Mainly introduces the selection of echo frequency delay in the system, the determination of MUF value, the formation of frequency control code and its related interface circuits.