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介绍了 ＧＭＳＫ调制解调芯片 ＦＸ ９０９的特点及其在无线高速 ＭＯＤＥＭ中的应用，并给出了相应的硬件框图和主程序流程图。该 ＭＯＤＥＭ可通过音频接口与调频话音电台相接，同时也可与具有标准 ＲＳ－ ２３２ Ｃ接口的数据设备相接，从而通过传统话音电台实现数据信号的无线传输。
The characteristics of GMSK modem chip FX 909 and its application in wireless high-speed MODEM are introduced, and the corresponding hardware block diagram and main program flow chart are given. The MODEM interfaces to FM voice stations over the audio interface and also to data equipment with a standard RS-232 C interface for wireless transmission of data signals over conventional voice stations.