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本文讨论了中波广播多频（ 二频或三频） 共塔发射时天线底部预调网络的计算机设计问题。通过对等阻条件的分析， 文中给出了解决二频问题的一元二次方程及解决三频问题的二元二次方程组，并用Ｊａｃｏｂｉ 矩阵的方法求解。通过编制相应的Ｃ语言程序，实现对预调网络参数的自动计算。最后详细介绍了应用该软件设计、调试二频共塔和三频共塔预调网络的两个实例。
This paper discusses the computer design of the antenna presets in the mid-wave broadcasting multi-frequency (two-frequency or three-frequency) common-tower transmission. Through the analysis of equal resistance conditions, the paper presents a quadratic quadratic equation for solving the bifocal problem and a binary quadratic system for solving the tri-frequency problem, and then uses Jacobi matrix method to solve the problem. Through the preparation of the corresponding C language program, to achieve pre-tune network parameters automatically calculated. Finally, two examples of application of the software design, debugging two-frequency common tower and three-frequency common tower pre-setting network are introduced in detail.