To facilitate realistic testing, the heart of real is the radio frequency attenuation network, a system designed to simulate realistic field conditions for multiple radios.

为方便实际测试，REAL实验室的核心是射频衰减网络，可模拟多个无线电的真实部署。

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Propagation characteristic of UHF radio wave in rectangle, circle and arched tunnels is studied in this paper and the computing equation for attenuation constant is deduced.

研究UHF频段的无线电波在矩形、圆形和拱形隧道中的传播特性，推导了衰减常数的计算公式。

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Evaporation ducts, or tropospheric ducts in general, can guide radio waves to distances far beyond the horizon with less attenuation, and then severely impair some certain radio wave system.

以蒸发波导为代表的对流层大气波导传播，可使电波在较小的衰减下沿波导传播得很远，从而严重影响合适的无线电系统。

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