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实测了RF模块的RSSI值， 低频点的RSSI值明显比高频点差，是什么原因造成的呢？
要看天线实际辐射的中心频点，一般越靠近中心频点，信号就会越强，离中心频点越远，信号会差一些
低频点的RSSI值明显比高频点差，是什么原因造成的呢？