测试收发包结果如下，发包的功率是4.5dB，但是接受是-83dB，接受与发送设备之间只隔了1米远，为什么有这么大的衰减？
另外关于Received Not OK这项数据是如何得来的呢，是指接收到了空中报文但是报文是错误的，还是指丢包？
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