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CC1310: 433Mhz双向通讯问题

Part Number: CC1310

在使用SmartRF Studio 7进行通讯时,TX固定发送,RX由近到远进行通讯测试,通讯距离可以到600m。到此极限时,将RX改成TX,TX改成RX,进行距离测试,稳定通讯只有200m。这是什么原因呢?是什么参数设置不合适吗?