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CC2530 不能入网有哪些原因?

Other Parts Discussed in Thread: CC2530

CC2530,倒F PCB天线 ,烧录GenericAPP,用2531 USB dongle抓到rssi -56dbm。无法入网,只有靠的非常近,rssi达到-45dbm以上,才能可靠入网。

跟datasheet上-90dbm差别巨大。硬件检查多遍,未见问题,加屏蔽罩,也未见改善。改为外接天线,结果还是一样。电源全部换成低噪声LDO,锂电池供电,也不见改善。没招了,请问不能入网都有哪些原因?该从哪些方面检查?