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CC1120距离问题

Other Parts Discussed in Thread: CC1120, CC1120EM-868-915-RD, CC1190

我这边用的是CC1120 从AVNET那边买的,做一个通话产品,CC1120的配置为 50KBPS,  14db  用的是TI官方的参考原理图,连BOM都是一样的, 用的是868M的磷铜内置弹簧天线,但发射机和接收机的通信距离只有70米这样子,怎么样才能让它达到150米左右, 这个问题困扰差不多一个月了,求支持!!!!!!!!!!!

谢谢!!!!!!!!!!!!!!!!!!