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cc1110传输距离太近?

Other Parts Discussed in Thread: CC1101

做一个低功耗的433MHz无线测温项目,选择的发送芯片是cc1110,接受芯片是处理器加cc1101,实际测量过程中发现通讯距离还短了,完全达不到设计要求!!!距离大概也就30米左右的样子,请问专家们是怎么回事呢,是不是我在这个项目中选择的芯片有问题呢?测试条件是这样的:在空旷的大车间里,车间两头大概是50米的样子,无线模块放在桌子上,桌子大概50cm高度。芯片参数是:250kbps,安装ti推荐的高速参数设置的。天线:天线是网上买的3db增益的棒状天线。