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天线不匹配，比如用的不是433MHz的天线，射频延长线的长度设计不对都会导致通信距离减小。
CC1101是一个收发芯片，如果每颗芯片都要实现收发，在发射效果不受影响的前提下，只能使用双天线。接收天线搞成不匹配的天线就好了。
CC1101有一个衰减寄存器。可以增加一些衰减在接收端。FIFOTHR 【5.6】
CLOSE_IN_RX [1:0] 0 (00) R/W For more details, please see DN010 [11]
Setting RX Attenuation, Typical Values
0 (00) 0dB
1 (01) 6dB
2 (10) 12dB
3 (11) 18dB
