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433M通讯问题

Other Parts Discussed in Thread: CC1101

发射方:CC1110,天线为板载天线,可编程发射功率为10db时,实测发射功率为6~7db,频偏为:40khz

接收方:CC1101,天线为外置3db增益天线;

频段:433M

参数配置如下:

测试结果:

     1、0db的发射功率通讯距离达到80m左右,5db的只有70m左右,10db的也才100米左右;

     2、接收灵敏度到-80db就开始出现乱码和丢包,超过-90db就收不到数据包了;

问题:

     1、10db的通讯距离才100m,是否太近?

     2、0db的发射功率通讯距离比5db的要好,和10db差不多,这是为什么?