Problem of reception using CC1101 demo board

Hi,

I have problem with CC1101 SmartRF04EB Evaluation board.Using Smartrf Studio I am configuring one Evaluation board as TX and the another one as RX,using Smartrf Studio software I am sending packets from TX but the receiver(RX) is not receiving packets and I tried vice versa also by puting the other board on receive mode then also it is not receiving packets.I also tried by downloading the software examples Link,Link1 into the MCU in demo board using smartrf studio then also there is problem of reception for transmission it works well it is transmitting packets but receiver is receiving nothing.

So there is some problem with receiving packets.

Thank You