cannot receive signal from channel 1 using example of niUSRP multiple Synchronized Output (MIMO Expansion)

[Agimma90]

Hi everyone. I need some help regarding receiving using USRP N210 for Multiple Output (MIMO Expansion)

I actually try run the example from niUSRP EX TX Multiple Synchronized Outputs (MIMO Expansion).

When I try to receive the signal, i only receive signal transmitted from channel 0 as attached in the figure here (MIMO Receiver).

I did not modify the block diagram.

I use USRP N210 to transmit and receive.

Does anyone know why is it so? Is it because the antenna? I am