Transmitting I and Q signal

Hi,

I was trying to transmit I and Q signal at 2.4GHz using:
gr.file_source(complex)
-> usrp.sink_c
and recieve them on another USRP board. But I do not recieve anything at
the
2.4GHz. I got the I and Q signals using the usrp_rx_cfile.py.

I have tried the binary file obtained from usrp_rx_cfile.py to be the
source
file. I extracted the I and Q values from the binary file into a .dat
file
in the complex form (x+iy) and also just as floats (like ‘x y’, where x
is
real and y is img) and tried to transmit it. In any case, I do not
recieve
anything on the other USRP setup. What should be source file format for:
gr.file_source(complex) -> usrp.sink_c ?

Thanks
Meenaktchi