I think this is exactly what your looking for:
 
http://ossmann.com/bh-usa-08/usrp_replay_cfile.py



Zetek Stuff wrote:
> 
> Hello,
> I am using USRP to do some testing with some walkie talkies. I am
> recording
> the samples from the walkie talkie using usrp_rx_cfile.py python script. I
> then
> want to take that file (I/Q) samples into MATLAB, do some DSP in MATLAB
> and retransmit those IQ samples at the same RF frequency. I'm wondering
> if there's an existing Python script to transmit these I/Q samples on the
> USRP
> from this file input?
> Thanks in advance.
> 
> 
> 
>       
> _______________________________________________
> Discuss-gnuradio mailing list
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> 
> 

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