Hi all, I have been testing USRP and Gnu Radio for a while and it's been a very interesting, educational experience. One of the important things for me is to get capture to / playback from file capability to work. I simplified usrp_rx_cfile.py a bit and essentially what my script does is: usrp.source_c --> gr.head --> gr.file_sink It produces huge files (with complex samples, I understand) which I intend to "play" back through LFTX daughterboard. So, another script does something like: gr.file_source (gr.sizeof_complex, fname,true) \-----> usrp.sink_c (0, interp) \-----> fftsink2.fft_sink_c Gain on the LFTX is set to -1.02 dB - as read by self.u.pga(0). The problem is that I don’t get any signal from LFTX although I can see the expected spectrum in the FFT window (which is connected in parallel to the same stream). The signal is digital radio transmission with estimated S/N around 40 dB. Since the spectrum matches what I had seen when tuning the radio with some receiver script which also provided FFT window, I assume data stream is OK. Just to check my hardware I tried usrp_siggen.py and checked the outputs of LFTX with an oscilloscope. I could see the expected sine wave nicely phase shifted by pi/2. Hardware is OK, but somehow my “playback” script doesn’t want to push data out. Do you have any suggestions? Thanks, Peter
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