On Tue, Jan 08, 2008 at 04:10:46PM +0100, [EMAIL PROTECTED] wrote: > Hi, > I've observed that all URB allocated in the Tx side are correctly proccesed. > For example: > Data -> 25 Byte (from a mpg file) > Total payload -> 80 Byte (Data + CRC + Padding + Header + ....) > > Total Byte to transfer with a BPSK modulator -> 80 * 8 (bit of a char) * 6 > (sample per symbol) * 4 (Byte - IQ) -> 15360 Byte (multiple of 512 Byte). > > All URB buffers used are multiple of 512. > In fusb_ephandle_linux::submit_urb (fusb_linux.cc) i have inserted > wait_for_completion () function from which I get these massages: URB list empy > (All request). > > I transmit such packets every 1 - 2 seconds (no stream data). But I can't see > them on the Rx side using usrp_fft.py to observe the signal on the air. I can > see some signal only occasionally. Is this problem reconducted to the Host PC > side (maybe the Linux USB driver)?
The tx side seems OK. usrp_fft doesn't (normally) process all incoming data, since it can't keep up. From your description, it looks like you are trying to detect a very small burst sent once every 1 or 2 seconds. Try logging the rx samples to disk using usrp_rx_cfile.py and then examine the file using octave. Eric _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
