Hi fellows We are trying to transmit and receive train of square wave over wireless using RFX 2400. We modified the usrp_siggen.py file accordingly to generate square wave. We used
./usrp_siggen.py -f 2450M -w 100000 Is the value with -f option correct? We assume that -f option refers to center frequency at antenna but in an <a href=" http://lists.gnu.org/archive/html/discuss-gnuradio/2006-07/msg00097.html";> earlier post </a> it was mentioned that it is the DUC frequency. Which one is correct? On the receiver side, we used usrp_rx_cfile.py script to write the received signal samples on a file. The received signal does not look like a square wave rather a sinusoid. In some cases, the sinusoid appears to be as harmonic of the square wave, sometimes as a modulated sinusoid. If anyone knows the cause and solution for this problem, please guide us. 1. Are we missing anything here? Without communicating with USRP, we made sure that gr_sig_source_c.cc (underlying function that usrp_siggen.py calls) generates a square wave. 2. Do we need to do anything with the USRP tune function? Can we specify the IF frequency at the transmitter and receiver explicitly? 3. Or we cannot transmit/receive square wave through GNU radio. We understand that may be some filters on the usrp board or daughter board will not allow high frequency signals that will distort the corners of the square wave but getting only a sinusoid does not seem right.... 4. Our ultimate interest is not in square wave. For our purpose, we need to generate a shortest possible pulse, say Gaussian pulse, transmit it over the air and implement some ranging algorithms. We started with square wave and got stuck. Any help/ideas will be highly appreciated. Thanks Faisal _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
