I think my problem has something to do with the parameters of the USRP. I now try to send a file modulated with DBPSK. So I build a graph File source -> Packet Encoder -> DPBSK MOD -> DPBSK DEMOD -> Packet Decoder -> File sink and i really get the correct output file. Here the grc: http://old.nabble.com/file/p29170637/top_block.py top_block.py If I put a USRP source and USRP sink into graph, I don't receive anything. Not even one byte. Here the grc: http://old.nabble.com/file/p29170637/top_block.py top_block.py I hope anyone can help me. Thanks
EsserIHF wrote: > > Yesterday I looked in this example. I let this example run with the > parameters "-m dbpsk -f 20000",so the example should do the modulation. > But on my scope, I still can't see a good modulated signal. Here is the > output: > http://old.nabble.com/file/p29169627/dbpsk.png dbpsk.png > Can someone explain to me why I didn't get the right output? Thank you > > > Tom Rondeau wrote: >> >> On Wed, Jul 14, 2010 at 7:20 AM, EsserIHF <[email protected]> >> wrote: >>> >>> Hi everyone, >>> I am trying to do a PSK-Modulation. For that i use the dpsk-block and >>> choose >>> dbpsk which should be the same as psk-modulation. I connect the USRP >>> with a >>> oscilloscope, but i didn't get the expected output. >>> I tried to set the input vector to 127,127...127 and 0,1,0,1.....0,1 but >>> i >>> either didn't get a good output. >>> Where is my mistake? Please help, thank you. >>> >>> http://old.nabble.com/file/p29160823/psk.grc psk.grc >>> >>> the output for the vector 0,1....0,1 is this: >>> >>> http://old.nabble.com/file/p29160823/tek0062.jpg tek0062.jpg >> >> >> Have you tried running benchmark_tx.py in >> gnuradio-examples/python/digital? >> >> You can use that as a reference for how to use the modulator. >> >> Tom >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> > > -- View this message in context: http://old.nabble.com/psk-modulation-tp29160823p29170637.html Sent from the GnuRadio mailing list archive at Nabble.com. _______________________________________________ Discuss-gnuradio mailing list [email protected] http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
