On Sat, Feb 26, 2011 at 5:17 AM, Jay Gaona <imion...@hotmail.com> wrote:
> Hello everyone, > > I've added a dual usrp sink block and duplicated the tx flow graphs in > benchmark_tx.py example. However, I am unable to transmit packets when I set > the following in the flow graph: > > self.packet_transmitter = \ > blks2.mod_pkts(modulator, > access_code=None, > msgq_limit=4, > pad_for_usrp=True) > > self.packet_transmitter_2 = \ > blks2.mod_pkts(modulator_2, > access_code=None, > msgq_limit=4, > pad_for_usrp=True) > > > self.connect(self.packet_transmitter, self.amp, (self, 0)) > self.connect(self.packet_transmitter_2, self.amp_2, (self, 1)) > > I have tried the following 2 codes and were able to transmit packets from > the first flow graph, and then the packets from the second flow graph: > > self.connect(self.packet_transmitter, self.amp, (self, 0)) > self.connect(self.null_source, self.amp_2, (self, 1)) > > self.connect(self.null_source, self.amp, (self, 0)) > self.connect(self.packet_transmitter_2, self.amp_2, (self, 1)) > > Any idea why I am unable to simultaneously transmit packets from both flow > graphs? Thanks in advance! > Right now, no, sorry, no ideas. It seems like it should work. I will suggest two things, though. First, remove the message sources from the graph. Replace your packet_transmitter_X and replace them with two gr.sig_source_c() with different frequencies and make sure that they transmit as expected from each output of the USRP. Next, keep your packet transmitters, but replace the USRP dual sink with file sinks and make sure they are getting the proper signals from the source. Between these two experiments, maybe you'll get enough information to fix your problem. Or let us know more about what's happening to be more help to you. Tom
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