[Discuss-gnuradio] a problem about the scope_sink in GRC

[intermilan]

hello all:
                 I am a newer to the Gnuradio. And recently I use USRP and GRC to make some examples. But I have a problem about the scope_sink in the GRC.
                there are some block which I used in my graph:
                signal_source->packet_encoder->Gmsk_mod->USRP_sink
               USRP_source->Gmsk_demod->packet_decoder->scope_sink
               When I run the graph, I can not see anythin in the scope_sink, which mean I can not see the demodulated waveform, can anyone tell me why this had happende? By the way,the USRP which I used is RFX2400 and works well.
 
                                                                                                                                Thank you very much and I apperciate the answer.

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