GRC problem

GNU Radio
1

hello all:

    I recently use GRC and USRP to do some experiment. But there is

a problem for me.

   I use signal_source->packet_encoder->Gmsk_mod->usrp_sink in the

transmit side.and it the receive side I use
usrp_source->Gmsk_demod->packet_decoder->scope_sink.Now I know I can see
the modulationed waveform in the scope_sink which is connected to the
usrp_source. But I can not see anything in the last scope_sink. The
correlative parameters which I set about the usrp_sink and usrp_source
are the same as the defulat value in the benchmark_tx.py and
benchmark_rx.py.and the other parameter in the other block is the defult
value.Can anyone tell me how to figure out this problem?

                                                                                                                     Thank

you

2

Your transmit amplitude is almost zero, try something around 10e3.

See the notes in the usrp source block.