[Discuss-gnuradio] need help on transimit a band signal

[cbwangmail]

hi
 in grc,i have a problem,i want to trasimit a band signal with the grc 's block,but when i tansimitted it,there is something wrong with it.in the receiver,it is only a frequent point signal.so it indicate that the trasimitter is wrong.i guess the usrp sink do not do a goog work.so how can i do with the usrp sink to have a band sink. i am looking forward to your reply.

thanks!