[Discuss-gnuradio] RTLSDR, USRP issue with grc

[farid mihoub]

Hello,

If I am using usrp sink or source to transmit or receive separately  I got no signal.but if am using them on the same flow graph I got a signal, and this  

is the same issue with rtlsdr. (FFT sink GUI shows something around -120db).

rtlsdr works fine with gqrx.

 

Situation1: works fine if these blocks are in the same flow graph.

flow_graph1:

source---> usrp_sink

usrp_source(or rtlsdr)---->sink

 

Situation2: doesn't work

flow_graph2_1: in the same PC with tx/rx and rx2 mode, or on different PCs

source---> usrp_sink

flow_graph2_2:

usrp_source(or rtlsdr)---->sink

 

**tested on ubuntu 18.04.2 bionic, gnuradio 3.8, 3.7.12

 

Thank you.