F27 and F30):
hackrf, gr-osmosdr and gnuradio installed
export QT_X11_NO_MITSHM=1
line 70 should be a variable to control time scale on x-axis,
default is 100000 which corresponds to 30ms
line 117 needs correct hackrf serial number from hackrf_info output
line 119 needs correct frequency to receive on, default is 5180MHz
