Installed Gnuradio 3.7.2 from source. Had some troubles loading files
earlier versions so I started from scratch with the FM receiver from
2h20. Added a bandpass filter to filter the 19 kHz pilot tone (just for
fun) but want to add the waterfall sink to see / show 57 kHz RDS carrier
(also for fun / getting experience).
The waterfall sink only shows a blue screen. Tried different range
settings, different ref scale settings and FFT sizes. Stole the settings
from this example
no output. The waterfall also shows no scale information or labels.
Found another problem about this on the list where the question was what
happened if a signal source was connected to the waterfall sink without
anything else, I tried that also but even there only a blue screen is
filled but no signal and no labels and so on are showed.
The output window is here:
Thanks for any advice,