Hi,
Installed Gnuradio 3.7.2 from source. Had some troubles loading files from earlier versions so I started from scratch with the FM receiver from author 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).
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.
Thanks for any advice,
Ben